The File Extensions Database

.HGT File Extension

  • Category: GIS Files
  • Format: Binary

What is an .HGT file?

.HGT is SRTM Elevation Data File

GIS data file stored in the Shuttle Radar Topography Mission (SRTM) format; contains global elevation data captured during NASA space missions; may include up to a one arcsecond resolution; used for analyzing the earth's topography and for generating topographical images.

Some data in the original SRTM dataset is missing due to limits of the space missions. These areas are referred to as "voids." Efforts have been made to fill in the missing gaps using interpolation methods. For example, the National Geospatial-Intelligence Agency (NGA) created the "Version 2" and "Version 2.1" datasets, which include modified data. Therefore, some downloaded HGT files may include interpolated data.

HGT files are named with longitude and latitude coordinates. For example, N00W177.hgt contains data for one degree of latitude (00-01 North) and one degree of longitude (177-178 West).

NOTE: The "HGT" extension is an abbreviation for "height."

Programs that open SRTM Elevation Data File
Safe Software FME Desktop
ESRI ArcGIS for Desktop
DG Terrain Viewer
DG SRTM Void Killer
DG Terrain Viewer

How to solve problems with HGT files

  • Associate the HGT file extension with the correct application. On :
    Windows: Right click on any HGT file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.HGT files". Mac: Right click (or Ctrl-click) the HGT file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .HGT is SRTM Elevation Data File. Because only the current version supports the latest HGT file format. Search, therefore, e.g. on the N/A manufacturer website after an available .HGT is SRTM Elevation Data File update.
  • To make sure that your HGT file is not corrupted or virus-infected, get the file again and scan it with antivirus software.