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{
"cells": [
{
"cell_type": "code",
"execution_count": null,
"id": "0",
"metadata": {},
"outputs": [],
"source": [
"# %pip install leafmap"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "1",
"metadata": {},
"outputs": [],
"source": [
"import json\n",
"import duckdb\n",
"import ipywidgets as widgets\n",
"import leafmap.maplibregl as leafmap\n",
"import matplotlib.pyplot as plt\n",
"\n",
"m = leafmap.Map(sidebar_visible=True, layer_manager_expanded=False, height=\"800px\")\n",
"m.add_basemap(\"Esri.WorldImagery\", before_id=m.first_symbol_layer_id, visible=False)\n",
"m.add_draw_control(controls=[\"polygon\", \"trash\"])\n",
"m"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "2",
"metadata": {},
"outputs": [],
"source": [
"con = duckdb.connect()\n",
"con.install_extension(\"httpfs\")\n",
"con.install_extension(\"spatial\")\n",
"con.install_extension(\"h3\", repository=\"community\")\n",
"con.load_extension(\"httpfs\")\n",
"con.load_extension(\"spatial\")\n",
"con.load_extension(\"h3\")\n",
"\n",
"url = \"https://data.gishub.org/duckdb/h3_res4_geo.parquet\"\n",
"\n",
"con.sql(\n",
" f\"CREATE TABLE IF NOT EXISTS h3_res4_geo AS SELECT * FROM read_parquet('{url}');\"\n",
")\n",
"\n",
"colormaps = sorted(plt.colormaps())\n",
"\n",
"checkbox = widgets.Checkbox(\n",
" description=\"3D Map\",\n",
" value=True,\n",
" style={\"description_width\": \"initial\"},\n",
" layout=widgets.Layout(width=\"initial\"),\n",
")\n",
"outline_chk = widgets.Checkbox(\n",
" description=\"Add Hexagon Outline\",\n",
" value=False,\n",
" style={\"description_width\": \"initial\"},\n",
" layout=widgets.Layout(width=\"initial\"),\n",
")\n",
"\n",
"colormap_dropdown = widgets.Dropdown(\n",
" options=colormaps,\n",
" description=\"Colormap:\",\n",
" value=\"inferno\",\n",
" style={\"description_width\": \"initial\"},\n",
")\n",
"class_slider = widgets.IntSlider(\n",
" description=\"Class:\",\n",
" min=1,\n",
" max=10,\n",
" step=1,\n",
" value=5,\n",
" style={\"description_width\": \"initial\"},\n",
")\n",
"apply_btn = widgets.Button(description=\"Apply\")\n",
"close_btn = widgets.Button(description=\"Close\")\n",
"output_widget = widgets.Output()\n",
"with output_widget:\n",
" print(\"Draw a polygon on the map. Then, \\nclick on the 'Apply' button\")\n",
"\n",
"\n",
"def on_apply_btn_click(change):\n",
" with output_widget:\n",
" try:\n",
" output_widget.clear_output()\n",
" if len(m.draw_features_selected) > 0:\n",
" geojson = m.draw_features_selected[0][\"geometry\"]\n",
" df = con.sql(\n",
" f\"\"\"\n",
" SELECT * EXCLUDE (geometry), ST_AsText(geometry) AS geometry FROM h3_res4_geo\n",
" WHERE ST_Intersects(geometry, ST_GeomFromGeoJSON('{json.dumps(geojson)}'));\n",
" \"\"\"\n",
" ).df()\n",
" gdf = leafmap.df_to_gdf(df)\n",
" if \"H3 Hexagon\" in m.layer_dict:\n",
" m.remove_layer(\"H3 Hexagon\")\n",
"\n",
" if outline_chk.value:\n",
" outline_color = \"rgba(255, 255, 255, 255)\"\n",
" else:\n",
" outline_color = \"rgba(255, 255, 255, 0)\"\n",
"\n",
" if checkbox.value:\n",
" m.add_data(\n",
" gdf,\n",
" column=\"building_count\",\n",
" scheme=\"JenksCaspall\",\n",
" cmap=colormap_dropdown.value,\n",
" k=class_slider.value,\n",
" outline_color=outline_color,\n",
" name=\"H3 Hexagon\",\n",
" before_id=m.first_symbol_layer_id,\n",
" extrude=True,\n",
" fit_bounds=False,\n",
" add_legend=False,\n",
" )\n",
" else:\n",
" m.add_data(\n",
" gdf,\n",
" column=\"building_count\",\n",
" scheme=\"JenksCaspall\",\n",
" cmap=colormap_dropdown.value,\n",
" k=class_slider.value,\n",
" outline_color=outline_color,\n",
" name=\"H3 Hexagon\",\n",
" before_id=m.first_symbol_layer_id,\n",
" fit_bounds=False,\n",
" add_legend=False,\n",
" )\n",
"\n",
" m.remove_from_sidebar(name=\"Legend\")\n",
" m.add_legend_to_sidebar(\n",
" title=\"Building Count\",\n",
" legend_dict=m.legend_dict,\n",
" )\n",
" except Exception as e:\n",
" with output_widget:\n",
" print(e)\n",
"\n",
"\n",
"def on_close_btn_click(change):\n",
" m.remove_from_sidebar(name=\"H3 Hexagonal Grid\")\n",
"\n",
"\n",
"apply_btn.on_click(on_apply_btn_click)\n",
"close_btn.on_click(on_close_btn_click)\n",
"\n",
"widget = widgets.VBox(\n",
" [\n",
" widgets.HBox([checkbox, outline_chk]),\n",
" colormap_dropdown,\n",
" class_slider,\n",
" widgets.HBox([apply_btn, close_btn]),\n",
" output_widget,\n",
" ]\n",
")\n",
"m.add_to_sidebar(widget, label=\"H3 Hexagonal Grid\", widget_icon=\"mdi-hexagon-multiple\")"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "geo",
"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": "3.12.9"
}
},
"nbformat": 4,
"nbformat_minor": 5
}
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