gridSetId = gridSubset.getName();
Envelope bbox = request.getBbox();
BoundingBox tileBounds = new BoundingBox(bbox.getMinX(), bbox.getMinY(),
bbox.getMaxX(), bbox.getMaxY());
try {
tileIndex = gridSubset.closestIndex(tileBounds);
} catch (GridMismatchException e) {
return null;
}
Map<String, String> fullParameters = null;