def __init__(self, params, bbox, region, proj_srs, cap_file=None):
"""!Initializes data needed for iteration through tiles.
"""
self.proj_srs = proj_srs
self.meters_per_unit = None
# constant defined in WMTS standard (in meters)
self.pixel_size = 0.00028
# parse capabilities file
try:
# checks all elements needed by this class,
# invalid elements are removed
cap_tree = WMTSCapabilitiesTree(cap_file)
except ParseError as error:
grass.fatal(
_("Unable to parse tile service file.\n%s\n") % str(error))
self.xml_ns = cap_tree.getxmlnshandler()
root = cap_tree.getroot()
# get layer tile matrix sets with required projection
mat_sets = self._getMatSets(
root, params['layers'],
params['srs']) #[[TileMatrixSet, TileMatrixSetLink], ....]
# TODO: what if more tile matrix sets have required srs (returned more than 1)?
mat_set = mat_sets[0][0]
mat_set_link = mat_sets[0][1]
params['tile_matrix_set'] = mat_set.find(
self.xml_ns.NsOws('Identifier')).text
# find tile matrix with resolution closest and smaller to wanted resolution
tile_mat = self._findTileMats(
mat_set.findall(self.xml_ns.NsWmts('TileMatrix')), region, bbox)
# get extend of data available on server expressed in max/min rows and cols of tile matrix
mat_num_bbox = self._getMatSize(tile_mat, mat_set_link)
# initialize data needed for iteration through tiles
self._computeRequestData(tile_mat, params, bbox, mat_num_bbox)
def __init__(self, params, bbox, region, proj_srs, cap_file=None):
"""!Initializes data needed for iteration through tiles.
"""
self.proj_srs = proj_srs
self.meters_per_unit = None
# constant defined in WMTS standard (in meters)
self.pixel_size = 0.00028
# parse capabilities file
try:
# checks all elements needed by this class,
# invalid elements are removed
cap_tree = WMTSCapabilitiesTree(cap_file)
except ParseError as error:
grass.fatal(_("Unable to parse tile service file.\n%s\n") % str(error))
self.xml_ns = cap_tree.getxmlnshandler()
root = cap_tree.getroot()
# get layer tile matrix sets with required projection
# [[TileMatrixSet, TileMatrixSetLink], ....]
mat_sets = self._getMatSets(root, params['layers'], params['srs'])
# TODO: what if more tile matrix sets have required srs (returned more than 1)?
mat_set = mat_sets[0][0]
mat_set_link = mat_sets[0][1]
params['tile_matrix_set'] = mat_set.find(self.xml_ns.NsOws('Identifier')).text
# find tile matrix with resolution closest and smaller to wanted resolution
tile_mat = self._findTileMats(mat_set.findall(
self.xml_ns.NsWmts('TileMatrix')), region, bbox)
# get extend of data available on server expressed in max/min rows and cols of tile matrix
mat_num_bbox = self._getMatSize(tile_mat, mat_set_link)
# initialize data needed for iteration through tiles
self._computeRequestData(tile_mat, params, bbox, mat_num_bbox, self._getMatSetSrs(mat_set))
