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Digital Elevation Models (DEM) - New York State
ThemeElevation (10m raster)
Note that a few quadrangles in New York State that fall primarily in other states are missing elevation data -- please review current DEM data availability
If you prefer, select quad sheets by map rather than by name.
MapsheetSeeley Creek 7.5-minute Quad
ProviderNYS Department of Environmental Conservation
For additional datasets available from NYSDEC, see the list of DEC datasets at the NYSGIS Clearinghouse.
FormatDigital Elevation Model (DEM) .dem
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Coordinate System Universal Transverse Mercator | Meters | Zone 17 or 18 or 19
DatumNorth American Datum of 1927
Publication date Unknown
Date added or updated not specified
DescriptionAbstract
A Digital Elevation Model (DEM) contains a series of elevations ordered from south to north with the order of the columns from west to east. The DEM is formatted as one ASCII header record (A-record), followed by a series of profile records (B-records) each of which include a short B-record header followed by a series of ASCII integer elevations per each profile. The last physical record of the DEM is an accuracy record (C-record). The 7.5-minute DEM (10- by 10-m data spacing, elevations in decimeters) is cast on the Universal Transverse Mercator (UTM) projection (the quads UTM zone can be found in the header record (Record A)) in the North American Datum of 1927. It provides coverage in 7.5- by 7.5-minute blocks. Each product provides the same coverage as a standard USGS 7.5-minute quadrangle, but overedges are published as separate DEM files. Coverage is available for all quads completely contained within New York State, plus some additional ones falling along the borders and containing significant area of the State's land.
Purpose
DEMs can be used as source data for digital orthophotos and as layers in geographic information systems for earth science analysis. DEMs can also serve as tools for volumetric analysis, for site location of towers, or for drainage basin delineation. These data are collected as part of the National Mapping Program.
Supplemental Information
7.5-minute DEMs have rows and columns which vary in length and are staggered. The UTM bounding coordinates form a quadrilateral (no two sides are parallel to each other), rather than a rectangle. The user will need to pad out the uneven rows and columns with blanks or flagged data values, if a rectangle is required for the user's application. Some software vendors have incorporated this function into their software for input of standard formatted USGS DEMs.
Topicselevation
File size2468 kilobytes
Use constraints1. The NYS DEC and the U.S. Geological Survey asks to be credited in derived products. 2. Secondary Distribution of the data is not allowed. 3. Any documentation provided is an integral part of the data set. Failure to use the documentation in conjunction with the digital data constitutes misuse of the data. 4. Although every effort has been made to ensure the accuracy of information, errors may be reflected in the data supplied. The user must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions.
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