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At that point you need to look at the coordinate arrays, which are in projection units. You might find ucar.nc2.dt.grid.GridCoordSystem useful: /** * Given a point in x,y coordinate space, find the x,y index in the coordinate system. * Not implemented yet for 2D. * * @param x_coord position in x coordinate space. * @param y_coord position in y coordinate space. * @param result put result in here, may be null * @return int[2], 0=x,1=y indices in the coordinate system of the point. These will be -1 if out of range. */ public int[] findXYindexFromCoord( double x_coord, double y_coord, int[] result) { if (result == null) result = new int[2]; if ((horizXaxis instanceof CoordinateAxis1D) && (horizYaxis instanceof CoordinateAxis1D)) { result[0] = ((CoordinateAxis1D) horizXaxis).findCoordElement(x_coord); result[1] = ((CoordinateAxis1D) horizYaxis).findCoordElement(y_coord); return result; } else if ((horizXaxis instanceof CoordinateAxis2D) && (horizYaxis instanceof CoordinateAxis2D)) { result[0] = -1; result[1] = -1; return result; //return ((CoordinateAxis2D) xaxis).findXYindexFromCoord( xpos, ypos, result); } // cant happen throw new IllegalStateException("GridCoordSystem.findXYindexFromCoord"); } if you want to use it, open the dataset with ucar.nc2.dt.grid.GridDataset. More info at: http://www.unidata.ucar.edu/software/netcdf-java/tutorial/GridDatatype.html Ticket Details =================== Ticket ID: HZJ-336154 Department: Support THREDDS Priority: Emergency Status: Open