Slope is shown on a map usually by contours being closely spaced, or by arrows shown along roads in some cases. Contours can sometimes obscure map features in some cases.
An alternative approach I have used to produce, is to colour-code both elevation and slope simultaneously in different colour channels.
In the cases below, I have used the blue band for elevation, and red for slope. Since I intended this as a map for cycling I have named the different scalings after professional cyclists.
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| Elevation shading colour codes elevations from 0-150m above sea level in the blue channel, and slope values from 0-10 degrees (up to 22.5%) in red. This map is optimised for lowland areas, however at higher elevations the direction of elevation change is no longer clearly shown on this map. |
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| Elevation shading colour codes elevations from 50-400m above sea level in the blue channel, optimising the map to show elevations in the higher part of the range. Slope values are shaded from 0-10 degrees (up to 22.5%) in the red channel as earlier. |
I give a few more examples of this using a different slope scaling and downloads of larger image files on my website.
If you don't mind the asking .... How did you obtain the road slope gradient in the end ? Or is this slope for the land itself ? (In geomorphons maybe?)
ReplyDeleteThis is still just the slope, not the slope along the road. I keep meaning to work on that, but then I also want to do a bit more on the Cornish language processing stuff, and I do want to get back to Mars as well soon.
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