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How to read topographic maps
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this post was submitted on 25 Nov 2023
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For the second one, do you need that many rings? Would using less still be correct?
Depends on the rest of the map. These are usually set up so the rings mean a certain consistent difference in elevation, say 1ft of 10ft. You don't normally change the spacing partway through the map. If the intervals were 10ft and this was a 20ft peak then you'd obviously have fewer rings than if the intervals were 1ft.
The rings are elevation placements. Less would be "correct in that they'd still signify elevations, it's just less detailed.
For example, the widest ring might be an elevation of 2470ft while the smallest ring might be 2570ft. If there are no rings in between, it's still correct, you're just not getting very detailed. You could easily be looking at a perfect sloap on all sides, like a smooth cone. But place 9 rings in between at 10ft more of elevation each, you've got a much more detailed idea of how a mountain or hill is shaped.
So, correct, but not very useful.
Utility may be subjective, but sloap perfection is forever.
“Fewer.”
rip stannus