[mkgmap-dev] Deletion of unneeded hgt files

Sun Apr 4 10:26:24 BST 2021

Hi Carlos,

reg. N64W180.hgt:
I've not recorded where I got my files from, but yes, it's a 3'' file and I got most of them from viewfinderpanoramas.
I'll triple check if OSM contains any data for this area or did you do this already?

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Carlos Dávila <carlos at alternativaslibres.org>
Gesendet: Sonntag, 4. April 2021 11:21
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] Deletion of unneeded hgt files

El 3/4/21 a las 15:06, Gerd Petermann escribió:
> Hi Carlos,
>
> please double check:
> I don't have files for N60E157, N72E057 and N77E083
Correct
> I have a N64W180.hgt with a few non-zero values.
According to Google satellite imagery, this tile is all sea. Where did
you get it from? I can only find 3 arcsec tile from viewfinderpanoramas
for this tile, no 1 arcsec in VFP, SRTM or ALOS.
>
> Results are in new patch.
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Carlos Dávila <carlos at alternativaslibres.org>
> Gesendet: Samstag, 3. April 2021 13:27
> An: mkgmap-dev at lists.mkgmap.org.uk
> Betreff: Re: [mkgmap-dev] Deletion of unneeded hgt files
>
> Regarding tiles covering Caspian Sea (N37E051 to N44E049), I thought
> it's height would be 0, but if the real height is -29m then they should
> not be removed from known-hgt.txt. But they are no longer available from
> SRTM or ALOS.
>
> The other tiles removed in my patch are in open sea areas, so their
> height should be 0 and can be IMHO safely removed.
>
> El 3/4/21 a las 10:04, Gerd Petermann escribió:
>> Hi Carlos,
>>
>> not sure what to do with this. Seems your patch removes the files which are listed here:
>> https://www.opentopodata.org/notes/invalid-srtm-zips/
>>
>> My SRTM directory contains the listed files and they show a constant height of -29m as stated in the linked page.
>>
>> My understanding is that you don't have those files, but you should have. A non-existing file is treated like a file with height 0.
>>
>> Gerd
>>
>> ________________________________________
>> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Carlos Dávila <carlos at alternativaslibres.org>
>> Gesendet: Samstag, 3. April 2021 09:45
>> An: Development list for mkgmap
>> Betreff: [mkgmap-dev] Deletion of unneeded hgt files
>>
>> Attached patch deletes some hgt files which correspond to ocean areas
>> from known-hgt.txt file. They just lead to confusing warnings when
>> running mkgmap to generate a map with DEM.
>>
>> _______________________________________________
>> mkgmap-dev mailing list
>> mkgmap-dev at lists.mkgmap.org.uk
>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
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