Latitude:                                    (defines image center)
Longitude:                                   (defines image center)
Image type: Aerial Photo Topo Map                   (Topo maps require Scale>=2m/pixel)
Scale (meters/pixel): 1 2 4 8 16 32 64 (Higher=broader area, less detail)
Width:                                              (image width in pixels, max 2000)
Height:                                             (image height in pixels, max 2000)
Grid?:      yes no                                  (adds lines along center lat/lon)

Add any Latitude/Longitude within the US. Must be in decimal format. Areas outside the US are not covered.

Most GPS receivers will display coordinates in decimal format. If you're starting with known coordinates in Degree/Minute/Seconds format, you must first convert to decimal. Enter the D/M/S numbers in the form below. Press Compute; the decimal values will appear in the upper form (requires a Javascript-enabled browser). The (Reverse) button converts the decimal values to D/M/S.

The Grid option draws lines along the specified latitude and longitude, effectively placing a crosshairs at the coordinates. It also displays the coordinate numbers near the image borders, which is handy for future reference.

Plan to print? The grayscale images are often too dark to print out well. Lightened with an image editor, they're much better. Use proportions that match the aspect ratio and/or size of the printable area of a sheet of paper. 1024x768 is about right to completely fill a letter-size page.

Images generally date from the late 80s to the late 90s. Where I've checked, those of the Lake Chelan, WA area date mostly from 1998 and appear to have been taken in summertime. Data source: US Geological Survey. Online provider: Microsoft's TerraServer USA.