<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi,<div><br><div>That data is in long/lat for x and y and in meters for z. You need to find the correct z factor or save the data in a projected crs where x,y,z are all in meters.</div><div><br></div><div>You can ball parc this value or if this is for important stuff, calculate it for each centre of each tile. I have a python script for this that I could find if this is mission critical data. </div><div><br></div><div><a href="https://pro.arcgis.com/fr/pro-app/tool-reference/3d-analyst/applying-a-z-factor.htm#">https://pro.arcgis.com/fr/pro-app/tool-reference/3d-analyst/applying-a-z-factor.htm#</a></div><div><br></div><div><pre purpose="pre" id="GUID-A0DF476A-AA08-45B8-96EF-7556D16D7785" style="font-family: Consolas, "Andale Mono", "Lucida Console", Monaco, monospace; word-wrap: break-word; max-width: 100%; margin-bottom: 1.55rem; caret-color: rgb(76, 76, 76); color: rgb(76, 76, 76); font-size: 17px; -webkit-text-size-adjust: 100%;">Latitude Z-factor
0 0.00000898
10 0.00000912
20 0.00000956
30 0.00001036
40 0.00001171
50 0.00001395
60 0.00001792
70 0.00002619
80 0.00005156</pre><div><br><div dir="ltr">Nicolas Cadieux<div>Ça va bien aller!</div></div><div dir="ltr"><br><blockquote type="cite">Le 27 avr. 2020 à 04:47, stefano borello <stefano.borello@geplan.it> a écrit :<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><div dir="ltr">Dear QGIS Support,<div><br>I am Stefano Borello from Italy and I have a problem regarding the creation of a Slope map.</div><div><br>I downloaded the DEM from Earthexplorer, in the specific a SRTM 30 m resolution. </div><div><br>When I applied the Raster analysis the final result is a bit strange and the final results are wrong.</div><div><br><div>I can deliver the DEM file if you want.</div><div><br></div><div>Please let me know</div><div><br></div><div>Kind Regards</div><div><br></div><div>Stefano Borello <br><div><div dir="ltr" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:12pt"><div><b style="font-size:12.8px;font-family:Arial,Helvetica,sans-serif;color:rgb(34,34,34)"><br></b></div><div><b style="font-size:12.8px;font-family:Arial,Helvetica,sans-serif;color:rgb(34,34,34)">"simply geosciences"</b><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr" style="font-size:12.8px"><br>***************************<br><b>Stefano Borello</b></div><div dir="ltr"><span style="font-size:12.8px">Senior Geologist</span></div><div dir="ltr"><span style="font-size:12.8px"><br></span><span style="font-size:12.8px">GEPlan Consulting - Petroleum GeoSciences</span><br><span style="font-size:12.8px">Address: </span><a href="https://maps.google.com/?q=via+L.+Ariosto,+58+-+%C2%A044121+Ferrara+-+ITALY&entry=gmail&source=g" style="font-size:12.8px;color:rgb(17,85,204)" target="_blank">via L. Ariosto, 58 - 44121 Ferrara - ITALY</a><br><span style="font-size:12.8px">Phone Office: +39 0532 207770 </span></div><div dir="ltr"><span style="font-size:12.8px">email: <a href="mailto:stefano.borello@geplan.it" target="_blank">stefano.borello@geplan.it</a> </span><br><div style="font-size:12.8px"></div><div style="font-size:12.8px">website: <a href="https://smex-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=http%3a%2f%2fwww.geplan.it&umid=3b649fbe-203d-46cc-bec1-817e04a9a107&auth=5b2d0c582c456454f2d324f601dc50e7881871c2-8904e5cf54bb1a9549421939fca68e8a1c4b8853" style="color:rgb(17,85,204)" target="_blank">www.geplan.it</a></div><div style="font-size:12.8px"><i style="color:rgb(0,0,0);font-size:12.8px">Help us in supporting the project "P<span style="font-family:Arial,sans-serif">sycho-oncology in childhood: </span><span style="font-family:Arial,sans-serif">direct intervention to the needs of children and their families</span>" by Associazione Giulia (<a href="https://smex-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=http%3a%2f%2fwww.associazionegiulia.com&umid=3b649fbe-203d-46cc-bec1-817e04a9a107&auth=5b2d0c582c456454f2d324f601dc50e7881871c2-b22db78b3c00e091c27d649271c1e376ec491b48" style="color:rgb(17,85,204)" target="_blank">www.associazionegiulia.com</a>)</i><br></div><div><p style="font-size:12.8px"><b>This email and any attachment contain information which is private and confidential and is intended for the internal use of addressee only. Any use by third parties <span style="font-size:12.8px">is strictly prohibited, it </span><span style="font-size:12.8px">must be authorized by GEPlan and it may be punishable as a crime under applicable local law. </span><span style="font-size:12.8px">If you have received this email by mistake, please destroy it and notify it to the sender.</span></b></p></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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