dcw-gmt: 2.1.2 -> 2.2.0 and switch to github (#446740)

pkgs/by-name/dc/dcw-gmt/package.nix

@@ -1,15 +1,18 @@
 {
   lib,
   stdenv,
-  fetchurl,
+  fetchFromGitHub,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "dcw-gmt";
-  version = "2.1.2";
-  src = fetchurl {
-    url = "ftp://ftp.soest.hawaii.edu/gmt/dcw-gmt-${finalAttrs.version}.tar.gz";
-    sha256 = "sha256-S7hA0HXIuj4UrrQc8XwkI2v/eHVmMU+f91irmXd0XZk=";
+  version = "2.2.0";
+
+  src = fetchFromGitHub {
+    owner = "GenericMappingTools";
+    repo = "dcw-gmt";
+    tag = finalAttrs.version;
+    hash = "sha256-OgFonNbhvzRfQZksnwIbgASbMGnL0bmD4wkXZBl3kIU=";
   };
 
   installPhase = ''
@@ -18,16 +21,20 @@ stdenv.mkDerivation (finalAttrs: {
   '';
 
   meta = with lib; {
-    homepage = "https://www.soest.hawaii.edu/pwessel/dcw/";
+    homepage = "https://github.com/GenericMappingTools/dcw-gmt";
     description = "Vector basemap of the world, for use with GMT";
     longDescription = ''
-      DCW-GMT is an enhancement to the original 1:1,000,000 scale vector basemap
-      of the world, available from the Princeton University Digital Map and
-      Geospatial Information Center. It contains more state boundaries (the
-      largest 8 countries are now represented) than the original data
-      source. Information about DCW can be found on Wikipedia
-      (https://en.wikipedia.org/wiki/Digital_Chart_of_the_World). This data is
-      for use by GMT, the Generic Mapping Tools.
+      The Digital Chart of the World is a comprehensive 1:1,000,000 scale vector
+      basemap of the world. The charts were designed to meet the needs of pilots
+      and air crews in medium- and low-altitude en route navigation and to
+      support military operational planning, intelligence briefings, and other
+      needs. For basic background information about DCW, see the [Wikipedia
+      entry](http://en.wikipedia.org/wiki/Digital_Chart_of_the_World).
+
+      DCW-GMT is an enhancement to DCW in a few ways:
+
+      - It contains more state boundaries (the largest 8 countries, Great Britain and Norway are now represented).
+      - The data have been reformatted to save space and are distributed as a single deflated netCDF-4 file.
     '';
     license = licenses.lgpl3Plus;
     maintainers = with lib.maintainers; [ tviti ];