Ok, thank you again Chaitanya, But what is the function of this two element?
2012/3/23 Chaitanya kumar CH <chaitanya...@gmail.com> > Saâd, > > A VRT raster band can be derived from more than one source. > > Offset and Scale elements apply to the whole VRT raster band. > The ScaleOffset and ScaleRatio perform the same task but it is done only > on that particular ComplexSource. > > On Fri, Mar 23, 2012 at 3:43 PM, Saâd HESSANE <saad.hess...@gmail.com>wrote: > >> Hy all, >> >> The vrt format allow defining the scale and offset element. But the >> documentation is not clear about that : >> >> - *Offset*: This optional element contains the offset that should be >> applied when computing "real" pixel values from scaled pixel values on a >> raster band. The default is 0.0. >> - *Scale*: This optional element contains the scale that should be >> applied when computing "real" pixel values from scaled pixel values on a >> raster band. The default is 1.0. >> >> What that it's mean ? If the value of offset is 1 what that it's change? >> >> And this two elements are use in the *VRTRasterBand* element. What about >> *ScaleOffset* and *ScaleRatio* in the *ComplexSource* element? >> >> Thank you. >> >> _______________________________________________ >> gdal-dev mailing list >> gdal-dev@lists.osgeo.org >> http://lists.osgeo.org/mailman/listinfo/gdal-dev >> > > > > -- > Best regards, > Chaitanya kumar CH. > > +91-9494447584 > 17.2416N 80.1426E >
_______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
