20190212 13324900 1.0 FALSE VA_savDensity_2010_2021_merged_wm 002 18.373 -8623265.179800 -8378132.109900 4424180.459700 4709312.443900 1 Projected GCS_WGS_1984 WGS_1984_Web_Mercator_Auxiliary_Sphere <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.1.0'><WKT>PROJCS[&quot;WGS_1984_Web_Mercator_Auxiliary_Sphere&quot;,GEOGCS[&quot;GCS_WGS_1984&quot;,DATUM[&quot;D_WGS_1984&quot;,SPHEROID[&quot;WGS_1984&quot;,6378137.0,298.257223563]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Mercator_Auxiliary_Sphere&quot;],PARAMETER[&quot;False_Easting&quot;,0.0],PARAMETER[&quot;False_Northing&quot;,0.0],PARAMETER[&quot;Central_Meridian&quot;,0.0],PARAMETER[&quot;Standard_Parallel_1&quot;,0.0],PARAMETER[&quot;Auxiliary_Sphere_Type&quot;,0.0],UNIT[&quot;Meter&quot;,1.0],AUTHORITY[&quot;EPSG&quot;,3857]]</WKT><XOrigin>-20037700</XOrigin><YOrigin>-30241100</YOrigin><XYScale>10000</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>102100</WKID><LatestWKID>3857</LatestWKID></ProjectedCoordinateSystem> Linear Unit: Meter (1.000000) 20230908 11461200 20230908 11461200 FGDC FGDC CSDGM Metadata Simple FALSE 0 TRUE FALSE VA_savDensity_2010_2021_merged_wm Feature Class 0 VIMS VIMS - SAV Program OBJECTID OBJECTID OID 4 0 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. SHAPE Shape Geometry 0 0 0 Feature geometry. ESRI Coordinates defining the features. QUADID QUADID Integer 4 0 0 Identification number of USGS quads that contains the SAV bed 2009 Distribution of SAV in the Chesapeake Bay, Final Report to U.S. EPA, Chesapeake Bay Program 1 Conowingo Dam, MD.-PA. VIMS SAV 2 Aberdeen, MD. VIMS SAV 3 Havre de Grace, MD. VIMS SAV 4 North East, MD. VIMS SAV 5 Elkton, MD.-DEL. VIMS SAV 6 White Marsh, MD. VIMS SAV 7 Edgewood, MD. VIMS SAV 8 Perryman, MD. VIMS SAV 9 Spesutie, MD. VIMS SAV 10 Earleville, MD. VIMS SAV 11 Cecilton, MD. VIMS SAV 12 Baltimore East, MD. VIMS SAV 13 Middle River, MD. VIMS SAV 14 Gunpowder Neck, MD. VIMS SAV 15 Hanesville, MD. VIMS SAV 16 Betterton, MD. VIMS SAV 17 Galena, MD. VIMS SAV 18 Curtis Bay, MD. VIMS SAV 19 Sparrows Point, MD. VIMS SAV 20 Swan Point, MD. VIMS SAV 21 Rock Hall, MD. VIMS SAV 22 Chestertown, MD. VIMS SAV 23 Round Bay, MD. VIMS SAV 24 Gibson Island, MD. VIMS SAV 25 Love Point, MD. VIMS SAV 26 Langford Creek, MD. VIMS SAV 27 Centreville, MD. VIMS SAV 28 Washington West, MD.-D.C.-VA. VIMS SAV 29 Washington East, D.C.-MD. VIMS SAV 30 South River, MD. VIMS SAV 31 Annapolis, MD. VIMS SAV 32 Kent Island, MD. VIMS SAV 33 Queenstown, MD. VIMS SAV 34 Alexandria, VA.-D.C.-MD. VIMS SAV 35 Deale, MD. VIMS SAV 36 Claiborne, MD. VIMS SAV 37 St. Michaels, MD. VIMS SAV 38 Easton, MD. VIMS SAV 39 Fort Belvoir, VA.-MD. VIMS SAV 40 Mt. Vernon, VA.-MD. VIMS SAV 41 Lower Marlboro, MD. VIMS SAV 42 North Beach, MD. VIMS SAV 43 Tilghman, MD. VIMS SAV 44 Oxford, MD. VIMS SAV 45 Trappe, MD. VIMS SAV 46 Preston, MD. VIMS SAV 47 Quantico, VA.-MD. VIMS SAV 48 Indian Head, MD.- VA. VIMS SAV 49 Benedict, MD. VIMS SAV 50 Prince Frederick, MD. VIMS SAV 51 Hudson, MD. VIMS SAV 52 Church Creek, MD. VIMS SAV 53 Cambridge, MD. VIMS SAV 54 East New Market, MD. VIMS SAV 55 Widewater, VA.-MD. VIMS SAV 56 Nanjemoy, MD. VIMS SAV 57 Mathias Point, MD.-VA. VIMS SAV 58 Popes Creek, MD. VIMS SAV 59 Mechanicsville, MD. VIMS SAV 60 Broomes Island, MD. VIMS SAV 61 Cove Point, MD. VIMS SAV 62 Taylors Island, MD. VIMS SAV 63 Golden Hill, MD. VIMS SAV 64 Passapatanzy, MD.-VA. VIMS SAV 65 King George, VA.-MD. VIMS SAV 66 Dahlgren, VA.-MD. VIMS SAV 67 Colonial Beach North, VA.-MD. VIMS SAV 68 Rock Point, MD. VIMS SAV 69 Leonardtown, MD. VIMS SAV 70 Hollywood, MD. VIMS SAV 71 Solomons Island, MD. VIMS SAV 72 Barren Island, MD. VIMS SAV 73 Honga, MD. VIMS SAV 74 Wingate, MD. VIMS SAV 75 Nanticoke, MD. VIMS SAV 76 Colonial Beach South, VA.-MD. VIMS SAV 77 Stratford Hall, VA.-MD. VIMS SAV 78 St. Clements Island, VA.-MD. VIMS SAV 79 Piney Point, MD.-VA. VIMS SAV 80 St. Mary's City, MD. VIMS SAV 81 Point No Point, MD. VIMS SAV 82 Richland Point, MD. VIMS SAV 83 Bloodsworth Island, MD. VIMS SAV 84 Deal Island, MD. VIMS SAV 85 Monie, MD. VIMS SAV 86 Champlain, VA. VIMS SAV 87 Machodoc, VA. VIMS SAV 88 Kinsale, VA.-MD. VIMS SAV 89 St. George Island, MD.-VA. VIMS SAV 90 Point Lookout, MD. VIMS SAV 91 Kedges Straits, MD. VIMS SAV 92 Terrapin Sand Point, MD. VIMS SAV 93 Marion, MD. VIMS SAV 94 Mount Landing, VA. VIMS SAV 95 Tappahannock, VA. VIMS SAV 96 Lottsburg, VA. VIMS SAV 97 Heathsville, VA.-MD. VIMS SAV 98 Burgess, VA.-MD. VIMS SAV 99 Ewell, MD.-VA. VIMS SAV 100 Great Fox Island, MD.-VA. VIMS SAV 101 Crisfield, MD.-VA. VIMS SAV 102 Saxis, VA.-MD. VIMS SAV 103 Dunnsville, VA. VIMS SAV 104 Morattico, VA. VIMS SAV 105 Lively, VA. VIMS SAV 106 Reedville, VA. VIMS SAV 107 Tangier Island, VA. VIMS SAV 108 Chesconessex, VA. VIMS SAV 109 Parksley, VA. VIMS SAV 110 Urbanna, VA. VIMS SAV 111 Irvington, VA. VIMS SAV 112 Fleets Bay, VA. VIMS SAV 113 Nandua Creek, VA. VIMS SAV 114 Pungoteague, VA. VIMS SAV 115 West Point, VA. VIMS SAV 116 Saluda, VA. VIMS SAV 117 Wilton, VA. VIMS SAV 118 Deltaville, VA. VIMS SAV 119 Jamesville, VA. VIMS SAV 120 Toano, VA. VIMS SAV 121 Gressitt, VA. VIMS SAV 122 Ware Neck, VA. VIMS SAV 123 Mathews, VA. VIMS SAV 124 Franktown, VA. VIMS SAV 125 Westover, VA. VIMS SAV 126 Charles City, VA. VIMS SAV 127 Brandon, VA. VIMS SAV 128 Norge, VA. VIMS SAV 129 Williamsburg, VA. VIMS SAV 130 Clay Bank, VA. VIMS SAV 131 Achilles, VA. VIMS SAV 132 New Point Comfort, VA. VIMS SAV 133 Cape Charles, VA. VIMS SAV 134 Cheriton, VA. VIMS SAV 135 Savedge, VA. VIMS SAV 136 Claremont, VA. VIMS SAV 137 Surry, VA. VIMS SAV 138 Hog Island, VA. VIMS SAV 139 Yorktown, VA. VIMS SAV 140 Poquoson West, VA. VIMS SAV 141 Poquoson East, VA. VIMS SAV 142 Elliotts Creek, VA. VIMS SAV 143 Townsend, VA. VIMS SAV 144 Bacons Castle, VA. VIMS SAV 145 Mulberry Island, VA. VIMS SAV 146 Newport News North, VA. VIMS SAV 147 Hampton, VA. VIMS SAV 148 Benns Church, VA. VIMS SAV 149 Newport News South, VA. VIMS SAV 150 Norfolk North, VA. VIMS SAV 151 Little Creek, VA. VIMS SAV 152 Cape Henry, VA. VIMS SAV 153 Chuckatuck, VA. VIMS SAV 154 Bowers Hill, VA. VIMS SAV 155 Norfolk South, VA. VIMS SAV 156 Kempsville, VA. VIMS SAV 157 Princess Anne, VA. VIMS SAV 158 Wye Mills, MD. VIMS SAV 159 Bristol, MD. VIMS SAV 160 Fowling Creek, MD. VIMS SAV 161 Port Tobacco, MD. VIMS SAV 162 Charlotte Hall, MD. VIMS SAV 163 Mardela Springs, MD. VIMS SAV 164 Wetipquin, MD. VIMS SAV 165 Selbyville, MD. VIMS SAV 166 Assawoman Bay, MD. VIMS SAV 167 Berlin, MD. VIMS SAV 168 Ocean City, MD. VIMS SAV 169 Public Landing, MD. VIMS SAV 170 Tingles Island, MD. VIMS SAV 171 Girdle Tree, MD.-VA. VIMS SAV 172 Boxiron, MD.-VA. VIMS SAV 173 Whittington Point, MD.-VA. VIMS SAV 174 Chincoteague West, VA. VIMS SAV 175 Chincoteague East, VA. VIMS SAV 176 Anacostia, D.C.-MD. VIMS SAV 177 East of New Point, VA. VIMS SAV 178 Bethel Beach, VA. VIMS SAV 179 Goose Island, VA. VIMS SAV 180 Horseshoe Point, MD. VIMS SAV 181 Bowie, MD. VIMS SAV 182 Smith Point, VA.-MD. VIMS SAV 183 East of Reedville, VA. VIMS SAV 184 Cobb Island, VA. VIMS SAV 185 Suffolk, VA. VIMS SAV 186 Fisherman's Island, VA. VIMS SAV 187 Exmore, VA. VIMS SAV 188 Kingston, MD. VIMS SAV 189 Eden, MD. VIMS SAV 190 Rhodesdale, MD. VIMS SAV 191 Sharptown, MD. VIMS SAV 192 Hobbs, MD. VIMS SAV 193 Church Hill, MD. VIMS SAV 194 Lancaster, VA. VIMS SAV 195 Gloucester, VA. VIMS SAV 196 Princess Anne, MD. VIMS SAV 197 Haynesville, VA. VIMS SAV 198 Hallwood, VA. - MD. VIMS SAV 199 Millington, MD. VIMS SAV 200 Rollins Fork, VA. VIMS SAV 201 Loretto, VA. VIMS SAV 202 Pocomoke City, MD. - VA. VIMS SAV 203 Diputanta North, VA. VIMS SAV 204 Hopewell, VA. VIMS SAV 205 Chester, VA. VIMS SAV 206 Drewrys Bluff, VA. VIMS SAV 207 Dutch Gap, VA. VIMS SAV 208 Roxbury, VA. VIMS SAV 209 Providence Forge, VA. VIMS SAV 210 Walkers, VA. VIMS SAV 211 Richmond, VA. VIMS SAV 212 Ship Shoal Inlet, VA. VIMS SAV 213 Great Machipongo Inlet, VA. VIMS SAV 214 Nassawadox, VA. VIMS SAV 215 Quinbly Inlet, VA. VIMS SAV 216 Wachapreague, VA. VIMS SAV 217 Accomax, VA. VIMS SAV 218 Metompkin Inlet, VA. VIMS SAV 219 Bloxom, VA. VIMS SAV 220 Wallops Island, VA. VIMS SAV 221 Deep Creek, VA. VIMS SAV 222 Fentress, VA. VIMS SAV 223 Pleasant Ridge, VA. VIMS SAV 224 Creeds, VA. VIMS SAV 225 King William, VA. VIMS SAV 226 King & Queen Courthouse, VA. VIMS SAV 227 Truhart, VA. VIMS SAV 228 Tunstall, VA. VIMS SAV 229 New Kent, VA. VIMS SAV 230 Manquin, VA. VIMS SAV 231 Port Royal, VA. VIMS SAV 232 Wachapreague East, VA. VIMS SAV 233 Aylett, VA. VIMS SAV 234 Snow Hill, MD. VIMS SAV 235 Montross, VA. VIMS SAV BEDID BEDID String 2 0 0 Two-letter SAV bed identifier. VIMS SAV Labels from "A" to "ZZ" DENSITY DENSITY Integer 4 0 0 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. 0 No SAV VIMS SAV 1 0 - 10% cover (very sparse) VIMS SAV 2 10 - 40% cover (sparse) VIMS SAV 3 40 - 70% cover (moderate) VIMS SAV 4 70 - 100% cover (dense) VIMS SAV VIMS SAV BEDLABEL BEDLABEL String 6 0 0 The BedID and Density combined VIMS SAV A two-letter label and single digit density ZONE_ ZONE_ Integer 4 0 0 Chesapeake Bay Program Zone 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) 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) VIMS SAV 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) VIMS SAV 4 AAWPH, CHNPH, IOWPH, SPXPH, SVCPH (Delmarva Peninsula Coastal Bays) VIMS SAV CBPSEG CBPSEG String 6 0 0 Chesapeake Bay Program Segment abbreviations ("AAWPH", "IOWPH", "SPXPH","CHNPH", and "SVCPH" have been added to identify the Delmarva coastal bays) Chesapeake Bay Program CB1TF1 Northern Chesapeake Bay Segment 1 EPA Bay Program CB1TF2 Northern Chesapeake Bay Segment 2 EPA Bay Program NORTF Northeast River EPA Bay Program ELKOH1 Elk River Segment 1 EPA Bay Program ELKOH2 Elk River Segment 2 EPA Bay Program BOHOH Bohemia River EPA Bay Program C&DOH Chesapeake & Delaware Canal EPA Bay Program CB2OH Upper Chesapeake Bay EPA Bay Program SASOH1 Sassafras River Segment 1 EPA Bay Program SASOH2 Sassafras River Segment 2 EPA Bay Program BSHOH Bush River EPA Bay Program GUNOH1 Gunpowder River Segment 1 EPA Bay Program GUNOH2 Gunpowder River Segment 2 EPA Bay Program MIDOH Middle River EPA Bay Program BACOH Back River EPA Bay Program CB3MH Upper Central Chesapeake Bay EPA Bay Program PATMH Patapsco River EPA Bay Program MAGMH Magothy River EPA Bay Program CHSMH Lower Chester River EPA Bay Program CHSOH Middle Chester River EPA Bay Program CHSTF Upper Chester River EPA Bay Program CB4MH Middle Central Chesapeake Bay EPA Bay Program EASMH Eastern Bay EPA Bay Program CHOMH1 Mouth of the Choptank River EPA Bay Program CHOMH2 Lower Choptank River EPA Bay Program CHOOH Middle Choptank River EPA Bay Program CHOTF Upper Choptank River EPA Bay Program LCHMH Little Choptank River EPA Bay Program SEVMH Severn River EPA Bay Program SOUMH South River EPA Bay Program RHDMH Rhode River EPA Bay Program WSTMH West River EPA Bay Program CB5MH Lower Central Chesapeake Bay EPA Bay Program HNGMH Honga River EPA Bay Program FSBMH Fishing Bay EPA Bay Program NANMH Lower Nanticoke River EPA Bay Program NANOH Middle Nanticoke River EPA Bay Program NANTF Upper Nanticoke River EPA Bay Program WICMH Wicomico River EPA Bay Program TANMH1 Tangier Sound Segment 1 EPA Bay Program TANMH2 Tangier Sound Segment 2 EPA Bay Program MANMH1 Manokin River Segment 1 EPA Bay Program MANMH2 Manokin River Segment 2 EPA Bay Program BIGMH1 Big Annemessex River Segment 1 EPA Bay Program BIGMH2 Big Annemessex River Segment 2 EPA Bay Program POCMH Lower Pocomoke River EPA Bay Program POCOH Middle Pocomoke River EPA Bay Program POCTF Upper Pocomoke River EPA Bay Program PAXMH1 Lower Patuxent River Segment 1 EPA Bay Program PAXMH2 Lower Patuxent River Segment 2 EPA Bay Program PAXMH3 Lower Patuxent River Segment 3 EPA Bay Program PAXMH4 Lower Patuxent River Segment 4 EPA Bay Program PAXMH5 Lower Patuxent River Segment 5 EPA Bay Program PAXMH6 Lower Patuxent River Segment 6 EPA Bay Program PAXOH Middle Patuxent River EPA Bay Program PAXTF Upper Patuxent River EPA Bay Program WBRTF Western Branch of the Patuxent River EPA Bay Program POTMH Lower Potomac River EPA Bay Program POTOH1 Middle Potomac River Segment 1 EPA Bay Program POTOH2 Middle Potomac River Segment 2 EPA Bay Program POTOH3 Middle Potomac River Segment 3 EPA Bay Program POTTF Upper Potomac River EPA Bay Program MATTF Mattawoman Creek EPA Bay Program PISTF Piscataway Creek EPA Bay Program ANATF Anacostia River EPA Bay Program CB6PH Western Lower Chesapeake Bay EPA Bay Program CB7PH Eastern Lower Chesapeake Bay EPA Bay Program RPPMH Lower Rappahannock River EPA Bay Program CRRMH Corrotoman River EPA Bay Program RPPOH Middle Rappahannock River EPA Bay Program RPPTF Upper Rappahannock River EPA Bay Program PIAMH Piankatank River EPA Bay Program MOBPH Mobjack Bay EPA Bay Program YRKPH Lower York River EPA Bay Program YRKMH Middle York River EPA Bay Program MPNOH Lower Mattaponi River EPA Bay Program MPNTF Upper Mattaponi River EPA Bay Program PMKOH Lower Pamunkey River EPA Bay Program PMKTF Upper Pamunkey River EPA Bay Program JMSPH Mouth of the James River EPA Bay Program JMSMH Lower James River EPA Bay Program ELIPH Lower Elizabeth River EPA Bay Program WBEMH Western Branch of the Elizabeth River EPA Bay Program SBEMH South Branch of the Elizabeth River EPA Bay Program EBEMH Eastern Branch of the Elizabeth River EPA Bay Program LAFMH Lafayette River EPA Bay Program CHKOH Chickahominy River EPA Bay Program JMSOH Middle James River EPA Bay Program JMSTF1 Upper James River Segment 1 EPA Bay Program JMSTF2 Upper James River Segment 2 EPA Bay Program APPTF Appomattox River EPA Bay Program CB8PH Mouth of the Chesapeake Bay EPA Bay Program LYNPH Lynnhaven & Broad Bays EPA Bay Program AAWPH Assawoman Bay EPA Bay Program IOWPH Isle of Wight Bay EPA Bay Program SPXPH Sinepuxent Bay EPA Bay Program CHNPH Chincoteague Bay EPA Bay Program SVCPH Southern Va. Coastal Bays EPA Bay Program ST ST String 3 0 0 U.S. State which contains the SAV bed US State Abbreviations DC Washington DC State Abbreviations DE Delaware State Abbreviations VA Virginia State Abbreviations MD Maryland State Abbreviations sav_hab sav_hab String 50 0 0 YEAR YEAR SmallInteger 2 0 0 DensityDef DensityDef String 50 0 0 SHAPE_Area Shape_Area Double 8 0 0 Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. SAVHabitat SAVHabitat String 50 0 0 Acres Acres Double 8 0 0 Shape_Length Shape_Length Double 8 0 0 Length of feature in internal units. Esri Positive real numbers that are automatically generated. Surveyed Surveyed String 3 0 0 Whether the area was surveyed for SAV VIMS SAV Yes Surveyed VIMS SAV No Not Surveyed VIMS SAV Virginia Institute of Marine Science SAV Data Administrator mailing and physical address

Rt. 1208, Greate RD

Gloucester Point VA 23062 USA 804/684-7088 savadmin@vims.edu 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. US 10 24 51 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. VA MD U.S. Postal State Abbreviations DE Chesapeake Bay None Chincoteague Bay SAV vegetative surface cover submerged aquatic vegetation The 2010 Chesapeake Bay SAV Coverage was mapped from 1:24,000 black and white aerial photography to assess water quality in the Bay. Each area of SAV was interpreted from the rectified photography 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. 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. en 20100507 20101010 ground condition Complete Irregular -77.500 -75.000 39.750 36.500 None None SAV Ecology, Monitoring, & Restoration Program, Virginia Institute of Marine Science ArcGIS Metadata 1.0 <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The 2010 Chesapeake Bay SAV Coverage was mapped from 1:24,000 black and white aerial photography to assess water quality in the Bay. Each area of SAV was interpreted from the rectified photography 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.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV> 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. SAV Ecology, Monitoring, & Restoration Program, Virginia Institute of Marine Science Virginia Institute of Marine Science SAV Data Administrator 804/684-7088 Rt. 1208, Greate RD Gloucester Point VA 23062 US savadmin@vims.edu 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. US 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. 10 51 24 U.S. Postal State Abbreviations DE MD VA Chesapeake Bay Chincoteague Bay SAV vegetative surface cover submerged aquatic vegetation Chesapeake Bay DE MD 10 SAV 51 vegetative surface cover Chincoteague Bay VA submerged aquatic vegetation US 24 Access constraints: None None None Access constraints: None None ground condition 20100507 20101010 1 -77.500 -75.000 36.500 39.750 Esri ArcGIS 13.1.3.41833 Chesapeake Bay SAV Annual Monitoring GIS Dataset, 2010 20110315 20111031 20111031 Virginia Institute of Marine Science Rt. 1208 Greate RD Gloucester Point VA 23062 savadmin@vims.edu USA 804/684-7088 002 0 original metadata PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4NCjxtZXRhZGF0YSB4bWw6bGFu Zz0iZW4iPg0KICA8RXNyaT4NCiAgICA8Q3JlYURhdGU+MjAxMTA3Mjc8L0NyZWFEYXRlPg0KICAg IDxDcmVhVGltZT4wODQwMjUwMDwvQ3JlYVRpbWU+DQogICAgPEFyY0dJU0Zvcm1hdD4xLjA8L0Fy Y0dJU0Zvcm1hdD4NCiAgICA8U3luY09uY2U+RkFMU0U8L1N5bmNPbmNlPg0KICAgIDxEYXRhUHJv 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iiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKK KKACiiigAooooAKKKKAP/9k= File Geodatabase Feature Class 18.373 http://www.vims.edu/bio/sav dataset EPSG 6.18.3(9.3.1.2) 20230908 2010 SAV Aerial photography 9x9 inch b&w negatives 5/7/2010 - 10/10/2010 24000 2010 SAV Aerial photography Airphotographics Inc 2115 Kelly Island Road Martinsburg WV 25405 info@airphotographics.com USA (800) 624-8993 (304) 267-0918 20101010 20101010 2009 SAV Orthophoto Mosaics 5/7/2010 - 10/10/2010 24000 2009 SAV Orthophoto Mosaics 20111215 20111215 Virginia Institute of Marine Science State boundaries adjusted to include shore areas State boundaries adjusted to include shore areas 20081006 20081006 Virginia Instute of Marine Science New 2004 Chesapeake Bay Program Segments adjusted to include land areas New 2004 Chesapeake Bay Program Segments adjusted to include land areas 20081006 20081006 Virginia Institute of Marine Science Scanned aerial photographs were georectified and orthographically corrected to produce a seamless series of aerial mosaics following a set of standard operating procedures (SOP). Leica LPS image processing software was used to orthographically correct the individual flight lines using a bundle block solution. Camera lens calibration data was matched to the image location of fiducial points to define the interior camera model. Control points from USGS DOQQ images provide the exterior control, which is enhanced by a large number of image-matching tie points produced automatically by the software. The exterior and interior models were combined with a 30-meter resolution digital elevation model (DEM) from the USGS National Elevation Dataset (NED) to produce an orthophoto for each aerial photograph. The orthophotographs that cover each USGS 7.5 minute quadrangle area were adjusted to approximately uniform brightness and contrast and were mosaicked together using the Leica GeoSystems ERDAS Imagine mosaic tool to produce a one-meter resolution quad-sized mosaic. 20101215 The SAV beds were interpreted on-screen from the orthophoto mosaics using ESRI ArcGIS software. The identification and delineation of SAV beds by photo interpretation utilized all available information including: knowledge of aquatic grass signatures on film, distribution of SAV in 2010 from aerial photography, 2010 ground survey information, and aerial site surveys. 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. 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 map number and year of photography, these letter designations uniquely identify each SAV bed in the database. 20110315 The bay segments were overlayed on the dataset by VIMS staff, dividing any beds that fell into multiple segments. 20110315 he state boundaries were overlayed on the dataset by VIMS staff, dividing any beds that fell into multiple states. 20110315 The density attribute for all beds has been reviewed by an experienced photo-interpreter for correctness and consistency with analysis for prior years. 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. The GIS data has been cross-checked against data tables and ground observations. 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. Virginia Institute of Marine Science SAV Data Administrator Rt. 1208 Greate Rd. Gloucester Point VA 32061 savadmin@vims.edu USA 804/684-7088 None