Re: [GRASS-user] Type of data to be used in i.maxlik
Kim Besson wrote: >> >>> >>> The input can be double but will be read as integer (CELL) since the >>> function >>> G_open_cell_old() is used [1]. >>> >> > > This means what? That pixels with values >255 are all the same? I think the representable range of CELL is -2,147,483,647 to 2,147,483,647. Anything beyond the range of CELL will be transformed (by the system, not by GRASS) to fall within the range. > or pixels like 1,034 and 2,043 are rounded? Truncated, not rounded, e.g. 1.034 -> 1 1.9 -> 1 2.1 -> 2 -1.9 -> -1 Markus M ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Type of data to be used in i.maxlik
Hi Markus > > > >> The input can be double but will be read as integer (CELL) since the >> function >> G_open_cell_old() is used [1]. >> >> > ** > *This means what? That pixels with values >255 are all the same? or pixels like 1,034 and 2,043 are rounded?* ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Type of data to be used in i.maxlik
Hi Markus > The input can be double but will be read as integer (CELL) since the > function > G_open_cell_old() is used [1]. > > This means what? That pixels with values >255 are all the same? or pixels like 1,034 and 2,043 are rounded? Thanks Kim ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Type of data to be used in i.maxlik
On Fri, Oct 15, 2010 at 1:54 PM, Kim Besson wrote: > Greetings > Before I used i.maxlik I decided to give a look at the code. And I have one > question: > - the input data, I mean the data inside the group, must it be CELL > (integers that range 0-255) or can it be DOUBLE (double precision that range > whatever)? The input can be double but will be read as integer (CELL) since the function G_open_cell_old() is used [1]. > I believe that the training_area MUST be integers (for the obvious reason) Yes. Markus [1] http://grass.osgeo.org/programming6/opencell_8c.html#a1f48562fa8324da9929e8a089f124d2b ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Type of data to be used in i.maxlik
Greetings Before I used i.maxlik I decided to give a look at the code. And I have one question: - the input data, I mean the data inside the group, must it be CELL (integers that range 0-255) or can it be DOUBLE (double precision that range whatever)? I believe that the training_area MUST be integers (for the obvious reason) Thanks Kim ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
