Presented is a C++ Windows application that creates relief map images from high resolution 1 arc-second HGT files. The application was used to create the relief maps in my New Zealand Digital Elevation Model project.
The application expects a high resolution HGT file ( 1 arc-second ). These files are 3601 by 3601 and contain the height in meters stored as a 16 bit value. The output file is a 1200 by 1200 bitmap/jpg file containing the relief map. Relief maps allow the HGT data to be visualized more easily. For more information about HGT files see my other project.
Using the application
- Select an HGT file and press the "Create Relief Bitmap" button. A Bitmap image will be saved to a file with the same name as the HGT file and in the same directory.
- Optionally, an additional JPEG can be saved if the "Create additional JPEG" option is selected.
- Normal maps can also be created by pressing the "Create Normal Map" button. (I added this feature to help debug my HGT-CUDA project).
- To automatically create a Relief/Normal map for each file in the specified directory, select the scan folder option. This saves having to select each file in the directory one at a time.
- The cclour scale can be altered using the builtin editor.
Building the application
The project was written using Visual Studio 2019 (make sure the desktop C++ and MFC options are installed).
Credits
- The Vector SIMD code was copied from here.
- The colour map was inspired by 3dem application that apparently is no longer supported but an old version can be downloaded from here.
Sample Images
The image below shows a relief map of the Auckland Region S37E174.hgt
Rotorua S39E176.hgt.
Wellington/Queen Charlotte Sound S42E174.hgt.
Otago/Southland S47E169.hgt.
