2020 Chesapeake Bay SAV Coverage

+ Resource Description

Citation

Information used to reference the data.

Title: 2020 Chesapeake Bay SAV Coverage

Originators: Virginia Institute of Marine Science

Publication date: 20201202

Data type: vector digital data

Data location: https://www.vims.edu//sav

Description

A characterization of the data, including its intended use and limitations.

Abstract: The 2020 Chesapeake Bay SAV Coverage was mapped from digital multispectral imagery with a 25cm GSD to assess water quality in the Bay. WorldView 2 satellite imagery acquired from Digital Globe through the NGA NextView program was used to augment the aerial imagery for the Susquehanna Flats; the Gunpowder River; the Eastern Neck area of the Chester River; Aquia Creek and a middle section of the Potomac River; Anacostia River and northernmost area of the Potomac River; the New Point Comfort area of Mobjack Bay; and Nassawadox Creek, Hungars Creek, and Mattawoman Creek. Each area of SAV was interpreted from the rectified imagry and classified into one of four density classes by the percentage of cover. The SAV beds were entered into an SDE GIS fetaure class using the quality control procedures documented below. The dataset contains all SAV areas that were identified from the areas flown. Some areas that are presumed to contain no SAV were not flown. Some small beds, particularly along narrow tributaries may not have been distinguishable on the aerial photography.

Purpose: The annual SAV aerial photographic monitoring program provides a comprehensive and accurate measure of change in SAV relative abundance that has been used to link improving water quality to increases in bay living resources.

Dataset credit: SAV Ecology, Monitoring, & Restoration Program, Virginia Institute of Marine Science

Point Of Contact

Contact information for the individual or organization that is knowledgeable about the data.

Organization: Virginia Institute of Marine Science

Position: SAV Data Administrator

Phone: 804/684-7088

Email: savadmin@vims.edu

Address type: mailing and physical

Address: Rt. 1208, Greate RD

City: Gloucester Point

State or Province: VA

Postal code: 23062

Country: US

Data Type

How the data are represented, formatted and maintained by the data producing organization.

Data type: vector digital data

Native dataset environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.0.12790

Time Period of Data

Time period(s) for which the data corresponds to the currentness reference.

Beginning date: 20190529

Ending date: 20190922

Currentness reference: ground condition

Status

The state of and maintenance information for the data.

Data status: Complete

Update frequency: Irregular

Key Words

Words or phrases that summarize certain aspects of the data.

Theme:

Keywords: vegetative surface cover, submerged aquatic vegetation, SAV

Keyword thesaurus: None

Theme:

Keywords: biota, environment

Keyword thesaurus: ISO 19115 Topic Categories

Place:

Keywords: Chesapeake Bay, Chincoteague Bay

Keyword thesaurus: None

Place:

Keywords: VA, DE, MD

Keyword thesaurus: U.S. Postal State Abbreviations

Place:

Keywords: 51, 10, 24

Keyword thesaurus: U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of The United States, and associated areas (Federal Information Processing Standard 5-2):Washington ,D. C., National Institute of Standards and Technology.

Place:

Keywords: US

Keyword thesaurus: U.S. Department of Commerce, 1977, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions (Federal Information Processing Standard 10-3):Washington, D.C., National Institute of Standards and Technology.

Data Access Constraints

Restrictions and legal prerequisites for accessing or using the data after access is granted.

Access constraints: None

Use constraints: None

+ Spatial Reference Information

Horizontal Coordinate System

Reference system from which linear or angular quantities are measured and assigned to the position that a point occupies.

Coordinate System Details

Map projection

Map projection name: NAD 1983 UTM Zone 18N

Scale factor at central meridian: 0.9996

Longitude of central meridian: -75.0

Latitude of projection origin: 0.0

False easting: 500000.0

False northing: 0.0

Planar Coordinate Information

Planar coordinate encoding method: coordinate pair

Coordinate representation:

Abscissa resolution: 0.000000002220024164500956

Ordinate resolution: 0.000000002220024164500956

Planar distance units: meter

Geodetic model

Horizontal datum name: D North American 1983

Ellipsoid name: GRS 1980

Semi-major axis: 6378137.0

Denominator of flattening ratio: 298.257222101

Spatial Domain

The geographic areal domain of the data that describes the western, eastern, northern, and southern geographic limits of data coverage.

Bounding Coordinates

In Unprojected coordinates (geographic)

Boundary	Coordinate
West	-77.588763 (longitude)
East	-74.999616 (longitude)
North	39.756832 (latitude)
South	36.653889 (latitude)

+ Data Structure and Attribute Information

Overview

Summary of the information content of the data, including other references to complete descriptions of entity types, attributes, and attribute values for the data.

Direct spatial reference method: Vector

Attributes of beds20

Detailed descriptions of entity type, attributes, and attribute values for the data.

Description: VIMS

Source: VIMS - SAV Program

Attributes

Definition: U.S. State which contains the SAV bed

Attribute domain values

Value	Definition
MD	Maryland
MD	Definition Source: State Abbreviations
DC	Washington DC
DC	Definition Source: State Abbreviations
DE	Delaware
DE	Definition Source: State Abbreviations
VA	Virginia
VA	Definition Source: State Abbreviations

Attribute definition source: US State Abbreviations

BEDID

Definition: Two-letter SAV bed identifier.

Attribute values: Labels from "A" to "ZZ"

Attribute definition source: VIMS SAV

QUADID

Definition: Identification number of USGS quads that contains the SAV bed

Attribute domain values

Value	Definition
75	Nanticoke, MD.
75	Definition Source: VIMS SAV
36	Claiborne, MD.
36	Definition Source: VIMS SAV
88	Kinsale, VA.-MD.
88	Definition Source: VIMS SAV
74	Wingate, MD.
74	Definition Source: VIMS SAV
23	Round Bay, MD.
23	Definition Source: VIMS SAV
93	Marion, MD.
93	Definition Source: VIMS SAV
6	White Marsh, MD.
6	Definition Source: VIMS SAV
219	Bloxom, VA.
219	Definition Source: VIMS SAV
94	Mount Landing, VA.
94	Definition Source: VIMS SAV
27	Centreville, MD.
27	Definition Source: VIMS SAV
24	Gibson Island, MD.
24	Definition Source: VIMS SAV
120	Toano, VA.
120	Definition Source: VIMS SAV
106	Reedville, VA.
106	Definition Source: VIMS SAV
130	Clay Bank, VA.
130	Definition Source: VIMS SAV
142	Elliotts Creek, VA.
142	Definition Source: VIMS SAV
19	Sparrows Point, MD.
19	Definition Source: VIMS SAV
26	Langford Creek, MD.
26	Definition Source: VIMS SAV
184	Cobb Island, VA.
184	Definition Source: VIMS SAV
113	Nandua Creek, VA.
113	Definition Source: VIMS SAV
5	Elkton, MD.-DEL.
5	Definition Source: VIMS SAV
168	Ocean City, MD.
168	Definition Source: VIMS SAV
53	Cambridge, MD.
53	Definition Source: VIMS SAV
70	Hollywood, MD.
70	Definition Source: VIMS SAV
147	Hampton, VA.
147	Definition Source: VIMS SAV
46	Preston, MD.
46	Definition Source: VIMS SAV
165	Selbyville, MD.
165	Definition Source: VIMS SAV
218	Metompkin Inlet, VA.
218	Definition Source: VIMS SAV
134	Cheriton, VA.
134	Definition Source: VIMS SAV
22	Chestertown, MD.
22	Definition Source: VIMS SAV
99	Ewell, MD.-VA.
99	Definition Source: VIMS SAV
181	Bowie, MD.
181	Definition Source: VIMS SAV
160	Fowling Creek, MD.
160	Definition Source: VIMS SAV
131	Achilles, VA.
131	Definition Source: VIMS SAV
95	Tappahannock, VA.
95	Definition Source: VIMS SAV
61	Cove Point, MD.
61	Definition Source: VIMS SAV
55	Widewater, VA.-MD.
55	Definition Source: VIMS SAV
138	Hog Island, VA.
138	Definition Source: VIMS SAV
128	Norge, VA.
128	Definition Source: VIMS SAV
141	Poquoson East, VA.
141	Definition Source: VIMS SAV
102	Saxis, VA.-MD.
102	Definition Source: VIMS SAV
159	Bristol, MD.
159	Definition Source: VIMS SAV
220	Wallops Island, VA.
220	Definition Source: VIMS SAV
39	Fort Belvoir, VA.-MD.
39	Definition Source: VIMS SAV
42	North Beach, MD.
42	Definition Source: VIMS SAV
51	Hudson, MD.
51	Definition Source: VIMS SAV
129	Williamsburg, VA.
129	Definition Source: VIMS SAV
79	Piney Point, MD.-VA.
79	Definition Source: VIMS SAV
217	Accomax, VA.
217	Definition Source: VIMS SAV
56	Nanjemoy, MD.
56	Definition Source: VIMS SAV
66	Dahlgren, VA.-MD.
66	Definition Source: VIMS SAV
170	Tingles Island, MD.
170	Definition Source: VIMS SAV
107	Tangier Island, VA.
107	Definition Source: VIMS SAV
37	St. Michaels, MD.
37	Definition Source: VIMS SAV
85	Monie, MD.
85	Definition Source: VIMS SAV
15	Hanesville, MD.
15	Definition Source: VIMS SAV
192	Hobbs, MD.
192	Definition Source: VIMS SAV
136	Claremont, VA.
136	Definition Source: VIMS SAV
171	Girdle Tree, MD.-VA.
171	Definition Source: VIMS SAV
193	Church Hill, MD.
193	Definition Source: VIMS SAV
216	Wachapreague, VA.
216	Definition Source: VIMS SAV
235	Montross, VA.
235	Definition Source: VIMS SAV
121	Gressitt, VA.
121	Definition Source: VIMS SAV
143	Townsend, VA.
143	Definition Source: VIMS SAV
185	Suffolk, VA.
185	Definition Source: VIMS SAV
232	Wachapreague East, VA.
232	Definition Source: VIMS SAV
69	Leonardtown, MD.
69	Definition Source: VIMS SAV
189	Eden, MD.
189	Definition Source: VIMS SAV
82	Richland Point, MD.
82	Definition Source: VIMS SAV
188	Kingston, MD.
188	Definition Source: VIMS SAV
227	Truhart, VA.
227	Definition Source: VIMS SAV
180	Horseshoe Point, MD.
180	Definition Source: VIMS SAV
234	Snow Hill, MD.
234	Definition Source: VIMS SAV
135	Savedge, VA.
135	Definition Source: VIMS SAV
166	Assawoman Bay, MD.
166	Definition Source: VIMS SAV
126	Charles City, VA.
126	Definition Source: VIMS SAV
47	Quantico, VA.-MD.
47	Definition Source: VIMS SAV
233	Aylett, VA.
233	Definition Source: VIMS SAV
64	Passapatanzy, MD.-VA.
64	Definition Source: VIMS SAV
29	Washington East, D.C.-MD.
29	Definition Source: VIMS SAV
231	Port Royal, VA.
231	Definition Source: VIMS SAV
17	Galena, MD.
17	Definition Source: VIMS SAV
78	St. Clements Island, VA.-MD.
78	Definition Source: VIMS SAV
21	Rock Hall, MD.
21	Definition Source: VIMS SAV
77	Stratford Hall, VA.-MD.
77	Definition Source: VIMS SAV
223	Pleasant Ridge, VA.
223	Definition Source: VIMS SAV
8	Perryman, MD.
8	Definition Source: VIMS SAV
186	Fisherman's Island, VA.
186	Definition Source: VIMS SAV
60	Broomes Island, MD.
60	Definition Source: VIMS SAV
105	Lively, VA.
105	Definition Source: VIMS SAV
173	Whittington Point, MD.-VA.
173	Definition Source: VIMS SAV
199	Millington, MD.
199	Definition Source: VIMS SAV
155	Norfolk South, VA.
155	Definition Source: VIMS SAV
198	Hallwood, VA. - MD.
198	Definition Source: VIMS SAV
162	Charlotte Hall, MD.
162	Definition Source: VIMS SAV
203	Diputanta North, VA.
203	Definition Source: VIMS SAV
31	Annapolis, MD.
31	Definition Source: VIMS SAV
112	Fleets Bay, VA.
112	Definition Source: VIMS SAV
80	St. Mary's City, MD.
80	Definition Source: VIMS SAV
62	Taylors Island, MD.
62	Definition Source: VIMS SAV
108	Chesconessex, VA.
108	Definition Source: VIMS SAV
65	King George, VA.-MD.
65	Definition Source: VIMS SAV
206	Drewrys Bluff, VA.
206	Definition Source: VIMS SAV
109	Parksley, VA.
109	Definition Source: VIMS SAV
116	Saluda, VA.
116	Definition Source: VIMS SAV
172	Boxiron, MD.-VA.
172	Definition Source: VIMS SAV
182	Smith Point, VA.-MD.
182	Definition Source: VIMS SAV
40	Mt. Vernon, VA.-MD.
40	Definition Source: VIMS SAV
43	Tilghman, MD.
43	Definition Source: VIMS SAV
13	Middle River, MD.
13	Definition Source: VIMS SAV
90	Point Lookout, MD.
90	Definition Source: VIMS SAV
86	Champlain, VA.
86	Definition Source: VIMS SAV
212	Ship Shoal Inlet, VA.
212	Definition Source: VIMS SAV
208	Roxbury, VA.
208	Definition Source: VIMS SAV
92	Terrapin Sand Point, MD.
92	Definition Source: VIMS SAV
187	Exmore, VA.
187	Definition Source: VIMS SAV
103	Dunnsville, VA.
103	Definition Source: VIMS SAV
101	Crisfield, MD.-VA.
101	Definition Source: VIMS SAV
158	Wye Mills, MD.
158	Definition Source: VIMS SAV
34	Alexandria, VA.-D.C.-MD.
34	Definition Source: VIMS SAV
197	Haynesville, VA.
197	Definition Source: VIMS SAV
67	Colonial Beach North, VA.-MD.
67	Definition Source: VIMS SAV
91	Kedges Straits, MD.
91	Definition Source: VIMS SAV
204	Hopewell, VA.
204	Definition Source: VIMS SAV
1	Conowingo Dam, MD.-PA.
1	Definition Source: VIMS SAV
81	Point No Point, MD.
81	Definition Source: VIMS SAV
118	Deltaville, VA.
118	Definition Source: VIMS SAV
38	Easton, MD.
38	Definition Source: VIMS SAV
215	Quinbly Inlet, VA.
215	Definition Source: VIMS SAV
209	Providence Forge, VA.
209	Definition Source: VIMS SAV
87	Machodoc, VA.
87	Definition Source: VIMS SAV
190	Rhodesdale, MD.
190	Definition Source: VIMS SAV
167	Berlin, MD.
167	Definition Source: VIMS SAV
139	Yorktown, VA.
139	Definition Source: VIMS SAV
201	Loretto, VA.
201	Definition Source: VIMS SAV
132	New Point Comfort, VA.
132	Definition Source: VIMS SAV
137	Surry, VA.
137	Definition Source: VIMS SAV
83	Bloodsworth Island, MD.
83	Definition Source: VIMS SAV
114	Pungoteague, VA.
114	Definition Source: VIMS SAV
71	Solomons Island, MD.
71	Definition Source: VIMS SAV
214	Nassawadox, VA.
214	Definition Source: VIMS SAV
178	Bethel Beach, VA.
178	Definition Source: VIMS SAV
10	Earleville, MD.
10	Definition Source: VIMS SAV
117	Wilton, VA.
117	Definition Source: VIMS SAV
52	Church Creek, MD.
52	Definition Source: VIMS SAV
230	Manquin, VA.
230	Definition Source: VIMS SAV
213	Great Machipongo Inlet, VA.
213	Definition Source: VIMS SAV
4	North East, MD.
4	Definition Source: VIMS SAV
123	Mathews, VA.
123	Definition Source: VIMS SAV
98	Burgess, VA.-MD.
98	Definition Source: VIMS SAV
35	Deale, MD.
35	Definition Source: VIMS SAV
229	New Kent, VA.
229	Definition Source: VIMS SAV
54	East New Market, MD.
54	Definition Source: VIMS SAV
44	Oxford, MD.
44	Definition Source: VIMS SAV
148	Benns Church, VA.
148	Definition Source: VIMS SAV
196	Princess Anne, MD.
196	Definition Source: VIMS SAV
156	Kempsville, VA.
156	Definition Source: VIMS SAV
163	Mardela Springs, MD.
163	Definition Source: VIMS SAV
207	Dutch Gap, VA.
207	Definition Source: VIMS SAV
176	Anacostia, D.C.-MD.
176	Definition Source: VIMS SAV
175	Chincoteague East, VA.
175	Definition Source: VIMS SAV
2	Aberdeen, MD.
2	Definition Source: VIMS SAV
151	Little Creek, VA.
151	Definition Source: VIMS SAV
110	Urbanna, VA.
110	Definition Source: VIMS SAV
144	Bacons Castle, VA.
144	Definition Source: VIMS SAV
18	Curtis Bay, MD.
18	Definition Source: VIMS SAV
59	Mechanicsville, MD.
59	Definition Source: VIMS SAV
127	Brandon, VA.
127	Definition Source: VIMS SAV
195	Gloucester, VA.
195	Definition Source: VIMS SAV
3	Havre de Grace, MD.
3	Definition Source: VIMS SAV
228	Tunstall, VA.
228	Definition Source: VIMS SAV
211	Richmond, VA.
211	Definition Source: VIMS SAV
154	Bowers Hill, VA.
154	Definition Source: VIMS SAV
119	Jamesville, VA.
119	Definition Source: VIMS SAV
68	Rock Point, MD.
68	Definition Source: VIMS SAV
111	Irvington, VA.
111	Definition Source: VIMS SAV
149	Newport News South, VA.
149	Definition Source: VIMS SAV
12	Baltimore East, MD.
12	Definition Source: VIMS SAV
145	Mulberry Island, VA.
145	Definition Source: VIMS SAV
224	Creeds, VA.
224	Definition Source: VIMS SAV
146	Newport News North, VA.
146	Definition Source: VIMS SAV
200	Rollins Fork, VA.
200	Definition Source: VIMS SAV
202	Pocomoke City, MD. - VA.
202	Definition Source: VIMS SAV
174	Chincoteague West, VA.
174	Definition Source: VIMS SAV
41	Lower Marlboro, MD.
41	Definition Source: VIMS SAV
115	West Point, VA.
115	Definition Source: VIMS SAV
7	Edgewood, MD.
7	Definition Source: VIMS SAV
20	Swan Point, MD.
20	Definition Source: VIMS SAV
28	Washington West, MD.-D.C.-VA.
28	Definition Source: VIMS SAV
89	St. George Island, MD.-VA.
89	Definition Source: VIMS SAV
9	Spesutie, MD.
9	Definition Source: VIMS SAV
140	Poquoson West, VA.
140	Definition Source: VIMS SAV
11	Cecilton, MD.
11	Definition Source: VIMS SAV
133	Cape Charles, VA.
133	Definition Source: VIMS SAV
122	Ware Neck, VA.
122	Definition Source: VIMS SAV
161	Port Tobacco, MD.
161	Definition Source: VIMS SAV
210	Walkers, VA.
210	Definition Source: VIMS SAV
153	Chuckatuck, VA.
153	Definition Source: VIMS SAV
125	Westover, VA.
125	Definition Source: VIMS SAV
32	Kent Island, MD.
32	Definition Source: VIMS SAV
100	Great Fox Island, MD.-VA.
100	Definition Source: VIMS SAV
16	Betterton, MD.
16	Definition Source: VIMS SAV
73	Honga, MD.
73	Definition Source: VIMS SAV
150	Norfolk North, VA.
150	Definition Source: VIMS SAV
58	Popes Creek, MD.
58	Definition Source: VIMS SAV
226	King & Queen Courthouse, VA.
226	Definition Source: VIMS SAV
104	Morattico, VA.
104	Definition Source: VIMS SAV
183	East of Reedville, VA.
183	Definition Source: VIMS SAV
179	Goose Island, VA.
179	Definition Source: VIMS SAV
97	Heathsville, VA.-MD.
97	Definition Source: VIMS SAV
63	Golden Hill, MD.
63	Definition Source: VIMS SAV
50	Prince Frederick, MD.
50	Definition Source: VIMS SAV
152	Cape Henry, VA.
152	Definition Source: VIMS SAV
225	King William, VA.
225	Definition Source: VIMS SAV
45	Trappe, MD.
45	Definition Source: VIMS SAV
222	Fentress, VA.
222	Definition Source: VIMS SAV
194	Lancaster, VA.
194	Definition Source: VIMS SAV
72	Barren Island, MD.
72	Definition Source: VIMS SAV
49	Benedict, MD.
49	Definition Source: VIMS SAV
191	Sharptown, MD.
191	Definition Source: VIMS SAV
164	Wetipquin, MD.
164	Definition Source: VIMS SAV
84	Deal Island, MD.
84	Definition Source: VIMS SAV
221	Deep Creek, VA.
221	Definition Source: VIMS SAV
157	Princess Anne, VA.
157	Definition Source: VIMS SAV
169	Public Landing, MD.
169	Definition Source: VIMS SAV
57	Mathias Point, MD.-VA.
57	Definition Source: VIMS SAV
205	Chester, VA.
205	Definition Source: VIMS SAV
33	Queenstown, MD.
33	Definition Source: VIMS SAV
177	East of New Point, VA.
177	Definition Source: VIMS SAV
14	Gunpowder Neck, MD.
14	Definition Source: VIMS SAV
25	Love Point, MD.
25	Definition Source: VIMS SAV
30	South River, MD.
30	Definition Source: VIMS SAV
124	Franktown, VA.
124	Definition Source: VIMS SAV
48	Indian Head, MD.- VA.
48	Definition Source: VIMS SAV
76	Colonial Beach South, VA.-MD.
76	Definition Source: VIMS SAV
96	Lottsburg, VA.
96	Definition Source: VIMS SAV

Attribute definition source: 2009 Distribution of SAV in the Chesapeake Bay, Final Report to U.S. EPA, Chesapeake Bay Program

DENSITY

Definition: SAV bed density classification. A ZERO VALUE IN THIS FIELD SIGNIFIES A LAND AREA OR ANY OTHER NON-SAV AREA THAT IS COMPLETELY SURROUNDED BY SAV.THESE POLYGONS SHOULD BE EXCLUDED FROM SAV AREA COMPUTATIONS.

Attribute domain values

Value	Definition
3	40 - 70% cover (moderate)
3	Definition Source: VIMS SAV
0	No SAV
0	Definition Source: VIMS SAV
4	70 - 100% cover (dense)
4	Definition Source: VIMS SAV
2	10 - 40% cover (sparse)
2	Definition Source: VIMS SAV
1	0 - 10% cover (very sparse)
1	Definition Source: VIMS SAV

Attribute definition source: VIMS SAV

SHAPE

Definition: Feature geometry.

Attribute values: Coordinates defining the features.

Attribute definition source: ESRI

FID

Definition: Internal feature number.

Attribute values: Sequential unique whole numbers that are automatically generated.

Attribute definition source: ESRI

Surveyed

Definition: Indicates whether the polygon was covered by the annual survey.

Attribute domain values

Value	Definition
No	Not included in the area surveyed
No	Definition Source: VIMS
Yes	Included in the area surveyed
Yes	Definition Source: VIMS
P	Area was mapped at less than maximum biomass
P	Definition Source: VIMS

Attribute definition source: VIMS

SHAPE_STLe

CBPSEG

Definition: Chesapeake Bay Program Segment abbreviations ("AAWPH", "IOWPH", "SPXPH","CHNPH", and "SVCPH" have been added to identify the Delmarva coastal bays)

Attribute domain values

Value	Definition
FSBMH	Fishing Bay
FSBMH	Definition Source: EPA Bay Program
CHSOH	Middle Chester River
CHSOH	Definition Source: EPA Bay Program
MAGMH	Magothy River
MAGMH	Definition Source: EPA Bay Program
WBEMH	Western Branch of the Elizabeth River
WBEMH	Definition Source: EPA Bay Program
CHOTF	Upper Choptank River
CHOTF	Definition Source: EPA Bay Program
ELIPH	Lower Elizabeth River
ELIPH	Definition Source: EPA Bay Program
CHKOH	Chickahominy River
CHKOH	Definition Source: EPA Bay Program
PMKTF	Upper Pamunkey River
PMKTF	Definition Source: EPA Bay Program
GUNOH2	Gunpowder River Segment 2
GUNOH2	Definition Source: EPA Bay Program
RPPMH	Lower Rappahannock River
RPPMH	Definition Source: EPA Bay Program
WSTMH	West River
WSTMH	Definition Source: EPA Bay Program
PMKOH	Lower Pamunkey River
PMKOH	Definition Source: EPA Bay Program
BSHOH	Bush River
BSHOH	Definition Source: EPA Bay Program
HNGMH	Honga River
HNGMH	Definition Source: EPA Bay Program
AAWPH	Assawoman Bay
AAWPH	Definition Source: EPA Bay Program
SASOH1	Sassafras River Segment 1
SASOH1	Definition Source: EPA Bay Program
POCOH	Middle Pocomoke River
POCOH	Definition Source: EPA Bay Program
SVCPH	Southern Va. Coastal Bays
SVCPH	Definition Source: EPA Bay Program
PAXMH6	Lower Patuxent River Segment 6
PAXMH6	Definition Source: EPA Bay Program
POCMH	Lower Pocomoke River
POCMH	Definition Source: EPA Bay Program
MANMH1	Manokin River Segment 1
MANMH1	Definition Source: EPA Bay Program
CB4MH	Middle Central Chesapeake Bay
CB4MH	Definition Source: EPA Bay Program
PAXMH1	Lower Patuxent River Segment 1
PAXMH1	Definition Source: EPA Bay Program
IOWPH	Isle of Wight Bay
IOWPH	Definition Source: EPA Bay Program
MPNTF	Upper Mattaponi River
MPNTF	Definition Source: EPA Bay Program
TANMH1	Tangier Sound Segment 1
TANMH1	Definition Source: EPA Bay Program
BOHOH	Bohemia River
BOHOH	Definition Source: EPA Bay Program
CB5MH	Lower Central Chesapeake Bay
CB5MH	Definition Source: EPA Bay Program
CHNPH	Chincoteague Bay
CHNPH	Definition Source: EPA Bay Program
CB1TF1	Northern Chesapeake Bay Segment 1
CB1TF1	Definition Source: EPA Bay Program
ELKOH1	Elk River Segment 1
ELKOH1	Definition Source: EPA Bay Program
SPXPH	Sinepuxent Bay
SPXPH	Definition Source: EPA Bay Program
JMSMH	Lower James River
JMSMH	Definition Source: EPA Bay Program
ELKOH2	Elk River Segment 2
ELKOH2	Definition Source: EPA Bay Program
PAXOH	Middle Patuxent River
PAXOH	Definition Source: EPA Bay Program
MATTF	Mattawoman Creek
MATTF	Definition Source: EPA Bay Program
POTOH3	Middle Potomac River Segment 3
POTOH3	Definition Source: EPA Bay Program
PAXMH3	Lower Patuxent River Segment 3
PAXMH3	Definition Source: EPA Bay Program
POTOH2	Middle Potomac River Segment 2
POTOH2	Definition Source: EPA Bay Program
RPPTF	Upper Rappahannock River
RPPTF	Definition Source: EPA Bay Program
PISTF	Piscataway Creek
PISTF	Definition Source: EPA Bay Program
BACOH	Back River
BACOH	Definition Source: EPA Bay Program
CRRMH	Corrotoman River
CRRMH	Definition Source: EPA Bay Program
PATMH	Patapsco River
PATMH	Definition Source: EPA Bay Program
ANATF	Anacostia River
ANATF	Definition Source: EPA Bay Program
JMSPH	Mouth of the James River
JMSPH	Definition Source: EPA Bay Program
EBEMH	Eastern Branch of the Elizabeth River
EBEMH	Definition Source: EPA Bay Program
C&DOH	Chesapeake & Delaware Canal
C&DOH	Definition Source: EPA Bay Program
POCTF	Upper Pocomoke River
POCTF	Definition Source: EPA Bay Program
CB2OH	Upper Chesapeake Bay
CB2OH	Definition Source: EPA Bay Program
CB7PH	Eastern Lower Chesapeake Bay
CB7PH	Definition Source: EPA Bay Program
POTOH1	Middle Potomac River Segment 1
POTOH1	Definition Source: EPA Bay Program
RHDMH	Rhode River
RHDMH	Definition Source: EPA Bay Program
PAXTF	Upper Patuxent River
PAXTF	Definition Source: EPA Bay Program
LCHMH	Little Choptank River
LCHMH	Definition Source: EPA Bay Program
MPNOH	Lower Mattaponi River
MPNOH	Definition Source: EPA Bay Program
CHOMH2	Lower Choptank River
CHOMH2	Definition Source: EPA Bay Program
LAFMH	Lafayette River
LAFMH	Definition Source: EPA Bay Program
TANMH2	Tangier Sound Segment 2
TANMH2	Definition Source: EPA Bay Program
WBRTF	Western Branch of the Patuxent River
WBRTF	Definition Source: EPA Bay Program
LYNPH	Lynnhaven & Broad Bays
LYNPH	Definition Source: EPA Bay Program
GUNOH1	Gunpowder River Segment 1
GUNOH1	Definition Source: EPA Bay Program
YRKMH	Middle York River
YRKMH	Definition Source: EPA Bay Program
PIAMH	Piankatank River
PIAMH	Definition Source: EPA Bay Program
CHOMH1	Mouth of the Choptank River
CHOMH1	Definition Source: EPA Bay Program
CB3MH	Upper Central Chesapeake Bay
CB3MH	Definition Source: EPA Bay Program
SASOH2	Sassafras River Segment 2
SASOH2	Definition Source: EPA Bay Program
CB8PH	Mouth of the Chesapeake Bay
CB8PH	Definition Source: EPA Bay Program
POTTF	Upper Potomac River
POTTF	Definition Source: EPA Bay Program
SEVMH	Severn River
SEVMH	Definition Source: EPA Bay Program
YRKPH	Lower York River
YRKPH	Definition Source: EPA Bay Program
CB1TF2	Northern Chesapeake Bay Segment 2
CB1TF2	Definition Source: EPA Bay Program
MIDOH	Middle River
MIDOH	Definition Source: EPA Bay Program
CB6PH	Western Lower Chesapeake Bay
CB6PH	Definition Source: EPA Bay Program
MANMH2	Manokin River Segment 2
MANMH2	Definition Source: EPA Bay Program
APPTF	Appomattox River
APPTF	Definition Source: EPA Bay Program
MOBPH	Mobjack Bay
MOBPH	Definition Source: EPA Bay Program
JMSTF2	Upper James River Segment 2
JMSTF2	Definition Source: EPA Bay Program
RPPOH	Middle Rappahannock River
RPPOH	Definition Source: EPA Bay Program
PAXMH5	Lower Patuxent River Segment 5
PAXMH5	Definition Source: EPA Bay Program
CHSMH	Lower Chester River
CHSMH	Definition Source: EPA Bay Program
NANOH	Middle Nanticoke River
NANOH	Definition Source: EPA Bay Program
CHOOH	Middle Choptank River
CHOOH	Definition Source: EPA Bay Program
WICMH	Wicomico River
WICMH	Definition Source: EPA Bay Program
JMSOH	Middle James River
JMSOH	Definition Source: EPA Bay Program
JMSTF1	Upper James River Segment 1
JMSTF1	Definition Source: EPA Bay Program
PAXMH2	Lower Patuxent River Segment 2
PAXMH2	Definition Source: EPA Bay Program
POTMH	Lower Potomac River
POTMH	Definition Source: EPA Bay Program
SOUMH	South River
SOUMH	Definition Source: EPA Bay Program
PAXMH4	Lower Patuxent River Segment 4
PAXMH4	Definition Source: EPA Bay Program
BIGMH1	Big Annemessex River Segment 1
BIGMH1	Definition Source: EPA Bay Program
EASMH	Eastern Bay
EASMH	Definition Source: EPA Bay Program
SBEMH	South Branch of the Elizabeth River
SBEMH	Definition Source: EPA Bay Program
CHSTF	Upper Chester River
CHSTF	Definition Source: EPA Bay Program
NORTF	Northeast River
NORTF	Definition Source: EPA Bay Program
BIGMH2	Big Annemessex River Segment 2
BIGMH2	Definition Source: EPA Bay Program
NANTF	Upper Nanticoke River
NANTF	Definition Source: EPA Bay Program
NANMH	Lower Nanticoke River
NANMH	Definition Source: EPA Bay Program

Attribute definition source: Chesapeake Bay Program

BEDLABEL

Definition: The BedID and Density combined

Attribute values: A two-letter label and single digit density

Attribute definition source: VIMS SAV

ZONE_

Definition: Chesapeake Bay Program Zone

Attribute domain values

Value	Definition
3	RPPMH, CRRMH, RPPOH, RPPTF, PIAMH, CB6PH, CB7PH, MOBPH, YRKMH, YRKPH, MPNOH, MPNTF, PMKOH, PMKTF, JMSPH, ELIPH, SBEMH, JMSMH, JMSOH, CHKOH, JMSTF1, JMSTF2, APPTF, LYNPH, CB8PH (Lower Bay)
3	Definition Source: VIMS SAV
2	SEVMH, SOUMH, RHDMH, WSTMH, EASMH, CB4MH, CHOMH1, CHOMH2, CHOOH, CHOTF, LCHMH, PAXMH1, PAXMH2, PAXMH3, PAXMH4, PAXMH5, PAXMH6, PAXOH, PAXTF, HNGMH, FSBMH, NANMH, NANOH, NANTF, WICMH, MANMH1, MANMH2, BIGMH1, BIGMH2, POCMH, POCOH, POCTF, TANMH1, TANMH2, POTMH, POTOH1, POTOH2, POTOH3, POTTF, MATTF, PISTF, CB5MH (Middle Bay)
2	Definition Source: VIMS SAV
4	AAWPH, CHNPH, IOWPH, SPXPH, SVCPH (Delmarva Peninsula Coastal Bays)
4	Definition Source: VIMS SAV
1	CB1TF1,CB1TF2, NORTF, ELKOH1, ELK0H2, C&DOH, BOHOH, SASOH1, SAVOH2, CB2OH, CB3MH, BSHOH, GUNOH1, GUNOH2, MIDOH, BACOH, PATMH,CHSMH, CHSOH, CHSTF, MAGMH (Upper Bay)
1	Definition Source: VIMS SAV

Attribute definition source: VIMS SAV

SHAPE_STAr

SDTS Feature Description

Description of point and vector spatial objects in the data using the Spatial Data Transfer Standards (SDTS) terminology.

Spatial data transfer standard (SDTS) terms

Feature class

Type: GT-polygon composed of chains

Count: 7005

+ Data Quality and Accuracy Information

General

Information about the fidelity of relationships, data quality and accuracy tests, omissions, selection criteria, generalization, and definitions used to derive the data.

Logical consistency report: The GIS data has been cross-checked against data tables and ground observations.

Completeness report: The dataset contains all SAV areas that were identified from the areas flown. Some areas that are presumed to contain no SAV were not flown. Some small beds, particularly along narrow tributaries may not have been distinguishable on the aerial photography. Turbid conditions and poor weather conditions in 2019 prevented us from mapping the northern portion of the Delmarva Peninsula Coastal Bays zone, including Chincoteague, Sinepuxent, Isle of Wight, and Assawoman bays, representing 3,641 ha of SAV in 2017 (8,996 ac, 55% of the zone total).

Attribute Accuracy

Accuracy of the identification of data entities, features and assignment of attribute values.

Attribute accuracy report: The density attribute for all beds has been reviewed by an experienced photo-interpreter for correctness and consistency with analysis for prior years.

Attribute accuracy assessment:

Accuracy values

(value unknown)

Explanation: The density attribute for all beds has been reviewed by an experienced photo-interpreter for correctness and consistency with analysis for prior years.

Positional Accuracy

Accuracy of the positional aspects of the data.

Horizontal accuracy report: Horizontal positional accuracy is based upon orthorectification of scanned aerial photography using USGS digital orthothophoto quadrangles for horizontal control and USGS 30m DEM data as vertical control. Horizontal RMSE for individual flightlines was held to less than four meters.

Horizontal positional accuracy assessment:

Accuracy values

(value unknown)

Explanation: Horizontal positional accuracy of the imagery is evaluated as part of the orthorectification process throught the use of at least one check point for every two frames.

+ Data Source and Process Information

Data Sources

Information about the source data used to construct or derive the data.

Data source information

2020 SAV Aerial imagery

Title: 2020 SAV Aerial imagery

Originators: Airphotographics Inc

Publication date: 20201009

Data type: document

Map scale denominator: 24000

Media: None

Source contribution: 2020 SAV Aerial multispectral digital imagery Digital images 5/13/2020 - 10/9/2020

New 2004 Chesapeake Bay Program Segments adjusted to include land areas

Title: New 2004 Chesapeake Bay Program Segments adjusted to include land areas

Originators: Virginia Institute of Marine Science

Publication date: 20081006

Data type: map

Media: None

Source contribution: New 2004 Chesapeake Bay Program Segments adjusted to include land areas

2020 Auxiliary Imagery

Title: 2020 Auxiliary Imagery

Media: satellite

Source contribution: GeoEye 1, WorldView 2 and WorldView 3 satellite imagery acquired from Digital Globe through the NGA NextView program,

State boundaries adjusted to include shore areas

Title: State boundaries adjusted to include shore areas

Originators: Virginia Instute of Marine Science

Publication date: 20081006

Data type: map

Media: None

Source contribution: State boundaries adjusted to include shore areas

2020 SAV Orthophoto Mosaics

Title: 2020 SAV Orthophoto Mosaics

Originators: Virginia Institute of Marine Science

Publication date: 20190922

Data type: document

Map scale denominator: 24000

Media: None

Source contribution: 2020 SAV Orthophoto Mosaics Datasets 5/13/2019 - 10/9/2019

Process Steps

Information about events, parameters, tolerances and techniques applied to construct or derive the data.

Process step information

Process Step 1

Process description: Digital imagery is georectified and orthographically corrected to produce a seamless series of aerial mosaics following the standard operating procedures (SOP). ERDAS IMAGINE Photogrammetry image processing software is used to orthographically correct the individual flight lines using a bundle block solution. Camera lens calibration data is matched to the image location of fiducial points to define the interior camera model. Control points from USGS DOQQ images, National Agriculture Imagery Program (NAIP), Virginia Base Mapping Program (VBMP), MD Six Inch, and ESRI World imagery provide the exterior control, which is enhanced by a large number of image-matching tie points produced automatically by the software when IMU data were not available. The exterior and interior models are combined with a 10-meter resolution digital elevation model (DEM) from the USGS National Elevation Dataset (NED) to produce an orthophoto for each aerial photograph. The orthophotographs area combined into mosaic datasets for each flightline which are then combined into a single Bay-wide mosaic dataset.

Process date: 20200428

Process Step 2

Process description: The state boundaries were overlayed on the dataset by VIMS staff, dividing any beds that fell into multiple states.

Process date: 20201202

Process Step 3

Process description: The bay segments were overlayed on the dataset by VIMS staff, dividing any beds that fell into multiple segments.

Process date: 20201202

Process Step 4

Process description: The SAV beds are interpreted on-screen from the orthophoto mosaics using ESRI ArcGIS software. The identification and delineation of SAV beds by photo interpretation utilizes all available information including: knowledge of aquatic grass signatures on film, distribution of SAV in 2020 from aerial imagery, 2020 ground survey information, and aerial site surveys. National Agricultural Imagery Program (NAIP) aerial imagery, as well as WorldView 2 and 3 satellite imagery acquired from Digital Globe through the NGA NextView program, WorldView 4 imagery purchased from Apollo Mapping, and PlanetScope satellite imagery from Planet Labs was used to augment the aerial imagery in portions of the Bay and tributaries where imagery had not been acquired because of highly turbid water, weather, and security restrictions during the acquisition phase. In addition to delineating SAV bed boundaries, an estimate of SAV density within each bed was made by visually comparing each bed to an enlarged crown density scale similar to those developed for estimating crown cover of forest trees from aerial photography (Paine, 1981). Bed density was categorized into one of four classes based on a subjective comparison with the density scale. These were: 1, very sparse (<10% coverage); 2, sparse (10-40%); 3, moderate (40-70%); or 4, dense (70-100%). Either the entire bed or subsections within the bed were assigned a bed density number (1 to 4) corresponding to the above density classes. Some beds were subsectioned to delineate variations of SAV density. Additionally, each distinct SAV bed or bed subsection was assigned an identifying one or two letter designation unique to its map. Coupled with the appropriate SAV quadrangle number and year of photography, these letter designations uniquely identify each SAV bed in the database.

Process date: 20211203

+ Metadata Reference

Metadata Date

Dates associated with creating, updating and reviewing the metadata.

Last updated: 20211216

Metadata Point of Contact

Contact information for the individual or organization responsible for the metadata information.

Organization: Virginia Institute of Marine Science

Position: SAV Data Administrator

Phone: 804/684-7088

Email: savadmin@vims.edu

Address type: mailing and physical

Address: Rt. 1208 Greate Rd.

City: Gloucester Point

State or Province: VA

Postal code: 32061

Country: US

Metadata Standards

Description of the metadata standard used to document the data and reference to any additional extended profiles to the standard used by the metadata producer.

Standard name: FGDC Content Standard for Digital Geospatial Metadata

Standard version: FGDC-STD-001-1998

Time convention: local time

FGDC Plus Metadata Stylesheet

Stylesheet: FGDC Plus Stylesheet

File name: FGDC Plus.xsl

Version: 2.3

Description: This metadata is displayed using the FGDC Plus Stylesheet, which is an XSL template that can be used with ArcGIS software to display metadata. It displays metadata elements defined in the Content Standard for Digital Geospatial Metadata (CSDGM) - aka FGDC Standard, the ESRI Profile of CSDGM, the Biological Data Profile of CSDGM, and the Shoreline Data Profile of CSDGM. CSDGM is the US Federal Metadata standard. The Federal Geographic Data Committee originally adopted the CSDGM in 1994 and revised it in 1998. According to Executive Order 12096 all Federal agencies are ordered to use this standard to document geospatial data created as of January, 1995. The standard is often referred to as the FGDC Metadata Standard and has been implemented beyond the federal level with State and local governments adopting the metadata standard as well. The Biological Data Profile broadens the application of the CSDGM so that it is more easily applied to biological data that are not explicitly geographic (laboratory results, field notes, specimen collections, research reports) but can be associated with a geographic location. Includes taxonomical vocabulary. The Shoreline Data Profile addresses variability in the definition and mapping of shorelines by providing a standardized set of terms and data elements required to support metadata for shoreline and coastal data sets. The FGDC Plus Stylesheet includes the Dublin Core Metadata Element Set. It supports W3C DOM compatible browsers such as IE7, IE6, Netscape 7, and Mozilla Firefox. It is in the public domain and may be freely used, modified, and redistributed. It is provided "AS-IS" without warranty or technical support.

Instructions: On the top of the page, click on the title of the dataset to toggle opening and closing of all metadata content sections or click section links listed horizontally below the title to open individual sections. Click on a section name (e.g. Description) to open and close section content. Within a section, click on a item name (Status, Key Words, etc.) to open and close individual content items. By default, the Citation information within the Description section is always open for display.

Download: FGDC Plus Stylesheet is available from the ArcScripts downloads at www.esri.com.