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List: grass-user
Subject: Re: [GRASS-user] TPI (terrain position index) in GRASS GIS
From: Bernardo Santos <bernardo_brandaum () yahoo ! com ! br>
Date: 2020-10-09 11:13:32
Message-ID: 432036992.1019305.1602242012136 () mail ! yahoo ! com
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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@nina.no> escreveu:
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{}#yiv0189279323 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@lists.osgeo.org>On Behalf Of Bernardo Santos
Sent: torsdag 8. oktober 2020 12:35
To: GRASS User List <grass-user@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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style="font-family:Helvetica Neue, Helvetica, Arial, \
sans-serif;font-size:16px;"><div></div> <div dir="ltr" data-setdir="false">Hi \
Stefan,</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" \
data-setdir="false">Sure, that makes all sense! I am not used to DEM-realted indices, \
but I could have just thought a little...</div><div dir="ltr" \
data-setdir="false">Thanks a lot!</div><div dir="ltr" \
data-setdir="false"><br></div><div dir="ltr" \
data-setdir="false">B<br></div><div><br></div>
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Em quinta-feira, 8 de outubro de 2020 12:50:35 GMT+2, Stefan \
Blumentrath <stefan.blumentrath@nina.no> escreveu: </div>
<div><br></div>
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<p class="yiv0189279323MsoNormal"><span style="" lang="EN-US">Hi Brenado,</span></p>
<p class="yiv0189279323MsoNormal"><span style="" lang="EN-US"> </span></p>
<p class="yiv0189279323MsoNormal"><span style="" lang="EN-US">TPI is rather simple \
and can be computed with r.neighbors + r.mapcalc:</span></p> <p \
class="yiv0189279323MsoNormal"><span style="" lang="EN-US"> </span></p> <p \
class="yiv0189279323MsoNormal"><span style="" lang="EN-US">r.neighbors -c input=dem \
output=dem_avg_9 size=9</span></p> <p class="yiv0189279323MsoNormal"><span \
style="">r.mapcalc expression="TPI_9=dem-dem_avg_9"</span></p> <p \
class="yiv0189279323MsoNormal"><span style="">g.remove -f type=raster \
name=dem_avg_9</span></p> <p class="yiv0189279323MsoNormal"><span style=""> \
</span></p> <p class="yiv0189279323MsoNormal"><span style="">Cheers</span></p> \
<p class="yiv0189279323MsoNormal"><span style="">Stefan</span></p>
<p class="yiv0189279323MsoNormal"><span style=""> </span></p>
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<p class="yiv0189279323MsoNormal"><b><span lang="EN-US">From:</span></b><span \
lang="EN-US"> grass-user <grass-user-bounces@lists.osgeo.org> <b>On Behalf Of \
</b>Bernardo Santos<br clear="none"> <b>Sent:</b> torsdag 8. oktober 2020 12:35<br \
clear="none"> <b>To:</b> GRASS User List <grass-user@lists.osgeo.org><br \
clear="none"> <b>Subject:</b> [GRASS-user] TPI (terrain position index) in GRASS \
GIS</span></p> </div>
</div>
<p class="yiv0189279323MsoNormal"> </p>
<div>
<div>
<p class="yiv0189279323MsoNormal"><span \
style="font-size:12.0pt;font-family:sans-serif;">Hi everyone,</span></p> </div>
<div>
<p class="yiv0189279323MsoNormal"><span \
style="font-size:12.0pt;font-family:sans-serif;"> </span></p> </div>
<div>
<p class="yiv0189279323MsoNormal"><span \
style="font-size:12.0pt;font-family:sans-serif;">Do any of you know if we can \
calculate TPI (terrain position index) in GRASS GIS?</span></p> </div>
<div>
<p class="yiv0189279323MsoNormal"><span \
style="font-size:12.0pt;font-family:sans-serif;">Or should we go for other tools such \
as SAGA GIS?</span></p> </div>
<div>
<p class="yiv0189279323MsoNormal"><span \
style="font-size:12.0pt;font-family:sans-serif;"> </span></p> </div>
<div>
<p class="yiv0189279323MsoNormal"><span \
style="font-size:12.0pt;font-family:sans-serif;">Best wishes,</span></p> </div>
<div>
<p class="yiv0189279323MsoNormal"><span \
style="font-size:12.0pt;font-family:sans-serif;">Bernardo Niebuhr</span></p> </div>
</div></div>
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