# How to make a 2-D colormap with coordinates

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andres on 22 Oct 2018
Commented: andres on 25 Oct 2018
Hi. I have n points, for each point I have its latitud, longitude and an indicator that take real values (from 0.5 to 2.7). I would like to make a Figure (like a colormap) that shows with colors the value of this indicator for each of these n points. Is that possible? Thanks in advance for any help.

andres on 25 Oct 2018
Finally it was better to use scatter. Thank you very much anyway!

madhan ravi on 25 Oct 2018
you should accept the answer which was given by the person who helped you , that's a way of appreciating who helps
jonas on 25 Oct 2018
That's fine! If he found a better solution then it's better to accept that one, as it may help others find the best solution in the future :)
Upon re-reading the question, I don't know why scatter was not my go-to suggestion.
andres on 25 Oct 2018
That is what I thought. Of course I appreciate the help (and I thanked in the original answer), but if someone has the same question in the future, it is better for him/her to know which solution was the one that worked for me better. Regards!

jonas on 22 Oct 2018
Edited: jonas on 22 Oct 2018
Use a surface object
surf(lon, lat, z)
The data must be gridded, so you may have grid the data like this
[LON,LAT] = meshgrid(min(lon):max(lon), min(lat) :max(lat))
Z = griddata(lon,lat, z, LON, LAT)
surf(LON, LAT, Z)

andres on 22 Oct 2018
But "surf" makes 3-D images, doesn't it? I need it to be 2D (sorry I did not put that in the text, but only in the title). As points come from geographical data (lon lat), I want a "map" representation with colors indicating the value of z.
jonas on 22 Oct 2018
just set the view,
view([0 90])
or use one of the following functions with the same syntax as surf
• pcolor
• imagesc
• contourf
• mesh

R2015b

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