目标:使用ArcGIS的驾驶时间计算数据,并使用Folium而不是ArcGIS/ESRI的地图显示结果
说明:使用arcgis软件包,我能够获得给定点周围的驾驶时间数据,为我提供地图上显示的边界区域。使用ArcGIS可以很好地显示来自ArcGIS、地图的数据,但是,通常在ArcGIS地图上显示其他元素(例如半径、单个点和任何带有自定义图标的元素)的速度非常慢,而且要花费更多的时间。然而,Folium可以很好地显示所有这些额外的数据,并且加载速度比ArcGIS快得多
障碍:我正在寻找一种方法来使用从ArcGIS返回的数据,然后使用Folium显示它。我遇到的问题是,来自ArcGIS的数据,虽然它说它包括坐标数据,但其值太大,无法表示纬度/经度。似乎有某种方法可以“解码”这些值,以便与Folium一起使用,或者在我尝试将其与Folium一起使用时,我只是没有将ArcGIS中的数据用作正确的数据类型
import pandas
import arcgis
import webview
data = {'address': {0:'2015 Terminal Way'}, 'city': {0:'Reno'}, 'state': {0: 'NV'}, 'zip': {0:'89502'}}
df = pandas.DataFrame(data)
# Obviously I'm unable to include my username and password - which I understand probably limits who can help with this question since without logging in, you wouldn't be able to test my code, but there's nothing I can do about it
my_gis = arcgis.gis.GIS("https://www.arcgis.com", username, password)
address_layer = my_gis.content.import_data(df, address_fields={"Address":"address","City":"city","State":"state","Zip":"zip"})
target = arcgis.features.use_proximity.create_drive_time_areas(input_layer=address_layer, break_values=[5], break_units="Minutes", overlap_policy="Overlap")
# NOTE - ArcGIS documentation states that if an output name is given, the return object is a FeatureSet, but since I leave it blank, it is a FeatureCollection - not sure if that matters either
drivetime_data_geojson = target.query().to_geojson
# The above line returns as below, though trimmed down a bit to save space - I'm so sorry it's so long but pasting it in was the only way I could think of to allow others to test it in Folium
drivetime_data_geojson = '{"type": "FeatureCollection", "features": [{"type": "Feature", "geometry":
{"type": "Polygon", "coordinates": [[[-13334722.942400001, 4801659.346199997], [-13334622.9429,
4801594.495999999], [-13334572.9431, 4801335.0988000035], [-13334572.9431, 4800232.736199997],
[-13334197.9448, 4800232.736199997], [-13334122.9452, 4800297.577799998], [-13334022.945700001,
4800167.895199999], [-13334047.945500001, 4800005.794399999], [-13334122.9452, 4799940.954700001],
[-13334572.9431, 4799940.954700001], [-13334622.9429, 4799227.746699996], [-13334497.943500001,
4799195.329400003], [-13334447.9437, 4799065.6611], [-13334222.944699999, 4799065.6611],
[-13333947.9459, 4798968.4108000025], [-13333522.947900001, 4798676.666100003], [-13332722.9515,
4798579.419799998], [-13332622.952, 4798449.759499997], [-13332722.9515, 4798287.686399996],
[-13333247.9492, 4798320.100699998]]]}}]}'
# This is how it would be displayed using ArcGIS
# Creating the basemap image
map = my_gis.map(location='2015 Terminal Way Reno, NV 89502')
# Adding the layer to the map
map.add_layer(drivetime_data)
folder_path = os.getcwd()
path_to_map = folder_path + '\\arcgis_to_folium.html'
# webview is just a lightweight browser package that allows for easy viewing of these maps
webview.create_window('MAP', path_to_map)
webview.start()
Folium看起来与此类似——尽管正如我所说,GeoJson数据现在还没有被引入:
import folium
folium_map = folium.Map(location=[39.505745, -119.77869])
drivetime_layer = folium.FeatureGroup(name='Drive Time')
folium.GeoJson(drivetime_data_geojson).add_to(drivetime_layer)
drivetime_layer.add_to(folium_map)
folium.LayerControl().add_to(folium_map)
folium_map.save('folium_drivetime_attempt.html')
path_to_map = folder_path + '\\folium_drivetime_attempt.html'
webview.create_window('MAP', path_to_map)
webview.start()
此地图将加载,但不会有任何图层。我知道这个geojson可以工作:
drivetime_data_geojson = '{"type": "FeatureCollection", "features": [{
"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [
[[-119.766227, 39.856011], [-120.260612, 39.251417], [-119.067222, 39.246099]]]}}]}'
因为它使用GPS坐标,而不是ArcGIS的这些奇怪值。因此,实际上,问题在于如何从ArcGIS中“解码”这些值或将其转换为正确的数据类型。非常感谢您的任何帮助、建议或想法
有两个问题你必须处理。第一个是将ArcGIS x,y转换为lat,lon,这可以通过以下功能完成:
与
drivetime_data_geojson = target.query().to_geojson
使用drivetime_data_dict = target.query().to_dict()
不同,您会注意到,当您将其转换为字典时,键“坐标”将更改为“环”,这对下一步很重要。接下来,迭代dict并针对坐标值运行上述函数,以将其更新为GPS坐标。然后,您需要调整字典的格式,使其成为folium可以识别的内容,并从本质上提取“环”数据,该数据现在包含您的坐标值,如下所示:现在只需创建一个folium FeatureGroup:
并将
default_geojson_structure
加载到以下函数中,并将其添加到层中在保存地图和不保存地图以及运行webview方面,像在那里做的那样做其余的事情,您将看到地图和您的行车时间边界
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