How can I plot an already georeferenced .tiff image in a map with long and lat?

Q&A
1

I have processed a .tiff image in Matlab and I would like to plot it with the coasts and the longitude and latitude grid. How can I do it using your program?

2

Hi Anna.

If your image is in long and lat, then you could treat it as a grid.

3

b_pictures_out_gulia_07_15_30_100.tif (228.0 KB)
my figure is in this way

4

You could try this:

gmt grdimage b_pictures_out_gulia_07_15_30_100.tif -Baf -png map

map
map1910×1456 147 KB

1 Like
5

super thanks

6

map.pdf (121.1 KB)
this is what i obtained by this code

gmt begin map 
# Visualizzare l'immagine raster della Sicilia
gmt grdimage b_pictures_out_gulia_07_15_30_100.tif -Cmy_palette.cpt -I+d -Q50 -R11.50894/15.77485/35.27988/39.50000 -JM5i

# Sovrapporre le linee costiere della Sicilia sull'immagine raster
gmt coast -R11.50894/15.77485/35.27988/39.50000 -Wthin  -JM5i -Bafg -W0.5p,black  -I1

gmt end

the .tiff is not in the correct position. How can move ?

7

You should not include a region (-R) in your coast command, because that will draw the coastline with a different region from your image.

8

That is not the problem here because the -R region is the same in the commands (though it should not be repaeted). The problem looks more on the -tif file that seems to have wrong coordinates.

9

the .tif file is an RGB image including the color bar

no wonder the coordinates are off

10

thanks you so much.
i try to fix the coordinates.