How does the data set represent geographic features?
• How are geographic features stored in the data set? This is a Point data set. It contains the following vector data types (SDTS terminology): • Entity Point (101) • 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 0.01. Longitudes are given to the nearest 0.01. Latitude and longitude values are specified in Decimal degrees. • How does the data set describe geographic features? Entity_and_Attribute_Overview: This data set contains 430 distinct attributes, some of which directly describe entities and some merely qualify the values of other attributes. Documenting these attributes using the detailed form of the Content Standards for Digital Geospatial Metadata is possible in principle but cannot be carried out in a timely fashion. In general the attributes describe two types of entities, dust samples collected from traps deployed in Southweste
• 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 (378) • String (1083) • GT-polygon composed of chains (379) • What coordinate system is used to represent geographic features? The map projection used is Polyconic. Projection parameters: Longitude_of_Central_Meridian: -117.0625 Latitude_of_Projection_Origin: 33.7500 False_Easting: 0.00000 False_Northing: 0.00000 Planar coordinates are encoded using coordinate pair Abscissae (x-coordinates) are specified to the nearest 0.000001 Ordinates (y-coordinates) are specified to the nearest 0.000001 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 1.0 of the Lake
• How are geographic features stored in the data set? • 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 0.00005. Longitudes are given to the nearest 0.00005. Latitude and longitude values are specified in Decimal Degrees. 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: The shoreline is categorized on the basis of type and ESI Ranking, where the definition of a specific category can vary between estuarine, lacustrine, riverine, and palustrine environments. ESI Rankings are divided into ten categories controlled by relative exposure to wave and tidal energy, shoreline slope, substrate type, and biological produ
• 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 (3836) • String (9565) • GT-polygon composed of chains (3837) • What coordinate system is used to represent geographic features? The map projection used is Albers Conical Equal Area. Projection parameters: Standard_Parallel: 29.5 Standard_Parallel: 45.5 Longitude_of_Central_Meridian: -96.0 Latitude_of_Projection_Origin: 23.0 False_Easting: 0.00000 False_Northing: 0.00000 Planar coordinates are encoded using coordinate pair Abscissae (x-coordinates) are specified to the nearest 50 Ordinates (y-coordinates) are specified to the nearest 50 Planar coordinates are specified in Meters The horizontal datum used is North American Datum of 1983. The ellipsoid used is GRS1980. 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_
• How are geographic features stored in the data set? This is a Point data set. It contains the following vector data types (SDTS terminology): • Entity point (31) • 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 0.0001. Longitudes are given to the nearest 0.0001. Latitude and longitude values are specified in decimal degrees. 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: The columns and their definitions are listed below. All values that were less than (<) were converted to minus (-). Samples were processed by several methods. As a result, there was duplication of analyses for some elements. Rock samples
