How can I run a median/low-pass filter over a Digital elevation model data in XYZ format

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NS
NS 2019-8-1
回答： Shashwat Bajpai 2019-8-5
Hi,
I want to run a median/low-pass filter (over several hunders kilometers) over a Digital Elevation Model data which in XYZ format.
X is lon
Y is lat and
Z is the elevation.
Could you please point me in the right direction?
Thanks in advance

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回答（1 个）

Shashwat Bajpai
Shashwat Bajpai 2019-8-5
Hi,
I would try the following functions:
  • fir1
  • medfilt2
  • fspecial and imfilter
A similar question has steps on how to use the last two functions. You can refer to the following link for the question:
https://www.mathworks.com/matlabcentral/answers/350550-how-can-i-run-a-low-pass-filter-over-a-digital-elevation-model-to-reduce-noise
For further help on fir1 and medfilt2 refer the following links:
https://www.mathworks.com/help/signal/ref/fir1.html
https://www.mathworks.com/help/images/ref/medfilt2.html

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