Update DuckDB example so it calculates the area of a polygon properly

experiments/duckdb_census_of_population.ipynb

@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 40,
+   "execution_count": 44,
    "id": "56ac906e",
    "metadata": {},
    "outputs": [],
@@ -14,7 +14,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 41,
+   "execution_count": 45,
    "id": "708e293d",
    "metadata": {},
    "outputs": [],
@@ -35,14 +35,14 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 42,
+   "execution_count": 46,
    "id": "580c82ad-f64d-439f-9055-2307fdf7cccd",
    "metadata": {},
    "outputs": [
     {
      "data": {
       "application/vnd.jupyter.widget-view+json": {
-       "model_id": "8c53af935cf44664a8b493f5133b87e7",
+       "model_id": "4d154b54d66c48d48637165066492606",
        "version_major": 2,
        "version_minor": 0
       },
@@ -56,10 +56,10 @@
     {
      "data": {
       "text/plain": [
-       "<duckdb.duckdb.DuckDBPyConnection at 0x7f0654aa5730>"
+       "<duckdb.duckdb.DuckDBPyConnection at 0x7f0654926530>"
       ]
      },
-     "execution_count": 42,
+     "execution_count": 46,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -71,11 +71,7 @@
     "SELECT\n",
     "    geo.da_dguid,\n",
     "    cop.count_total_4,\n",
-    "    CAST(\n",
-    "        ROUND(\n",
-    "            (cop.count_total_1 / (ST_AREA_SPHEROID(geo.geom) / 1000000.0)), 0\n",
-    "        ) AS INTEGER\n",
-    "    ) AS count_total_4_per_square_km,\n",
+    "    (cop.count_total_1 / (ST_Area_Spheroid(ST_FlipCoordinates(geo.geom)) / 1000000.0)) AS count_total_4_per_square_km,\n",
     "    geo.geom\n",
     "FROM\n",
     "    'https://data.dataforcanada.org/processed/statistics_canada/census_of_population/2021/tabular/da_2021.parquet' AS cop,\n",
@@ -94,17 +90,17 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 43,
+   "execution_count": 47,
    "id": "0528eeb4-fb89-4640-94c6-c0eda4cbe764",
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "<duckdb.duckdb.DuckDBPyConnection at 0x7f0654aa5730>"
+       "<duckdb.duckdb.DuckDBPyConnection at 0x7f0654926530>"
       ]
      },
-     "execution_count": 43,
+     "execution_count": 47,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -131,17 +127,17 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 38,
+   "execution_count": 48,
    "id": "6d38118b",
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "<duckdb.duckdb.DuckDBPyConnection at 0x7f0704bb5e70>"
+       "<duckdb.duckdb.DuckDBPyConnection at 0x7f0654926530>"
       ]
      },
-     "execution_count": 38,
+     "execution_count": 48,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -168,17 +164,17 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 39,
+   "execution_count": 49,
    "id": "c32ab0f8",
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "<duckdb.duckdb.DuckDBPyConnection at 0x7f0704bb5e70>"
+       "<duckdb.duckdb.DuckDBPyConnection at 0x7f0654926530>"
       ]
      },
-     "execution_count": 39,
+     "execution_count": 49,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -188,6 +184,14 @@
     "COPY geo_data TO '{output_data_folder}/da_2021_private_dwellings.parquet' (FORMAT PARQUET);\n",
     "\"\"\")"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "5f519fe1-b641-4230-b3ed-645f1126e335",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {