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

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Diego Ripley
2025-05-30 15:26:22 +00:00
parent a8b05a96f9
commit 6aedfe7c46
1 changed files with 24 additions and 20 deletions
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experiments/duckdb_census_of_population.ipynb
+24 -20
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@@ -2,7 +2,7 @@
"cells": [ "cells": [
{ {
"cell_type": "code", "cell_type": "code",
"execution_count": 40, "execution_count": 44,
"id": "56ac906e", "id": "56ac906e",
"metadata": {}, "metadata": {},
"outputs": [], "outputs": [],
@@ -14,7 +14,7 @@
}, },
{ {
"cell_type": "code", "cell_type": "code",
"execution_count": 41, "execution_count": 45,
"id": "708e293d", "id": "708e293d",
"metadata": {}, "metadata": {},
"outputs": [], "outputs": [],
@@ -35,14 +35,14 @@
}, },
{ {
"cell_type": "code", "cell_type": "code",
"execution_count": 42, "execution_count": 46,
"id": "580c82ad-f64d-439f-9055-2307fdf7cccd", "id": "580c82ad-f64d-439f-9055-2307fdf7cccd",
"metadata": {}, "metadata": {},
"outputs": [ "outputs": [
{ {
"data": { "data": {
"application/vnd.jupyter.widget-view+json": { "application/vnd.jupyter.widget-view+json": {
"model_id": "8c53af935cf44664a8b493f5133b87e7", "model_id": "4d154b54d66c48d48637165066492606",
"version_major": 2, "version_major": 2,
"version_minor": 0 "version_minor": 0
}, },
@@ -56,10 +56,10 @@
{ {
"data": { "data": {
"text/plain": [ "text/plain": [
"<duckdb.duckdb.DuckDBPyConnection at 0x7f0654aa5730>" "<duckdb.duckdb.DuckDBPyConnection at 0x7f0654926530>"
] ]
}, },
"execution_count": 42, "execution_count": 46,
"metadata": {}, "metadata": {},
"output_type": "execute_result" "output_type": "execute_result"
} }
@@ -71,11 +71,7 @@
"SELECT\n", "SELECT\n",
" geo.da_dguid,\n", " geo.da_dguid,\n",
" cop.count_total_4,\n", " cop.count_total_4,\n",
" CAST(\n", " (cop.count_total_1 / (ST_Area_Spheroid(ST_FlipCoordinates(geo.geom)) / 1000000.0)) AS count_total_4_per_square_km,\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",
" geo.geom\n", " geo.geom\n",
"FROM\n", "FROM\n",
" 'https://data.dataforcanada.org/processed/statistics_canada/census_of_population/2021/tabular/da_2021.parquet' AS cop,\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", "cell_type": "code",
"execution_count": 43, "execution_count": 47,
"id": "0528eeb4-fb89-4640-94c6-c0eda4cbe764", "id": "0528eeb4-fb89-4640-94c6-c0eda4cbe764",
"metadata": {}, "metadata": {},
"outputs": [ "outputs": [
{ {
"data": { "data": {
"text/plain": [ "text/plain": [
"<duckdb.duckdb.DuckDBPyConnection at 0x7f0654aa5730>" "<duckdb.duckdb.DuckDBPyConnection at 0x7f0654926530>"
] ]
}, },
"execution_count": 43, "execution_count": 47,
"metadata": {}, "metadata": {},
"output_type": "execute_result" "output_type": "execute_result"
} }
@@ -131,17 +127,17 @@
}, },
{ {
"cell_type": "code", "cell_type": "code",
"execution_count": 38, "execution_count": 48,
"id": "6d38118b", "id": "6d38118b",
"metadata": {}, "metadata": {},
"outputs": [ "outputs": [
{ {
"data": { "data": {
"text/plain": [ "text/plain": [
"<duckdb.duckdb.DuckDBPyConnection at 0x7f0704bb5e70>" "<duckdb.duckdb.DuckDBPyConnection at 0x7f0654926530>"
] ]
}, },
"execution_count": 38, "execution_count": 48,
"metadata": {}, "metadata": {},
"output_type": "execute_result" "output_type": "execute_result"
} }
@@ -168,17 +164,17 @@
}, },
{ {
"cell_type": "code", "cell_type": "code",
"execution_count": 39, "execution_count": 49,
"id": "c32ab0f8", "id": "c32ab0f8",
"metadata": {}, "metadata": {},
"outputs": [ "outputs": [
{ {
"data": { "data": {
"text/plain": [ "text/plain": [
"<duckdb.duckdb.DuckDBPyConnection at 0x7f0704bb5e70>" "<duckdb.duckdb.DuckDBPyConnection at 0x7f0654926530>"
] ]
}, },
"execution_count": 39, "execution_count": 49,
"metadata": {}, "metadata": {},
"output_type": "execute_result" "output_type": "execute_result"
} }
@@ -188,6 +184,14 @@
"COPY geo_data TO '{output_data_folder}/da_2021_private_dwellings.parquet' (FORMAT PARQUET);\n", "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": { "metadata": {