[postgis-users] Using ST_Slope in EPSG:4326

[Pierre Racine]

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.

Pierre
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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

hello,

( sorry for previous untitled message)

How can we get correct values from ST_Slope, if raster table  is in EPSG:4326 ?
or
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


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