# 2.4	Extraction of Elevation Profile using SRTM or ASTER DEM

2.4.1 Stepwise Process Flow Details

  
\- Step 1: Install the SRTM Downloader Plugin  
o Open QGIS.  
o Go to the Plugins menu.  
o Select "Manage and Install Plugins."  
o In the Plugins dialog, search for "SRTM Downloader."  
o Click on the plugin and then click the "Install Plugin" button to install.

\- Step 2: Access the SRTM Downloader Plugin  
o Once the plugin is installed, you should see a new menu item called "SRTM Downloader" in the QGIS toolbar.  
\- Step 3: Define Study Area  
o Zoom in to your study area in QGIS using the zoom and pan tools.  
o Use the rectangle or polygon selection tool to define the area you want to download the SRTM data for. You can find these selection tools in the QGIS toolbar.

\- Step 4: Run the SRTM Downloader Plugin  
o Click on the "SRTM Downloader" menu in the QGIS toolbar.  
o Login using the Earthdata user account.  
o In the SRTM Downloader dialog, choose the output folder where you want to save the downloaded data.

\- Step 5: Start the Download  
o Click the "OK" button to start the download process. The plugin will automatically download the SRTM data for the defined study area.

- Step 6: Process the Downloaded Data  
    o Once the download is complete, the SRTM data will be available in the output folder you specified.  
    o You can now use the downloaded SRTM data for your analysis in QGIS.

2.4.2 Output Illustrations

![](https://resources.imis.gwsc.ait.ac.th/uploads/images/gallery/2025-03/embedded-image-7yoijz3n.png)

Figure 6 Illustrations of extracted elevation profile, Ranchi (India)  
Source – CWIS spatial analysis, Innpact Solutions and GWSC