https://community.esri.com/t5/developers-questions/difference-between-arcgis-elevation-and-srtm/m-p/1657270#M7613 <P>ArcGIS Qt SDK Version 100.14.1</P><P>When fetching elevation from ArcGIS's "WorldElevation3D/Terrain3D/ImageServer" server there is a difference between this elevation and open source SRTM (HGT file) elevation.&nbsp;</P><P><BR />I have tried using&nbsp;<EM>RasterElevationSource&nbsp;</EM>to manually set my HGT file as elevation source. While it is able fetch elevation data from file, the values still differ.</P><P><BR />I verified elevation values using QGIS. For example, at coordinates '<EM>34.461458, 77.621044</EM>' ArcGIS show elevation of 4370m while QGIS shows elevation of&nbsp;4376.9m. Sometimes the difference is minor (2–5m), but other times it can be as much as 20–30m.<BR />I have also tried fetching elevation like mention <A href="https://stackoverflow.com/questions/16297540/how-to-read-hgt-files-in-c" target="_self">here</A> and it returns the same elevation as QGIS.</P><P>Can anyone explain why ArcGIS provides different elevation values compared to the actual elevation from SRTM? And how to get exact elevation like QGIS?</P><P>&nbsp;</P><P>SRTM File can be downloaded from <A href="https://terrain.ardupilot.org/SRTM3/" target="_self">here</A>.</P> Sat, 11 Oct 2025 05:08:37 GMT YogeshPandey 2025-10-11T05:08:37Z https://community.esri.com/t5/developers-questions/difference-between-arcgis-elevation-and-srtm/m-p/1657270#M7613 <P>ArcGIS Qt SDK Version 100.14.1</P><P>When fetching elevation from ArcGIS's "WorldElevation3D/Terrain3D/ImageServer" server there is a difference between this elevation and open source SRTM (HGT file) elevation.&nbsp;</P><P><BR />I have tried using&nbsp;<EM>RasterElevationSource&nbsp;</EM>to manually set my HGT file as elevation source. While it is able fetch elevation data from file, the values still differ.</P><P><BR />I verified elevation values using QGIS. For example, at coordinates '<EM>34.461458, 77.621044</EM>' ArcGIS show elevation of 4370m while QGIS shows elevation of&nbsp;4376.9m. Sometimes the difference is minor (2–5m), but other times it can be as much as 20–30m.<BR />I have also tried fetching elevation like mention <A href="https://stackoverflow.com/questions/16297540/how-to-read-hgt-files-in-c" target="_self">here</A> and it returns the same elevation as QGIS.</P><P>Can anyone explain why ArcGIS provides different elevation values compared to the actual elevation from SRTM? And how to get exact elevation like QGIS?</P><P>&nbsp;</P><P>SRTM File can be downloaded from <A href="https://terrain.ardupilot.org/SRTM3/" target="_self">here</A>.</P> Sat, 11 Oct 2025 05:08:37 GMT https://community.esri.com/t5/developers-questions/difference-between-arcgis-elevation-and-srtm/m-p/1657270#M7613 YogeshPandey 2025-10-11T05:08:37Z