def get_env_selector(self, maptable, env_col, other_col,
columns, conditions=[]):
sel = NamedMatrix(square=False)
sel.set_columns(columns)
sel.set_rows(self.get_sectors())
stmt = self.generate_map_stmt(maptable, env_col, other_col, conditions)
result = stmt()
for row in result:
if sel.has_row(row[0]) and sel.has_column(row[1]):
sel.set_element(row[0], row[1], 1)
return sel
