[Qgis-user] Slope map creation

[Nicolas Cadieux]

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 <stefano.borello at geplan.it> 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
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> email:    stefano.borello at geplan.it 
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