How to use colormap?

I have do a color map for latitude, longitude and arsenic concentration data. Please help me in this regard. I have 2430 data for each variable

Answer 1

[KSSV]

use surf(lon,lat,data) where lon is your longitude matrix/ array, lat is latitude matrix/array and data is your arsenic concentration matrix.

Eg:

[X,Y,Z] = peaks(25);
surf(X,Y,Z);
colorbar

[MAITHILI MOHANTY]

Thanks! I have imported the excel sheet and created a .mat file which contains three variables(lat,long,conc) each 2429x1. But when i am using surf(lat,long,conc), error comes Z must be a matrix, not a scalar or vector. plz help in this regard.

[KSSV]

I already mentioned that ....conc must be a a matrix. Attach excel here..

[MAITHILI MOHANTY]

Please find the attached file..

Thanks