Mangled elevation data in Sarek

Ingvar Stepanyan shared this problem 20 days ago
Solved

There is a vertical (north-south) band of mangled elevation data in Sarek, particularly visibly protruding when used for map shading.

Replies (7)

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Hm, did my screenshot not attach? Trying again.

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Dear Ingvar,

thank you for the report. We have corrected the data, and the updated elevation files for hillshading are now available for download.

Unfortunately, there is currently no mechanism to remove previously downloaded elevation data from the device. Re‑downloading simply skips files that are already stored on the phone.

There is a workaround: reinstalling the app - but please note that this will delete all Locus stored data.

Regards, Petr

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Can the elevation data be deleted? Or is that something special?

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Thanks for the quick fix!


> There is a workaround: reinstalling the app - but please note that this will delete all Locus stored data.


Oof, that's pretty unfortunate. I wouldn't want to redownload all maps.

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If the data in question is in the SRTM folder, it can be deleted. If I manually move the data there on my PC, I'll be asked if I want to overwrite it.

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Yes, the already downloaded elevation data can be deleted manually, but the process is quite technical and involves editing the Locus Map working directory. There is also a risk of accidental data loss. If you still want to proceed, the steps are:

  • Close Locus Map completely.
  • Connect your phone to a PC via USB.
  • Navigate to: Android/data/menion.android.locus/files/Locus/data/srtm/ and delete the following files: N66E016.hgt, N66E017.hgt, N67E016.hgt, N67E017.hgt.
  • Then go to: Android/data/menion.android.locus/files/Locus/cache/map/shader/ and delete all folders (all files) inside this directory.

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Why doesn't Locus overwrite the data when downloading again?

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> Navigate to: Android/data/menion.android.locus/files/Locus/data/srtm/ and delete the following files: N66E016.hgt, N66E017.hgt, N67E016.hgt, N67E017.hgt.

Thanks, that worked well.

> Why doesn't Locus overwrite the data when downloading again?


I'd imagine it would be difficult for Locus to show the "download elevation data" icon then, as it only knows when some region is missing not when it's outdated.

That said, storing elevation data in cache could be nice so that at least Android's simpler "clear cache" in app setting would work instead of the more technical approach described above.

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Locus does not overwrite elevation data when downloading because these files change very rarely. To avoid unnecessary downloads, Locus simply skips files that already exist on the device and downloads only the missing ones.

We do have a long‑term plan to introduce an update mechanism for elevation data - similar to updating of offline maps or navigation data for the offline LoRouter. However, because elevation data are not updated frequently, this feature has not had high priority so far.

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Definitely back up your data to the cloud beforehand.

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