thank you Nikos I meant that creating buffers from a line, which also querying DEM values.
DEM is in subquery position of buffer map regards On Thu, Apr 23, 2015 at 1:28 PM, Nikos Alexandris <[email protected]> wrote: > * Ahmet Temiz <[email protected]> [2015-04-23 12:16:49 +0300]: > > > hello, > > > > Which function can we use to generate a map that has conditional > buffering > > according to DEM from a line ? > > Hello Ahmet, > > I don't understand the "from a line" part of your question. Yet, I guess > you mean to keep a specific range of DEM values. > > You can directly use r.mapcalc for such tasks. > > 1) Remember to set the extent and the resolution of the active > computational region, it'll be also the one of the new map produced by > r.mapcalc > > 2) r.mapcalc 'NewMap = if( DEM > 100 && DEM < 200, DEM, null())' > > This example will write only DEM values between '100 < DEM < 200' in the > "NewMap" and will set to NULL all other pixels that don't satisfy the > above expression. For more, please look at r.mapcalc's manual. > > Of course, all this is valid and achievable via the GUI. > > Regards, Nikos > > -- Ahmet Temiz Jeoloji Müh. Afet ve Acil Durum Yönetimi Başkanlığı Bilgi İşlem Dairesi Başkanlığı-CBS Grubu ________________________ Ahmet Temiz Geological Eng. Information Systems - GIS Group Disaster and Emergency Management of Presidency
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