[postgis-users] Using ST_Slope in EPSG:4326

Pierre Racine Pierre.Racine at sbf.ulaval.ca
Fri May 8 07:09:37 PDT 2015

You have to project your raster wit ST_Transform() before calling ST_Slope().

You also have to ST_Union() your raster tiles before projecting it.

From: postgis-users-bounces at lists.osgeo.org [postgis-users-bounces at lists.osgeo.org] On Behalf Of Ahmet Temiz [ahmettemiz88 at gmail.com]
Sent: Friday, May 08, 2015 5:00 AM
To: PostGIS Users Discussion; PostGIS Users Discussion
Subject: [postgis-users] Using ST_Slope in EPSG:4326


( sorry for previous untitled message)

How can we get correct values from ST_Slope, if raster table  is in EPSG:4326 ?
we have to transform dem table to metric projection.

please let me know

kind regards

Ahmet Temiz
Jeoloji Müh.
Afet ve Acil Durum Yönetimi Başkanlığı
Bilgi İşlem  Dairesi Başkanlığı-CBS Grubu


Ahmet Temiz
Geological Eng.
Information Systems - GIS Group
Disaster and Emergency Management
of Presidency

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