class_docstr: Projects Polygons and Path Elements from their source coordinate
  reference system to the supplied projection.
class_docstr_tok: ["Projects","Polygons","and","Path","Elements","from","their","source","coordinate","reference","system","to","the","supplied","projection","."]
code: def _process_element(self, element):
      if not bool(element):
          return element.clone(crs=self.p.projection)
  
      crs = element.crs
      proj = self.p.projection
      if (
          isinstance(crs, ccrs.PlateCarree)
          and not isinstance(proj, ccrs.PlateCarree)
          and crs.proj4_params["lon_0"] != 0
      ):
          element = self.instance(projection=ccrs.PlateCarree())(
              element
          )
  
      if isinstance(proj, ccrs.CRS) and not isinstance(
          proj, ccrs.Projection
      ):
          raise ValueError(
              "invalid transform:"
              " Spherical contouring is not supported - "
              " consider using PlateCarree/RotatedPole."
          )
  
      if isinstance(element, Polygons):
          geoms = polygons_to_geom_dicts(element, skip_invalid=False)
      else:
          geoms = path_to_geom_dicts(element, skip_invalid=False)
  
      projected = []
      for path in geoms:
          geom = path["geometry"]
  
          # Ensure minimum area for polygons (precision issues cause errors)
          if isinstance(geom, Polygon) and geom.area < 1e-15:
              continue
          elif isinstance(geom, MultiPolygon):
              polys = [g for g in geom.geoms if g.area > 1e-15]
              if not polys:
                  continue
              geom = MultiPolygon(polys)
          elif not geom or isinstance(geom, GeometryCollection):
              continue
  
          proj_geom = proj.project_geometry(geom, element.crs)
  
          # Attempt to fix geometry without being noisy about it
          logger = logging.getLogger()
          try:
              prev = logger.level
              logger.setLevel(logging.ERROR)
              if not proj_geom.is_valid:
                  proj_geom = proj.project_geometry(
                      geom.buffer(0), element.crs
                  )
          except Exception:
              continue
          finally:
              logger.setLevel(prev)
          if (
              proj_geom.geom_type
              in ["GeometryCollection", "MultiPolygon"]
              and len(proj_geom.geoms) == 0
          ):
              continue
          data = dict(path, geometry=proj_geom)
          if "holes" in data:
              data.pop("holes")
          projected.append(data)
  
      if len(geoms) and len(projected) == 0:
          element_name = type(element).__name__
          crs_name = type(element.crs).__name__
          proj_name = type(self.p.projection).__name__
          self.param.warning(
              f"While projecting a {element_name} element from a {crs_name} coordinate "
              f"reference system (crs) to a {proj_name} projection none of "
              "the projected paths were contained within the bounds "
              "specified by the projection. Ensure you have specified "
              "the correct coordinate system for your data."
          )
  
      # Try casting back to original types
      if element.interface is GeoPandasInterface:
          import geopandas as gpd
  
          projected = gpd.GeoDataFrame(
              projected, columns=element.data.columns
          )
      elif element.interface is MultiInterface:
          x, y = element.kdims
          item = element.data[0] if element.data else None
          if item is None or (
              isinstance(item, dict) and "geometry" in item
          ):
              return element.clone(projected, crs=self.p.projection)
          projected = [
              geom_dict_to_array_dict(p, [x.name, y.name])
              for p in projected
          ]
          if any("holes" in p for p in projected):
              pass
          elif pd and isinstance(item, pd.DataFrame):
              projected = [
                  pd.DataFrame(p, columns=item.columns)
                  for p in projected
              ]
          elif isinstance(item, np.ndarray):
              projected = [
                  np.column_stack(
                      [p[d.name] for d in element.dimensions()]
                  )
                  for p in projected
              ]
      return element.clone(projected, crs=self.p.projection)
  
imports: import logging
  import sys
  import param
  import numpy
  import pandas
  from cartopy import crs
  from holoviews.core.data import MultiInterface
  from holoviews.core.util import cartesian_product, get_param_values
  from holoviews.operation import Operation
  from shapely.geometry import Polygon, MultiPolygon
  from shapely.geometry.collection import GeometryCollection
  from ..data import GeoPandasInterface
  from ..element import Image, Shape, Polygons, Path, Points, Contours, RGB, Graph, Nodes, EdgePaths, QuadMesh, VectorField, HexTiles, Labels, Rectangles, Segments, WindBarbs
  from ..util import project_extents, path_to_geom_dicts, polygons_to_geom_dicts, geom_dict_to_array_dict
label_desc: Use image node_id 1 for calling the project_path obj's underlying member method code with example usage: obj._process_element(element) and returns: element, element, element