difference

difference.ipynb

@@ -0,0 +1,159 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "00982ea4-b630-4233-b6df-354af3498ed2",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "e84709ab-1b47-49ee-8cbd-8aa69744b6c3",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "application/vnd.jupyter.widget-view+json": {
+       "model_id": "a4103c257b7b4691a0a86d817390e9ca",
+       "version_major": 2,
+       "version_minor": 0
+      },
+      "text/plain": [
+       "FloatProgress(value=0.0, layout=Layout(width='auto'), style=ProgressStyle(bar_color='black'))"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "application/vnd.jupyter.widget-view+json": {
+       "model_id": "31245f0a73634185b297464775ba4c13",
+       "version_major": 2,
+       "version_minor": 0
+      },
+      "text/plain": [
+       "FloatProgress(value=0.0, layout=Layout(width='auto'), style=ProgressStyle(bar_color='black'))"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
+   "source": [
+    "import ibis\n",
+    "from ibis import _\n",
+    "conn = ibis.duckdb.connect(\"tmp2\", extensions=[\"spatial\"])\n",
+    "\n",
+    "tbl = (\n",
+    "    conn.read_parquet(\"https://data.source.coop/cboettig/ca30x30/ca_areas.parquet\")\n",
+    "    .cast({\"SHAPE\": \"geometry\"})\n",
+    "    .rename(geom = \"SHAPE\", gid = \"OBJECTID\")\n",
+    "   # .filter(_.UNIT_NAME == \"Angeles National Forest\")\n",
+    "    .filter(_.reGAP < 3) \n",
+    "    #.mutate(geom = _.geom.convert(\"epsg:3310\",\"epsg:4326\"))\n",
+    ")\n",
+    "\n",
+    "conn.create_table(\"t1\", tbl.filter(_.Release_Year == 2024))\n",
+    "conn.create_table(\"t2\", tbl.filter(_.Release_Year == 2023))\n",
+    "\n",
+    "conn.disconnect()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "121c3cad-680c-4f3a-9075-638711ea1634",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%%time\n",
+    "import duckdb\n",
+    "db = duckdb.connect(\"tmp2\")\n",
+    "db.install_extension(\"spatial\")\n",
+    "db.load_extension(\"spatial\")\n",
+    "\n",
+    "db.sql('''\n",
+    "CREATE OR REPLACE TABLE diff AS (\n",
+    "with temp as \n",
+    "(\n",
+    "  select   b.gid, st_union_agg(a.geom) as geom\n",
+    "  from     t1 b join t2 a on st_intersects(a.geom, b.geom)\n",
+    "  group by b.gid\n",
+    ") \n",
+    "select st_difference(b.geom,coalesce(t.geom, 'GEOMETRYCOLLECTION EMPTY'::geometry)) as geom\n",
+    "from t1 b left join temp t on b.gid = t.gid\n",
+    ")\n",
+    "''')\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "e0a31bd7-4b67-46ad-88c4-7c17d820d66b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#db.table(\"diff\").to_parquet(\"diff.parquet\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "28a66c8b-89fb-4972-9ff5-ee9bfdf148e9",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "conn = ibis.duckdb.connect(\"tmp\", extensions=[\"spatial\"])\n",
+    "gdf = conn.table(\"diff\").mutate(geom = _.geom.convert(\"epsg:3310\",\"epsg:4326\")).execute()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "308dc665-1323-4e9b-bc2d-69201c325c4b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import leafmap.maplibregl as leafmap\n",
+    "m = leafmap.Map()\n",
+    "m.add_gdf(gdf)\n",
+    "m\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "775abaca-f21a-4cd8-ad7d-0310cc6b33b6",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "\"TO 'new2024.geojson' WITH (FORMAT GDAL, DRIVER 'GeoJSON', LAYER_CREATION_OPTIONS 'WRITE_BBOX=YES')\""
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.11.10"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}