Database fields in category Geographic location

Label	Statistics	Description
`district`		Name of the general area in which the site is located.
`quad_250`		USGS topographic maps on which the site is located. The first two letters are a code for the 1:250,000-scale quadrangle.
`quad_63360`		USGS topographic maps on which the site is located. Maps are identified in two parts, a two-letter code for the 1:250,000-scale quadrangle followed by the letter, hyphen, and number(s) used to designate the 1:63,360-scale map sheet. following USGS.
`latitude`		Location of the site in decimal degrees. Some sites cover large areas and the location given is a point at the approximate center of the area.
`longitude`		Location of the site in decimal degrees. Some sites cover large areas and the location given is a point at the approximate center of the area.
`location`		A narrative description of the location of the site and its areal extent, which should also include information on the reliability of the location.