How to make a 2-D colormap with coordinates

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.

Answer 1

[andres]

Finally it was better to use scatter. Thank you very much anyway!

[madhan ravi]

you should accept the answer which was given by the person who helped you , that's a way of appreciating who helps

[jonas]

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]

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!

Answer 2

[jonas]

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]

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]

just set the view,

view([0 90])

or use one of the following functions with the same syntax as surf

• pcolor
• imagesc
• contourf
• mesh