\u69cb\u6210<\/h3>\n
DB\uff1aPostgreSQL\uff08RDB\uff09<\/li>\n
\u62e1\u5f35\uff1aPostGIS\uff08\u7a7a\u9593\u578b\u30fb\u7a7a\u9593\u95a2\u6570\u30fbGIST\/SP-GiST\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\uff09<\/li>\n
\u30a2\u30d7\u30ea\uff1aFlask\uff08API\uff09<\/li>\n
ORM\uff1aFlask-SQLAlchemy + GeoAlchemy2<\/li>\n <\/ul>\n <\/div>\n
\u3053\u306e\u624b\u9806\u306e\u30b4\u30fc\u30eb<\/h3>\n
places<\/code> \u306b\u7def\u5ea6\u7d4c\u5ea6\uff08POINT\uff09\u3092\u683c\u7d0d<\/li>\n
\u534a\u5f84\u25cbm\u4ee5\u5185\u306e\u8fd1\u508d\u691c\u7d22\u3092API\u3067\u8fd4\u3059<\/li>\n
hazard_areas<\/code>\uff08\u30dd\u30ea\u30b4\u30f3\uff09\u3092\u7528\u610f\u3057\u300c\u70b9\u304c\u30a8\u30ea\u30a2\u5185\u304b\u300d\u5224\u5b9a\u3059\u308b<\/li>\n          <\/ul>\n        <\/div>\n      <\/div>\n      \n        \u8ddd\u96e2\u3092\u300c\u30e1\u30fc\u30c8\u30eb\u300d\u3067\u6271\u3046\u305f\u3081\u3001POINT\u306f Geography\u578b<\/b>\uff08WGS84\/SRID4326\uff09\u3092\u63a1\u7528\u3002\n        \u30dd\u30ea\u30b4\u30f3\uff08\u30cf\u30b6\u30fc\u30c9\u7b49\uff09\u306f Geometry\u578b<\/b>\uff08SRID4326\uff09\u3067\u7ba1\u7406\u3057\u3001\u5224\u5b9a\u6642\u306b\u5fc5\u8981\u306a\u3089\u5730\u7406\uff08geography\uff09\u30ad\u30e3\u30b9\u30c8\u3067m\u8a08\u7b97\u3082\u3067\u304d\u307e\u3059\u3002\n      <\/p>\n    <\/div>\n\n    
1.1 PostGIS\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8\uff08\u4f8b\u3064\u304d\u30fbLeaflet\u3060\u3051\u3060\u3068\u30c0\u30e1\u306a\u7406\u7531\uff09<\/h2>\n    \n      \n        PostGIS\u306f\u300c\u5730\u56f3\u3092\u8868\u793a\u3059\u308b\u305f\u3081\u306e\u90e8\u54c1\u300d\u3058\u3083\u306a\u304f\u3001\u7a7a\u9593\u691c\u7d22\u3068\u5224\u5b9a\u3092\u201c\u6b63\u3057\u304f\u30fb\u901f\u304f\u30fb\u904b\u7528\u53ef\u80fd\u306b\u201d\u3059\u308bDB\u62e1\u5f35<\/b>\u3067\u3059\u3002\n        \u3064\u307e\u308a\u3001Leaflet\u304c\u3044\u304f\u3089\u512a\u79c0\u3067\u3082\u3001Leaflet\u3060\u3051\u3067\u7a7a\u9593\u30ed\u30b8\u30c3\u30af\u3092\u80cc\u8ca0\u308f\u305b\u308b\u3068\u7834\u7dbb<\/b>\u3057\u3084\u3059\u3044\u3002\n      <\/p>\n\n      
PostGIS\u306e\u30e1\u30ea\u30c3\u30c8\uff08\u5b9f\u52d9\u3067\u52b9\u304f\u9806\uff09<\/h3>\n      \n        \n          \u2460 \u8fd1\u508d\u691c\u7d22\u304c\u901f\u3044\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3067\u52dd\u3064\uff09<\/b>\n          \n            \u4f8b\uff1a\u300c\u73fe\u5728\u5730\u304b\u3089\u907f\u96e3\u6240\u3092\u534a\u5f84500m\u3067\u62bd\u51fa\u300d<\/b>\u3002\n            PostGIS\u306a\u3089 ST_DWithin<\/code> + GIST<\/b> \u3067\u5019\u88dc\u3060\u3051\u3092\u7d5e\u308a\u3001ST_Distance<\/code> \u3067\u8ddd\u96e2\u9806\u306b\u4e26\u3079\u3089\u308c\u307e\u3059\u3002\n            \u4ef6\u6570\u304c\u6570\u4e07\u301c\u6570\u767e\u4e07\u3067\u3082\u300cDB\u304c\u5f97\u610f\u306a\u65b9\u6cd5\u300d\u3067\u634c\u3051\u308b\u3002\n          <\/span>\n        <\/li>\n        
\n          \u2461 \u201c\u70b9\u304c\u30dd\u30ea\u30b4\u30f3\u5185\u304b\u201d \u3092DB\u3067\u6b63\u78ba\u306b\u5224\u5b9a\u3067\u304d\u308b<\/b>\n          \n            \u4f8b\uff1a\u300c\u64ae\u5f71\u5730\u70b9\u304c\u6d78\u6c34\u60f3\u5b9a\u533a\u57df\uff08\u30dd\u30ea\u30b4\u30f3\uff09\u306b\u5165\u3063\u3066\u308b\uff1f\u300d<\/b>\u3002\n            PostGIS\u306a\u3089 ST_Contains<\/code>\/ST_Within<\/code> \u3067\u4e00\u767a\u3002\n            \uff08\u30d6\u30e9\u30a6\u30b6\u5074\u3067\u3084\u308b\u3068\u3001\u30c7\u30fc\u30bf\u8ee2\u9001\u30fb\u7cbe\u5ea6\u30fb\u66f4\u65b0\u30fb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3067\u75db\u3044\u76ee\u3092\u898b\u304c\u3061\uff09\n          <\/span>\n        <\/li>\n        
\n          \u2462 \u201c\u30e1\u30fc\u30c8\u30eb\u201d\u306e\u4e16\u754c\u3067\u8ddd\u96e2\u3084\u534a\u5f84\u304c\u6271\u3048\u308b\uff08\u4e8b\u6545\u308a\u306b\u304f\u3044\uff09<\/b>\n          \n            \u4f8b\uff1a\u300c\u534a\u5f84R=30m\u306b\u5165\u3063\u305f\u3089POI\u4fb5\u5165\u300d<\/b>\u3002\n            Geography\u306a\u3089\u8ddd\u96e2\u306fm\u3067\u63c3\u3046\u3002geometry\u306e\u307e\u307e\u5ea6\u3067\u8a08\u7b97\u3057\u3066\u300c\u306a\u3093\u304b\u30ba\u30ec\u308b\u300d\u4e8b\u6545\u304c\u6e1b\u308a\u307e\u3059\u3002\n          <\/span>\n        <\/li>\n        
\n          \u2463 DB\u306eJOIN\/\u96c6\u8a08\u3068\u7a7a\u9593\u30ed\u30b8\u30c3\u30af\u3092\u5408\u4f53\u3067\u304d\u308b<\/b>\n          \n            \u4f8b\uff1a\u300c\u904e\u53bb24\u6642\u9593\u306e\u30a2\u30e9\u30fc\u30c8\u4ef6\u6570\u304c\u591a\u3044\u30a8\u30ea\u30a2\u3060\u3051\u62bd\u51fa\u300d<\/b>\uff0b\u300c\u305d\u306e\u4e2d\u3067\u30cf\u30b6\u30fc\u30c9\u6fc3\u5ea6\u304c\u6fc3\u3044\u300d<\/b>\u3092\u540c\u6642\u306b\u3084\u308b\u3002\n            \u3053\u308c\u3001\u30d5\u30ed\u30f3\u30c8\u3060\u3051\u3060\u3068\u307e\u305a\u7121\u7406\uff08\u30c7\u30fc\u30bf\u304c\u91cd\u3059\u304e\u3001\u51e6\u7406\u304c\u8907\u96d1\u3001\u518d\u73fe\u6027\u304c\u6b7b\u306c\uff09\u3002\n          <\/span>\n        <\/li>\n        
\n          \u2464 GeoJSON\u51fa\u529b\u3084\u5909\u63db\u304c\u697d\uff08API\u304c\u8584\u304f\u306a\u308b\uff09<\/b>\n          \n            ST_AsGeoJSON<\/code> \u7b49\u3067DB\u2192JSON\u304c\u76f4\u7d50\u3002Flask\u306f\u201c\u914d\u9054\u54e1\u201d\u306b\u5fb9\u3057\u3066\u3088\u304f\u306a\u308a\u307e\u3059\u3002\n          <\/span>\n        <\/li>\n      <\/ul>\n\n      <\/div>\n\n      Leaflet\u300c\u3060\u3051\u300d\u3060\u3068\u306a\u305c\u30c0\u30e1\u304b\uff08\u523a\u3055\u308b\u73fe\u5b9f\uff09<\/h3>\n      \n        \n          \u30c7\u30fc\u30bf\u304c\u5897\u3048\u305f\u77ac\u9593\u306b\u7d42\u308f\u308b<\/b>\n          \n            Leaflet\u3067\u8fd1\u508d\u691c\u7d22\u3092\u3084\u308b\uff1d\u5019\u88dc\u30c7\u30fc\u30bf\u3092\u30d6\u30e9\u30a6\u30b6\u3078\u5927\u91cf\u306b\u9001\u308b or \u9010\u6b21\u53d6\u5f97\u3057\u3066\u7dcf\u5f53\u305f\u308a\u3002\n            \u6570\u4e07\u4ef6\u3092\u8d85\u3048\u308b\u3068\u56de\u7dda\u30fb\u30e1\u30e2\u30ea\u30fbCPU\u3067\u8a70\u307f\u307e\u3059\u3002\u30b9\u30de\u30db\u306a\u3089\u5373\u6b7b\u3002\n          <\/span>\n        <\/li>\n        
\n          \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\/\u6a29\u9650\u304c\u5d29\u58ca\u3057\u3084\u3059\u3044<\/b>\n          \n            \u30dd\u30ea\u30b4\u30f3\uff08\u30cf\u30b6\u30fc\u30c9\u3001\u91cd\u8981\u65bd\u8a2d\u3001\u5951\u7d04\u60c5\u5831\u4ed8\u304dPOI\u306a\u3069\uff09\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u914d\u308b\u6642\u70b9\u3067\u6f0f\u308c\u307e\u3059\u3002\n            \u300c\u898b\u305b\u3066\u3044\u3044\u7bc4\u56f2\u3060\u3051DB\u3067\u7d5e\u308b\u300d\u304c\u57fa\u672c\u3002Leaflet\u306f\u8868\u793a\u4fc2\u3002\n          <\/span>\n        <\/li>\n        
\n          \u201c\u6b63\u3057\u3055\u201d\u306e\u62c5\u4fdd\u304c\u96e3\u3057\u3044<\/b>\n          \n            \u30dd\u30ea\u30b4\u30f3\u306e\u81ea\u5df1\u4ea4\u5dee\u3001\u4e0d\u6b63\u30b8\u30aa\u30e1\u30c8\u30ea\u3001SRID\u6df7\u5728\u3001\u5883\u754c\u306e\u6271\u3044\u2026\u3053\u3046\u3044\u3046\u5730\u96f7\u3092\u30d5\u30ed\u30f3\u30c8\u3067\u62b1\u3048\u308b\u306e\u306f\u7f70\u30b2\u30fc\u30e0\u3002\n            PostGIS\u306a\u3089 ST_IsValid<\/code> \u3084\u5236\u7d04\u3001\u7d71\u4e00SRID\u3067\u6574\u5408\u6027\u3092\u5b88\u308c\u307e\u3059\u3002\n          <\/span>\n        <\/li>\n        
\n          \u904b\u7528\uff08\u66f4\u65b0\u30fb\u518d\u8a08\u7b97\u30fb\u76e3\u67fb\u30fb\u518d\u73fe\u6027\uff09\u304c\u6b7b\u306c<\/b>\n          \n            \u300c\u3044\u3064\u306e\u30c7\u30fc\u30bf\u3067\u5224\u5b9a\u3057\u305f\uff1f\u300d\u3092\u30b5\u30fc\u30d0\u5074\u3067\u8ffd\u8de1\u3067\u304d\u306a\u3044\u69cb\u6210\u306f\u3001\u5f8c\u304b\u3089\u63c9\u3081\u307e\u3059\u3002\n            DB\u3067\u51e6\u7406\u3057\u3066\u7d50\u679c\u3068\u6761\u4ef6\u3092\u30ed\u30b0\u306b\u6b8b\u3059\u306e\u304c\u73fe\u5b9f\u7684\u3002\n          <\/span>\n        <\/li>\n      <\/ul>\n\n      \n        \u307e\u3068\u3081\uff1aLeaflet\u306f\u8868\u793a\u3068UI<\/b>\u304c\u5f37\u3044\u3002PostGIS\u306f\u691c\u7d22\u3068\u5224\u5b9a<\/b>\u304c\u5f37\u3044\u3002\u5f79\u5272\u5206\u62c5\u3057\u306a\u3044\u3068\u3001\u3060\u3044\u305f\u3044\u71c3\u3048\u307e\u3059\u3002\n      <\/p>\n    <\/div>\n\n    
2. Ubuntu\uff1aPostgreSQL + PostGIS \u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/h2>\n    \n      Ubuntu<\/span> PostgreSQL\u672c\u4f53\uff1a<\/p>\n      
sudo apt update\nsudo apt install -y postgresql postgresql-contrib<\/code><\/pre>\n\n      PostGIS\uff1a<\/p>\n      
# \u3060\u3044\u305f\u3044\u3053\u308c\u3067\u5165\u308b\nsudo apt install -y postgis\n\n# extension \u304c\u898b\u3064\u304b\u3089\u306a\u3044\/\u5165\u3089\u306a\u3044\u5834\u5408\u306f\u3001PG\u30e1\u30b8\u30e3\u30fc\u306b\u5408\u308f\u305b\u3066\u5165\u308c\u308b\nPG_MAJOR=$(psql -V | awk '{print $3}' | cut -d. -f1)\nsudo apt install -y \"postgresql-$PG_MAJOR-postgis-3\" \"postgresql-$PG_MAJOR-postgis-3-scripts\"<\/code><\/pre>\n\n      \u30b5\u30fc\u30d3\u30b9\u78ba\u8a8d\uff1a<\/p>\n      
sudo systemctl enable --now postgresql\nsudo systemctl status postgresql<\/code><\/pre>\n\n      \n        \u5916\u90e8\uff08\u5225PC\uff09\u304b\u3089\u63a5\u7d9a\u3059\u308b\u306a\u3089\u3001postgresql.conf<\/code>\uff08listen_addresses\uff09\u3068 pg_hba.conf<\/code> \u3092\u8a2d\u5b9a\u3057\u3001FW\u3082\u958b\u3051\u307e\u3059\u3002\n        \u305f\u3060\u3057\u6700\u521d\u306f \u30b5\u30fc\u30d0\u5185\u3067psql\u3092\u53e9\u304f<\/b> \u306e\u304c\u4e00\u756a\u65e9\u3044\uff08\u5207\u308a\u5206\u3051\u304c\u697d\uff09\u3002\n      <\/p>\n    <\/div>\n\n    
3. DB\u4f5c\u6210\uff08\u30e6\u30fc\u30b6\u30fc\u30fbDB\u30fb\u62e1\u5f35\u30fb\u63a8\u5968\u8a2d\u5b9a\uff09<\/h2>\n    \n      \u307e\u305apostgres\u3067psql\u3078\uff1a<\/p>\n      
sudo -u postgres psql<\/code><\/pre>\n\n      \u30a2\u30d7\u30ea\u7528\u30e6\u30fc\u30b6\u30fc\u3068DB\uff1a<\/p>\n      
CREATE USER appuser WITH PASSWORD 'apppass';\nCREATE DATABASE appdb OWNER appuser;\n\n\\c appdb\nCREATE EXTENSION IF NOT EXISTS postgis;\n\nSELECT PostGIS_Version();<\/code><\/pre>\n\n      \u30d1\u30b9\u30ef\u30fc\u30c9\u306f\u4f8b\u3067\u3059\u3002\u5b9f\u904b\u7528\u3067\u306f\u5f37\u3044\u3082\u306e\u306b\u5909\u66f4\u3002<\/p>\n\n      
<\/div>\n      \uff08\u4efb\u610f\uff09\u65e5\u672c\u8a9e\u30bd\u30fc\u30c8\u3084\u5168\u6587\u691c\u7d22\u3082\u3084\u308b\u306a\u3089<\/h3>\n      -- \u65e5\u672c\u8a9e\u7167\u5408\u304c\u5fc5\u8981\u306a\u3089DB\u4f5c\u6210\u6642\u306blocale\u3092\u9078\u3076\uff08\u5f8c\u304b\u3089\u5909\u66f4\u3057\u306b\u304f\u3044\uff09\n-- \u3053\u3053\u3067\u306f\u5272\u611b\u3002\u5fc5\u8981\u306a\u3089\u8981\u4ef6\u6b21\u7b2c\u3067\u6c7a\u3081\u308b\u3002<\/code><\/pre>\n    <\/div>\n\n    4. Python\u74b0\u5883\uff08venv\uff09\u3068\u4f9d\u5b58\u5c0e\u5165<\/h2>\n    \n      \u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u4f5c\u6210\uff08Ubuntu\u30b5\u30fc\u30d0\u5185\uff09\uff1a<\/p>\n      
mkdir -p \/opt\/pg_flask_demo\ncd \/opt\/pg_flask_demo\n\npython3 -m venv .venv\nsource .venv\/bin\/activate\n\npip install --upgrade pip<\/code><\/pre>\n\n      \u4f9d\u5b58\uff08\u3053\u306e\u69cb\u6210\u3067\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u904b\u7528\u304c\u5b89\u5b9a\uff09\uff1a<\/p>\n      
pip install flask flask-sqlalchemy flask-migrate psycopg2-binary geoalchemy2 python-dotenv<\/code><\/pre>\n\n      \n        \u672c\u756a\u3067\u3088\u308a\u5805\u304f\u3059\u308b\u306a\u3089\u3001psycopg2<\/code> \u3092\u30bd\u30fc\u30b9\u30d3\u30eb\u30c9\uff08libpq\uff09\u306b\u3059\u308b\/ psycopg<\/code> \u3078\u79fb\u884c\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u307e\u305a\u306f\u52d5\u304b\u3059\u306e\u304c\u5148\u3002\n      <\/p>\n    <\/div>\n\n    
5. Flask\u30b5\u30f3\u30d7\u30eb\uff08Flask-SQLAlchemy + GeoAlchemy2\uff09<\/h2>\n    \n      \u30d5\u30a1\u30a4\u30eb\u69cb\u6210<\/b><\/p>\n      
\/opt\/pg_flask_demo\/\n  app.py\n  .env\n  migrations\/   \uff08\u5f8c\u3067\u4f5c\u3089\u308c\u308b\uff09\n<\/code><\/pre>\n\n      .env<\/b>\uff08\u63a5\u7d9a\u6587\u5b57\u5217\uff09<\/p>\n      
DATABASE_URL=postgresql+psycopg2:\/\/appuser:apppass@127.0.0.1:5432\/appdb\nFLASK_ENV=development\n<\/code><\/pre>\n\n      app.py<\/b>\uff08\u30b3\u30d4\u30da\u3067\u52d5\u304f\u3002\u7a7a\u9593\u691c\u7d22\u3082\u5165\u3063\u3066\u307e\u3059\uff09<\/p>\n      
from __future__ import annotations\n\nimport os\nfrom typing import Any, Dict, List, Optional\n\nfrom dotenv import load_dotenv\nfrom flask import Flask, jsonify, request\nfrom flask_migrate import Migrate\nfrom flask_sqlalchemy import SQLAlchemy\nfrom geoalchemy2 import Geography, Geometry\nfrom sqlalchemy import Index, cast, func\n\nload_dotenv()\n\ndb = SQLAlchemy()\nmigrate = Migrate()\n\n# ---- Models ----\n\nclass Place(db.Model):\n    __tablename__ = \"places\"\n    id = db.Column(db.Integer, primary_key=True)\n    name = db.Column(db.String(200), nullable=False)\n\n    # \u8ddd\u96e2\u3092m\u3067\u6271\u3046\u305f\u3081Geography(POINT)\n    # SRID\u306fGPS\u306eWGS84\u30674326\u56fa\u5b9a\n    location = db.Column(Geography(geometry_type=\"POINT\", srid=4326), nullable=False)\n\nIndex(\"ix_places_location_gist\", Place.location, postgresql_using=\"gist\")\n\n\nclass HazardArea(db.Model):\n    \"\"\"\n    \u30cf\u30b6\u30fc\u30c9\u4f8b\uff08\u6d78\u6c34\/\u571f\u7802\/\u6d25\u6ce2\u306a\u3069\uff09\u3092\u60f3\u5b9a\uff1a\u30dd\u30ea\u30b4\u30f3(MULTIPOLYGON)\n    SRID=4326\u306eGeometry\u3067\u4fdd\u6301\uff08\u5224\u5b9a\u306fST_Contains\u7b49\uff09\u3002\n    \"\"\"\n    __tablename__ = \"hazard_areas\"\n    id = db.Column(db.Integer, primary_key=True)\n    name = db.Column(db.String(200), nullable=False)\n    kind = db.Column(db.String(50), nullable=False)  # flood\/landslide\/tsunami etc\n    geom = db.Column(Geometry(geometry_type=\"MULTIPOLYGON\", srid=4326), nullable=False)\n\nIndex(\"ix_hazard_areas_geom_gist\", HazardArea.geom, postgresql_using=\"gist\")\n\n\n# ---- App Factory ----\n\ndef create_app() -> Flask:\n    app = Flask(__name__)\n    db_url = os.environ.get(\"DATABASE_URL\")\n    if not db_url:\n        raise RuntimeError(\"DATABASE_URL is not set. Put it in .env\")\n\n    app.config[\"SQLALCHEMY_DATABASE_URI\"] = db_url\n    app.config[\"SQLALCHEMY_TRACK_MODIFICATIONS\"] = False\n\n    db.init_app(app)\n    migrate.init_app(app, db)\n\n    # ---- Routes ----\n\n    @app.get(\"\/health\")\n    def health():\n        return {\"ok\": True}\n\n    @app.post(\"\/api\/places\")\n    def create_place():\n        \"\"\"\n        body: { \"name\": \"...\", \"lat\": 35.6, \"lon\": 139.7 }\n        \"\"\"\n        data: Dict[str, Any] = request.get_json(force=True)\n        name = str(data.get(\"name\", \"\")).strip()\n        lat = data.get(\"lat\")\n        lon = data.get(\"lon\")\n\n        if not name:\n            return jsonify({\"error\": \"name is required\"}), 400\n        if lat is None or lon is None:\n            return jsonify({\"error\": \"lat\/lon are required\"}), 400\n\n        # WKT: POINT(lon lat)  \u203b\u9806\u5e8f\u306flon\u304c\u5148\n        wkt = f\"SRID=4326;POINT({float(lon)} {float(lat)})\"\n\n        p = Place(name=name, location=wkt)\n        db.session.add(p)\n        db.session.commit()\n\n        return jsonify({\"id\": p.id, \"name\": p.name, \"lat\": float(lat), \"lon\": float(lon)}), 201\n\n    @app.get(\"\/api\/places\")\n    def list_places():\n        \"\"\"\n        GET \/api\/places?limit=50\n        \"\"\"\n        limit = int(request.args.get(\"limit\", \"50\"))\n        limit = max(1, min(limit, 500))\n\n        # Geography\u304b\u3089lon\/lat\u3092\u53d6\u308a\u51fa\u3059\u306b\u306f geometry \u306b\u30ad\u30e3\u30b9\u30c8\u3057\u3066ST_X\/ST_Y\n        geom_point = cast(Place.location, Geometry(geometry_type=\"POINT\", srid=4326))\n\n        rows = (\n            db.session.query(\n                Place.id,\n                Place.name,\n                func.ST_Y(geom_point).label(\"lat\"),\n                func.ST_X(geom_point).label(\"lon\"),\n            )\n            .order_by(Place.id.desc())\n            .limit(limit)\n            .all()\n        )\n\n        out = [{\"id\": r.id, \"name\": r.name, \"lat\": float(r.lat), \"lon\": float(r.lon)} for r in rows]\n        return jsonify(out)\n\n    @app.get(\"\/api\/nearby\")\n    def nearby():\n        \"\"\"\n        \/api\/nearby?lat=35.681&lon=139.767&r=300\n        r: meters\n        \"\"\"\n        lat = request.args.get(\"lat\")\n        lon = request.args.get(\"lon\")\n        r = request.args.get(\"r\", \"300\")\n\n        if lat is None or lon is None:\n            return jsonify({\"error\": \"lat\/lon are required\"}), 400\n\n        lat_f = float(lat)\n        lon_f = float(lon)\n        r_m = float(r)\n\n        # \u5bfe\u8c61\u70b9\uff08geography\uff09\n        point_geog = func.ST_GeogFromText(f\"SRID=4326;POINT({lon_f} {lat_f})\")\n        geom_point = cast(Place.location, Geometry(geometry_type=\"POINT\", srid=4326))\n\n        rows = (\n            db.session.query(\n                Place.id,\n                Place.name,\n                func.ST_Y(geom_point).label(\"lat\"),\n                func.ST_X(geom_point).label(\"lon\"),\n                func.ST_Distance(Place.location, point_geog).label(\"distance_m\"),\n            )\n            .filter(func.ST_DWithin(Place.location, point_geog, r_m))\n            .order_by(func.ST_Distance(Place.location, point_geog))\n            .limit(200)\n            .all()\n        )\n\n        out = [\n            {\"id\": r.id, \"name\": r.name, \"lat\": float(r.lat), \"lon\": float(r.lon), \"distance_m\": float(r.distance_m)}\n            for r in rows\n        ]\n        return jsonify(out)\n\n    @app.get(\"\/api\/places\/bbox\")\n    def places_bbox():\n        \"\"\"\n        \/api\/places\/bbox?minlat=...&minlon=...&maxlat=...&maxlon=...\n        \u5730\u56f3\u306e\u8868\u793a\u7bc4\u56f2\uff08BBox\uff09\u5185\u306e\u70b9\u3060\u3051\u8fd4\u3059\uff08\u30d5\u30ed\u30f3\u30c8\u306e\u5730\u56f3\u79fb\u52d5\u3067\u5b9a\u756a\uff09\n        \"\"\"\n        minlat = request.args.get(\"minlat\")\n        minlon = request.args.get(\"minlon\")\n        maxlat = request.args.get(\"maxlat\")\n        maxlon = request.args.get(\"maxlon\")\n\n        if None in (minlat, minlon, maxlat, maxlon):\n            return jsonify({\"error\": \"minlat\/minlon\/maxlat\/maxlon are required\"}), 400\n\n        minlat_f, minlon_f = float(minlat), float(minlon)\n        maxlat_f, maxlon_f = float(maxlat), float(maxlon)\n\n        env = func.ST_MakeEnvelope(minlon_f, minlat_f, maxlon_f, maxlat_f, 4326)\n        geom_point = cast(Place.location, Geometry(geometry_type=\"POINT\", srid=4326))\n\n        rows = (\n            db.session.query(\n                Place.id,\n                Place.name,\n                func.ST_Y(geom_point).label(\"lat\"),\n                func.ST_X(geom_point).label(\"lon\"),\n            )\n            .filter(func.ST_Intersects(geom_point, env))\n            .order_by(Place.id.desc())\n            .limit(2000)\n            .all()\n        )\n\n        out = [{\"id\": r.id, \"name\": r.name, \"lat\": float(r.lat), \"lon\": float(r.lon)} for r in rows]\n        return jsonify(out)\n\n    @app.get(\"\/api\/hazards\/check\")\n    def hazards_check():\n        \"\"\"\n        \/api\/hazards\/check?lat=...&lon=...&kind=flood\n        \u70b9\u304c\u30cf\u30b6\u30fc\u30c9\u30dd\u30ea\u30b4\u30f3\u5185\u306b\u5165\u3063\u3066\u3044\u308b\u304b\u3092\u8fd4\u3059\n        \"\"\"\n        lat = request.args.get(\"lat\")\n        lon = request.args.get(\"lon\")\n        kind = request.args.get(\"kind\")  # \u4efb\u610f\n\n        if lat is None or lon is None:\n            return jsonify({\"error\": \"lat\/lon are required\"}), 400\n\n        lat_f, lon_f = float(lat), float(lon)\n        point = func.ST_SetSRID(func.ST_MakePoint(lon_f, lat_f), 4326)\n\n        q = db.session.query(HazardArea.id, HazardArea.name, HazardArea.kind).filter(\n            func.ST_Contains(HazardArea.geom, point)\n        )\n        if kind:\n            q = q.filter(HazardArea.kind == kind)\n\n        rows = q.order_by(HazardArea.id.desc()).limit(200).all()\n        out = [{\"id\": r.id, \"name\": r.name, \"kind\": r.kind} for r in rows]\n        return jsonify(out)\n\n    return app\n\n\napp = create_app()\n\nif __name__ == \"__main__\":\n    # \u958b\u767a\u7528\u9014\u3002\u904b\u7528\u306fgunicorn\u7b49\u3078\u3002\n    app.run(host=\"127.0.0.1\", port=5000, debug=True)<\/code><\/pre>\n    <\/div>\n\n    6. \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\uff08Flask-Migrate\uff09<\/h2>\n    \n      \u3053\u306e\u69cb\u6210\uff08Flask-SQLAlchemy\uff09\u306a\u3089\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u7d20\u76f4\u306b\u56de\u308a\u307e\u3059\u3002<\/p>\n      
cd \/opt\/pg_flask_demo\nsource .venv\/bin\/activate\n\n# \u521d\u671f\u5316\uff08migrations\/ \u304c\u4f5c\u3089\u308c\u308b\uff09\nflask --app app.py db init\n\n# \u5dee\u5206\u4f5c\u6210\nflask --app app.py db migrate -m \"create places and hazard_areas\"\n\n# \u53cd\u6620\nflask --app app.py db upgrade<\/code><\/pre>\n\n      \n        DB\u5074\u3067 CREATE EXTENSION postgis;<\/code> \u3092\u5fd8\u308c\u3066\u3044\u308b\u3068\u3001\u7a7a\u9593\u578b\u304c\u4f5c\u308c\u305a\u306b\u8a70\u307f\u307e\u3059\u3002\u5148\u306b\u6709\u52b9\u5316\u3057\u3066\u304b\u3089migrate\u3002\n      <\/p>\n    <\/div>\n\n    
7. API\u52d5\u4f5c\u78ba\u8a8d\uff08\u767b\u9332\u30fb\u4e00\u89a7\u30fb\u8fd1\u508d\u30fb\u7bc4\u56f2\u30fb\u30cf\u30b6\u30fc\u30c9\u5185\u5305\uff09<\/h2>\n    \n      \u8d77\u52d5\uff1a<\/p>\n      
cd \/opt\/pg_flask_demo\nsource .venv\/bin\/activate\npython app.py<\/code><\/pre>\n\n      7.1 places\u767b\u9332<\/h3>\n      curl -X POST \"http:\/\/127.0.0.1:5000\/api\/places\" \\\n  -H \"Content-Type: application\/json\" \\\n  -d '{\"name\":\"Tokyo\",\"lat\":35.681236,\"lon\":139.767125}'<\/code><\/pre>\n\n      7.2 places\u4e00\u89a7<\/h3>\n      curl \"http:\/\/127.0.0.1:5000\/api\/places?limit=50\"<\/code><\/pre>\n\n      7.3 \u8fd1\u508d\u691c\u7d22\uff08\u534a\u5f84300m\uff09<\/h3>\n      curl \"http:\/\/127.0.0.1:5000\/api\/nearby?lat=35.681236&lon=139.767125&r=300\"<\/code><\/pre>\n\n      7.4 \u8868\u793a\u7bc4\u56f2\uff08BBox\uff09\u3067\u70b9\u3092\u53d6\u308b<\/h3>\n      curl \"http:\/\/127.0.0.1:5000\/api\/places\/bbox?minlat=35.67&minlon=139.75&maxlat=35.70&maxlon=139.78\"<\/code><\/pre>\n\n      <\/div>\n\n      7.5 \u30cf\u30b6\u30fc\u30c9\u30dd\u30ea\u30b4\u30f3\u30921\u4ef6\u5165\u308c\u3066\u5185\u5305\u5224\u5b9a\uff08\u30b5\u30f3\u30d7\u30eb\uff09<\/h3>\n      \n        \u3053\u3053\u306fSQL\u3067\u5165\u308c\u308b\u306e\u304c\u6700\u901f\u3067\u3059\uff08\u30dd\u30ea\u30b4\u30f3\u306e\u4f8b\u306f\u300c\u56db\u89d2\u5f62\u300d\u3002\u5b9f\u30c7\u30fc\u30bf\u306f\u884c\u653f\u306eGeoJSON\u7b49\u3092\u53d6\u8fbc\uff09\u3002\n        \u6ce8\u610f\uff1a<\/b> MULTIPOLYGON \u3092\u671f\u5f85\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u4f8b\u3067\u306f\u5358\u4e00POLYGON\u3092MULTIPOLYGON\u306b\u5909\u63db\u3057\u307e\u3059\u3002\n      <\/p>\n      
# \u5225\u30bf\u30fc\u30df\u30ca\u30eb\u3067DB\u3078\nsudo -u postgres psql appdb\n\n-- \u30c6\u30b9\u30c8\u7528\uff1a\u6771\u4eac\u99c5\u4ed8\u8fd1\u3092\u96d1\u306b\u56f2\u3046\u201c\u30c6\u30b9\u30c8\u6d78\u6c34\u201d\u30dd\u30ea\u30b4\u30f3\uff08\u56db\u89d2\uff09\nINSERT INTO hazard_areas (name, kind, geom)\nVALUES (\n  '\u30c6\u30b9\u30c8\u6d78\u6c34\u30a8\u30ea\u30a2',\n  'flood',\n  ST_Multi(\n    ST_GeomFromText(\n      'SRID=4326;POLYGON((139.760 35.678, 139.775 35.678, 139.775 35.686, 139.760 35.686, 139.760 35.678))'\n    )\n  )\n);\n\n-- \u5224\u5b9a\uff08\u6771\u4eac\u99c5\u70b9\u304c\u5165\u3063\u3066\u3044\u308b\u304b\uff09\n-- API\u5074\u3067\u3084\u308b\u306e\u3067\u3053\u3053\u306f\u78ba\u8a8d\u7528\nSELECT id, name, ST_Contains(geom, ST_SetSRID(ST_MakePoint(139.767125,35.681236),4326)) AS inside\nFROM hazard_areas;<\/code><\/pre>\n\n      API\u3067\u5224\u5b9a\uff1a<\/p>\n      
curl \"http:\/\/127.0.0.1:5000\/api\/hazards\/check?lat=35.681236&lon=139.767125&kind=flood\"<\/code><\/pre>\n\n      JSON\u304c\u8fd4\u308c\u3070\u52dd\u3061\u3002<\/p>\n    <\/div>\n\n    
8. API \u21d4 PostGIS\u95a2\u6570 \u5bfe\u5fdc\u8868<\/h2>\n    \n      \n        \u300c\u3069\u306eAPI\u304c\u3069\u306ePostGIS\u95a2\u6570\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u304b\u300d\u3092\u56fa\u5b9a\u3067\u628a\u63e1\u3067\u304d\u308b\u8868\u3002\n        \u3053\u308c\u304c\u7121\u3044\u3068\u3001\u5f8c\u3067\u8ab0\u304b\u304c \u201c\u306a\u3093\u3068\u306a\u304fSQL\u201d \u3092\u3044\u3058\u3063\u3066\u5730\u96f7\u3092\u8e0f\u307f\u307e\u3059\u3002\n      <\/p>\n\n      \n        \n          \n            \n          \n            \n            \n            \n            \n            API<\/th>\n            \u7528\u9014<\/th>\n            \u4e3b\u306b\u4f7f\u3046PostGIS\u95a2\u6570<\/th>\n            \u578b\/\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/th>\n            \u6ce8\u610f\u70b9\uff08\u843d\u3068\u3057\u7a74\uff09<\/th>\n          <\/tr>\n        <\/thead>\n        
POST \/api\/places<\/code><\/td>\n            \u70b9\uff08\u7def\u5ea6\u7d4c\u5ea6\uff09\u3092\u767b\u9332<\/td>\n            \uff08\u4fdd\u5b58\u6642\uff09ST_GeogFromText<\/code> \u76f8\u5f53\uff08WKT\u3067\u683c\u7d0d\uff09<\/td>\n            Geography(POINT)<\/b>GIST\u63a8\u5968<\/td>\n            POINT\u306flon\u2192lat\u9806<\/b>\u3002\u3053\u3053\u9593\u9055\u3048\u308b\u3068\u5168\u90e8\u30ba\u30ec\u308b\u3002<\/td>\n          <\/tr>\n          
GET \/api\/places<\/code><\/td>\n            \u70b9\u4e00\u89a7\uff08lat\/lon\u8868\u793a\uff09<\/td>\n            ST_X<\/code>, ST_Y<\/code>\uff08\u203b geography\u2192geometry\u3078\u30ad\u30e3\u30b9\u30c8\uff09<\/td>\n            Geography\u2192Geometry\u30ad\u30e3\u30b9\u30c8<\/td>\n            ST_X\/ST_Y<\/code> \u306f geometry\u5411\u3051\u3002cast<\/b>\u5fc5\u9808\u3002<\/td>\n          <\/tr>\n          
GET \/api\/nearby<\/code><\/td>\n            \u8fd1\u508d\u691c\u7d22\uff08\u534a\u5f84m\uff09\uff0b\u8ddd\u96e2\u9806<\/td>\n            ST_DWithin<\/code>, ST_Distance<\/code>, ST_GeogFromText<\/code><\/td>\n            Geography<\/b> + GIST<\/b><\/td>\n            \n              GIST\u7121\u3057\uff1d\u9045\u3044<\/b>\u3002\n              \u8ddd\u96e2\u5358\u4f4d\u306fm\uff08Geography\uff09\u3002geometry\u306b\u3059\u308b\u3068\u5ea6\u3067\u4e8b\u6545\u308a\u3084\u3059\u3044\u3002\n            <\/td>\n          <\/tr>\n          
GET \/api\/places\/bbox<\/code><\/td>\n            \u8868\u793a\u7bc4\u56f2\u5185\uff08BBox\uff09\u3060\u3051\u8fd4\u3059<\/td>\n            ST_MakeEnvelope<\/code>, ST_Intersects<\/code><\/td>\n            Point\u3092geometry\u30ad\u30e3\u30b9\u30c8GIST\u63a8\u5968<\/td>\n            Leaflet\u306e\u5730\u56f3\u79fb\u52d5\u306b\u5408\u308f\u305b\u3066\u547c\u3076\u5b9a\u756a\u3002\u8fd4\u3059\u4ef6\u6570\u306f\u5fc5\u305a\u5236\u9650\u3002<\/td>\n          <\/tr>\n          
GET \/api\/hazards\/check<\/code><\/td>\n            \u70b9\u304c\u30cf\u30b6\u30fc\u30c9\u30dd\u30ea\u30b4\u30f3\u5185\u304b<\/td>\n            ST_Contains<\/code>, ST_MakePoint<\/code>, ST_SetSRID<\/code><\/td>\n            Geometry(MULTIPOLYGON)<\/b> + GIST<\/b><\/td>\n            \n              \u30dd\u30ea\u30b4\u30f3\u304c\u4e0d\u6b63\u5f62\u72b6\u3060\u3068\u5224\u5b9a\u304c\u58ca\u308c\u308b\u3002\n              \u53d6\u8fbc\u6642\u306b ST_IsValid<\/code> \/ ST_MakeValid<\/code> \u3092\u691c\u8a0e\u3002\n            <\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n\n      <\/div>\n\n      \uff08\u8ffd\u52a0\u3067\u3088\u304f\u4f7f\u3046\uff09API\u5019\u88dc\u3068\u95a2\u6570<\/h3>\n      \n        \n          \n          \n            \n            \n            \n            \u7528\u9014<\/th> \u95a2\u6570<\/th> \u4f55\u304c\u5b09\u3057\u3044\u304b<\/th><\/tr>\n        <\/thead>\n        
\u300c\u534a\u5f84R\u306e\u30d0\u30c3\u30d5\u30a1\u751f\u6210\u300d<\/td>\n            ST_Buffer<\/code>\uff08geometry\/geography\uff09<\/td>\n            \u4fb5\u5165\u30be\u30fc\u30f3\u53ef\u8996\u5316\u3001\u5371\u967a\u57df\u751f\u6210\uff08\u305f\u3060\u3057\u5358\u4f4d\u3068\u6295\u5f71\u306b\u6ce8\u610f\uff09<\/td>\n          <\/tr>\n          
\u300c\u30dd\u30ea\u30b4\u30f3\u540c\u58eb\u306e\u4ea4\u5dee\u9762\u7a4d\u300d<\/td>\n            ST_Intersection<\/code>, ST_Area<\/code><\/td>\n            \u91cd\u306a\u308a\u5272\u5408\u3067\u30ea\u30b9\u30af\u30b9\u30b3\u30a2\u5316\u304c\u3067\u304d\u308b<\/td>\n          <\/tr>\n          
\u300c\u6700\u5bc4\u308a1\u4ef6\u3092\u9ad8\u901f\u306b\u300d<\/td>\n            <-><\/code>\uff08KNN\uff09<\/td>\n            GIST\u3067\u6700\u5bc4\u308a\u8fd1\u4f3c\u3092\u901f\u304f\u51fa\u305b\u308b\uff08\u5927\u91cf\u30c7\u30fc\u30bf\u5411\u3051\uff09<\/td>\n          <\/tr>\n          
\u300c\u7dda\u306b\u30b9\u30ca\u30c3\u30d7\u300d<\/td>\n            ST_ClosestPoint<\/code>, ST_LineLocatePoint<\/code><\/td>\n            \u9053\u8def\u4e2d\u5fc3\u7dda\u306b\u5bc4\u305b\u308b\u3001\u5de1\u8996\u30eb\u30fc\u30c8\u4e0a\u306e\u4f4d\u7f6e\u88dc\u6b63\u306a\u3069<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    9. \u5b9f\u904b\u7528\u306e\u52d8\u6240\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30fbSRID\u30fb\u8ddd\u96e2\u5358\u4f4d\u30fb\u6027\u80fd\uff09<\/h2>\n    \n      \n        \n          \n          \n            \n            \n            \n            \n            \n            \u9805\u76ee<\/th> \u7d50\u8ad6\uff08\u4e8b\u6545\u3089\u306a\u3044\u8a2d\u5b9a\uff09<\/th><\/tr>\n        <\/thead>\n        
SRID<\/td>\n            GPS\u306e\u7def\u5ea6\u7d4c\u5ea6\u306f SRID=4326<\/b> \u56fa\u5b9a\uff08\u6df7\u305c\u306a\u3044\uff09<\/td>\n          <\/tr>\n          
\u8ddd\u96e2\u5358\u4f4d<\/td>\n            \u8ddd\u96e2\u3092m\u3067\u6271\u3046\u306a\u3089 Geography<\/b>\uff08\u4eca\u56de\u306ePOINT\uff09<\/td>\n          <\/tr>\n          
\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/td>\n            GIST<\/b> \u3092\u5fc5\u305a\u8cbc\u308b\uff08\u8fd1\u508d\u30fb\u4ea4\u5dee\u304c\u6841\u9055\u3044\u306b\u901f\u304f\u306a\u308b\uff09<\/td>\n          <\/tr>\n          
\u8fd4\u5374\u4ef6\u6570<\/td>\n            API\u306f\u5fc5\u305a limit<\/code> \u3092\u6301\u3064\uff08\u7121\u5236\u9650\u8fd4\u5374\u306fDoS\u3068\u540c\u3058\uff09<\/td>\n          <\/tr>\n          
\u6027\u80fd\u78ba\u8a8d<\/td>\n            EXPLAIN (ANALYZE, BUFFERS)<\/code> \u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u52b9\u3044\u3066\u308b\u304b\u78ba\u8a8d<\/td>\n          <\/tr>\n          
DB\u4fdd\u5b88<\/td>\n            \u5b9a\u671f\u7684\u306b VACUUM (ANALYZE)<\/code>\uff08\u81ea\u52d5\u3067\u3082\u72b6\u6cc1\u6b21\u7b2c\u3067\u624b\u52d5\uff09<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n\n      \n        \u8fd1\u508d\u691c\u7d22\u304c\u9045\u3044\u3068\u304d\u306e9\u5272\u306f\u300cGIST\u8cbc\u3063\u3066\u306a\u3044\u300d\u300c\u30ad\u30e3\u30b9\u30c8\u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u6b7b\u3093\u3067\u308b\u300d\u300c\u6761\u4ef6\u304c\u30ba\u30ec\u3066\u5168\u4ef6\u8d70\u67fb\u300d\u3067\u3059\u3002\n        \u201c\u9045\u3044\u201d\u306f\u3060\u3044\u305f\u3044\u7406\u7531\u304c\u5358\u7d14\u3002DB\u306f\u6b63\u76f4\u3002\n      <\/p>\n    <\/div>\n\n    
10. \u3088\u304f\u3042\u308b\u30c8\u30e9\u30d6\u30eb\u3068\u5373\u89e3\u6c7a<\/h2>\n    \n      10.1 extension \"postgis\" is not available<\/code><\/h3>\n      \u7d50\u8ad6\uff1aPostGIS\u304c\u5165\u3063\u3066\u306a\u3044 \/ PG\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u5408\u3063\u3066\u306a\u3044\u3002<\/p>\n      
sudo apt update\nsudo apt install -y postgis\nPG_MAJOR=$(psql -V | awk '{print $3}' | cut -d. -f1)\nsudo apt install -y \"postgresql-$PG_MAJOR-postgis-3\" \"postgresql-$PG_MAJOR-postgis-3-scripts\"<\/code><\/pre>\n\n      <\/div>\n\n      10.2 FATAL: password authentication failed<\/code><\/h3>\n      \n        \u30e6\u30fc\u30b6\u30fc\u540d\/\u30d1\u30b9\u30ef\u30fc\u30c9\u304c\u9055\u3046\uff08\u307e\u305a\u3053\u3053\uff09<\/li>\n        
pg_hba.conf<\/code> \u304c peer\/scram \u3067\u60f3\u5b9a\u3068\u9055\u3046<\/li>\n      <\/ul>\n      \n        \u307e\u305a psql<\/code> \u3067\u540c\u3058\u8a8d\u8a3c\u60c5\u5831\u3067\u5165\u308c\u308b\u304b\u78ba\u8a8d\u3002\u5165\u308c\u306a\u3044\u306a\u3089\u30a2\u30d7\u30ea\u4ee5\u524d\u306e\u554f\u984c\u3067\u3059\u3002\n      <\/p>\n\n      
<\/div>\n\n      10.3 \u201c\u8fd1\u508d\u691c\u7d22\u304c\u9045\u3044\u201d<\/h3>\n      \u7d50\u8ad6\uff1a\u3060\u3044\u305f\u3044 GIST\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u7121\u3057<\/b> \u304b\u3001\u30ad\u30e3\u30b9\u30c8\u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u7121\u52b9\u5316<\/b>\u3002<\/p>\n      
-- DB\u3067\u78ba\u8a8d\uff08appdb\u3067\uff09\n\\d places\n-- ix_places_location_gist \u304c\u3042\u308b\u304b\u78ba\u8a8d\n\n-- \u52b9\u3044\u3066\u308b\u304b\u78ba\u8a8d\nEXPLAIN (ANALYZE, BUFFERS)\nSELECT id\nFROM places\nWHERE ST_DWithin(\n  location,\n  ST_GeogFromText('SRID=4326;POINT(139.767125 35.681236)'),\n  300\n);<\/code><\/pre>\n\n      <\/div>\n\n      10.4 \u7def\u5ea6\u7d4c\u5ea6\u304c\u9006\u3063\u307d\u3044<\/h3>\n      \u7d50\u8ad6\uff1aWKT\u306f POINT(lon lat)<\/b>\u3002lon\u304c\u5148\u3002\u3053\u308c\u3092\u9593\u9055\u3048\u308b\u3068\u5168\u30c7\u30fc\u30bf\u304c\u6d77\u306b\u98db\u3073\u307e\u3059\u3002<\/p>\n    <\/div>\n\n    
\n      \n        \u3053\u3053\u307e\u3067\u3067\u300cUbuntu\u4e0a\u306ePostGIS\u3092\u4f7f\u3063\u3066\u3001Flask API\u304b\u3089\u7a7a\u9593\u691c\u7d22\u30fb\u5224\u5b9a\u3092\u52d5\u304b\u3059\u300d\u307e\u3067\u4e00\u901a\u308a\u5b8c\u6210\u3002\n        \u6b21\u306e\u73fe\u5b9f\u7684\u306a\u62e1\u5f35\u306f\u3001\u2460\u5b9f\u30c7\u30fc\u30bf\uff08\u884c\u653fGeoJSON\uff09\u53d6\u8fbc\u30b9\u30af\u30ea\u30d7\u30c8\u3001\u2461\u8a8d\u8a3c\uff08JWT\u7b49\uff09\u3068\u6a29\u9650\u3001\u2462gunicorn + nginx\u3001\u2463\u76e3\u8996\uff08pg_stat_statements\uff09\u3067\u3059\u3002\n      <\/p>\n    <\/div>\n\n  <\/div>\n<\/div>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"
\u76ee\u7684\uff1aPostgreSQL + PostGIS \u306b\u5730\u7406\u60c5\u5831\uff08POINT\/\u30dd\u30ea\u30b4\u30f3\u7b49\uff09\u3092\u683c\u7d0d\u3057\u3001Flask API \u304b\u3089 CRUD \u3068\u7a7a\u9593\u691c\u7d22\uff08\u8fd1\u508d\/\u7bc4\u56f2\/\u5185\u5305\u5224\u5b9a\uff09\u3092\u52d5\u304b\u3059\u3002 \u63a8\u5968\uff1aPostgreSQL 16+ \/ Po […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"saved_in_kubio":false,"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"vkexunit_cta_each_option":"","footnotes":""},"categories":[6],"tags":[],"class_list":["post-1845","post","type-post","status-publish","format-standard","hentry","category-programing"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/1845","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1845"}],"version-history":[{"count":1,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/1845\/revisions"}],"predecessor-version":[{"id":1846,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/1845\/revisions\/1846"}],"wp:attachment":[{"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1845"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1845"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}