Specifying a colormap for values in an array

I am trying to plot some rain gauge data. There are 31 total rain gauges with rainfall totals in a 31x1 array. Each gauge has a Lat and Lon associated with it and the individual data sets are measured over 24hr periods. My issue is that I need to specify certain RGB triples for a specific value or a range of values. ie) orange would be mapped whenever a gauge records 60mm - 62mm of rain for any given day. I used the cmap function and found the colors are in a 64x3 matrix. I wanted to use a for loop to do this and this is the code I have.

 Lat = num(:,1);
 Lon = num(:,2);
 RNFL = num(:,3);

 cmap = colormap;

 for i = 1:RNFL(end)
    plot(Lon,Lat,'Color',[cmap(36,:)])
 end

The graph looks like this when plotted:

This is the code I used before and could generate the image below:

 Lat = num(:,1);
 Lon = num(:,2);
 RNFL = num(:,3);
 Min = min(RNFL);
 Max = max(RNFL);

 color = linspace(Min,Max,length(RNFL)); 
 scatter(Lon,Lat,20,RNFL,'filled')
 colorbar

The problem with this image is that the colors are not representative of the actual rainfall totals in the dataset.

[Walter Roberson]

Question: is it important to be able to have the data cursor show the original value, or could the data cursor show arbitrary integers?

[Brandon Bush]

I would rather have it show the original value

Answer 1

[Walter Roberson]

"I need to specify certain RGB triples for a specific value or a range of values. ie) orange would be mapped whenever a gauge records 60mm - 62mm of rain for any given day"

See https://www.mathworks.com/matlabcentral/answers/377542-how-can-i-change-number-on-colorbar-caxis#answer_300478 for what you have to do to create a colormap for your situation.