creating a polygon border from binary file
I have an xyz geographical file file1.xyz where x is lon,y is lat and z values are 1 and 0. I turned it into a grid file1.nc using xyz2grd.
The areas where z=1 are my interest areas. I would like to have polygon files that contain only the points on the border of each interest area. So not all the points where values z=1 (not sites inside the interest area), only those that are on the edge of the areas. Is it possible to do that?
Please post on the GMT forum at www.generic-mapping-tools.org instead.