Alas, it takes a _very_ long time (hours to _days_) to import the OSM data, especially from the bzipped XML format. Part of the issue is that the OSM database is structured optimally for a DB (what they call "normalized"). The YAAC importer deliberately de-normalizes the data for efficiency in rendering, which requires huge temporary datafiles (in excess of 48GB) to hold all the OSM Node lat/lon values for easy access in putting those values directly into OSM Way objects instead having to convert Node IDs to lat/lon at render time. Note this code is optimized for whole-planet imports, so it wastes a _lot_ of temporary disk space when doing a subset import.

How exactly did you stop the import? If you use the Cancel button on the import progress dialog window, the importer will delete all its temporary files as part of import termination, but even that could take several minutes, depending on the speed of your filesystem and the number of tile-specific temporary files that need to be cleaned up. If you just shut down YAAC, the importer won't get a chance to delete the temporary files.

The temporary files are located in your YAAC tile file directory (by default, ${HOME}/YAAC/tiledir [where ${HOME} is your user-specific home directory] unless you used the expert-mode Configuration dialog to put it somewhere else). Any file in that directory or its latitude-specific subdirectories ending in .tmp (temporary data files) or .log (importer progess log) can be safely deleted (unless an import is currently in progress, of course). Alternatively, you could just start another import (which cleans up any stale temporary files before starting over) and immediately Cancel it properly so it can clean up the few new temporary files.

Due to the pain of importing OSM data, I make a copy of my whole-planet data available on my website, so you can download already-imported OSM data directly into YAAC without having to run the importer yourself. Go to File->OpenStreetMap->Download Pre-imported Tiles choice, and choose the geographical area you want to download. However, due to troubleshooting a new unreleased feature in the importer, I haven't updated my website's map tiles since November 2022. So the data is available, but won't have any OSM changes or additions since November.

Hope this helps.

Andrew, KA2DDO

author of YAAC

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Hello everybody,

I am a new user and had a problem when installing maps.?
I have YAAC installed on my Windows 10 machine since 2017, but I never used it. Yesterday I decided to configure it and to download the OSM maps
for Italy (.bz2 file about 3.1 GB). I had 190 GB of disk free space.?

After 8 hours in the process of installing the maps in YAAC I decided to cancel the operation, assuming that something wasn't working properly.
The final result is that now I have only 137 GB of free disk space! 53 GB have disappered.

Where the space was eaten up? I checked in the obvious places but I could not find any files so large.?
Any suggestion ?

73 Giovanni?