Hi, 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.
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. https://pro.arcgis.com/fr/pro-app/tool-reference/3d-analyst/applying-a-z-factor.htm# 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 Nicolas Cadieux Ça va bien aller! > Le 27 avr. 2020 à 04:47, stefano borello <[email protected]> a écrit : > > > Dear QGIS Support, > > I am Stefano Borello from Italy and I have a problem regarding the creation > of a Slope map. > > I downloaded the DEM from Earthexplorer, in the specific a SRTM 30 m > resolution. > > When I applied the Raster analysis the final result is a bit strange and the > final results are wrong. > > I can deliver the DEM file if you want. > > Please let me know > > Kind Regards > > Stefano Borello > > "simply geosciences" > > *************************** > Stefano Borello > Senior Geologist > > GEPlan Consulting - Petroleum GeoSciences > Address: via L. Ariosto, 58 - 44121 Ferrara - ITALY > Phone Office: +39 0532 207770 > email: [email protected] > website: www.geplan.it > Help us in supporting the project "Psycho-oncology in childhood: direct > intervention to the needs of children and their families" by Associazione > Giulia (www.associazionegiulia.com) > 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 is strictly prohibited, it must be authorized by GEPlan and > it may be punishable as a crime under applicable local law. If you have > received this email by mistake, please destroy it and notify it to the sender. > > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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