this post was submitted on 30 Jul 2024
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For example on wikipedia for Switzerland it says the country has an area of 41,285 km². Does this take into account that a lot of that area is actually angled at a steep inclination, thus the actual surface area is in effect larger than what you would expect when looking onto a map in satellite view?

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[–] snooggums@midwest.social 66 points 3 months ago* (last edited 3 months ago) (1 children)

Inclination must be ignored for area to work on a map, plus the inclination ends up being lost in the noise on a large scale. It is very similar to the coastline issue where the more detail you include the longer the coastline gets until every coastline is basically infinite.

Let's take an area split into a grid. One are has a hilly round slope, one is flat, and the rest are a variety of combinations. If you tried to take slope into account the one with the round hill would require the straight lines of the grid to warp towards it like one of those space time curvature pictures. The one that is flat is the only one that could be square, and even then it only works if you count it as flat since even flat ground has a small texture.

So no, they don't take elevation into account for maps because it would be far too difficult to measure.

The surface area can only be calculated with a defined level of accuracy due to how textured surfaces work.

[–] BlackLaZoR@kbin.run 14 points 3 months ago* (last edited 3 months ago)

This is the same problem as with coastline length - the higher resolution you'll use, the bigger the number you'll get. AFAIK this is solved by just standarization of calculation methods - there's just certain rounding to be applied in all cases so you get a comparable results