/**
* Create a new GeoGrid that is a logical subset of this GeoGrid.
*
* @param t_range subset the time dimension, or null if you want all of it
* @param z_range subset the vertical dimension, or null if you want all of it
* @param bbox a lat/lon bounding box, or null if you want all x,y
* @param z_stride use only if z_range is null, then take all z with this stride (1 means all)
* @param y_stride use this stride on the y coordinate (1 means all)
* @param x_stride use this stride on the x coordinate (1 means all)
* @return subsetted GeoGrid
* @throws InvalidRangeException if bbox does not intersect GeoGrid
*/
public GeoGrid subset(
Range t_range, Range z_range, LatLonRect bbox, int z_stride, int y_stride, int x_stride)
throws InvalidRangeException {
if ((z_range == null) && (z_stride > 1)) {
Dimension zdim = getZDimension();
if (zdim != null) z_range = new Range(0, zdim.getLength() - 1, z_stride);
}
Range y_range = null, x_range = null;
if (bbox != null) {
List yx_ranges = gcs.getRangesFromLatLonRect(bbox);
y_range = (Range) yx_ranges.get(0);
x_range = (Range) yx_ranges.get(1);
}
if (y_stride > 1) {
if (y_range == null) {
Dimension ydim = getYDimension();
y_range = new Range(0, ydim.getLength() - 1, y_stride);
} else {
y_range = new Range(y_range.first(), y_range.last(), y_stride);
}
}
if (x_stride > 1) {
if (x_range == null) {
Dimension xdim = getXDimension();
x_range = new Range(0, xdim.getLength() - 1, x_stride);
} else {
x_range = new Range(x_range.first(), x_range.last(), x_stride);
}
}
return subset(t_range, z_range, y_range, x_range);
}
