There are four forms of aerial photogrammetry surveying and mapping results. Why are there these four different forms of expression?

Aerial photogrammetry is a measurement method.

Different forms of surveying and mapping results are the products of this measurement method.

It may be more accurate to say so.

Why there are different forms of expression, mainly from product demand, some people need to do digital line drawing. For planning, design, route selection or construction, there are many technical means to obtain such drawings, and aerial photogrammetry is one of them, and it can also be collected on the spot. If someone wants to use the so-called orthophoto map in picture format as the background in order to establish a management information system, it can also be obtained through aerial survey.

There are many kinds of surveying methods and surveying and mapping results.

Corresponding to aerial photogrammetry, the main surveying and mapping products that can be produced are those forms.