How can I modify Basemap GSHHS_f.dat?

worldho42@...32... wrote:

Dear Jeff.

I'd like to modify or create gshhs_f.dat, gshhsmeta_f.dat using gshhs_f.b

It takes long time to show full resolution basemap, and I want just a small_specific area.

How can I modify basemap map data file?

Any help would be appreciated.

You can't modify that file - but if you can find an ESRI shapefile that has the coastlines for just the area you're interested in you can use that.