我有 1 个
folium.Map
,有 4 个功能组,每个 folium.Featuregroup
都有一个 folium.Choropleth
。
因此,我想使用我创建的
bins
列表为每个特征组设置线性比例,其中包括数据集中的 T*_depot_0
、2_depots
、3_depots
或 4_depots
列的分位数结果。
目前,我可以使用
branca
包创建线性色标并将其添加到我的地图中。但这会导致在地图上显示所有线性比例。
我正在寻找的是,当我使用图层控件从仓库1更改为仓库2时,显示仓库2的线性比例,并且不显示仓库1、3、4的比例。
我尝试使用
color_map
、add_to
方法将我的 add_child
添加到特定的要素组或 Choropleth,但这不起作用。
那么如何向特定特征组添加(并显示)线性比例?
def add_depot_markers_featuregroup(depot_amount, featuregroup):
for i in range(len(depots_locations)):
if i > depot_amount:
break
folium.Marker(
[depots_locations[i].y, depots_locations[i].x],
popup="Depot_{0}".format(i+1),
icon=folium.Icon(color='cadetblue', icon='solid fa-bicycle', prefix='fa')).add_to(featuregroup)
result_map = folium.Map(location=lat_long_groningen, zoom_start=11, tiles=None)
layer_depot_1 = folium.FeatureGroup(name="1 depot", overlay=False).add_to(result_map)
layer_depot_2 = folium.FeatureGroup(name="2 depots", overlay=False).add_to(result_map)
layer_depot_3 = folium.FeatureGroup(name="3 depots", overlay=False).add_to(result_map)
layer_depot_4 = folium.FeatureGroup(name="4 depots", overlay=False).add_to(result_map)
fs=[layer_depot_1, layer_depot_2, layer_depot_3, layer_depot_4]
for i in range(len(fs)):
add_depot_markers_featuregroup(i, fs[i])
depot_column_name = ""
if i == 0:
depot_column_name = "T*_depot_{0}".format(i)
else:
depot_column_name = "{0}_depots".format(i+1)
bins = list(results[depot_column_name].quantile([0, 0.25, 0.5, 0.75, 1]))
choropleth = folium.Choropleth(
results,
data=results,
key_on='feature.properties.Postcode',
columns=["Postcode", depot_column_name],
fill_color="YlOrRd",
fill_opacity = 0.8,
line_opacity = 0,
line_weight=1,
bins=bins,
highlight=True,
legend_name = "T* per postalcode area based on depot {0}".format(i+1),
threshold_scale=bins,
name="T* of {0} depot per Postalcode area".format(i+1)).geojson.add_to(fs[i])
highlight_function = lambda x: {
'fillColor': '#ffffff',
'color':'#000000',
'fillOpacity': 0.1,
'weight': 0.1
}
color_map = branca.colormap.LinearColormap(
colors=['#ffffd4', '#fed98e', '#fe9929', '#d95f0e', '#993404'],
index=bins,
vmin=bins[0],
vmax=bins[-1],
caption='Routelength per postcode area based on {0} depots'.format(i+1)
).add_to(result_map)
folium.GeoJson(data=results,
name="tooltip " + depot_column_name,
tooltip=folium.GeoJsonTooltip(fields=['Postcode', "Deliveries", "Area (km2)", "Number of cyclists", "Beardwood approx", depot_column_name], labels=True, sticky=True),
style_function=lambda feature: {
"color": "black",
"weight": 0.5,
},
highlight_function=highlight_function
).add_to(choropleth)
# add legend: https://stackoverflow.com/questions/52911688/python-folium-choropleth-map-colors-incorrect/52981115#52981115
# min_values = results[["T*_depot_0", "2_depots", "3_depots", "4_depots"]].min()
# max_values = results[["T*_depot_0", "2_depots", "3_depots", "4_depots"]].max()
# color_index = range(round(min_values.min()), round(max_values.max()), 5)
# color_map = branca.colormap.LinearColormap(
# colors=['#ffffd4', '#fed98e', '#fe9929', '#d95f0e', '#993404'],
# index=color_index,
# vmin=min_values.min(),
# vmax=max_values.max(),
# caption='Routelength per postcode area'
# ).add_to(result_map)
folium.TileLayer(overlay=True, show=True, control=False, name="T* openstreet").add_to(result_map)
folium.TileLayer('cartodbdark_matter',overlay=True, show=False, name="T* dark mode").add_to(result_map)
folium.TileLayer('cartodbpositron',overlay=True, show=False, name="T* light mode").add_to(result_map)
folium.LayerControl(collapsed=False).add_to(result_map)
result_map.save("lastmilegroningen.html")
result_map
我认为你需要类似这个的东西。
这里的基本思想是将每个
colormap
绑定到你的FeatureGroup
。
这意味着您需要链接帖子的这一部分:
from branca.element import MacroElement
from jinja2 import Template
class BindColormap(MacroElement):
"""Binds a colormap to a given layer.
Parameters
----------
colormap : branca.colormap.ColorMap
The colormap to bind.
"""
def __init__(self, layer, colormap):
super(BindColormap, self).__init__()
self.layer = layer
self.colormap = colormap
self._template = Template(u"""
{% macro script(this, kwargs) %}
{{this.colormap.get_name()}}.svg[0][0].style.display = 'block';
{{this._parent.get_name()}}.on('overlayadd', function (eventLayer) {
if (eventLayer.layer == {{this.layer.get_name()}}) {
{{this.colormap.get_name()}}.svg[0][0].style.display = 'block';
}});
{{this._parent.get_name()}}.on('overlayremove', function (eventLayer) {
if (eventLayer.layer == {{this.layer.get_name()}}) {
{{this.colormap.get_name()}}.svg[0][0].style.display = 'none';
}});
{% endmacro %}
""") # noqa
最后,您不会将
colormap
和 FeatureGroup
添加到地图中,而是绑定它们,然后将它们添加到地图中,如下所示:
m.add_child(BindColormap(color_map, i)
设法找到解决方法。由于某种原因,Choroplet 对象不存在这种问题,即您无法在 for 循环中真正使用它。底层的 GeoJson 和 StepColormap 对象可访问 choropleth.geojson 和 choropleth.color_scale