Plot colored polygons with geodataframe in folium

Question

I\'m trying to plot radar data in folium, and I\'m almost there. I followed this example (Contour plot data (lat,lon,value) within boundaries and export GeoJSON) to get my data

Answer 1

I think I figured it out. In my previous code, polygon.get_facecolor() returns a list of RGBA values ranging from 0-1. I added this function (modified from this post):

def convert_to_hex(rgba_color) :
    red = str(hex(int(rgba_color[0]*255)))[2:].capitalize()
    green = str(hex(int(rgba_color[1]*255)))[2:].capitalize()
    blue = str(hex(int(rgba_color[2]*255)))[2:].capitalize()

    if blue=='0':
        blue = '00'
    if red=='0':
        red = '00'
    if green=='0':
        green='00'

    return '#'+ red + green + blue

to convert it to a hex string. Then:

gdf['RGBA'] = convert_to_hex(colors)

Then to plot the colors in folium, I do:

maploc = folium.Map(location=[42.377157,-71.236088],zoom_start=10,tiles="Stamen Toner")

colors = []
folium.GeoJson(
    gdf,
    style_function=lambda feature: {
        'fillColor': feature['properties']['RGBA'],
        'color' : feature['properties']['RGBA'],
        'weight' : 1,
        'fillOpacity' : 0.5,
        }
    ).add_to(maploc)

and that created a really nice looking plot! (The property name is a bit misleading - it's not actually RGBA values, but hex strings.)