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<p>Hello</p>
<p>This is a raster format? and how large are the tiles?</p>
<p>I spend a lot of time working with raster files often a few
thousand at a time. There doesn't seem to be a problem displaying
them in Qgis unless they are Progressive Jpeg format, which in
more recent years seem to have an issue with one of the third
party libraries Qgis uses to import with. <br>
</p>
<div class="moz-cite-prefix">On 29/09/22 00:32, Michael.Dodd via
Qgis-user wrote:<br>
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<p class="MsoNormal">I am trying to put together the 50m uk DEM
e.g. <a
href="https://www.data.gov.uk/dataset/835cf20a-8feb-4394-8b30-dcfe840ac13d/os-terrain-50-dtm"
moz-do-not-send="true" class="moz-txt-link-freetext">
https://www.data.gov.uk/dataset/835cf20a-8feb-4394-8b30-dcfe840ac13d/os-terrain-50-dtm</a>
but it often does not work. The data are supplied as
thousands of small tiles that takes ages to unpack and put
into a folder to get into qgis, however when you try to load
the tiles some work and others don’t and even the ones that do
work and display fine sometimes don’t merge to form large
tiles and sometimes will form virtual rasters but not merged
files. Basically it is a mess. I suspect others have done
this successfully so any suggestions?<o:p></o:p></p>
<p class="MsoNormal">It is particularly odd that some of the
tiles will merge and others won’t and that some won’t display
if you ask it to load hundreds at a time but if you just add
them in a few at a time then they will load and display (in
addition to the hundreds already loaded). This suggests
various bugs assuming the original data are not in a whole
variety of slightly different formats (should all be .asc)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<br>
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