Re: [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#

LatitudeZ-factor
 0  0.0898
10  0.0912
20  0.0956
30  0.1036
40  0.1171
50  0.1395
60  0.1792
70  0.2619
80  0.5156

Nicolas Cadieux
Ça va bien aller!

> Le 27 avr. 2020 à 04:47, stefano borello  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:stefano.bore...@geplan.it 
> 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.
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Re: [Qgis-user] Slope map creation

[Raymond Nijssen]

Hi Stefano,

Could it be your data is "unprojected"? (your map units are in degrees?)

Raymond


On 27-04-2020 10:47, stefano borello wrote:

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: stefano.bore...@geplan.it 
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.*



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[Qgis-user] Slope map creation

[stefano borello]

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:stefano.bore...@geplan.it
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.*
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