[Qgis-user] Problem merging 30-m SRTM tiles in QGIS 3.24.3 for MacOS 10.14.6

[Richard McDonnell]

Hi Walter,
As an alternative to Wouter’s suggestion, I would recommend VRT’s (Raster ==> Miscellaneous ==> Build Virtual Raster) Not alone does it merge/mosaic but it also results in a small file size. It is also very easy to generate convert that VRT to any other format output, using gdal_translate (Raster ==> Conversion ==> Translate)
I hope this helps,
Kind Regards,

Richard


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Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

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MSc GIS, FME Certified Professional

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From: Qgis-user <qgis-user-bounces at lists.osgeo.org> On Behalf Of Wouter Impens via Qgis-user
Sent: 20 May 2022 11:04
To: qgis-user <qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] Problem merging 30-m SRTM tiles in QGIS 3.24.3 for MacOS 10.14.6

Hi Walter,

I'm having good results using the 'r.patch' tool from GRASS for merging rasters.

Hope this helps

Greetings
Wouter

Op do 19 mei 2022 om 23:31 schreef Walter Alvarez via Qgis-user <qgis-user at lists.osgeo.org<mailto:qgis-user at lists.osgeo.org>>:

I’m trying to merge either two or twelve 30-m SRTM tiles using QGIS 3.14.3.  In either case (2 or 12) I am stopped by the following problem:

Using Raster > Miscellaneous > Merge…

I get the “Merge" window.   I try to use Input layers > Elements selected > “…"

That takes me to the "Multiple Selection" window, showing the 2 or 12 files I want to merge (filenames:   nXXeXXX_1arc_v3 [EPSG:4326]).

After selecting all the files, when I click “OK”   the "Multiple Selection Window” and the “Merge” window both disappear, and I cannot figure out what to do next, or do differently.

I can’t figure out how to get past this problem and merge my tiles.

Thanks for any help you can offer!

Walter

__________


Walter Alvarez
Professor of the Graduate School
Department of Earth and Planetary Science
University of California Berkeley


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