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Sam 2024-08-13 18:57:54 +01:00
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@ -24,7 +24,7 @@ The final image looks like this:
It's possible to download the entire SRTM (Shuttle Radar Topography Mission) satellite imagery dataset and insert it into a Postgres database for personal use. This can be helpful for if you need global elevation data for your analysis and don't want to be limited by third-parties APIs.
The SRTM is a near-global dataset of elevation data with a resolution of 1-arc-second (30m). More information is available from [USGS](https://www.usgs.gov/centers/eros/science/usgs-eros-archive-digital-elevation-shuttle-radar-topography-mission-srtm?qt-science_center_objects=0#qt-science_center_objects).
In this guide we will go through downloading the data, inserting it into a Postgres database with PostGIS, then querying the final result to create a DEM for any country or region.
In this guide we will go through the process of downloading the data, inserting it into a Postgres database with PostGIS, then querying the final result to create a DEM for any country or region.
This guide assumes you are using Linux (this may also apply to other Unix like systems such as MacOS) and have a Postgres database with the PostGIS extension installed. More information on how to do this can be found on the [PostGIS](https://postgis.net/documentation/getting_started/) website.
@ -51,6 +51,8 @@ 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/).
## Using raster2pgsql to import raster tiles into PostGIS
Now we have the data downloaded on our system, we can import it into our database.
If we look inside the SRTM_GL1_srtm directory, we can see all of the 14280 raster files:
@ -218,7 +220,7 @@ vacuum analyze "dem"."singapore_srtm";
Looks much better!
This DEM raster of Singapore is available for download from our downloads page [here](/data-downloads/singapore-srtm)
This DEM raster of Singapore is available for download from the downloads page [here](/data-downloads/singapore-srtm)
#### Citations
NASA Shuttle Radar Topography Mission (SRTM)(2013). Shuttle Radar Topography Mission (SRTM) Global. Distributed by OpenTopography. https://doi.org/10.5069/G9445JDF. Accessed: 2024-08-06