Thanks! Can you help me with another thing? My images have 15m pixels, after processing in r.mapcalc and exporting they have 62m pixels. How can I solve this?
Thanks again Regards, Luiz Claudio > Em 20 de fev de 2017, à(s) 18:42, Helmut Kudrnovsky <hel...@web.de> escreveu: > >> 1 - Why wasn’t r.mapcalculator ported to grass7? It is great to use it from > within QGIS. > > can't answer this one > >> My r.mapcalc outputs int32 rasters (I want float32). Is there a way to > choose the output type? > > from the manual [1] > > ------------------------ > [...] > Functions > The functions currently supported are listed in the table below. The type of > the result is indicated in the last column. F means that the functions > always results in a floating point value, I means that the function gives an > integer result, and * indicates that the result is float if any of the > arguments to the function are floating point values and integer if all > arguments are integer. > > [...] > Floating point values in the expression > Floating point values in the expression are handled in a special way. With > arithmetic and logical operators, if either operand is float, the other is > converted to float and the result of the operation is float. This means, in > particular that division of integers results in a (truncated) integer, while > division of floats results in an accurate floating point value. With > functions of type * (see table above), the result is float if any argument > is float, integer otherwise. > > Note: If you calculate with integer numbers, the resulting map will be > integer. If you want to get a float result, add the decimal point to integer > number(s). > > If you want floating point division, at least one of the arguments has to be > a floating point value. Multiplying one of them by 1.0 will produce a > floating-point result, as will using float(): > > r.mapcalc "ndvi = float(lsat.4 - lsat.3) / (lsat.4 + lsat.3)" > [...] > ------------------------ > > HTH > > [1] https://grass.osgeo.org/grass73/manuals/r.mapcalc.html > > > > ----- > best regards > Helmut > -- > View this message in context: > http://osgeo-org.1560.x6.nabble.com/r-mapcalculator-and-r-mapcalc-tp5308738p5308742.html > Sent from the Grass - Users mailing list archive at Nabble.com. > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/grass-user
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