Whoops - somehow a double comma worked its way into the ."Call" lines in the first patch I sent. The attached patch is updated to address that issue.
Alex On Fri, May 30, 2014 at 10:48 AM, Alex Zvoleff <azvol...@conservation.org> wrote: > Dear list (and Robert Hijmans in particular), > > I am using the terrain function in the raster package to calculate > slope and aspect prior to performing topographic correction. The > landsat package supports applying a smoothing factor during the slope > calculation, to avoid over-correction of reflectance in high slope > areas with low illumination (as suggested by Riaño, Salas, and Aguado > 2003). However I have been using the terrain function in the raster > package to calculate slope and aspect since it can handle large > rasters and is coded in C. > > Attached is a patch to allow applying a smoothing factor when > calculating slope using the terrain function in raster. Is there a > chance of including the attached changes (based on r2994) in the next > release of raster? > > Thanks, > Alex > > Ref: Riaño D., Chuvieco E., Salas J., and Aguado I., 2003. Assessment > of different topographic corrections in Landsat-TM data for mapping > vegetation types. IEEE Transactions on Geoscience and Remote Sensing > 41: 1056-1061. > > -- > Alex Zvoleff > Postdoctoral Associate > Tropical Ecology Assessment and Monitoring (TEAM) Network > Conservation International > 2011 Crystal Dr. Suite 500, Arlington, Virginia 22202, USA > Tel: +1-703-341-2749, Fax: +1-703-979-0953, Skype: azvoleff > http://www.teamnetwork.org | http://www.conservation.org -- Alex Zvoleff Postdoctoral Associate Tropical Ecology Assessment and Monitoring (TEAM) Network Conservation International 2011 Crystal Dr. Suite 500, Arlington, Virginia 22202, USA Tel: +1-703-341-2749, Fax: +1-703-979-0953, Skype: azvoleff http://www.teamnetwork.org | http://www.conservation.org
smoothing_factor_v2.patch
Description: Binary data
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