Add .gitignore

.gitignore

@@ -0,0 +1,2 @@
+__pycache__
+.mypy_cache/

geocode/database.py

@@ -0,0 +1,25 @@
+from sqlalchemy import create_engine, func
+from sqlalchemy.orm import scoped_session, sessionmaker
+
+session = scoped_session(sessionmaker())
+
+
+def init_db(db_url):
+    session.configure(bind=get_engine(db_url))
+
+
+def get_engine(db_url, echo=False):
+    return create_engine(db_url, pool_recycle=3600, echo=echo)
+
+
+def init_app(app, echo=False):
+    db_url = app.config["DB_URL"]
+    session.configure(bind=get_engine(db_url, echo=echo))
+
+    @app.teardown_appcontext
+    def shutdown_session(exception=None):
+        session.remove()
+
+
+def now_utc():
+    return func.timezone("utc", func.now())

geocode/model.py

@@ -0,0 +1,57 @@
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.schema import Column
+from sqlalchemy.types import Integer, Float, Numeric, String
+from sqlalchemy.dialects import postgresql
+from sqlalchemy.orm import column_property
+from sqlalchemy.ext.hybrid import hybrid_property
+from sqlalchemy import func, cast
+
+from geoalchemy2 import Geometry
+from .database import session
+
+Base = declarative_base()
+Base.query = session.query_property()
+
+class Polygon(Base):
+    __tablename__ = "planet_osm_polygon"
+
+    osm_id = Column(Integer, primary_key=True, autoincrement=False)
+    admin_level = Column(String)
+
+    way_area = Column(Float)
+    tags = Column(postgresql.HSTORE)
+    way = Column(Geometry("GEOMETRY", srid=4326, spatial_index=True), nullable=False)
+    area = column_property(func.ST_Area(way, False))
+
+    @property
+    def osm_url(self):
+        osm_type = "way" if self.osm_id > 0 else "relation"
+        return f"https://www.openstreetmap.org/{osm_type}/{abs(self.osm_id)}"
+
+    @hybrid_property
+    def area_in_sq_km(self):
+        return self.area / (1000 * 1000)
+
+    @classmethod
+    def coords_within(cls, lat, lon):
+        point = func.ST_SetSRID(func.ST_MakePoint(lon, lat), 4326)
+        return (cls.query.filter(cls.admin_level.isnot(None),
+                                 cls.admin_level.regexp_match("^\d+$"),
+                                 func.ST_Within(point, cls.way))
+                         .order_by(cls.area, cast(cls.admin_level, Integer).desc()))
+
+class Scotland(Base):
+    __tablename__ = "scotland"
+
+    gid = Column(Integer, primary_key=True)
+    shape_leng = Column(Numeric)
+    shape_area = Column(Numeric)
+    code = Column(String(3))
+    c91code1 = Column(String(5))
+    c91code2 = Column(String(5))
+    c91code3 = Column(String(5))
+    c91code4 = Column(String(5))
+    name = Column(String(50))
+
+    geom = Column(Geometry("MULTIPOLYGON", srid=27700))
+

geocode/overpass.py

@@ -1,36 +0,0 @@
-from flask import current_app
-from . import headers
-import os
-import json
-import requests
-
-OVERPASS_URL = "https://lz4.overpass-api.de"
-
-
-def run_query(oql):
-    return requests.post(
-        OVERPASS_URL + "/api/interpreter", data=oql.encode("utf-8"), headers=headers
-    )
-
-
-def is_in_lat_lon(lat, lon):
-    oql = f"""
-[out:json][timeout:25];
-is_in({lat},{lon})->.a;
-(way(pivot.a); rel(pivot.a););
-out bb tags qt;"""
-
-    return run_query(oql)
-
-
-def get_osm_elements(lat, lon):
-    filename = f"cache/{lat}_{lon}.json"
-    use_cache = current_app.config["USE_CACHE"]
-
-    if use_cache and os.path.exists(filename):
-        return json.load(open(filename))["elements"]
-
-    r = is_in_lat_lon(lat, lon)
-    if use_cache:
-        open(filename, "wb").write(r.content)
-    return r.json()["elements"]

geocode/scotland.py

@@ -0,0 +1,12 @@
+from flask import current_app
+import psycopg2
+
+def get_scotland_code(lat, lon):
+    conn = psycopg2.connect(**current_app.config["DB_PARAMS"])
+    cur = conn.cursor()
+
+    point = f"ST_Transform(ST_SetSRID(ST_MakePoint({lon}, {lat}), 4326), 27700)"
+    cur.execute(f"select code, name from scotland where st_contains(geom, {point});")
+    row = cur.fetchone()
+    conn.close()
+    return row[0] if row else None

geocode/wikidata.py

@@ -1,8 +1,12 @@
+from flask import render_template
 import requests
 import simplejson
 from . import headers
+import urllib.parse
 
 wikidata_query_api_url = "https://query.wikidata.org/bigdata/namespace/wdq/sparql"
+wd_entity = "http://www.wikidata.org/entity/Q"
+commons_cat_start = "https://commons.wikimedia.org/wiki/Category:"
 
 
 class QueryError(Exception):
@@ -49,3 +53,110 @@ def wdqs(query):
         return r.json()["results"]["bindings"]
     except simplejson.errors.JSONDecodeError:
         raise QueryError(query, r)
+
+
+def wd_to_qid(wd):
+    # expecting {"type": "url", "value": "https://www.wikidata.org/wiki/Q30"}
+    if wd["type"] == "uri":
+        return wd_uri_to_qid(wd["value"])
+
+
+def wd_uri_to_qid(value):
+    assert value.startswith(wd_entity)
+    return value[len(wd_entity) - 1 :]
+
+def geosearch_query(lat, lon):
+    if isinstance(lat, float):
+        lat = f"{lat:f}"
+    if isinstance(lon, float):
+        lon = f"{lon:f}"
+
+    query = render_template("sparql/geosearch.sparql", lat=lat, lon=lon)
+    return wdqs(query)
+
+
+def geosearch(lat, lon):
+    default_max_dist = 1
+    rows = geosearch_query(lat, lon)
+    max_dist = {
+        "Q188509": 1,  # suburb
+        "Q3957": 2,  # town
+        "Q532": 1,  # village
+        "Q5084": 1,  # hamlet
+        "Q515": 2,  # city
+        "Q1549591": 3,  # big city
+    }
+    for row in rows:
+        isa = wd_uri_to_qid(row["isa"]["value"])
+
+        if (
+            "commonsCat" not in row
+            and "commonsSiteLink" not in row
+            and isa not in max_dist
+        ):
+            continue
+
+        distance = float(row["distance"]["value"])
+        if distance > max_dist.get(isa, default_max_dist):
+            continue
+
+        if "commonsCat" not in row and "commonsSiteLink" not in row:
+            break
+
+        return row
+
+
+def lookup_scottish_parish_in_wikidata(code):
+    query = render_template("sparql/scottish_parish.sparql", code=code)
+    return wdqs(query)
+
+
+def lookup_gss_in_wikidata(gss):
+    query = render_template("sparql/lookup_gss.sparql", gss=gss)
+    return wdqs(query)
+
+
+def lookup_wikidata_by_name(name, lat, lon):
+    query = render_template(
+        "sparql/lookup_by_name.sparql", name=repr(name), lat=str(lat), lon=str(lon)
+    )
+    return wdqs(query)
+
+
+def unescape_title(t):
+    return urllib.parse.unquote(t.replace("_", " "))
+
+
+def commons_from_rows(rows):
+    for row in rows:
+        if "commonsCat" in row:
+            qid = wd_to_qid(row["item"])
+            return {"wikidata": qid, "commons_cat": row["commonsCat"]["value"]}
+        if "commonsSiteLink" in row:
+            site_link = row["commonsSiteLink"]["value"]
+            qid = wd_to_qid(row["item"])
+            cat = unescape_title(site_link[len(commons_cat_start) :])
+            return {"wikidata": qid, "commons_cat": cat}
+
+
+def get_commons_cat_from_gss(gss):
+    return commons_from_rows(lookup_gss_in_wikidata(gss))
+
+
+def build_dict(hit, lat, lon):
+    coords = {"lat": lat, "lon": lon}
+    if hit is None:
+        return dict(commons_cat=None, missing=True, coords=coords)
+    commons_cat = hit["commons_cat"]
+    ret = dict(
+        coords=coords,
+        admin_level=hit.get("admin_level"),
+        wikidata=hit["wikidata"],
+    )
+    if not commons_cat:
+        return ret
+
+    url = commons_cat_start + urllib.parse.quote(commons_cat.replace(" ", "_"))
+    ret["commons_cat"] = {"title": commons_cat, "url": url}
+
+    return ret

lookup.py

@@ -1,24 +1,14 @@
 #!/usr/bin/python3
 
 from flask import Flask, render_template, request, jsonify, redirect, url_for
+from geocode import wikidata, scotland, database, model
 import geocode
-import geocode.wikidata
-import geocode.overpass
-import urllib.parse
 import random
-import psycopg2
-from geopy.distance import distance
 
-# select gid, code, name from scotland where st_contains(geom, ST_Transform(ST_SetSRID(ST_MakePoint(-4.177, 55.7644), 4326), 27700));
-
-commons_cat_start = "https://commons.wikimedia.org/wiki/Category:"
-
-wd_entity = "http://www.wikidata.org/entity/Q"
 city_of_london_qid = "Q23311"
-
-
 app = Flask(__name__)
 app.config.from_object("config.default")
+database.init_app(app)
 
 
 def get_random_lat_lon():
@@ -33,191 +23,54 @@ def get_random_lat_lon():
     return lat, lon
 
 
-def bounding_box_area(element):
-    bbox = element["bounds"]
-
-    x = distance((bbox["maxlat"], bbox["minlon"]), (bbox["maxlat"], bbox["maxlon"]))
-    y = distance((bbox["minlat"], bbox["maxlon"]), (bbox["maxlat"], bbox["minlon"]))
-
-    return x.km * y.km
-
-
-def wd_to_qid(wd):
-    # expecting {"type": "url", "value": "https://www.wikidata.org/wiki/Q30"}
-    if wd["type"] == "uri":
-        return wd_uri_to_qid(wd["value"])
-
-
-def wd_uri_to_qid(value):
-    assert value.startswith(wd_entity)
-    return value[len(wd_entity) - 1 :]
-
-
-def build_dict(hit, lat, lon):
-    coords = {"lat": lat, "lon": lon}
-    if hit is None:
-        return dict(commons_cat=None, missing=True, coords=coords)
-    commons_cat = hit["commons_cat"]
-    url = commons_cat_start + urllib.parse.quote(commons_cat.replace(" ", "_"))
-    return dict(
-        commons_cat={"title": commons_cat, "url": url},
-        coords=coords,
-        admin_level=hit.get("admin_level"),
-        wikidata=hit["wikidata"],
-    )
-
-
 def do_lookup(elements, lat, lon):
     try:
         hit = osm_lookup(elements, lat, lon)
-    except geocode.wikidata.QueryError as e:
+    except wikidata.QueryError as e:
         return {
             "query": e.query,
             "error": e.r.text,
             "query_url": "https://query.wikidata.org/#" + e.query,
         }
 
-    return build_dict(hit, lat, lon)
-
-
-def get_scotland_code(lat, lon):
-    conn = psycopg2.connect(**app.config["DB_PARAMS"])
-    cur = conn.cursor()
-
-    point = f"ST_Transform(ST_SetSRID(ST_MakePoint({lon}, {lat}), 4326), 27700)"
-    cur.execute(f"select code, name from scotland where st_contains(geom, {point});")
-    row = cur.fetchone()
-
-    # expand search, disabled for now 2020-04-20
-    if not row:
-        cur.execute(
-            f"select code, name from scotland where ST_DWithin(geom, {point}, 100);"
-        )
-        row = cur.fetchone()
-
-    conn.close()
-    if row:
-        return row[0]
-
-
-def wdqs_geosearch_query(lat, lon):
-    if isinstance(lat, float):
-        lat = f"{lat:f}"
-    if isinstance(lon, float):
-        lon = f"{lon:f}"
-
-    query = render_template("sparql/geosearch.sparql", lat=lat, lon=lon)
-    return geocode.wikidata.wdqs(query)
-
-
-def wdqs_geosearch(lat, lon):
-    default_max_dist = 1
-    rows = wdqs_geosearch_query(lat, lon)
-    max_dist = {
-        "Q188509": 1,  # suburb
-        "Q3957": 2,  # town
-        "Q532": 1,  # village
-        "Q5084": 1,  # hamlet
-        "Q515": 2,  # city
-        "Q1549591": 3,  # big city
-    }
-    for row in rows:
-        isa = wd_uri_to_qid(row["isa"]["value"])
-
-        if (
-            "commonsCat" not in row
-            and "commonsSiteLink" not in row
-            and isa not in max_dist
-        ):
-            continue
-
-        distance = float(row["distance"]["value"])
-        if distance > max_dist.get(isa, default_max_dist):
-            continue
-
-        if "commonsCat" not in row and "commonsSiteLink" not in row:
-            break
-
-        return row
+    return wikidata.build_dict(hit, lat, lon)
 
 
 def lat_lon_to_wikidata(lat, lon):
-    scotland_code = get_scotland_code(lat, lon)
+    scotland_code = scotland.get_scotland_code(lat, lon)
 
     if scotland_code:
-        rows = lookup_scottish_parish_in_wikidata(scotland_code)
-        hit = commons_from_rows(rows)
+        rows = wikidata.lookup_scottish_parish_in_wikidata(scotland_code)
+        hit = wikidata.commons_from_rows(rows)
         elements = []
-        result = build_dict(hit, lat, lon)
+        result = wikidata.build_dict(hit, lat, lon)
 
         return {"elements": elements, "result": result}
 
-    elements = geocode.overpass.get_osm_elements(lat, lon)
+    elements = model.Polygon.coords_within(lat, lon)
     result = do_lookup(elements, lat, lon)
 
     # special case because the City of London is admin_level=6 in OSM
-    if result["wikidata"] == city_of_london_qid:
+    if result.get("wikidata") == city_of_london_qid:
         return {"elements": elements, "result": result}
 
-    admin_level = result["admin_level"]
+    admin_level = result.get("admin_level")
 
     if not admin_level or admin_level >= 7:
         return {"elements": elements, "result": result}
 
-    row = wdqs_geosearch(lat, lon)
+    row = wikidata.geosearch(lat, lon)
     if row:
-        hit = commons_from_rows([row])
+        hit = wikidata.commons_from_rows([row])
         elements = []
-        result = build_dict(hit, lat, lon)
+        result = wikidata.build_dict(hit, lat, lon)
 
     return {"elements": elements, "result": result}
 
 
-
-def lookup_scottish_parish_in_wikidata(code):
-    query = render_template("sparql/scottish_parish.sparql", code=code)
-    return geocode.wikidata.wdqs(query)
-
-
-def lookup_gss_in_wikidata(gss):
-    query = render_template("sparql/lookup_gss.sparql", gss=gss)
-    return geocode.wikidata.wdqs(query)
-
-
-def lookup_wikidata_by_name(name, lat, lon):
-    query = render_template(
-        "sparql/lookup_by_name.sparql", name=repr(name), lat=str(lat), lon=str(lon)
-    )
-    return geocode.wikidata.wdqs(query)
-
-
-def unescape_title(t):
-    return urllib.parse.unquote(t.replace("_", " "))
-
-
-def commons_from_rows(rows):
-    for row in rows:
-        if "commonsCat" in row:
-            qid = wd_to_qid(row["item"])
-            return {"wikidata": qid, "commons_cat": row["commonsCat"]["value"]}
-        if "commonsSiteLink" in row:
-            site_link = row["commonsSiteLink"]["value"]
-            qid = wd_to_qid(row["item"])
-            cat = unescape_title(site_link[len(commons_cat_start) :])
-            return {"wikidata": qid, "commons_cat": cat}
-
-
-def get_commons_cat_from_gss(gss):
-    return commons_from_rows(lookup_gss_in_wikidata(gss))
-
-
 def osm_lookup(elements, lat, lon):
-    elements.sort(key=lambda e: bounding_box_area(e))
-
     for e in elements:
-        if "tags" not in e:
-            continue
-        tags = e["tags"]
+        tags = e.tags
         admin_level_tag = tags.get("admin_level")
         admin_level = (
             int(admin_level_tag)
@@ -228,7 +81,7 @@ def osm_lookup(elements, lat, lon):
             continue
         if "wikidata" in tags:
             qid = tags["wikidata"]
-            commons = geocode.wikidata.qid_to_commons_category(qid)
+            commons = wikidata.qid_to_commons_category(qid)
             if commons:
                 return {
                     "wikidata": qid,
@@ -237,7 +90,7 @@ def osm_lookup(elements, lat, lon):
                 }
         gss = tags.get("ref:gss")
         if gss:
-            ret = get_commons_cat_from_gss(gss)
+            ret = wikidata.get_commons_cat_from_gss(gss)
             if ret:
                 ret["admin_level"] = admin_level
                 return ret
@@ -247,22 +100,22 @@ def osm_lookup(elements, lat, lon):
             continue
         if name.endswith(" CP"):
             name = name[:-3]
-        rows = lookup_wikidata_by_name(name, lat, lon)
+        rows = wikidata.lookup_wikidata_by_name(name, lat, lon)
 
         if len(rows) == 1:
-            ret = commons_from_rows(rows)
+            ret = wikidata.commons_from_rows(rows)
             if ret:
                 ret["admin_level"] = admin_level
                 return ret
 
-    has_wikidata_tag = [e["tags"] for e in elements if "wikidata" in e["tags"]]
+    has_wikidata_tag = [e.tags for e in elements if e.tags.get("wikidata")]
     if len(has_wikidata_tag) != 1:
         return
 
     qid = has_wikidata_tag[0]["wikidata"]
     return {
         "wikidata": qid,
-        "commons_cat": geocode.qid_to_commons_category(qid),
+        "commons_cat": wikidata.qid_to_commons_category(qid),
         "admin_level": admin_level,
     }
 
@@ -287,7 +140,7 @@ def index():
 def random_location():
     lat, lon = get_random_lat_lon()
 
-    elements = geocode.overpass.get_osm_elements(lat, lon)
+    elements = model.Polygon.coords_within(lat, lon)
     result = do_lookup(elements, lat, lon)
 
     return render_template(
@@ -300,15 +153,15 @@ def wikidata_tag():
     lat = float(request.args.get("lat"))
     lon = float(request.args.get("lon"))
 
-    scotland_code = get_scotland_code(lat, lon)
+    scotland_code = scotland.get_scotland_code(lat, lon)
 
     if scotland_code:
-        rows = lookup_scottish_parish_in_wikidata(scotland_code)
-        hit = commons_from_rows(rows)
+        rows = wikidata.lookup_scottish_parish_in_wikidata(scotland_code)
+        hit = wikidata.commons_from_rows(rows)
         elements = []
-        result = build_dict(hit, lat, lon)
+        result = wikidata.build_dict(hit, lat, lon)
     else:
-        elements = geocode.overpass.get_osm_elements(lat, lon)
+        elements = model.Polygon.coords_within(lat, lon)
         result = do_lookup(elements, lat, lon)
 
     return render_template(
@@ -322,7 +175,18 @@ def detail_page():
         lat, lon = [float(request.args.get(param)) for param in ("lat", "lon")]
     except TypeError:
         return redirect(url_for("index"))
-    reply = lat_lon_to_wikidata(lat, lon)
+    try:
+        reply = lat_lon_to_wikidata(lat, lon)
+    except wikidata.QueryError as e:
+        query, r = e.args
+        return render_template(
+            "query_error.html",
+            lat=lat,
+            lon=lon,
+            query=query,
+            r=r
+        )
+
     return render_template("detail.html", lat=lat, lon=lon, **reply)
 
 

templates/detail.html

@@ -32,7 +32,7 @@
 
 {% for element in elements %}
 {% set tags = element.tags %}
-  <pre>{{ element | pprint }}</pre>
+  <pre>{{ element.tags | pprint }}</pre>
 {% endfor %}
 
 

templates/query_error.html

@@ -0,0 +1,28 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <title>Geocode to commons</title>
+</head>
+
+<body>
+<h1>Geocode coordinates to Commons Category</h1>
+
+<p><a href="{{ url_for('index', lat=lat, lon=lon) }}">visit endpoint</a>
+
+| <a href="https://www.openstreetmap.org/#map=17/{{lat }}/{{ lon }}">view in OSM</a>
+
+| <a href="{{ url_for('detail_page', lat=lat, lon=lon) }}">#</a>
+
+</p>
+
+<h2>query</h2>
+
+<pre>{{ query }}</pre>
+
+<h2>reply</h2>
+
+<pre>{{ r.text }}</pre>
+
+</body>
+</html>

templates/sparql/geosearch.sparql

@@ -12,8 +12,9 @@ SELECT DISTINCT ?item ?distance ?itemLabel ?isa ?isaLabel ?commonsCat ?commonsSi
     }
   }
   MINUS { ?item wdt:P582 ?endTime . }
+  MINUS { ?item wdt:P31 wd:Q1497375 . }
   OPTIONAL { ?item wdt:P373 ?commonsCat. }
   OPTIONAL { ?commonsSiteLink schema:about ?item;
              schema:isPartOf <https://commons.wikimedia.org/>. }
   SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
-} ORDER BY (?distance)"""
+} ORDER BY (?distance)

templates/wikidata_tag.html

@@ -0,0 +1,51 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <title>Geocode to commons</title>
+<style>
+.text-end { text-align: right }
+</style>
+</head>
+
+<body>
+<h1>Geocode coordinates to Commons Category</h1>
+
+<p><a href="{{ url_for('index', lat=lat, lon=lon) }}">visit endpoint</a>
+
+| <a href="https://www.openstreetmap.org/#map=17/{{lat }}/{{ lon }}">view in OSM</a>
+
+{% if result.commons_cat %}
+| <a href="{{ result.commons_cat.url }}">Commons category</a>
+{% endif %}
+
+{% if result.wikidata %}
+  | <a href="https://www.wikidata.org/wiki/{{ result.wikidata }}">{{ result.wikidata }}</a>
+{% endif %}
+
+| <a href="{{ url_for('detail_page', lat=lat, lon=lon) }}">#</a>
+
+</p>
+
+<pre>{{ result | pprint }}</pre>
+
+{% if result.commons_cat %}
+<p>({{ lat }}, {{ lon }}, {{result.commons_cat.title | pprint }}),</p>
+{% endif %}
+
+<table>
+{% for e in elements %}
+{% set tags = e.tags %}
+<tr>
+  <td><a href="{{ e.osm_url }}">{{ tags.name }}</a></td>
+  <td>{{ tags.admin_level }}</td>
+  <td>{{ tags.boundary }}</td>
+  <td>{{ tags.designation }}</td>
+  <td class="text-end">{{ '{:,.0f}'.format(e.area_in_sq_km) }} km²</td>
+  <td>{{ 'wikidata' in tags }}</td>
+</tr>
+{% endfor %}
+</table>
+
+</body>
+</html>