[gdal-dev] mapping of shadows casted by other slopes

[Volker Wichmann]

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 <24dakenlo at gmail.com 
> <mailto:24dakenlo at gmail.com>> 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
>     24dakenlo at gmail.com <mailto:24dakenlo at gmail.com>
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> 
> 
> 
> -- 
> Doug Newcomb
> USFWS
> 551F Pylon Dr
> Raleigh, NC
> 919-856-4520 ext. 14 doug_newcomb at fws.gov <mailto:doug_newcomb at fws.gov>
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