Hi,
another, may be simpler option is SAGA GIS, its analytical hillshading
tool includes a ray tracing option:
http://www.saga-gis.org/saga_tool_doc/4.1.0/ta_lighting_0.html
Volker
On 05/16/2017 10:22 AM, Newcomb, Doug wrote:
Kenlo,
Suggest you look at GRASS GIS r.sun ,
https://grass.osgeo.org/grass72/manuals/r.sun.html.
Doug
On Tue, May 16, 2017 at 3:16 AM, NASAHARA Kenlo <[email protected]
<mailto:[email protected]>> wrote:
Dear GDAL people:
Using DSM, I want a "shadow map" not only by the slope
itself but also by the other slopes. I mean, if a tall and
steep peak exists, and if it is illuminated by the sun from
near the horizon, the shadow of the peak falls on a wide
area of the foot of the mountain. Such shadow is normally
not estimated by a simple "hillsahde" algorithm, which
includes the "gdaldem" command. I want to map such
shadows as well as the normal "hillshade" shadows.
If you know a library or command to help it, please let
me know!!
--
Kenlo Nishida Nasahara
Faculty of Life and Environmental Sciences
University of Tsukuba, Japan 305-8572
[email protected] <mailto:[email protected]>
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--
Doug Newcomb
USFWS
551F Pylon Dr
Raleigh, NC
919-856-4520 ext. 14 [email protected] <mailto:[email protected]>
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