Hello, developers.
I want to create a very simple Coverage based on GDAL(ReadOnly without cashing,
etc).
I have no problems with GDAL in JAVA (with swig). Examples in
gdal/swig/java/app are working OK.
I see at GeoTools/modules/plugin image, arcgrid, wms,arcsde and others, I also
read OGC spec about Coverage.
I have not found the steps to create a custom Coverage(no documentation).
Could anybody help me to start?
I think my steps must be:
1. Inherit class GdalImageFormatFactory implements GridFormatFactorySpi.
2. Inherit class GdalImageFormat extends AbstractGridFormat implements Format.
3. Inherit class GdalImageReader extends AbstractGridCoverage2DReader
implements GridCoverageReader.
I have problems with 3 step. I can't choose what method I must to implement.
The interactions with GDal must be:
GT> Coverage, give me an image for World BBOX(minx,miny,maxx,maxx) with
resolution in pixels SIZE(width,height). This like WMS GetMap request.
Coverage(Gdal)> Ok. I create GridCoverage from BufferedImage for you.
Thus, I can create method in GdalImageReader:
BufferedImage getImage(double minx,double miny,double maxx,double maxy,int
width,int height)
{
// insensive GDAL usage.
}
But I don't understand how to use it from GridCoverageReader. Please, help me.
I have found public GridCoverage read(GeneralParameterValue[] params)
throws IllegalArgumentException, IOException ;
But how to get BBOX and SIZE values for this request? GeneralParameterValue[]
params are no the reason(I think).
Is it possible to inherit AbstractGridCoverage2DReader to
AbstractSimpleGridCoverage2DReader which use my method getImage(..) ? I think
it is easy and usable for start point.
Thank you.
P.S.
If I can implement GridCoverageReader in my way(see getImage), I also plan to
create simple ArcGIS .MXD Coverage plugin.
Thus you can create ArcGis MXD Document(add layers and its visualization) and
use it in GeoServer.
Have a great day.
Andrew.
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