Changes between Version 10 and Version 11 of Help/DEM_scripts

Timestamp:

Feb 11, 2012, 2:03:16 PM (13 years ago)

Author:

adbe

Comment:

--

Help/DEM_scripts

@@ -55 +55 @@
     *  Select the purpose of the tile usage
     *  Then download the tiles.
-
+The files that are used for the elevation model are called ASTGTM*_dem.tif
 ==== Choosing Tiles ====
 When creating an ASTER DEM it is important to choose the correct tiles to use, as this could impact on the speed at which the script runs, as if tiles with large gaps between them are chosen when grass fills the nulls it has a lot of nulls to fill, so will take a very long time.
@@ -61 +61 @@
 If you require tiles in the region (50.23 - 52.56, -2.34 - 1.23) lat/lon:
   To calculate the tiles round the numbers down to get (50 - 52, -3 - 1), so you need:
-     ASTGTM2_N50W003_dem.tif
-     ASTGTM2_N50W002_dem.tif
-     ASTGTM2_N50W001_dem.tif
-     ASTGTM2_N50E000_dem.tif
-     ASTGTM2_N50E001_dem.tif
-     ASTGTM2_N51W003_dem.tif
-     ASTGTM2_N51W002_dem.tif
-     ASTGTM2_N51W001_dem.tif
-     ASTGTM2_N51E000_dem.tif
-     ASTGTM2_N51E001_dem.tif
-     ASTGTM2_N52W003_dem.tif
-     ASTGTM2_N52W002_dem.tif
-     ASTGTM2_N52W001_dem.tif
-     ASTGTM2_N52E000_dem.tif
-     ASTGTM2_N52E001_dem.tif
+     ASTGTM2_N50W003_dem.tif[[BR]]
+     ASTGTM2_N50W002_dem.tif[[BR]]
+     ASTGTM2_N50W001_dem.tif[[BR]]
+     ASTGTM2_N50E000_dem.tif[[BR]]
+     ASTGTM2_N50E001_dem.tif[[BR]]
+     ASTGTM2_N51W003_dem.tif[[BR]]
+     ASTGTM2_N51W002_dem.tif[[BR]]
+     ASTGTM2_N51W001_dem.tif[[BR]]
+     ASTGTM2_N51E000_dem.tif[[BR]]
+     ASTGTM2_N51E001_dem.tif[[BR]]
+     ASTGTM2_N52W003_dem.tif[[BR]]
+     ASTGTM2_N52W002_dem.tif[[BR]]
+     ASTGTM2_N52W001_dem.tif[[BR]]
+     ASTGTM2_N52E000_dem.tif[[BR]]
+     ASTGTM2_N52E001_dem.tif[[BR]]
   The name of the tiles relates to the bottom left corner of the region so ASTGTM2_N50W003_dem.tif covers (50-50.9999, 3-3.0001).
 
@@ -167 +167 @@
       -a:   Directory containing ASTER tiles only. If not given then script needs to be run within a project[[BR]]
       -g:   Grass database to use, defaults to creating one[[BR]]
-      -p:   Projection of output tiles:proj4 string or UTM[utm_num(zero padded)](N|S) or UKBNG or ll[[BR]]
+      -p:   Projection of output tiles: proj4 string or UTM[utm_num(zero padded)](N|S) or UKBNG or ll[[BR]]
       -r:   Resolution of output DEM, defaults to using resolution of ASTER tile[[BR]]
       -s:   binary geoid-spheroid seperation file[[BR]]
@@ -173 +173 @@
       -f:   Do not fill nulls or smooth, i.e. do not run the command r.fillnulls and r.neighbours on the DEM before outputting[[BR]]
 
-
+Examples:
+  *  Create an ASTER DEM from tiles in the directory aster_tiles and create an output file called a_dem_filename.dem:
+     *  {{{asterdem.sh -a aster_tiles/ -o a_dem_filename.dem}}}
+  *  Create an ASTER DEM jpg image from tiles in a directory:
+     *  {{{asterdem.sh -a aster_tiles/ -j a_dem_filename.jpg}}}
+  *  Project some ASTER tiles to a UKBNG projection and output the DEM to a_dem_filename.dem (Separation file uk_separation_file_WGS84LL.dem is used automatically):
+     *  {{{asterdem.sh -a aster_tiles/ -p UKBNG -o a_dem_filename.dem}}}
+  *  Project some ASTER tiles to a utm30n projection and output the DEM to a_dem_filename.dem:
+     *  {{{asterdem.sh -a aster_tiles/ -p UTM30N -o a_dem_filename.dem}}}
+  *  Project some ASTER tiles to a proj4 string projection:
+     *  {{{asterdem.sh -a aster_tiles/ -p "+proj=utm +zone=30 +ellps=WGS84 +datum=WGS84" -o a_dem_filename.dem}}}
+  *  Project some ASTER tiles to a proj4 projection using a separation file of your own making:
+     *  {{{asterdem.sh -a aster_tiles/ -p "+proj=utm +zone=30 +ellps=WGS84 +datum=WGS84" -o a_dem_filename.dem -s my_separation_file.dem}}}
+  *  Create an ASTER DEM in and leave it in a grass database and do not fill nulls or smooth the DEM:
+     *  {{{asterdem.sh -a aster_tiles/ -f}}}