<div dir="ltr"><div>Can you share the output of gdalinfo of your original file?</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">karsten <<a href="mailto:karsten@terragis.net">karsten@terragis.net</a>> escreveu no dia sábado, 13/06/2020 à(s) 00:13:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div>
<div dir="ltr" align="left"><span><font size="2" face="Arial" color="#000080">Hi Pedro,</font></span></div>
<div dir="ltr" align="left"><span><font size="2" face="Arial" color="#000080"></font></span> </div>
<div dir="ltr" align="left"><span><font size="2" face="Arial" color="#000080">using your suggestion I came up with this command
:</font></span></div>
<div dir="ltr" align="left"><span><font size="2" face="Arial" color="#000080"></font></span> </div>
<div dir="ltr" align="left"><span><font size="2" face="Arial" color="#000080">gdal_translate -co COMPRESS=DEFLATE -co PREDICTOR=2 -co
ZLEVEL=9 -ot Byte -of GTiff -tr 1.0 -1.0 -a_nodata 0 input.tif
output.tif</font></span></div>
<div dir="ltr" align="left"><span><font size="2" face="Arial" color="#000080"></font></span> </div>
<div dir="ltr" align="left"><span><font size="2" face="Arial" color="#000080">and got the 5GB file cut result raster from before down to 43
MB !</font></span></div>
<div dir="ltr" align="left"><span></span> </div>
<div dir="ltr" align="left"><span></span><span></span><font face="Arial"><font color="#000080"><font size="2">T<span>h</span><span>a</span><span>nks</span></font></font></font></div>
<div dir="ltr" align="left"><span></span><span></span><font face="Arial"><font color="#000080"><font size="2">K<span>arsten</span></font></font></font><br></div>
<div dir="ltr" lang="en-us" align="left">
<hr>
<font size="2" face="Tahoma"><b>From:</b> Pedro Venâncio
[mailto:<a href="mailto:pedrongvenancio@gmail.com" target="_blank">pedrongvenancio@gmail.com</a>] <br><b>Sent:</b> Friday, June 12, 2020
13:19<br><b>To:</b> karsten<br><b>Cc:</b> QGIS User<br><b>Subject:</b> Re:
[Qgis-user] clip raster by mask layer (gdalwarp with -cutline option) enormously
bloats file size<br></font><br></div>
<div></div>
<div dir="ltr">
<div>Hi Karsten,</div>
<div><br></div>
<div>First you have to ensure that the output data type is also Byte:</div>
<div>-ot Byte</div>
<div><br></div>
<div>Second, your original raster must be some kind of compression. You can see
it with gdalinfo. So, you need to apply compression to the output file, for
instance with:
<p style="white-space:pre-wrap;margin:0px;text-indent:0px">-co
COMPRESS=DEFLATE -co PREDICTOR=2 -co ZLEVEL=9</p>
<p style="white-space:pre-wrap;margin:0px;text-indent:0px"><br></p>
<p style="white-space:pre-wrap;margin:0px;text-indent:0px">Best
regards,</p>
<p style="white-space:pre-wrap;margin:0px;text-indent:0px">Pedro
Venâncio</p>
<p style="white-space:pre-wrap;margin:0px;text-indent:0px"><br></p></div></div><br>
<div class="gmail_quote">
<div class="gmail_attr" dir="ltr">karsten <<a href="mailto:karsten@terragis.net" target="_blank">karsten@terragis.net</a>> escreveu no dia
sexta, 12/06/2020 à(s) 21:09:<br></div>
<blockquote class="gmail_quote" style="padding-left:1ex;margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)"><u></u>
<div>
<div><font size="2" face="Arial" color="#000080"><span>Hi All,</span></font></div>
<div> </div>
<div><font size="2" face="Arial" color="#000080"><span>I have a large *.tif raster
data set ( 92000 * 69000 cells of one meter, projection EPSG:25832 - ETRS89 /
UTM zone 32N )<br>It contains integer values 1 to 20 and has a file size
of about 100 MB in "Byte - Eight bit unsigned integer"
format. <br>Now the result is a rectangle and I wanted to cut it down to
the area of interest (via cutline gdal option) using a shape polygon file
(with one continuous polygon inside) to and set all values outside the area of
interest of that rectangle to NULL values (for example setting 0 as
NULL data values). I used the QGIS ( QGIS v 3.12 on windows) Menu RASTER
> Extraction > Clip Raster by mask Layer which is based on
gdalwarp.<br></span></font></div>
<div><font size="2" face="Arial" color="#000080"><span>That is when I am
running into the problem that the 'cut' file size increases enormously and I
ended up wit 50 times bigger file ( 5 GB size ! ) when I was actually
expecting a smaller file size than before.</span></font></div>
<div><font size="2" face="Arial" color="#000080"><span>I have not really
an idea why the file becomes so enormously bloated. The same is the
cass when I try gdalwarp directly on the command line or when using the QGIS
Raster calculator or any other method I tried so far.</span></font></div>
<div><font size="2" face="Arial" color="#000080"><span></span></font> </div>
<div><font size="2" face="Arial" color="#000080"><span>How can I manage to get a
smaller file size ( aka the 100 MB file size I started of with ) and which
tools or formats are recommended to achieve this ?</span></font></div>
<div><font size="2" face="Arial" color="#000080"><span>Cheers</span></font></div>
<div><font size="2" face="Arial" color="#000080"><span>Karsten</span></font></div>
<div><font size="2" face="Arial" color="#000080"><span></span></font> </div>
<div><span style="font-size:11pt;font-family:"Verdana","sans-serif"">Karsten
Vennemann<br></span><span style="font-size:9pt;font-family:"Verdana","sans-serif""><span style="color:rgb(0,50,100)"><a title="http://www.terragis.net/
blocked::http://www.terragis.net/" href="http://www.terragis.net" target="_blank"><font title="http://www.terragis.net/" color="#0000ff">www.terragis.net</font></a></span></span><u></u><u></u><u></u></div>
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