<div dir="ltr"><p style="margin:0px;padding:0px;border:0px;font-size:13px;font-family:arial,helvetica,'helvetica neue',verdana,sans-serif;vertical-align:baseline;color:rgb(61,61,61);line-height:19.5px">Hello,</p><p style="margin:0px;padding:0px;border:0px;font-size:13px;font-family:arial,helvetica,'helvetica neue',verdana,sans-serif;vertical-align:baseline;color:rgb(61,61,61);line-height:19.5px">
I use arcmap desktop 10.2.2. In the workflow i use atm i make a geotiff using the export map option in arcmap. </p><p style="margin:0px;padding:0px;border:0px;font-size:13px;font-family:arial,helvetica,'helvetica neue',verdana,sans-serif;vertical-align:baseline;color:rgb(61,61,61);line-height:19.5px">
I need 4000dpi and i use geotiff tags and compression (LZW).</p><p style="margin:0px;padding:0px;border:0px;font-size:13px;font-family:arial,helvetica,'helvetica neue',verdana,sans-serif;vertical-align:baseline;color:rgb(61,61,61);line-height:19.5px">
The resolutions of my geotiff is. </p><p style="margin:0px;padding:0px;border:0px;font-size:13px;font-family:arial,helvetica,'helvetica neue',verdana,sans-serif;vertical-align:baseline;color:rgb(61,61,61);line-height:19.5px">
See png</p><p style="margin:0px;padding:0px;border:0px;font-size:13px;font-family:arial,helvetica,'helvetica neue',verdana,sans-serif;vertical-align:baseline;color:rgb(61,61,61);line-height:19.5px"><a href="https://geonet.esri.com/servlet/JiveServlet/showImage/2-391241-2616/rasterinfo.png" style="margin:0px;padding:0px;border:0px;font-weight:inherit;font-style:inherit;font-family:inherit;vertical-align:baseline;color:rgb(40,116,51);text-decoration:none"><img alt="rasterinfo.png" class="" height="463" src="https://geonet.esri.com/servlet/JiveServlet/downloadImage/2-391241-2616/rasterinfo.png" width="631" style="margin: 10px 10px 10px 0px; padding: 0px; border: 0px; font-weight: inherit; font-style: inherit; font-family: inherit; vertical-align: baseline; width: 620px; height: 455px;"></a></p>
<p style="margin:0px;padding:0px;border:0px;font-size:13px;font-family:arial,helvetica,'helvetica neue',verdana,sans-serif;vertical-align:baseline;color:rgb(61,61,61);line-height:19.5px">I use the geotiff as raster for a 3D simulation. The software i use for this needs a specific resolution. </p>
<p style="margin:0px;padding:0px;border:0px;font-size:13px;font-family:arial,helvetica,'helvetica neue',verdana,sans-serif;vertical-align:baseline;color:rgb(61,61,61);line-height:19.5px">They need to by in the power of 2.  So the rows and columns need to by 4096, 8192, 16384, 32768, 65536, 131072 etc.</p>
<p style="margin:0px;padding:0px;border:0px;font-size:13px;font-family:arial,helvetica,'helvetica neue',verdana,sans-serif;vertical-align:baseline;color:rgb(61,61,61);line-height:19.5px">I use QGIS to adjust the resolution. see png</p>
<p style="margin:0px;padding:0px;border:0px;font-size:13px;font-family:arial,helvetica,'helvetica neue',verdana,sans-serif;vertical-align:baseline;color:rgb(61,61,61);line-height:19.5px"><a href="https://geonet.esri.com/servlet/JiveServlet/showImage/2-391241-2617/rasterqgis.png" style="margin:0px;padding:0px;border:0px;font-weight:inherit;font-style:inherit;font-family:inherit;vertical-align:baseline;color:rgb(40,116,51);text-decoration:none"><img alt="rasterqgis.png" class="" height="579" src="https://geonet.esri.com/servlet/JiveServlet/downloadImage/2-391241-2617/rasterqgis.png" width="586" style="margin: 10px 10px 10px 0px; padding: 0px; border: 0px; font-weight: inherit; font-style: inherit; font-family: inherit; vertical-align: baseline; height: auto;"></a></p>
<p style="margin:0px;padding:0px;border:0px;font-size:13px;font-family:arial,helvetica,'helvetica neue',verdana,sans-serif;vertical-align:baseline;color:rgb(61,61,61);line-height:19.5px;min-height:8pt"> </p><p style="margin:0cm 0cm 0.0001pt;line-height:14.65pt;vertical-align:baseline">
<span lang="EN-GB" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(61,61,61)">What i found out is that QGIS is not
good with compression. My arcmap export fire is 120k. The file QGIS makes is
6292k without compression and 4194 with compression.</span></p><p style="margin:0cm 0cm 0.0001pt;line-height:14.65pt;vertical-align:baseline"><span lang="EN-GB" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(61,61,61)"> </span><span style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(61,61,61)"></span><span lang="EN-GB" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(61,61,61)"></span></p>
<p style="margin:0cm 0cm 0.0001pt;line-height:14.65pt;vertical-align:baseline"><span lang="EN-GB" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(61,61,61)">Also the low and high compression file
size is the same and JPEG is not working.</span></p><p style="margin:0cm 0cm 0.0001pt;line-height:14.65pt;vertical-align:baseline"><span lang="EN-GB" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(61,61,61)"> </span></p>
<p style="margin:0cm 0cm 0.0001pt;line-height:14.65pt;vertical-align:baseline"><span lang="EN-GB" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(61,61,61)">Why is the file size so big and what can
i do about it.</span></p><p style="margin:0cm 0cm 0.0001pt;line-height:14.65pt;vertical-align:baseline"><span lang="EN-GB" style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(61,61,61)"> </span></p><p style="margin:0px;padding:0px;border:0px;font-size:13px;font-family:arial,helvetica,'helvetica neue',verdana,sans-serif;vertical-align:baseline;color:rgb(61,61,61);line-height:19.5px">












</p><p style="margin:0cm 0cm 0.0001pt;line-height:14.65pt;vertical-align:baseline"><span style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(61,61,61)">thank you and greetings Peter</span></p></div>