| Each enlargement shows an area where a photo identifiable
ground control point is required. A suggested control point is indicated
and described. We try when possible and practicable to select points
which can be directly occupied by GPS survey equipment. If the suggested
point is not recoverable (moved, destroyed) you must select an alternate
point. The alternate must be visible in the image and away from
overhanging trees or tall buildings, to insure that it can be seen in
the matching stereo image. Preference is given to well defined points on
hard surfaces, such as catch basins and pavement stripes. Refer to our
website for more examples of photo identifiable
points and survey
technique. |
