DEM and "holes"

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DEM and "holes"

Frank Stinner-2
Unfortunately we have no chance for a good shading if the HGT's have so much "holes" (no data values) like nepal. I have made this picture with QGIS.
The blue areas are "no data". I don't know, what makes mapsource with this.

Frank


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Re: DEM and "holes"

Frank Stinner-2
A short test with the geo-tiffs from https://earthexplorer.usgs.gov/ (see mail from franco_bez) for nepal show fewer holes. And we have 1" distance!
But a login is necessary.

I have a little c#-prog based on the gdal-lib for translating between hgt and 16-bit geotiff.


Frank

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Re: DEM and "holes"

Frank Stinner-2
Sorry, here is the jpeg.

Frank


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Re: DEM and "holes"

Frank Stinner-2
In reply to this post by Frank Stinner-2
Sorry, here is really the jpeg.

Frank


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Re: DEM and "holes"

Thomas Morgenstern
In reply to this post by Frank Stinner-2
Hi Frank, can you give us a compiled version for windows for the
geotiff ----> hgt converter ?
thomas

--------------------------------------------------
Von: "Frank Stinner" <[hidden email]>
Datum: Montag, 1. Januar 2018 18:28
An: <[hidden email]>
Betreff: Re: [mkgmap-dev] DEM and "holes"

> A short test with the geo-tiffs from https://earthexplorer.usgs.gov/ (see
> mail from franco_bez) for nepal show fewer holes. And we have 1" distance!
> But a login is necessary.
>
> I have a little c#-prog based on the gdal-lib for translating between hgt
> and 16-bit geotiff.
>
>
> Frank
>
> ---
> Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft.
> https://www.avast.com/antivirus
>
>
> _______________________________________________
> mkgmap-dev mailing list
> [hidden email]
> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev 

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Re: DEM and "holes"

franco_bez
See this tutorial for converting tif to hgt
http://www.oruxmaps.com/foro/viewtopic.php?t=3612#
<http://www.oruxmaps.com/foro/viewtopic.php?t=3612#>  

I just created a linux shell script to replace the "tif2hgt.bat"
tif2hgt.sh <http://gis.19327.n8.nabble.com/file/t339543/tif2hgt.sh>  

PS: Just note the "holes" are usually called "voids"



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Re: DEM and "holes"

Frank Stinner
In reply to this post by Frank Stinner-2
This is my tool:

https://github.com/FSofTlpz/gdal4hgt

https://github.com/FSofTlpz/gdal4hgt/blob/master/bin/Release/Gdal4Hgt.exe

It also need gdal-tools like tif2hgt.


Frank
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