grass.temporal.temporal_raster3d_algebra — GRASS Python Library documentation

# Source code for grass.temporal.temporal_raster3d_algebra

    """!@package grass.temporal

    Temporal raster algebra

    (C) 2013 by the GRASS Development Team
    This program is free software under the GNU General Public
    License (>=v2). Read the file COPYING that comes with GRASS
    for details.

    :authors: Thomas Leppelt and Soeren Gebbert

    """

    try:
        import ply.yacc as yacc
    except ImportError:
        pass

    from .temporal_raster_base_algebra import (
        TemporalRasterBaseAlgebraParser,
        TemporalRasterAlgebraLexer,
    )
    import grass.pygrass.modules as pymod
    from .space_time_datasets import Raster3DDataset

    class TemporalRaster3DAlgebraParser(TemporalRasterBaseAlgebraParser):
        """The temporal raster algebra class"""

        def __init__(
            self,
            pid=None,
            run=False,
            debug=True,
            spatial=False,
            register_null=False,
            dry_run=False,
            nprocs=1,
        ):
            TemporalRasterBaseAlgebraParser.__init__(
                self,
                pid=pid,
                run=run,
                debug=debug,
                spatial=spatial,
                register_null=register_null,
                dry_run=dry_run,
                nprocs=nprocs,
            )

            self.m_mapcalc = pymod.Module("r3.mapcalc")
            self.m_mremove = pymod.Module("g.remove")

        def parse(self, expression, basename=None, overwrite=False):
            # Check for space time dataset type definitions from temporal algebra
            l = TemporalRasterAlgebraLexer()
            l.build()
            l.lexer.input(expression)

            while True:
                tok = l.lexer.token()
                if not tok:
                    break

                if tok.type == "STVDS" or tok.type == "STRDS" or tok.type == "STR3DS":
                    raise SyntaxError("Syntax error near '%s'" % (tok.type))

            self.lexer = TemporalRasterAlgebraLexer()
            self.lexer.build()
            self.parser = yacc.yacc(module=self, debug=self.debug, write_tables=False)

            self.overwrite = overwrite
            self.count = 0
            self.stdstype = "str3ds"
            self.maptype = "raster_3d"
            self.mapclass = Raster3DDataset
            self.basename = basename
            self.expression = expression
            self.parser.parse(expression)

            return self.process_chain_dict

        def p_statement_assign(self, t):
            # The expression should always return a list of maps.
            """
            statement : stds EQUALS expr
            """
            TemporalRasterBaseAlgebraParser.p_statement_assign(self, t)

        def p_ts_neighbor_operation(self, t):
            # Examples:
            # A[1,0,-1]
            # B[-2]
            # C[1,-2,1,3]
            """
            expr : stds L_SPAREN number COMMA number COMMA number R_SPAREN
                 | stds L_SPAREN number R_SPAREN
                 | stds L_SPAREN number COMMA number COMMA number COMMA number R_SPAREN
            """
            # Check input stds.
            maplist = self.check_stds(t[1])
            t_neighbor = 0
            row_neighbor = None
            col_neighbor = None
            depth_neighbor = None
            if len(t) == 5:
                t_neighbor = t[3]
            elif len(t) == 9:
                row_neighbor = t[3]
                col_neighbor = t[5]
                depth_neighbor = t[7]
            elif len(t) == 11:
                t_neighbor = t[9]
                row_neighbor = t[3]
                col_neighbor = t[5]
                depth_neighbor = t[7]
            if self.run:
                resultlist = []
                max_index = len(maplist)
                for map_i in maplist:
                    # Get map index and temporal extent.
                    map_index = maplist.index(map_i)
                    new_index = map_index + t_neighbor
                    if new_index < max_index and new_index >= 0:
                        map_i_t_extent = map_i.get_temporal_extent()
                        # Get neighboring map and set temporal extent.
                        map_n = maplist[new_index]
                        # Generate an intermediate map for the result map list.
                        map_new = self.generate_new_map(map_n, bool_op="and", copy=True)
                        map_new.set_temporal_extent(map_i_t_extent)
                        # Create r.mapcalc expression string for the operation.
                        if "cmd_list" in dir(map_new) and len(t) == 5:
                            cmdstring = "%s" % (map_new.cmd_list)
                        elif "cmd_list" not in dir(map_new) and len(t) == 5:
                            cmdstring = "%s" % (map_n.get_id())
                        elif "cmd_list" in dir(map_new) and len(t) in (9, 11):
                            cmdstring = "%s[%s,%s,%s]" % (
                                map_new.cmd_list,
                                row_neighbor,
                                col_neighbor,
                                depth_neighbor,
                            )
                        elif "cmd_list" not in dir(map_new) and len(t) in (9, 11):
                            cmdstring = "%s[%s,%s,%s]" % (
                                map_n.get_id(),
                                row_neighbor,
                                col_neighbor,
                                depth_neighbor,
                            )
                        # Set new command list for map.
                        map_new.cmd_list = cmdstring
                        # Append map with updated command list to result list.
                        resultlist.append(map_new)

                t[0] = resultlist

    if __name__ == "__main__":
        import doctest

        doctest.testmod()

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