145 lines
3.7 KiB
Python
145 lines
3.7 KiB
Python
"""Join shapefile data to buildings
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- read through shapes
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- locate building in current database (by centroid)
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- update building with data
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"""
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import json
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import os
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import sys
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import fiona
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import psycopg2
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from shapely.geometry import shape
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def main(source_file, config_path, transform_config_path):
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"""Load config, read files and save features to the database
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"""
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conf = read_config(config_path)
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transform_config = read_config(transform_config_path)
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data_mapping = [
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# from_fieldname, to_fieldname, mapping(old_val, source_val)->new_val
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(from_, to_, eval(transform))
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for from_, to_, transform in transform_config['mapping']
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]
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dbconf = conf['database']
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conn = psycopg2.connect(**dbconf)
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with fiona.open(source_file, 'r') as source:
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epsg_code = transform_config['crs']
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with conn.cursor() as cur:
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for feature in source:
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geometry_id = find_geom(cur, feature, epsg_code)
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if geometry_id is not None:
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save_data(
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cur, feature['properties'], data_mapping, geometry_id)
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else:
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print("Skipping", feature['properties'])
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conn.commit()
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conn.close()
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def save_data(cur, props, data_conf, geometry_id):
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"""Save data to a building
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"""
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cur.execute(
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"""SELECT building_id, building_doc FROM buildings
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WHERE
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geometry_id = %s
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""", (
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geometry_id,
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)
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)
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building = cur.fetchone()
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if building is None:
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doc = update_from_props({}, props, data_conf)
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cur.execute(
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"""INSERT INTO buildings
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(
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building_doc,
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geometry_id
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)
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VALUES
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(
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%s::jsonb,
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%s
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)
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""", (
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json.dumps(doc),
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geometry_id
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)
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)
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else:
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building_id, old_doc = building
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doc = update_from_props(old_doc, props, data_conf)
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cur.execute(
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"""UPDATE buildings
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SET
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building_doc = %s::jsonb
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WHERE
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building_id = %s
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""", (
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json.dumps(doc),
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building_id
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)
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)
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def find_geom(cur, feature, epsg_code):
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"""Find a building geometry
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"""
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cur.execute(
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"""SELECT geometry_id FROM geometries
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WHERE
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ST_Intersects(
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ST_Transform(
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ST_SetSRID(%s::geometry, %s),
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3857
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),
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geometry_geom
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)
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""", (
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shape(feature['geometry']).wkb_hex,
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epsg_code
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)
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)
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result = cur.fetchone()
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if result is not None:
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return result[0]
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else:
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return result
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def update_from_props(doc, props, mapping):
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"""Expect mapping to be a list of transforms
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- from_fieldname (expect to find in source feature['properties'])
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- to_fieldname (expect to create or find in existing doc)
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- transform(old_val, new_val) function/lambda to do any processing
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"""
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for from_, to_, transform in mapping:
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if to_ not in doc:
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doc[to_] = None
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doc[to_] = transform(doc[to_], props[from_])
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return doc
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def read_config(config_path):
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"""Read a JSON config file containing database connection details
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"""
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with open(config_path, 'r') as fh:
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conf = json.load(fh)
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return conf
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if __name__ == '__main__':
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if len(sys.argv) != 4:
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print(
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"Usage: {} ./path/to/source/file.csv ./path/to/dbconfig.json ./path/to/mapping.json".format(
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os.path.basename(__file__)
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))
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exit()
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main(sys.argv[1], sys.argv[2], sys.argv[3])
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