Merge branch 'master' of git.bitlab21.com:sam/baseddata.io

content/blog/batch-import-postgis-rasters.md

@@ -51,7 +51,7 @@ Next we can run the following command to download the rasters. This will take so
 aws s3 cp s3://raster/SRTM_GL1/ . --recursive --endpoint-url https://opentopography.s3.sdsc.edu --no-sign-request
 {{</ highlight >}}
 
-If you'd prefer to download specific rasters or rasters for a region instead, you can checkout this [website](https://dwtkns.com/srtm30m/).
+If you'd prefer to download specific rasters or rasters for a region instead of downloading them all, you can select regions for download from the OpenTopography [website](https://portal.opentopography.org/raster?opentopoID=OTSRTM.082015.4326.1) using the interactive map.
 
 ## Using raster2pgsql to import raster tiles into PostGIS
 Now we have the data downloaded on our system, we can import it into our database.
@@ -98,9 +98,9 @@ So we have just over 12 million 128x128 tiles in the database.
 
 ## Raster Clipping
 
-Now we have global SRTM data loaded in our local database, we can extract any of the tiles for further analysis and access this using any application. 
+Now we have global SRTM data loaded in our local database, we can extract the tiles we want for further analysis. 
 
-Here I'll demonstrate using the following PostGIS commands: `st_clip`, `st_intersects` and `st_union` to create a digital elevation table for singapore and access this from from within QGIS.
+Here we'll create a digital elevation raster for Singapore to demonstrate using the following PostGIS commands: `st_clip`, `st_intersects` and `st_union`, then import this into QGIS to style and visualise the results.
 
 I already have countries vector data in my Postgres database that I extracted from OpenStreetMaps. You can download a pg_dump of this [here](/data/countries.sql) to insert into your database. Alternatively, I have a post [here](/blogs/import-osm-countries-data) that explains the process to do this manually.