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support multiple polygons #381

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merged 1 commit into from
Jan 7, 2025
Merged

support multiple polygons #381

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28 changes: 18 additions & 10 deletions knime_extension/src/nodes/spatialtool.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1260,31 +1260,38 @@ def configure(self, configure_context, input_schema):
return knext.Schema.from_columns(
[
knext.Column(knext.string(), self._COL_ID),
knext.Column(input_schema[self.geo_col].ktype, self._COL_GEOMETRY),
knext.Column(knut.TYPE_POLYGON, self._COL_GEOMETRY),
]
)

def execute(self, exec_context: knext.ExecutionContext, input_table):
import h3
from shapely.geometry import Polygon
from shapely.geometry import Polygon, mapping
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from shapely.ops import unary_union
import geopandas as gpd
import pandas as pd

gdf_boundary = knut.load_geo_data_frame(input_table, self.geo_col, exec_context)

knut.check_canceled(exec_context)
exec_context.set_progress(0.1, "Projecting input polygon...")
gdf_boundary.to_crs(4326, inplace=True)
USE_CRS = 4326
gdf_boundary.to_crs(USE_CRS, inplace=True)

knut.check_canceled(exec_context)
exec_context.set_progress(0.3, "Combining input polygon...")
gdf_boundary["geometry"] = gdf_boundary.unary_union
gdf_boundary = unary_union(gdf_boundary[self.geo_col])
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gdf_boundary = gpd.GeoDataFrame(geometry=[gdf_boundary], crs=USE_CRS)

knut.check_canceled(exec_context)
exec_context.set_progress(0.4, "Exploding input polygon...")
gdf_boundary = gdf_boundary.explode(index_parts=True)
gdf_boundary.reset_index(drop=True, inplace=True)

knut.check_canceled(exec_context)
exec_context.set_progress(0.5, "Computing H3 hexagons...")
h3_hexes = h3.polyfill_geojson(
gdf_boundary.geometry.__geo_interface__["features"][0]["geometry"],
self.zoom,
h3_hexes = set().union(
*[h3.polyfill_geojson(mapping(p), self.zoom) for p in gdf_boundary.geometry]
)

knut.check_canceled(exec_context)
Expand All @@ -1295,9 +1302,10 @@ def execute(self, exec_context: knext.ExecutionContext, input_table):
Polygon(h3.h3_to_geo_boundary(h3_hex, geo_json=True))
for h3_hex in h3_hexes
],
crs=gdf_boundary.crs,
crs=USE_CRS,
)
grid.rename_geometry(self._COL_GEOMETRY, True)
# rename the geometry column
knut.rename_geometry(grid, self._COL_GEOMETRY)

return knut.to_table(grid, exec_context)

Expand Down Expand Up @@ -1409,7 +1417,7 @@ def execute(self, exec_context: knext.ExecutionContext, input_table):
crs=gdf.crs,
)
# rename the geometry column
grid.rename_geometry(_COL_GEOMETRY, inplace=True)
knut.rename_geometry(grid, _COL_GEOMETRY)

if self.keep_original_table:
grid = pd.concat([gdf, grid], axis=1)
Expand Down
10 changes: 10 additions & 0 deletions knime_extension/src/util/knime_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -472,6 +472,16 @@ def to_table(
return knext.Table.from_pandas(gdf)


def rename_geometry(
gdf: gp.GeoDataFrame, new_name: str = DEF_GEO_COL_NAME
) -> gp.GeoDataFrame:
"""Renames the active geometry column of the given GeoDataFrame if new_name is different."""
if gdf.geometry.name != new_name:
# rename only if the name is different
gdf.rename_geometry(new_name, inplace=True)
return gdf


############################################
# General helper
############################################
Expand Down