/**
* Compute DEM traversal step sizes (in degree) in latitude and longitude.
*
* @throws Exception The exceptions.
*/
private void computeDEMTraversalSampleInterval() throws Exception {
double[] latLonMinMax = new double[4];
computeImageGeoBoundary(0, sourceImageWidth - 1, 0, sourceImageHeight - 1, latLonMinMax);
final double groundRangeSpacing = SARGeocoding.getRangePixelSpacing(sourceProduct);
final double azimuthPixelSpacing = SARGeocoding.getAzimuthPixelSpacing(sourceProduct);
final double spacing = Math.min(groundRangeSpacing, azimuthPixelSpacing);
// final double spacing = (groundRangeSpacing + azimuthPixelSpacing)/2.0;
final double latMin = latLonMinMax[0];
final double latMax = latLonMinMax[1];
double minAbsLat;
if (latMin * latMax > 0) {
minAbsLat = Math.min(Math.abs(latMin), Math.abs(latMax)) * Constants.DTOR;
} else {
minAbsLat = 0.0;
}
delLat = spacing / Constants.MeanEarthRadius * Constants.RTOD;
delLon = spacing / (Constants.MeanEarthRadius * FastMath.cos(minAbsLat)) * Constants.RTOD;
delLat = Math.min(delLat, delLon); // (delLat + delLon)/2.0;
delLon = delLat;
}
