This is a gallery of bridges from the November 2, 1982 landsat 4 image of central Maryland and northern Virginia. This gallery is not complete but gives a representative example.
All bridges are shown to the same scale, allowing them to be directly compared with each other.
Each image shows every pixel. The size and full image coordinates for the upper left corner are shown for each image. The full image coordinates range from 0 to 7167 in X and 0 to 5971 in Y where Y=0 is the top line in the full image.
Assuming square pixels, measurement on a map gives a pixel size of 28.5 meters, close to the stated 30 meter pixel size (this is from a careful measurement, but is not guaranteed for any significant purpose. Check this for yourself if you really need it). This is 35.09 pixels per km, and 56.47 pixels per mile.
(based on 28.5 meter pixels)
Bay Bridge, 316 x 125 at 4463,2241
Frances Scott Key Bridge, 176 x 177 at 3934,1448
Dc Bridges , 150 x 108 at 2610,3082
Wilson Memorial Bridge, 138 x 77 at 2730,3413
Senator Frederick J Malkus Jr Bridge, 149 x 157 at 5807,3641
Governor Johnson Memorial Bridge, 135 x 98 at 4756,4906
Governor Harry W Nice Memorial Bridge, 190 x 114 at 3114,5039