{
"cells": [
{
"cell_type": "code",
"execution_count": 1,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"0.3.0+162.g0540622.dirty\n"
]
}
],
"source": [
"import os\n",
"import folium\n",
"\n",
"print(folium.__version__)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Using Leaflet's Smooth Factor Option\n",
"\n",
"[Polyline](http://leafletjs.com/reference.html#polyline) objects in leaflet are smoothed by default. This removes points from the line, putting less load on the browser when drawing. The level of smoothing [can be specified](http://leafletjs.com/reference.html#polyline-smoothfactor) by passing `smoothFactor` as an option when creating any Polyline object.\n",
"\n",
"In folium, the level of smoothing can be determined by passing `smooth_factor` as an argument when initialising GeoJson, TopoJson and Choropleth objects. There are no upper or lower bounds to the smoothing level; Leaflet's default is 1."
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"scrolled": false
},
"outputs": [
{
"data": {
"text/html": [
""
],
"text/plain": [
""
]
},
"execution_count": 2,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"m = folium.Map(\n",
" location=[-59.1759, -11.6016],\n",
" tiles='Mapbox Bright',\n",
" zoom_start=2\n",
")\n",
"\n",
"\n",
"fname = os.path.join('data', 'antarctic_ice_shelf_topo.json')\n",
"\n",
"folium.TopoJson(\n",
" data=open(fname),\n",
" object_path='objects.antarctic_ice_shelf',\n",
" name='default_smoothing',\n",
" smooth_factor=1\n",
").add_to(m)\n",
"\n",
"\n",
"folium.TopoJson(\n",
" data=open(fname),\n",
" object_path='objects.antarctic_ice_shelf',\n",
" name='default_smoothing',\n",
" smooth_factor=10,\n",
" style_function=lambda x: {'color': '#004c00', 'opacity': '0.7'}\n",
").add_to(m)\n",
"\n",
"folium.LayerControl().add_to(m)\n",
"\n",
"m.save(os.path.join('results', 'SmoothFactor.html'))\n",
"\n",
"m"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 2",
"language": "python",
"name": "python2"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.13"
}
},
"nbformat": 4,
"nbformat_minor": 1
}