Figure 1. Paint TerraService Aerial Photos on a Windows Form. This 640-by-480-pixel photo image of San Francisco at the default 16 meter/pixel scale from Microsoft Research's 3.5 TB TerraServer database requires assembling 15 200-by-200-pixel tile bitmaps. The white gridlines show tile boundaries; the Navigate menu lets you relocate the centerpoint by one tile in cardinal directions. TerraService images courtesy U.S. Geological Survey.