![]() Options 1 and 4 requires a NASA Earth Data account to download data. These accounts are free but you need to register first before you can download data. NOTES: Some sources require an account to download data. QGIS with GDAL support can natively read the hgt files (as long as the file hasn’t been renamed)įor more information on SRTM, check out the resources linked below: *IMPORTANT: the name of the *.hgt file actually contains the source of the file’s georeferencing or coordinate system – DO NOT rename the file, otherwise it will not display properly For example, the file N45W122.hgt contains data from 45°N to 46°N and from 122☎ to 123☎ inclusive. The filename of the *.hgt file is labeled with the coordinate of the southwest (bottom left corner) cell. SRTM comes in either 1-arc second (30 meters) or 3-arc seconds (90 meters) and are divided into 1°×1° data tiles.ĭata downloads are distributed as a zipped file in *.hgt format. Version 1 is the semi raw data (which you do not want), version 2.1 is non-void filled, and version 3 (SRTM Plus) is void-filled. If you are not familiar with SRTM data, here are some quick notes on to keep in mind. This tutorial provides detailed instructions for option 4 which is using the SRTM downloader plugin directly in QGIS (version 3.22). Below are some options with some tips on downloading and using the SRTM data. There are various ways you can download this data. But for this tutorial I will show you how to generate contours from a publicly available DEM using QGIS.įor this tutorial, I am using a 30-meter (1-arc-second) SRTM DEM. I primarily use ArcGIS Pro at work to generate contours with ESRI provided terrain data or Lidar derived DEM. I often get asked to create contours from DEM for engineers and architects for site planning purposes.
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