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Affect of projection on topographic profiles

June 25 2009 | 0 comments
Categories: ArcGIS Methods

I am about to make many topographic profiles on a map using ArcGIS 9.2. The area of interest is on the scale of one hemisphere (on the moon). Does the projection matter when creating topographic profiles or will the program account for the projection type? We are currently using "the world from space" orthographic projection with a chosen center point and the "moon 2000" geographic coordinate system. It is my understanding that with this chosen projection (the world viewed from space) that the distortion increases as you move away from the center point until the distances at the outer edges are essentially zero. Will the interpolate line tool that I use for creating the profiles automatically account for or fix this distortion? Or would a different projection be better to use for this particular application?
Thank you for your time.

Mapping Center Answer:

Using the World from Space as the display, with the moon GCS, the "distance" shown at the edges would definitely compress more and more to compensate for the curvature of the moon, until the display reaches the horizon and disappears "around the edge" so to speak. The effect on your profile would depend on what you are trying to do. Are you creating something like USGS topo quads, or trying to display topography of an entire hemisphere at once to minic what we would see looking a the full moon from earth? If you can give us a bit more detail, we can try to help some more.

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