Geographic Information Systems Asked by Brocolus on May 22, 2021
I have written a Folium map of a French city with the possibility of visualizing attributes information on click for each of its polygon which makes a huge file after 2 hours of calculation with the Jupyter notebook.
At the end I could save the work in a HTML file but when I try to visualize the map, my browser crashes each time. So I’m wondering if it is a limitation of Leaflet which isn’t able to handle such a big volume or is it because of the browser?
The resulting file weights about 750MB which is a lot and I don’t know if there is a solution such as a cloud computing or something else to see the result.
EDIT : Here is some code I’m loading, I’ve loaded 3 shapefiles where I first make a join in order to get some attribute information in just one layer which I saved in marseille_label.shp
. I’ve loaded it back row by row with the function getRow()
(from another stackoverflow post) in order to : highlight on hover for each component, have the search&zoom on each id of the map I’m looking for and lastly to get attributes on click.
The code works on small scale but when I do it for a whole city it gets really fat and the html rendered file isn’t working anymore.
%matplotlib inline
import geopandas as gpd
import pandas as pd
import os
def getRows(fn, idxList):
reader = fiona.open(fn)
return gpd.GeoDataFrame.from_features([reader[x] for x in idxList])
marseillePlot =
gpd.read_file(os.path.abspath(os.path.join(save_path,"marseille_label.shp")))
geo_marseillePlot = marseillePlot.to_crs({'init':'epsg:4326'})
carteMarseille = folium.Map(location=[43.3,5.4],
zoom_start=14,
control_scale=True)
zoneMarseille = folium.features.GeoJson(marseillePlot,
name='marseille',
style_function=lambda feature:{'weight':0,
'fillColor':'#00000000',
'color':'red'},
highlight_function=lambda feature:{'weight':4,
'color':'red'},
tooltip=folium.features.GeoJsonTooltip(fields=['nomcommune','idu'],
aliases=['Arrondissement','Num parcelle'],
localize=True)
).add_to(carteMarseille)
marseilleSearch = Search(layer=zoneMarseille,
geom_type='Polygon',
placeholder="Veuillez renseigner un numero de parcelle",
collapsed=False,
search_label='idu',
weight=6
).add_to(carteMarseille)
MousePosition(
position="topright",
prefix= u"Coordonnées :",
separator=" | "
).add_to(carteMarseille)
Draw(export=True).add_to(carteMarseille)
Fullscreen(position='topleft').add_to(carteMarseille)
#folium.LayerControl().add_to(carteMarseille)
for i in range(len(marseillePlot)):
extract_polygon = [geo_marseillePlot.geometry[i]]
out_df = getRows(os.path.abspath(os.path.join(save_path,"marseille_label.shp")), [i])
out_df.geometry = extract_polygon
out_df.crs = {'init':'epsg:4326'}
df_output_html=out_df.to_html(classes='table table-striped table-hover table-condensed table-responsive')
selection = folium.features.GeoJson(out_df,
name='selection_{}'.format(int(i)),
control=False,
style_function=lambda feature:{'weight':1,
'fillColor':'#00000000',
'color':'black'},
highlight_function=lambda feature:{'weight':4,
'color':'red'},
tooltip=folium.features.GeoJsonTooltip(fields=['nomcommune','idu'],
aliases=['Arrondissement','Num parcelle'],
localize=True)
).add_to(carteMarseille)
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