Planimetrics is the study of plane measurements, including angles, distances, and areas.
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History
To measure planimetrics a planimeter is used. This rather advanced analog technology is being taken over by simple Image Measurement software tools like, ImageJ, Adobe Acrobat, Google Pro Earth, Gimp, Photoshop and KLONK Image Measurement which can help do this kind of work from digitalized images.
In geography
Planimetric elements in geography are those features that are independent of elevation, such as roads, building footprints, and rivers and lakes. They are represented on two-dimensional maps as they are seen from the air, or in aerial photography. These features are often digitized from orthorectified aerial photography into data layers that can be used in analysis and cartographic outputs.
A planimetric map is one that does not include relief data.