Ciao Simone
Thank you very much for your answer.
Is there way to get a location of the min value?
Simone.Giannecchini wrote:
>
> Ciao Oleg,
> please red below...
>
> On Tue, Sep 9, 2008 at 10:40 AM, Oleg72 <[EMAIL PROTECTED]> wrote:
>
>>
>> Dear All,
>> I am trying to obtain a minimum value from an ASCII Grid. Unfortunately I
>> am
>> getting a nodata value instead.
>> I tried 2 ways:
>> - category.get(1).getRange().getMinimum(), and
>> - gridcoverage.getProperty("minimum") (based on Extrema operation)
>> both methods return -9999.0 (which is nodata value) but the real min
>> value
>> is about 700
>
>
>
> First observation. As noted before the category mechanism will not give
> you
> the min value.
> The best way to solve your problem would be as follow:
>
> 1> Get the NODATA value (check for the nodata category)
> 2a> if NODATA is NAN (as in grass ascii grids) extrema should give you the
> min
> 2b> if NODATA is not NAN ( as in esri ascii grids) histogram would be you
> friend as long as the NODATA is outside the valid range of your data. You
> can use histogram to get statistics only a specifi range of you dynamic.
> Of course I am open to suggestions for improving the usability of the
> arcgrid plugin.
>
> Hope that helps.
> Ciao,
> Simone.
>
>
>
>>
>>
>> The complete code I used:
>>
>> File file = new File("raster.asc");
>> ArcGridReader reader = new ArcGridReader(file);
>> gc = (GridCoverage2D) reader.read(null);
>> System.out.println("min VALUE: "
>> +gc.getSampleDimension(0).getCategories().get(1).getRange().getMinimum());
>>
>> op= new OperationJAI("Extrema");
>> ParameterValueGroup params = op.getParameters();
>> params.parameter("Source").setValue(gc);
>> gc=(GridCoverage2D)op.doOperation(params,null);
>> System.out.println("Grid Minimum
>> "+((double[])gc.getProperty("minimum"))[0]);
>>
>> Thank you very much in advance,
>> Oleg
>>
>> --
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>>
>>
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>
>
>
> --
> -------------------------------------------------------
> Eng. Simone Giannecchini
> GeoSolutions S.A.S.
> Owner - Software Engineer
> Via Carignoni 51
> 55041 Camaiore (LU)
> Italy
>
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>
>
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>
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