I know similar questions have been asked about this already, but I would like to check something specifically... I have a copy of a published 1:1m map of Ivory Coast which states (in the legend) that it's projected in UTM30N, WGS 84. The problem I am wondering about is that the map spans zones UTM30N and UTM29N, so doesn't this mean that there is likely to be quite a lot of distortion across the map? Wouldn't lat-lon have been a more appropriate choice for such a map? I'm intrigued and would like to know what others think, because it's an official, published map and its authors must surely know more than I do about this!

closed as primarily opinion-based by Vince, Ian Turton Sep 1 '17 at 15:53

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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    No, a geographic coordinate system is not likely to be better than a projected CS for such a small area. Choice of projection is surely a jugement call on the part of the cartographer or mapping agency, but not something that be questioned in GIS SE, since it's too opinion-based to provide a correct answer. Once you have sufficient reputation you could ask this in our Geographic Information Systems Chat, though it's not a heavily utilized feature. – Vince Sep 1 '17 at 12:02
  • If you "know similar questions have been asked about this already" what were they? Please provide links to them. – PolyGeo Sep 1 '17 at 18:58
  • Opinion-based? 1. People like to measure in meters or feet rather than degrees and it's lot easier to measure distances or areas;. 2. Map scale is more consistent across the map than it would be in a GCS; 3. UTM conserves shapes/angles so data looks "better"; 4. Publisher? Some agencies just have a standard that UTM is used for almost everything. – mkennedy Sep 1 '17 at 20:24