Guide-to-process-high-resolution-topography-(30-m)-from-SRTM-for-WPS.md

+1.	**Download data using the QGIS plugin STRM-Downloader**
+
+Set the coordinates of your 1km domain and activate “Load Images to QGIS”. You need to register to [NASA Earth Data](https://www.earthdata.nasa.gov/) and sign in with your username and password.
+
+2.	**Merge the tiles, crop, and download as GEOTIFF**
+
+-	To merge the tiles go to `Raster – Miscellanious - Merge`, select the layers and run.
+-	To crop go to `Raster – Extraction – Clip Raster by Extent` and select the coordinates to crop. Let 0.1 degrees more than the simulation area.
+-	To save right click on the cropped layer and `Export – Save as`, select format GeoTIFF and save the file.
+
+3.	Install (if not done yet) and run `convert_geotiff`
+
+-	Install first the geotiff development libreries:
+sudo apt-get install libgeotiff-dev
+-	Download convert_geotiff from here: https://github.com/jbeezley/convert_geotiff/releases and install:
+```
+./configure && make
+```
+-	Run convert_geotiff:
+```
+./convert_geotiff -w 4 -t 1200 -u “meters MSL” -d “Topography height” [cropped geotiff FILE]
+```
+
+4.	**Within the directory you have the default WRF terrestrial dataset, create a new folder and name it STRM_topo_1s (or whatever you desire).**
+
+5.	**Move the data tiles __convert_geotiff__ generated in the directory you previously created**
+
+6.	**Modify GEOGRID.TBL**
+-	Look for variable HGT_M and add the following lines at the appropriate places:
+```
+interp_option= topo_1s: average_gcell(4.0)+four_pt+average_4pt
+rel_path= topo_1s: STRM_topo_1s (or whatever the name of your directory (4) is)
+```
+
+7.	**Modify namelist.wps**
+
+-	Add to the desired domains: `geog_data_res = 'topo_1s+modis_15s_lake'`
+
+
+NOTES: Based on https://wrfexplorer.wordpress.com/2015/03/24/high-resolution-topography/
+