How does the data set represent geographic features?
• How are geographic features stored in the data set? This is a Vector data set. It contains the following vector data types (SDTS terminology): • Point (791) • String (2131) • GT-polygon composed of chains (792) • What coordinate system is used to represent geographic features? The map projection used is Polyconic. Projection parameters: Longitude_of_Central_Meridian: -117.5625 Latitude_of_Projection_Origin: 34.125 False_Easting: 0.00000 False_Northing: 0.00000 Planar coordinates are encoded using coordinate pair Abscissae (x-coordinates) are specified to the nearest 0.0027668485417 Ordinates (y-coordinates) are specified to the nearest 0.0027668485417 Planar coordinates are specified in Meters The horizontal datum used is North American Datum of 1927. The ellipsoid used is Clarke 1866. The semi-major axis of the ellipsoid used is 6378206.4. The flattening of the ellipsoid used is 1/294.98. • How does the data set describe geographic features? Entity_and_Attribute_Overview: Version 1.
• How are geographic features stored in the data set? • This is a Vector data set. It contains the following vector data types (SDTS terminology): • G-polygon (1226) • What coordinate system is used to represent geographic features? • The map projection used is Lambert Conformal Conic. • Projection parameters: • Standard_Parallel: 37.000000 • Standard_Parallel: 39.500000 • Longitude_of_Central_Meridian: -79.500000 • Latitude_of_Projection_Origin: 36.000000 • False_Easting: 0.000000 • False_Northing: 0.000000 • Planar coordinates are encoded using coordinate pair • Abscissae (x-coordinates) are specified to the nearest 0.000032 • Ordinates (y-coordinates) are specified to the nearest 0.000032 • Planar coordinates are specified in meters • The horizontal datum used is North American Datum of 1983. • The ellipsoid used is Geodetic Reference System 80. • The semi-major axis of the ellipsoid used is 6378137.000000. • The flattening of the ellipsoid used is 1/298.257222.
• How are geographic features stored in the data set? This is a vector data set. It contains the following vector data types (SDTS terminology): • Entity point • Complete chain • GT-polygon composed of chains • What coordinate system is used to represent geographic features? Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 16 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -87 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0.0 Planar coordinates are encoded using coordinate pair Abscissae (x-coordinates) are specified to the nearest unknown Ordinates (y-coordinates) are specified to the nearest unknown Planar coordinates are specified in meters The horizontal datum used is NAD27. The ellipsoid used is CLARKE 1866. The semi-major axis of the ellipsoid used is 6378206. The flattening of the ellipsoid used is 1/294.98. • How does the data set describe geographic
• How are geographic features stored in the data set? This is a Vector data set. It contains the following vector data types (SDTS terminology): • G-polygon (100) • What coordinate system is used to represent geographic features? The map projection used is Lambert Conformal Conic. Projection parameters: Standard_Parallel: 47.500000 Standard_Parallel: 48.733333 Longitude_of_Central_Meridian: -120.833333 Latitude_of_Projection_Origin: 47.000000 False_Easting: 1640416.666667 False_Northing: 0.000000 Planar coordinates are encoded using coordinate pair Abscissae (x-coordinates) are specified to the nearest 0.000250 Ordinates (y-coordinates) are specified to the nearest 0.000250 Planar coordinates are specified in survey feet The horizontal datum used is D_North_American_1983_HARN. The ellipsoid used is Geodetic Reference System 80. The semi-major axis of the ellipsoid used is 6378137.000000. The flattening of the ellipsoid used is 1/298.257222. Vertical_Coordinate_System_Definition: Altitu
• How are geographic features stored in the data set? This is a Vector data set. It contains the following vector data types (SDTS terminology): • GT-polygon composed of chains (979) • What coordinate system is used to represent geographic features? Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest .001. Longitudes are given to the nearest .001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is North American Datum 1927. The ellipsoid used is Clarke 1866. The semi-major axis of the ellipsoid used is 6378206.4. The flattening of the ellipsoid used is 1/294.98. • How does the data set describe geographic features? w13eledd.dbfShapefile Attribute Table Grid_codenumeric code for elevation ranges in feet Range of values Minimum:-9999 Maximum:750 Legendtext description/label of elevation ranges in feet Character field Entity_and_Attribute_Overview: Areas defined as “no c
