# [THREDDS #HZJ-336154]: Fwd: Re: Web Services to NAM12K

```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

```
• 2007 messages navigation, sorted by:
• Search the `thredds` archives: