Different colormaps and caxis on overlaying pcolorms
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Pavel Inchin
am 14 Aug. 2023
Kommentiert: Walter Roberson
am 18 Aug. 2023
Good day,
I need to overlay two different datasets through pcolorm on the same figure and map (scatterm could also work). For each of them I want to have different caxis and colormaps.
The simplest code I am playing with is this:
close all
figure
worldmap([-90 90],[-180 180])
pcolorm(1:1:70,1:1:70,0.1:0.1:7) % I want to have caxis([0 1]) for this pcolorm and parula
pcolorm(-70:1:0,-70:1:0,0:1:70) % I want to have caxis([0 70]) for this pcolorm and jet
Thank you in advance for any suggestions,
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Akzeptierte Antwort
Walter Roberson
am 15 Aug. 2023
Any one axes or mapping axes can only have one CLim property (the one affected by caxis), and can have only one color map.
pcolorm() and surfm() both return Surface objects. Surface objects accept RGB color data, so you can replace the color data with data that has been processed through rescale() to 0, 255, then uint8(), then ind2rgb() .
Note however that pcolorm() and surfm() require that the Z data be a grid that is length(lat) by length(long) . Your Z values, 0.1:0.1:7 is a vector not a 2D array, so it is not suitable for pcolorm() or surfm()
2 Kommentare
Walter Roberson
am 18 Aug. 2023
CLIM_FOR_FIRST = [2 6];
CLIM_FOR_SECOND = [5 64];
figure
worldmap([-90 90],[-180 180])
s1 = pcolorm(1:1:70, 1:1:70, 0.1:0.1:7);
r1 = rescale(s1.CData, 0, 255, 'InputMin', CLIM_FOR_FIRST(1), 'InputMax', CLIM_FOR_FIRST(2));
r1 = uint8(r1);
mm = jet(256);
r1 = ind2rgb(r1,mm);
s1.CData = r1;
s2 = pcolorm(-70:1:0,-70:1:0,0:1:70);
r2 = rescale(s2.CData, 0, 255, 'InputMin', CLIM_FOR_SECOND(1), 'InputMax', CLIM_FOR_SECOND(2));
r2 = uint8(r2);
mm = winter(256);
r2 = ind2rgb(r2,mm);
s2.CData = r2;
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