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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Bill, thanks for that. The lightbulb in my head finally lit up. I made a small adaption to the GIFAdaptor to take care of the positioning in the geographic space. At that point the combining of the FlatFields worked flawless. I put the result and the code here: http://www.jgrass.org/cgi-bin/moin.cgi/HowItIsGoingWithVisad There will be need for optimization of the code, but it works. I found that image is read flipped against the geographic position, so I did a workaround on the colorarrays. Has anyone a better solution for the flipping? Andrea > The CoordinateSystem (CS) maps in both "to" and > "from" directions, so in theory this should not > matter. However, there is a problem in VisAD: you > cannot display data defined in the reference (x, y) > coordinates in a Display defined by ScalarMaps of > the (easting, northing) coordinates. If your CS > has reference coordinates (x, y) and you want to > display data defined in (x, y), then your ScalarMaps > must be defined in terms of x and y. > > If you cannot define your Display in terms of > ScalarMaps of x and y, then you will need to extract > the numerical arrays from imageField (read by the > DefaultFamily.open() method) and use them to construct > a new Field defined in terms of a new RealTupleType > (xnew, ynew) with a CS with reference (easting, northing). > > > I try explain better throught some code how I tried to follow you > > suggestions: > > You failed to follow my suggestion because your > GeoToImageCoordinateSystem iCord has reference > (RealType.XAxis, RealType.YAxis) (which should not > be confused with Display.XAxis and Display.YAxis), > but then RealType.XAxis and RealType.YAxis have no > relation to x and y, the domain coordinates of > imageField. Because of this lack of a relation, > the system has no information about how to combine > imageField with domain (x, y) and demField with > domain (easting, northing). > > Also, the statement: > > Field newDemfield = demField.resample(imageDomainSet); > > is unnecessary. This operation will be implicit in > FieldImpl.combine() if there is a CS that defines a > relation between (x, y) and (easting, northing). > > Good luck, > Bill > -- ____________________________________________________________________________ HydroloGIS - Environmental Safety Modelling Siemens Str. 19 via Siemens I-39100 Bozen - Bolzano www.hydrologis.com Andrea Antonello Environmental Engineer tel. +39 0471 068065 mobile: +39 328 8497722 fax: +39 36 328 8497722 email: andrea.antonello@xxxxxxxxxxxxxx "Let it be as much a great honour to take as to give learning, if you want to be called wise." Skuggsja' - The King's mirror - 1240 Reykjavik ____________________________________________________________________________ ============================================================================== To unsubscribe visad, visit: http://www.unidata.ucar.edu/mailing-list-delete-form.html ==============================================================================
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