[GRASS-user] TPI (terrain position index) in GRASS GIS

[Bernardo Santos]

 Hi Stefan,
Sure, that makes all sense! I am not used to DEM-realted indices, but I could have just thought a little...Thanks a lot!
B

    Em quinta-feira, 8 de outubro de 2020 12:50:35 GMT+2, Stefan Blumentrath <stefan.blumentrath at nina.no> escreveu:  
 
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Hi Brenado,
 
  
 
TPI is rather simple and can be computed with r.neighbors + r.mapcalc:
 
  
 
r.neighbors -c input=dem output=dem_avg_9 size=9
 
r.mapcalc expression=”TPI_9=dem-dem_avg_9”
 
g.remove -f type=raster name=dem_avg_9
 
  
 
Cheers
 
Stefan
 
  
 
From: grass-user <grass-user-bounces at lists.osgeo.org>On Behalf Of Bernardo Santos
Sent: torsdag 8. oktober 2020 12:35
To: GRASS User List <grass-user at lists.osgeo.org>
Subject: [GRASS-user] TPI (terrain position index) in GRASS GIS
 
  
 
Hi everyone,
 
  
 
Do any of you know if we can calculate TPI (terrain position index) in GRASS GIS?
 
Or should we go for other tools such as SAGA GIS?
 
  
 
Best wishes,
 
Bernardo Niebuhr
   
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