# How can I get slope from DEM data?

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HyoJae Lee on 2 Mar 2021
Edited: HyoJae Lee on 3 Mar 2021
Hi, I'm undergraduate student from Yonsei University, Seoul. I have a question about MATLAB.
I have a DEM data like this picture.
Each row and column indicates the length of data set(1952X2101), and each value means elevation.
If I put random radial degree like 45 degree(0-90 degree), MATLAB shows slope like 0.08 (in ratio)
How can I make this one?
HyoJae Lee on 3 Mar 2021
Edited: HyoJae Lee on 3 Mar 2021
Oh, I was totally wrong. Sorry, It is 1.697056...
I calculated slope by y's rate of change / x's rate of change.
y can be 1 2 4 8 10.
and x is row(or column) number 1 2 3 4 5 * square root 2. (In 45 degree, data length of each point will be increased by square root 2)
I want to get the entire radial slope, not just two points, which has starting point of (1,1).
This picture might help. (This picture is visualization of the matrix.)
Thanks for helping me.

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