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How to plot geographical values against a parameter in a color map graph

Asked by PARIVASH PARIDAD on 7 Aug 2019
Latest activity Commented on by darova
on 10 Aug 2019
I have a excel file consisting of 4 columns. The first column is the sample number. The 2nd and 3rd are the geographical lat/long. The last column is the moisture values.
I need to plot a graph that shows the moisture of these points in a form of a color map. I attach my file. Can anyone help me? Thanks

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Maybe plotm() or scatterm()?

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1 Answer

Answer by Chad Greene
on 9 Aug 2019

Parivash,
The first step is importing the data into Matlab. Unfortunately the lat and lon data are in degrees-minutes-decimal-seconds format, so xlsread might have some trouble with it. Maybe try removing all the degree symbols and import as space-delimited columns.
The next step is converting the dms format to decimal degrees, which you can do with dms2degrees if you have the Mapping Toolbox, or you can convert manually just by adding up the fractions of a degree and the fractions of a minute.
Then you'll have lon and lat in decimal degrees, and corresponding moisture values m. You can plot this as a color-scaled plot with the scatter function like
scatter(lon,lat,30,m,'filled')
and if you'd like to change the colormap you might like the cmocean rain colormap for moisture.

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