Documenting the CIS/COD image format
A new web site has been set up to to document the CIS/COD raster image file format.
D-Sat
An endeavour to reverse-engineer the file format of D-Sat 1.
Latest posts
Solving a mystery (and finding something unexpected again)
We discover two different types of data in the last uncharted part of dsatnord.mp.
Fragmenting the tile data
Looking at some statistics about the structure of the tile data we learn something about the underlying wavelet compression.
Finding something unexpected again
To much surprise, content in a well-known file format is discovered while inspecting uncharted territories.
Documenting the file format
Using Kaitai Struct I can describe the file format and generate code and visualizations.
Visualising Entropy
Understanding how the tile index works and how tiles are arranged in the file.
Finding something unexpected
We find coordinates of highways and borders instead of tile coordinates.
Searching for the index
We visualise the parts which we have not decoded, yet.
Getting an overview on the file content
Putting the bits and pieces we know about the file together.
Visualising the tile size distribution
What's the size of tiles and how are they arranged in the file?