What is a DTM file?
A .DTM file is most often a Digital Terrain Model. These files store 3D topographic data. GIS professionals use them to model the surface of the Earth. Software from RIB Software, Nemetschek, and Teledyne often create these files.
However, the .DTM extension has several other uses. It can be a paper list file compressed as a .ZIP archive for PrintPlus. It can also store 3D game models for the Vangers game engine, or tool-assisted speedrun (TAS) movies for the Dolphin Emulator.
How to open DTM files?
To open a Digital Terrain Model, you normally need specialized GIS software. Programs like Global Mapper by Blue Marble Geographics or Teledyne PDS2000 can read these files. If your file is a Dolphin TAS Movie, you must load it into the Dolphin Emulator.
Because the .DTM extension has multiple possible meanings, it is often hard to know which software to use.
Inspect and identify your file
If you are unsure what your file contains, viewer.online/dtm can analyze .DTM files to identify the exact format and creator software. It allows you to inspect the file structure, extract readable text, and check whether an online preview is available.
Best practices and conversion
If you work with GIS data, you might need to convert your file to a more common format. We recommend file conversion to sensible target formats on convert.guru. You can often convert a .DTM file to .DEM, .XYZ, or .OBJ for better compatibility with standard 3D software.
Summary
In short, viewer.online/dtm is useful for identifying, inspecting, and understanding .DTM files without installing software or dealing with compatibility problems. It helps you quickly discover if your file is a terrain model, a game asset, or an emulator recording.