Hi Simone, > arcgrid reader should use the underlying values for the nodata, it > should be -9999 when it is an esri arcgrid, NaN when it is grass. > > Same should apply to aig, as I told you yesterday I would check the > underlying value first.
sure. I was just signaling this to the list, because some could have my same problems and not noticing it. The problem is that: - arcgrid not always have -9999.0, as well as grass (grass by default uses the *, which isn't even a number and might give the parser troubles) - if you access that all programmatically, you need to know from the reader what the novalue it used is. Even if you know what the novalue really is. I'll have to look into this, but not sure I have the time right now. I will at least give a quick look and decide what to do with it. Cheers, Andrea > > > Simone. > ------------------------------------------------------- > Ing. Simone Giannecchini > GeoSolutions S.A.S. > Founder - Software Engineer > Via Carignoni 51 > 55041 Camaiore (LU) > Italy > > phone: +39 0584983027 > fax: +39 0584983027 > mob: +39 333 8128928 > > > http://www.geo-solutions.it > http://geo-solutions.blogspot.com/ > http://www.linkedin.com/in/simonegiannecchini > http://twitter.com/simogeo > > ------------------------------------------------------- > > > > On Wed, Apr 28, 2010 at 9:54 AM, andrea antonello > <[email protected]> wrote: >> Ok, I will have to look into the code a bit better. >> >> AigReaders seem to give -Float.MAX_VALUE (probably depending on the >> content), while ArcgridReaders -9999.0. >> >> The gap seems to be in the step between imageio-ext and geotools. >> >> Will come back when I know something more. >> >> Cheers, >> Andrea >> >> >> On Tue, Apr 27, 2010 at 1:40 PM, andrea antonello >> <[email protected]> wrote: >>> Hi, I am trying to get the value that is used as novalue from a gricoverage. >>> >>> I was assuming something like: >>> GridSampleDimension[] sampleDimensions = inCoverage.getSampleDimensions(); >>> double[] noDataValues = sampleDimensions[0].getNoDataValues(); >>> >>> which returned me null. >>> >>> I then tried to get the categories to manually extract the novalue, >>> but these also ended up being null. >>> I am using the esri adf (AIGreader) that leverages imegio-ext. >>> >>> In order to spare time, can anyone tell me if the above is the right >>> way to get the value that is used as novalue? >>> In which case it is probably a bug and I would open a ticket in the >>> imageio-ext world. >>> >>> Thanks, >>> Andrea >>> >> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> Geotools-devel mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/geotools-devel >> > ------------------------------------------------------------------------------ _______________________________________________ Geotools-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-devel
