LatitudeLongitude: When looking at a map, consider a rectangle that encloses the area of interest to you. In the United Sates, the absolute values of the maximum latitude and longitude define the upperleft (NW) corner, and the absolute values of the minimum latitude and longitude define the lowerright (SE) corner of that box.  Remember latitude should be entered as a positive decimal number for locations in the United States
 Remember longitude should be entered as a negative decimal number for locations in the United States
 Try the USGS EarthExplorer system at this web site http://earthexplorer.usgs.gov to help find the approximate latitude and longitude
 For the best results define the smallest practical latitudelongitude box that includes the area of interest; retrievals from unnecessarily large latitudelongitude boxes (1x1 degree, for example) may yield many undesired sites.
