How to project altitude values

Question

주영 2024-9-10，6:01

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https://ww2.mathworks.cn/matlabcentral/answers/2151514-how-to-project-altitude-values

回答： Dheeraj 2024-9-11，5:48

I know how to project latitude, longitude like the code below, but how can I project altitude values?

-code-

rrMap = roadrunnerHDMap;
p = readCRS(rrMap);
[x1,y1] = projfwd(p,latitue,longitude);

Just as projfwd is a function of projecting latitude-longitude coordinates into x-y map coordinates, I want to project altitude values into x-y map coordinates

May I know how?

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Jatin 2024-9-10，8:33

Hi @주영, you might want to have a look at this File Exchange: https://www.mathworks.com/matlabcentral/fileexchange/50704-getelevations-latitude-longitude-varargin?focused=3873861&tab=function

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Answer 1

Dheeraj 2024-9-11，5:48

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Hi 주영,

Projecting altitude values into a 2D map coordinate system is not as straightforward as projecting latitude and longitude. The projfwd function transforms geographic coordinates (latitude and longitude) into a 2D plane, typically ignoring the altitude or treating it as a separate dimension. However, altitude can be handled by incorporating it into a 3D coordinate system or by mapping it to a certain feature on your 2D map.

This can be done by Handling Altitude Seperately:

Color Coding: Use different colors to represent different altitude levels on your 2D map.
Contours or Elevation Lines: Draw contours to represent different altitudes.
Annotations or Labels: Add text annotations on your map to indicate altitude.