As far as I see, the size of the output raster is equal to the input size with the gdaldem utility set. With the viewshed approach, the size of the output raster is calculated according to the provided parameters (ie. the observer location and maxdistance), however it is a good idea to allow the user customize the output format is some way.
Best regards, Tamas Eli Adam <[email protected]> ezt írta (időpont: 2019. szept. 30., H, 21:35): > On Mon, Sep 30, 2019 at 11:54 AM Even Rouault > <[email protected]> wrote: > > > > On lundi 30 septembre 2019 20:10:38 CEST Tamas Szekeres wrote: > > > Hi, > > > > > > I've implemented a viewshed algorithm a while ago, by utilizing a > modified > > > version of the algorithm published at > > > > https://www.asprs.org/wp-content/uploads/pers/2000journal/january/2000_jan_8 > > > 7-90.pdf > > > > > > With this approach, it was crucial to provide a fast real-time option > for > > > the viewshed calculation on relatively large raster DEMs by using only > a > > > small memory footprint. > > > > > > The implementation can be found here: > > > > > > https://github.com/szekerest/gdal/blob/viewshed/gdal/alg/viewshed.cpp > > > > https://github.com/szekerest/gdal/blob/viewshed/gdal/apps/gdal_viewshed.cpp > > > > > > Does it make sense to spend some more effort and incorporate this > approach > > > in GDAL officially? > > > > Sounds useful to me ! > > (old memories of having implement line-of-sight based intervisibility > > algorithm in a past life !) > > Gdaldem (although it has a different history) has an assortment of DEM > based utilities, https://gdal.org/programs/gdaldem.html I'm not sure > if it would make sense there or elsewhere. It would be a useful tool. > > Best regards, Eli > > > > > > > Even > > > > -- > > Spatialys - Geospatial professional services > > http://www.spatialys.com > > _______________________________________________ > > gdal-dev mailing list > > [email protected] > > https://lists.osgeo.org/mailman/listinfo/gdal-dev > _______________________________________________ > gdal-dev mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/gdal-dev
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