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DT1 Converter
DT1 files usually open only in GIS software. reaConverter reads them directly and converts whole folders into formats colleagues and clients can use.
How to Convert .dt1 Files in Bulk
1. Install reaConverter
2. Select DT1 Files
3. Start Conversion
Step by step
See It in Action
For quick and effortless DT1 file handling on your PC, reaConverter offers powerful conversion tools with batch processing. Best of all, it works entirely offline — ensuring your sensitive data never leaves your computer.
GIS Toolkit
Do more with your GIS data
Need DT1 data as something anyone can open? reaConverter renders imagery and elevation grids into standard images and documents without QGIS or ArcGIS, and works through whole folders in one pass.
- Render imagery, elevation grids and scanned charts to TIFF, PNG, JPG or PDF
- Resize, crop and set DPI on the output in the same run
- Bring tiles, scenes and grids from many sources into one consistent format
- Convert incoming survey and field data automatically with Watch Folders
- Script GIS conversions from the command line for pipelines and scheduled jobs
- Keep cadastral, utility and client data on your PC: nothing is uploaded
User reviews
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Average User Rating:Last updated on July 28, 2026
Questions & Answers
DT1 files: Frequently Asked Questions
What are DT1 files?
DT1 (DTED Level 1 Elevation Raster) is a binary grid format that stores terrain heights for a one-degree geographic cell at a 3 arc-second post spacing, which yields a 1201 by 1201 matrix in low-latitude cells. The file contains an 80-byte User Header Label ("UHL"), a 648-byte Data Set Identification record ("DSI"), and a 2700-byte Accuracy Description record ("ACC"), after which each meridian column forms its own data record: a 0xAA sentinel, a block counter, longitude and latitude indices, the elevation samples, and a four-byte checksum. To keep cells roughly square on the ground, the east-west interval grows with latitude through five zones, from 3 arc-seconds near the equator to 18 arc-seconds near the poles, so higher-latitude cells hold fewer columns. Samples are big-endian 16-bit values in sign-magnitude form, with -32767 as the void marker. Rasterization requires decoding the sign-magnitude numbers, reversing the west-to-east, south-to-north order into a top-down image, and filling or masking voids. Heights are then scaled to a grayscale heightmap, colored with a hypsometric palette, or shaded as relief for PNG, JPEG, or TIFF, while GeoTIFF keeps the real values and extents. Global Mapper, QGIS, ArcGIS, ENVI, and Manifold GIS read this format.
Can reaConverter open DT1 files?
reaConverter fully supports the DT1 file format – open, edit, and export DT1 files to any other popular file format with ease.
Do I need QGIS or ArcGIS to convert DT1 files?
No. reaConverter reads DT1 files on its own, so the conversion needs no GIS installation and no licence. It handles whole folders at once, which suits survey archives, tile sets and data deliveries that have to reach people working in other software.
How do I change DT1 to another format?
reaConverter is a user-friendly tool for converting DT1 files. Once installed on your computer, it allows you to convert all your .dt1 files at once with just a few clicks. You can even convert dt1 images directly from Windows Explorer using the right-click menu — fast and convenient.
Why choose offline conversion with reaConverter?
Keep your sensitive data 100% private with offline processing that never exposes files to cloud risks. Our software meets strict compliance standards (GDPR, HIPAA, CCPA) while handling confidential documents for legal, healthcare and financial sectors.
Can I convert DT1 online?
If you only want to convert a few DT1 files, you are welcome to try our free online DT1 converter.
How can I turn DT1 files on my computer to another format?
The best way to convert DT1 files on your PC is to get a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch files conversions, including conversion from DT1.
How can I automate DT1 files conversion?
reaConverter supports all the essential automation features, such as right-click сonversion and Watch Folders, for the most efficient automated file conversion in any software of its kind.
Can I convert DT1 files using scripts or the command-line interface?
reaConverter provides full access to all its features from the Windows command-line shell, including the command-line dt1 converter.
What else can I do with reaConverter?
Convert CAD formatsSet file dateConvert raster to vectorSet picture bit depthConvert PDF
What formats can I convert a DT1 file to?
Discover More
Beyond DT1 conversion
Convert .dt1 files in batches of any size, with editing and processing applied along the way. The same tool also handles 800+ other formats, including CAD, medical imaging, and GIS.
