They are 6.83 inches apart on an airphoto. A vertical airphoto is taken from a flying height of 5000 ft relative to the ocean with a camera having a focal length of 6 inches. The flat surface is 1000 ft above sealevel. To appreciate how scale affects scene content, you may return to the various photos that we brought on-line in the previous page. The scale of each is printed alongside it.
Resolution has a popular meaning but is best defined in a technical sense.
We normally think of resolution as the ability to separate and distinguish adjacent objects or items in a scene, be it in a photo or real life. We specify the resolution in terms of the smallest features we can discriminate. But, contrast influences resolution. If two items are the same color, they may be hard to separate, but if they are sharply different in color, tone, or brightness, we can identify them more easily. Shape also is a factor.