lchamplgeowtl

20260514 08564600 FALSE 20260514 08253900 20260514 08253900 FALSE 1.0 Lake_Champlain_Lake_George_Wetland 002 Projected GCS_WGS_1984 Linear Unit: Meter (1.000000) 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/3.6.0'><WKT>PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator_Auxiliary_Sphere"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],PARAMETER["Auxiliary_Sphere_Type",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",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> ESRI ArcCatalog 9.3.1.3500 en All or part of 22 USGS 7.5' quadrangle-based wetland coverages were prepared for the Lake Champlain/Lake George watersheds within the New York State Adirondack Park using ArcGIS 9.3.1 at the Remote Sensing/GIS Laboratory, State University of NY (SUNY) Plattsburgh. Wetland delineations on 1:40000 color infrared NAPP air photo transparencies were scanned and geocorrected. Wetlands were digitized as line shapefiles in ArcGIS from the geocorrected scanned imagery using ArcGIS ERDAS Stereo Analyst extension. Individual quadrangrangle line shapefiles were merged into a single polygon and arc coverage, which was edited and attributed in ArcInfo. This wetlands database consists of both polygon and linear features labeled using National Wetlands Inventory (NWI) conventions as modified for use by the NYS Adirondack Park Agency. The wetland coverage was exported as an Arc Interchange File to the New York State, Executive Department, Adirondack Park Agency (NYS APA) running ArcInfo version 9.x. The wetlands database is part of a larger database designed to help evaluate watershed/wetland relationships and provide data for cumulative impact assessments. The outreach efforts to share the Agency natural resource database will encourage resource appreciation and wise use, particularly in a regional context. Color infrared transparencies with wetlands delineated on acetate overlays were scanned at 2000 dpi into tif files using an Epson Expressions XL 10000 scanner at the SUNY Plattsburgh Remote Sensing/GIS Laboratory. Air photos and their stereo pairs were geocorrected using the ArcGIS ERDAS Image Analysis extension, orthothoimagery from the NYS GIS Clearinghouse, USGS DEM files from CUGIR, and USGS camera calibration files. Transfer from acetate overlays to digital wetland arc shapefiles was done using the ArcGIS ERDAS Stereo Analyst extension, Sterographics CrystalEyes3 glasses and E-2 emitter. All digital files used the UTM Zone 18N NAD83 coordinate system. Line shapefiles were appended into a single arc and polygon coverage with the outer boundary of the study area and the 7.5' USGS quadrangle boundaries. Digital wetland boundaries were edited in coverage format with a snapdistance 20.0 meters, snaptype closest, weed tolerance 3.0 meters, and a fuzzy tolerance of 1.219 meters. Wetland labels were added during heads-up editing with a customized on-screen menu using the georeferenced air photo acetate wetland overlays as a backdrop. Wetland label columns were concatenated into a unified wetland label using ArcInfo. Wetland labels follow the conventions established by Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. FWS/OBS-79/31. Office of Biological Services, U.S. Fish and Wildlife Service. U.S. Department of the Interior, Washington, D.C. 103 pp. Some modifications to the conventions were made to accommodate this project and are noted in the NWI label tables accompnaying this metadata. Files were transported to the NYS APA as ArcInfo export files (no compression) . New York State Adirondack Park Agency 20101231 lchamplgeowtl lchamplgeowtl vector digital data withheld Version 1.0 Watershed Scale Protection for Adirondack Wetlands Effectiveness of and Enhancements to the Adirondack Park Agency's Wetland Protection Program Ray Brook, NY New York State Adirondack Park Agency Daniel M. Spada, Project Director imagery and orthoimagery dates 19940504 19940514 19950417 19950507 19970508 Complete As needed -73.781598 -73.338500 44.212724 43.289268 598834.846777 632745.026877 4794238.212225 4896244.191610 None Wetlands Vegetation NWI cover types Geographic Information System (GIS) ArcInfo New York Adirondack Park Adirondack Mountains Lake Champlain Lake George Geographic Names Information System Date of aerial photography and orthoimagery: 1994-1995 None None None These data may not be used for legal determinations. Please credit use of this data set to the New York State Adirondack Park Agency, Ray Brook, New York 12977. Please send a copy of any reports or papers in which these data were used or referenced to the above address, Attention: Susan VanWormer, Librarian. ArcInfo Coverage Funding was provided by the US Environmental Protection Agency Office of Wetlands Protection; State Wetlands Protection Program; Project #C200609 to the New York State Adirondack Park Agency. Subcontractors for portions of the grant were the Remote Sensing/GIS Laboratory, Plattsburgh State University, NYS Adirondack Park Agency Daniel M. Spada mailing and physical address

Route 86, P.O. Box 99

Ray Brook New York 12977 USA (518) 891-4050 (518) 891-3938 Supervisor Natural Resource Analysis dmspada@gw.dec.state.ny.us 8:30 AM - 4:30 PM Monday through Friday None Unclassified None Esri ArcGIS 13.6.3.59530 Lake_Champlain_Lake_George_Wetland 598834.846777 632745.026877 4896244.19161 4794238.212225 1 -73.781598 -73.3385 44.212724 43.289268 1 en FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time mailing address Plattsburgh NY 12901

Center for Earth & Environmental Science

State University of NY at Plattsburgh

101 Broad Street

(518) 564-2020 Eileen B. Allen State University of NY at Plattsburgh, GIS Laboratory GIS Coordinator (518) 564-5267 eileen.allen@plattsburgh.edu 20101010 Unclassified none none ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset Downloadable Data, may be available on other media such as CD. Wetlands in the Lake Champlain/Lake George basins. 6.914 6.914 ARCE ArcInfo 9.3.1 no compression applied NYS Adirondack Park Agency Daniel M. Spada (518) 891-4050 (518) 891-3938 Supervisor Natural Resource Analysis dmspada@gw.dec.state.ny.us Although these data have been processed successfully on a computer system at the NYS APA, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that these data be directly acquired from the NYS APA, and not indirectly through other sources which may have changed the data in some way. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The NYS APA shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data shall not be used for legal jurisdictional determinations. These data were created in ESRI's ArcGIS 9.3.1 ArcInfo coverage format. 002 withheld Local Area Network 6.914 ArcInfo Coverage File Geodatabase Feature Class Vector Wetlands are defined as polygons identified by a software-placed label point or as an arc labeled with a wetland cover type. Some arcs and polygons represent boundaries imposed by the study area boundary and therefore do not represent true feature boundaries. All non-wetland polygons possess a U SYSTEM and NWILABEL. All non-wetland arcs possess a blank cover type label. Simple FALSE 0 TRUE FALSE GCS_North_American_1983 NAD_1983_UTM_Zone_18N coordinate pair meters 0.000000 0.000000 North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 NAD_1983_UTM_Zone_18N EPSG 6.18.3(9.3.1.2) 0 Lake_Champlain_Lake_George_Wetland Feature Class 0 Arc attribute table ArcInfo 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. AREA AREA Double 8 0 0 PERIMETER PERIMETER Double 8 0 0 LCHAMPLGEO LCHAMPLGEO Integer 4 0 0 LCHAMPLG_1 LCHAMPLG_1 Integer 4 0 0 SYSTEM 2 2 String P Palustrine habitat, non-tidal, less than 8 hectares (20 acres) and less than 2 meters deep R2 Lower perennial riverine R3 Upper perennial riverine R4 Intermittent riverine Complex of wetlands and deepwater habitats that share the influence of similar hydrologic, geomorphologic, chemical, or biological factors. This parameter is mandatory for all linear wetlands in the study area. Cowardin et al 1979 Attributes derived from photointerpretation techniques. As needed SYSTEM 0 0 CLASS1 3 3 String EM1 Persistent emergent FO1 Forested, broad-leaved deciduous FO4 Forested, evergreen OW Open water SB3 Stream bed, cobble/gravel SS1 Scrub/shrub (shorter than 6 meters), broad-leaved deciduous SS4 Scrub/shrub (shorter than 6 meters), Needle-leaved evergreen General appearance of the habitat in terms of either the dominant life form of the vegetation or the physiography and composition of the substrate. Covers at least 30% of the substrate. A value in this column is mandatory for all linear wetlands. Cowardin et al 1979 Attributes derived from photointerpretation techniques. As needed CLASS1 0 0 CLASS2 4 4 String /FO4 Forested, evergreen /SS1 Scrub/shrub (shorter than 6 meters), broad-leaved deciduous General appearance of the habitat in terms of either the dominant life form of the vegetation or the physiography and composition of the substrate. Covers at least 30% of the substrate. Life form must be the same or lower in height than CLASS1. If the same general life form as CLASS1 (ex. FO), CLASS2 has equal or less areal extent. A value in this column is not mandatory. Cowardin et al 1979 Attributes derived from photointerpretation techniques. As needed CLASS2 0 0 REGIME 1 1 String B Saturated E Seasonally flooded, saturated H Permanent The water regime modifier describes the hydrologic characteristics of the community. Only non-tidal regimes were used in the Adirondacks. A value in this column is mandatory for all linear wetlands. Cowardin et al 1979 Attributes derived from photointerpretation techniques. As needed REGIME 0 0 SPECIAL1 2 2 String Special modifiers are used to denote man-made or beaver modifications to the habitat. Optional parameter. Cowardin et al 1979 d Partially drained/ditched f Farmed r Artificial x Excavated Attributes derived from photointerpretation techniques. As needed SPECIAL1 0 0 SPECIAL2 2 2 String d Partially drained/ditched f Farmed Special modifiers are used to denote man-made or beaver modifications to the habitat. Optional parameter. Cowardin et al 1979 SPECIAL2 0 0 SPECIAL3 2 2 String Special modifiers are used to denote man-made or beaver modifications to the habitat. Optional parameter. Cowardin et al 1979 Attributes derived from photointerpretation techniques. As needed SPECIAL3 0 0 NWILABEL 16 16 String Unified label of SYSTEM, CLASS1, CLASS2, REGIME, SPECIAL1, SPECIAL2, and SPECIAL3. See the definitions of the individual components. This attribute is considered the NWI wetland label. Mandatory parameter for all linear wetlands within the study area, including linear uplands. Cowardin et al 1979 see component values Attributes derived from photointerpretation techniques. 19940504 19970508 NWILABEL 0 0 Shape_Length Shape_Length Double 8 0 0 Length of feature in internal units. Esri Positive real numbers that are automatically generated. Shape_Area Shape_Area Double 8 0 0 Area of feature in internal units squared. Esri Positive real numbers that are automatically generated. lchamplgeowtl.pat Feature Class 6999 Polygon attribute table ArcInfo FID FID OID 4 0 0 Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. As needed Shape Shape Geometry 0 0 0 Feature geometry. ESRI Coordinates defining the features. As needed AREA 8 18 Float 5 Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. As needed 1994 (imagery date) 1995 (imagery date) PERIMETER 8 18 Float 5 Perimeter of feature in internal units. ESRI Positive real numbers that are automatically generated. 1994 (imagery date) 1995 (imagery date) As needed LCHAMPLGEOWTL# 4 5 Binary Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. LCHAMPLGEOWTL-ID 4 5 Binary User-defined feature number. ESRI As needed SYSTEM 2 2 Character L1 Lacustrine limnetic habitat, greater than 8 hectares (20 acres) and more than 2 meters deep Cowardin et al 1979 P Palustrine habitat, non-tidal, less than 8 hectares (20 acres) and less than 2 meters deep R2 Lower perennial riverine R3 Upper perennial riverine U Upland Complex of wetlands and deepwater habitats that share the influence of similar hydrologic, geomorphologic, chemical, or biological factors. This parameter is mandatory for all polygons in the study area. Cowardin et al 1979 Attributes derived from photointerpretation As needed CLASS1 3 3 Character AB3 Aquatic bed, rooted vascular EM1 Persistent emergent FO1 Forested, broad-leaved deciduous FO4 Forested, evergreen FO5 Forested, dead OW Open water SS1 Scrub/shrub (shorter than 6 meters), broad-leaved deciduous SS2 Scrub/shrub (shorter than 6 meters), broad-leaved evergreen SS3 Scrub/shrub (shorter than 6 meters), broad-leaved evergreen SS4 Scrub/shrub (shorter than 6 meters), needle-leaved evergreen SS5 Scrub/shrub (shorter than 6 meters), dead UB3 Unconsolidated bottom, mud US2 Unconsolidated shore, sand General appearance of the habitat in terms of either the dominant life form of the vegetation or the physiography and composition of the substrate. Covers at least 30% of the substrate. A value in this column is mandatory for all linear wetlands. Cowardin et al 1979 Attributes derived from photointerpretation techniques. CLASS2 4 4 Character /AB3 Aquatic bed, rooted vascular /EM1 Persistent emergent /FO1 Forested, broad-leaved deciduous /FO4 Forested, evergreen /FO5 Forested, dead /OW Open water /SS1 Scrub/shrub (shorter than 6 meters), broad-leaved deciduous /SS3 Scrub/shrub (shorter than 6 meters), broad-leaved evergreen /SS4 Scrub/shrub (shorter than 6 meters), needle-leaved evergreen /SS5 Scrub/shrub (shorter than 6 meters), dead General appearance of the habitat in terms of either the dominant life form of the vegetation or the physiography and composition of the substrate. Covers at least 30% of the substrate. Life form must be the same or lower in height than CLASS1. If the same general life form as CLASS1 (ex. FO), CLASS2 has equal or less areal extent. A value in this column is not mandatory. Cowardin et al 1979 Attributes derived from photointerpretation techniques. As needed REGIME 1 1 Character B Saturated D Seasonally flooded - well drained E Seasonally flooded - saturated H Permanent The water regime modifier describes the hydrologic characteristics of the community. Only non-tidal regimes were used in the Adirondacks. A value in this column is mandatory for all wetland polygons. Cowardin et al 1979 Attributes derived from photointerpretation techniques. As needed SPECIAL1 2 2 Character b Beaver d Partially drained, ditched f Farmed h Diked/impounded r Artificial s Spoil x Excavated Special modifiers are used to denote man-made or beaver modifications to the habitat. Optional parameter. Cowardin et al 1979 Attributes derived from photointerpretation techniques. As needed SPECIAL2 2 2 Character Special modifiers are used to denote man-made or beaver modifications to the habitat. Optional parameter. Cowardin et al 1979 f Farmed x Excavated Attributes derived from photointerpretation techniques. As needed SPECIAL3 2 2 Character Special modifiers are used to denote man-made or beaver modifications to the habitat. Optional parameter. Cowardin et al 1979 Attributes derived from photointerpretation techniques. As needed NWILABEL 16 16 Character Unified label of SYSTEM, CLASS1, CLASS2, REGIME, SPECIAL1, SPECIAL2, and SPECIAL3. See the definitions of the individual components. This attribute is considered the NWI wetland label. Mandatory parameter for all polygons within the study area, including upland polygons. Cowardin et al 1979 see component values 19940504 19970508 Attributes derived from photointerpretation techniques. As needed 20260514 Corlor infrared aerial photo transparenceis with acetate wetland delineation overlays and their stereo pairs were scanned at 2000 dpi. 20071204 20560000 Eileen B. Allen mailing and physical address

Center for Earth & Environmental Science, 101 Broad Street

Plattsburgh NY 12901 USA withheld withheld USGS Report of Calibration of Aerial Mapping Camera document Camera calibration reports are produced by USGS. Four different reports were used for this project that correspond to the camera and lens serial numbers. The report numbers used are OSL/1782, OSL/2160, OSL/1962, and OSL/1950. 1992-1996 19921002 19940106 19940208 19960119 online CAMERA Camera information used to geocorrect scanned air photo transparencies. Eileen B. Allen Aerial photos with wetland delineation overlays and their stereo pairs were geocorrected using ArcGIS and the ERDAS Image Analysis extension withheld withheld Extract wetland delineations from aerial photo overlays into line shapefiles using ArcGIS and ERDAS Stereo Analyst extension. Work was done using geocorrected stereo air photos with Stereographics Crystal Eyes3 and E-2 emmitter. withheld withheld Merge individual photo line shapefiles into a study area-wide coverage. Add quadrangle boundaries and outer watershed boundary. Clean with 1.219 fuzzy tolerance and 0.00 dangle tolerance into a polygon and arc ArcInfo coverage. withheld withheld Extract 7.5' quadrangle areas from WTL-COV for labeling and editing purposes. Edit coverage to ensure closed polygons and delete extraneous dangles. Roughly georeference the wetland delineation overlay from the aerial photos and use as a backdrop to label arcs and polygons using a customized screen menu. Concatenate SYSTEM, CLASS1, CLASS2, REGIME, SPECIAL1, SPECIAL2, and SPECIAL3 into NWILABEL using ArcInfo Info for both arcs and label points. BUILD coverages. withheld withheld Merge individual quadrangle coverages into a unified wetland coverage for the study area. Check adjoining quadrangle boundaries and ensure that wetland delineations and labels match across boundaries and then remove quadrangle boundary arcs. List all arc and polygon wetland labels to check for unlabeled polygons and either illegal or illogical wetland labels. Visually examine the wetland coverages in ArcMap to discover wetland spatial and attribute problems. Examine coverages for adjoining wetlands with the same NWI label but without an intervening labeled arc. Peruse wetland coverage over orthophotos (SID format in ArcGIS, convert SID files into merged IMG files for ArcInfo) at a scale of 1:5000 and correct spatial errors to ensure reasonable delineations at a scale of 1:24000. Make any edit changes in ArcInfo with ArcTools edit tools and a customized on-screen attribute menu. BUILD or CLEAN as needed. withheld withheld Digital Elevation Model USGS Unknown DEM created by NYS Department of Environmental Conservation and tiled by 7.5' quadrangle. Files downloaded from the Cornell Univeristy Geospatial Information Repository (CUGIR). These files are 10-m raster files in NAD27. While the elevation resolution is 0.1 meter, vertical accuracy is 6-8 meters. http://cugir.mannlib.cornell.edu/datatheme.jsp?id=23 24000 online DEM Elevation file used to geocorrect scanned air photo files. New York State Digitally Enhanced Orthoimagery NYS GIS Clearinghouse remote-sensing image Orthoimagery produced from NAPP imagery through the federal Digital Orthophotgraphy Quarter Quadrangle program (DOQQ), the NYS Department of Environmental Conservation, and enhanced through NYS Y2K emergency preparedness planning effort. http://www.nysgis.state.ny.us/gateway/mg/napp_descrip.htm 12000 online ORTHOS Map base for geocorrection of scanned aerial imagery and for QA/QC of wetland positional accuracy of final wetland files. 19940504 19940514 19950417 19950507 19970508 ground condition Lake Champlain/Lake George outer watershed boundary 2010 File developed from digital 7.5' and 7.5 x 15' USGS topographic maps. 24000 disc OUTER Outer study area boundary. Used as a boundary for mapping wetlands and for clipping digital files. A digital watershed data layer derived from digital USGS 7.5' and 7.5' x 15' topographic maps defined the outer boundary of the mapped area. Wetland aerial photography acetate overlays of wetland delineations NYS Adirondack Park Agency document 40000 stable-base material OVERLAY Wetland delineation overlay for aerial photos. Used to create wetland digital files and for attributing wetlands. ground condition on aerial imagery date National Aerial Photography Program (NAPP) USGS remote-sensing image 9" x 9" color infrared vertical aerial photographic transparencies. 40000 transparency PHOTOS Color infrared aerial photos used for wetland delineations. Wetland overlays were retained on imagery for geocorrection and extraction of wetland boundaries to shapefiles. 19940504 19940514 19950417 19950507 19970508 ground condition 7.5' Quadrangle Index NYS Adirondack Park Agency vector digital data http://www.apa.state.ny.us/gis/shared/htmlpages/data.html#wetl 24000 disc QUADS 7.5' quadrangle boundaries used to subset study area for wetland data creation, editing, and attribution. Attributes assigned to polygon features consist of unique User-Ids and wetland labels. Arc attributes include a unique User-ID, ARCVALUE to identify quadrangle and watershed boundaries, and wetland labels for linear wetlands. Quadrangle boundaries were temporary for the purposes of editing and attribution and were removed prior to creating the final coverage. Polygon and linear wetland labels were derived from photointerpretation techniques. Wetland labels were entered by georeferencing the scanned air photo acetate overlay of wetland delineations to the digital wetland coverage. To minimize typographical errors, both polygon and linear wetland labels were entered utilizing an on-screen menu consisting of columns representing wetland label components. Label columns were concatenated in ArcInfo to create a unified wetland cover type label. The NWILABEL item was visually checked on the computer screen for integrity and labeling accuracy. Polygon and linear wetland labels were summarized in ArcMap to identify nonsensical or illogical NWI labels, which were corrected in ArcInfo ArcEdit. Unknown Polygon and linear wetland cover type labels were derived from photointerpretation techniques. All photo overlays were checked by two independent interpreters for missing wetlands, uplands delineated as wetland, incorrectly delineated polygons, missing wetland labels, and incorrect wetland labels by two people in a prior project. Photo overlays were directly compared to the digital wetland files utilizing scanned copies of the photo overlays corrected to the wetland delineations. This process facilitated the entry of wetland cover type labels and to discover missing arcs. Digitized and scanned coverage hard copies were directly compared to orthophoto overlays to check for missing arcs. The process of digitally labeling the wetland coverages also helped to resolve some missing, incomplete, and nonsensical labels. Finally, all wetland labels were printed in tabular form and proof-read to ensure both complete labeling of the coverage and logical label content. No quantitative accuracy assessment was performed. Polygons: All polygons were required to possess either a wetland or upland cover type (i.e., a SYSTEM entry and therefore a final NWILABEL entry were mandatory). During the labeling process, digital polygons were checked for the presence of a label point and incomplete polygons were repaired. Arcs: Only linear wetlands arcs received a wetland label. ArcMap was used to color-code linear wetlands to help discover those linear wetlands missing a label or those that were labeled improperly. Only linear wetlands were allowed to exhibit dangle nodes. Inter-coverage consistency: Wetland labels and arcs along adjacent quadrangle edges were proofread using ArcMap and corrected in ArcInfo ArcEdit. Extensive quality assurance/quality control measures were taken for all steps of database creation. All wetland labels were reviewed for conformance to National Wetlands Inventory standards. It is expected that because the derivation of data from photointerpretation techniques, uncorrectable errors and mistakes may be present. Identifiable mistakes will be corrected as needed. These wetland maps contain only those wetlands that were identifiable from aerial photographs. Horizontal positional accuracy has error potential from several different steps: photointerpretation, air photo rectification, and digitizing techniques.While great care was taken at every step, no formal quantitative accuracy assessment was conducted. No vertical coordinates are associated with this data set. Scanned air photo transparencies were geocorrected to orthhoimagery created from the same imagery. 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