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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Hi Helen, I can't see any problem with your attched code, and we have tested Irregular2DSet, so the only thing I can think of is that there is some problem with the way you are computing the pixLat, pixLon and pixTemp arrays that are input to the attached code. For one thing, the size of triangles in your bottom image is too large compared with the resolution of your top image. Second, the axes in the top image are in pixels whereas the axes in the bottom image are in lat and lon. Third, given a significant fraction of 600x200 pixel locations as input, the Irregular2DSet constructor should take a very long time to compute, because of its calls to a Delaunay algorithm. Good luck, Bill ---------------------------------------------------------- Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706 hibbard@xxxxxxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738 http://www.ssec.wisc.edu/~billh/vis.html On Thu, 11 Apr 2002, Helen Yi wrote: > > Hi, > > I need some help to mapping my Row_Col plot onto a Lat-Lon domain. > > As you can see from the first gif image displayed at > "http://enso.larc.nasa.gov/~helen/";, > the temperature image has been drawn with 600 (col) X 210 (row) > pixels. > The temperature, latitude and longitude of each (non-blue region) pixel > are known > but those information for pixels in the blue region are missing. > > I want to display those pixels with non-missing temp, lat and lon on a > Lat-Lon domain > (see second image at "http://enso.larc.nasa.gov/~helen/";). > > Suppose I am able to pick or select NPIXELS valid pixels from 600x200 > pixels, and > save the pixels information in float [NPIXELS] pixTemp, pixLat, pixLon; > > I did the followings and get the display as showed in attached > irreg_snap.gif. > It seems that Irregular2DSet does not give reasonable result. > Can someone point me a right direction I can turn to? > > Thank you very much. > > -Helen > > ----- stat here is what I did ---------------- > domain_tuple = new RealTupleType(RealType.Latitude, RealType.Longitude); > > pixel = new RealType("PIXEL"); > > func_dom_pix = new FunctionType( domain_tuple, pixel); > > float [][] pxloc_array = new float[2][npixels]; > > for (int ii = 0; ii<NPIXELS; ii++) { > > pxloc_array[0][ii] = pixLat[ii]; > pxloc_array[1][ii] = pixLon[ii]; > } > > float[][] flat_samples = new float[1][NPIXELS]; > > > for(int j = 0; j < NPIXELS; j++) > flat_samples[0][ j ] = pixTemp[j]; > > > Irregular2DSet iSet2D = new Irregular2DSet(domain_tuple, pxloc_array); > > vals_ff = new FlatField( func_dom_pix, iSet2D); > > vals_ff.setSamples( flat_samples ); > > display = new DisplayImplJ2D("display1"); > > GraphicsModeControl dispGMC = (GraphicsModeControl) > display.getGraphicsModeControl(); > dispGMC.setScaleEnable(true); > > lonMap = new ScalarMap( RealType.Longitude, Display.XAxis ); > latMap = new ScalarMap( RealType.Latitude, Display.YAxis ); > pixMap = new ScalarMap( pixel, Display.RGB ); > > display.addMap( latMap ); > display.addMap( lonMap ); > display.addMap( pixMap ); > > data_ref = new DataReferenceImpl("data_ref"); > > data_ref.setData( vals_ff ); > > display.addReference( data_ref ); > > > -----------end of what I did---------- >
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