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

Question

PARIVASH PARIDAD 2019-8-7

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评论： Anna S 2020-8-28

Plot.xlsx

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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darova 2019-8-10

Maybe plotm() or scatterm()?

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Answer 1

Chad Greene 2019-8-9

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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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Anna S 2020-8-28

Ah okay, so probably that is the problem of my dataset, because the interpolation of non-equally spaced and 'randomly' distributed grid points causes an error in creating the 'interpolated grid'.

Thanks!

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