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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. 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). 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. 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 aws s3 cp s3://raster/SRTM_GL1/ . --recursive --endpoint-url https://opentopography.s3.sdsc.edu --no-sign-request
{{</ highlight >}} {{</ 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 ## Using raster2pgsql to import raster tiles into PostGIS
Now we have the data downloaded on our system, we can import it into our database. 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: 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! 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 #### 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 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