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Originally Posted by RogerBW
Not exactly. I'm looking at statements like "The sea level in the Marineris between Eos and the locks (i.e. in Coprates/Melas) is set at 7.0 km above the lowest point on Mars." and wondering whether there's a bounding polygon defining "Marineris between Eos and the locks" within which I can tell my plotting routine "set the water level cutoff to this value rather than the standard".
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Well, you can see from the map that the locks are at 80°W/8°N and the Eos Dam is located at about 41°W/13°S. I didn't have a pinned down lat/lon in mind, IIRC those locations just seemed to make sense at the time given the topography.
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I was also hoping you might have a list of settlements with lat/long values which I could feed directly into the plotter...
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I don't, but again you can just eyeball them from the map. I'm sure not going to complain if they're in slightly different places on your own map ;).