[mkgmap-dev] Deletion of unneeded hgt files

Sun Apr 4 11:13:47 BST 2021

No OSM data, only maritime admin boundary.

El 4/4/21 a las 11:26, Gerd Petermann escribió:
> 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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