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augmented_diff_import.py
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augmented_diff_import.py
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from twms import projections
import lxml.etree as etree
from shapely.ops import polygonize_full, linemerge
from shapely.geometry import Polygon
def parse_augmented_diff(diff_stream):
geom = {
"delete":
{"way":set(), "node": set(), "relation": set()},
"add":
{"node":{}, "way": {}, 'relation':{}}
}
mode = 'delete'
tags = {}
linestring = []
members = []
context = etree.iterparse(diff_stream, events = ('start', 'end'))
for action, elem in context:
items = dict(elem.items())
if action == "start":
#if elem.tag in ('osm', 'note', 'meta', 'old', 'new', 'bounds', 'tag', 'member', 'nd'):
# continue
if elem.tag in ('node', 'way', 'relation'):
tags = {}
linestring = []
if items.get('visible') == 'false':
mode = 'delete'
#if mode == 'delete':
geom['delete'][elem.tag].add(int(items['id']))
elif elem.tag == 'member':
linestring = []
elif elem.tag == 'action':
if items['type'] == 'delete':
mode = 'delete'
else:
mode = 'add'
elif elem.tag == 'old':
mode = 'delete'
elif elem.tag == 'new':
mode = 'add'
elif elem.tag == 'nd':
linestring.append((float(items['lon']), float(items['lat'])))
elif action == "end":
if mode == 'add':
if elem.tag == 'tag':
tags[items['k']] = items['v']
elif elem.tag == 'node':
if tags:
geom[mode][elem.tag][int(items['id'])] = {'geom': (float(items['lon']), float(items['lat'])), 'tags': tags}
elif elem.tag == 'way':
if tags:
geom[mode][elem.tag][int(items['id'])] = {'geom': linestring, 'tags': tags}
elif elem.tag == 'member':
if linestring:
members.append(linestring)
elif elem.tag == 'relation':
if tags and members:
if tags.get('type') in ('multipolygon', 'route', 'boundary'):
geom[mode][elem.tag][int(items['id'])] = {'geom': members, 'tags': tags}
continue
#print action, elem
return geom
def check_tags_if_polygon(tags):
return True
def build_deletes(diff, db_options = {"prefix": "planet_osm"}):
sql = []
if diff["delete"]["node"]:
ids = list(diff["delete"]["node"])
ids.sort()
sql.append("DELETE FROM {prefix}_point where osm_id in (".format(**db_options)+ ",".join([str(i) for i in ids]) +");")
ids = list(diff["delete"]["way"])
ids += [-i for i in diff["delete"]["relation"]]
if ids:
ids.sort()
sql.append("DELETE FROM {prefix}_line where osm_id in (".format(**db_options)+ ",".join([str(i) for i in ids]) +");")
sql.append("DELETE FROM {prefix}_polygon where osm_id in (".format(**db_options)+ ",".join([str(i) for i in ids]) +");")
return sql
def merge_rings(lines):
rings = []
unclosed = []
while lines:
cur_line = lines.pop()
if cur_line[0] == cur_line[-1]:
rings.append(cur_line)
else:
unclosed.append(cur_line)
def build_geometries(diff, srid):
srid_txt = "EPSG:{}".format(srid)
geom = {'line': [], 'point': [], 'polygon': []}
for osm_id, node in diff['add']['node'].iteritems():
x, y = projections.from4326(node["geom"], srid_txt)
geom["point"].append({"geom": "SRID={};POINT({} {})".format(srid, x, y), "osm_id": osm_id, "tags": node["tags"]})
for osm_id, way in diff['add']['way'].iteritems():
line = projections.from4326(way["geom"], srid_txt)
polygonize = check_tags_if_polygon(way["tags"])
if polygonize:
result, dangles, cuts, invalids = polygonize_full([line])
#print result, dangles, cuts, invalids
for poly in result:
geom["polygon"].append({"geom": "SRID={};{}".format(srid, poly.wkt), "osm_id": osm_id, "way_area":poly.area, "tags": way["tags"]})
for line in dangles:
geom["line"].append({"geom": "SRID={};{}".format(srid, line.wkt), "osm_id": osm_id, "tags": way["tags"]})
for line in cuts:
geom["line"].append({"geom": "SRID={};{}".format(srid, line.wkt), "osm_id": osm_id, "tags": way["tags"]})
for line in invalids:
geom["line"].append({"geom": "SRID={};{}".format(srid, line.wkt), "osm_id": osm_id, "tags": way["tags"]})
else:
ll = ",".join([a[0] + a[1] for a in line])
geom["line"].append({"geom": "SRID={};LINESTRING({})".format(srid, ll), "osm_id": osm_id, "tags": way["tags"]})
for osm_id, relation in diff['add']['relation'].iteritems():
lines = [projections.from4326(way, srid_txt) for way in relation["geom"]]
polygonize = check_tags_if_polygon(relation["tags"])
if polygonize:
merged = linemerge(lines)
polys = []
lines = []
for line in merged:
if line.is_ring:
polys.append(line)
else:
lines.append(line)
if polys:
# TODO: repair geometry
poly = Polygon(polys[0], polys[1:])
geom["polygon"].append({"geom": "SRID={};{}".format(srid, poly.wkt), "osm_id": -osm_id, "way_area":0, "tags": relation["tags"]})
for line in lines:
geom["line"].append({"geom": "SRID={};{}".format(srid, line.wkt), "osm_id": -osm_id, "tags": relation["tags"]})
#result, dangles, cuts, invalids = polygonize_full(lines)
##print result, dangles, cuts, invalids
#result = list(result)
#sd = result[0]
#for poly in result[1:]:
#sd = sd.symmetric_difference(poly)
#geom["polygon"].append({"geom": "SRID={};{}".format(srid, sd.wkt), "osm_id": -osm_id, "way_area":sd.area, "tags": relation["tags"]})
#for line in dangles:
#geom["line"].append({"geom": "SRID={};{}".format(srid, line.wkt), "osm_id": -osm_id, "tags": relation["tags"]})
#for line in cuts:
#geom["line"].append({"geom": "SRID={};{}".format(srid, line.wkt), "osm_id": -osm_id, "tags": relation["tags"]})
else:
ll = ",".join([a[0] + a[1] for a in line])
geom["line"].append({"geom": "SRID={};LINESTRING({})".format(srid, ll), "osm_id": osm_id, "tags": relation["tags"]})
return geom
def braindead_psql_inserter(geom, db_options = {"prefix": "planet_osm"}):
sql = []
for geom_type, geoms in geom.iteritems():
for feature in geoms:
sql.append("insert into {prefix}_{geom_type} (osm_id, way) values ({osm_id}, '{geom}');".format(**{"prefix": db_options["prefix"], "geom_type": geom_type, "osm_id": feature["osm_id"], "geom": feature["geom"]}))
return sql
if __name__ == '__main__':
augmented_diff = open('adiff.xml', 'r')
diff = parse_augmented_diff(augmented_diff)
sql = build_deletes(diff)
geom = build_geometries(diff, 900913)
sql += braindead_psql_inserter(geom)
for q in sql:
print q