How to set shapefile (.shp, .zip) to lon and lat and hover on the region (geo object)?

📊 Plotly Python
1

How to set shapefile (.shp, .zip) to lon. and lat. and hover on the region (geo object) …?

for the example from plotly … .https://plot.ly/python/county-level-choropleth
I need an hover text effect on the region.

2

@jimmybow The choropleth at the link above is created via mapbox with source a geojson file. If you have a shapefile you can convert it to
a geojson file following the steps described here: https://www.statsilk.com/maps/convert-esri-shapefile-map-geojson-format
or just use another free tool…
In order to display an information on hover over each region (polygon in geojson) define a list of locations in each region and their lon and lat.
Then plot the points representing those locations via scattermapbox, with a color identical to the color assigned to the corresponding region when you create the choropleth.
See also this thread: https://community.plotly.com/t/choropleth-map-in-dash/4807/

3

Do you mean I need have both (type : Point) and (type : Polygon) information together in the geojson file (or dict) for a region, and add points, which are in the (type : Point) in the geojson, to the scattermapbox …? :laughing: :hushed:

 "features":[
   
 { "type": "Feature",
            "geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
            "properties": {"prop0": "value0"}
            },

    { "type": "Feature",
             "geometry": {
               "type": "Polygon",
               "coordinates": [
                 [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0],
                   [100.0, 1.0], [100.0, 0.0] ]
                 ]
             },
             "properties": {
               "prop0": "value0",
               "prop1": {"this": "that"}
               }
             }

]
4

@jimmybow It would be nice to find a file that contains as Point(s) the locations in each Polygon, but if is not the case you should collect this information from the WEB.

For my plot I picked up the lon and lat for the points of interest:

regions=[feature['properties']['NAME_1'] for feature in geoJSON['features']]# Centre Val de Loire
lon=[2.352222, 4.472525, 2.528073, 0.882833, 1.916502, -0.515749, 4.383721, 2.324468, 6.208093,
 7.441624, 6.022302, -0.329969,  -2.932644,  -0.309184,  -0.299579, 1.444209,  1.569602, 5.450282, 
 3.344854, 3.258363, 6.067919, 9.012893 ]
lat=[48.856614, 48.793409, 49.663613, 49.524641, 47.903791, 48.878847, 47.052505, 50.573277, 
 48.874423, 48.318179, 47.134321,47.763284, 48.202047,  45.903552, 44.700222, 43.604652, 
 45.893223,45.169580,45.703269,43.591236, 43.935169,42.039604 ]

regions=[u'R\xe9gion: '+r+'<br>lon: '+'{:.2f}'.format(lon[k])+'<br>lat: '+'{:.2f}'.format(lat[k])  for k,r in enumerate(regions)]

and plotted the points as a scattermapbox trace:

trace = dict(type='scattermapbox',
            lat= lat,
            lon=lon,
            mode='markers',
            text=regions,
            marker=dict(size=5, color='red'),
            showlegend=False,
            hoverinfo='text'
            )
5

But…in your map, the effect is hover on the point , not hover on the region…exactly :disappointed_relieved:
https://plot.ly/~empet/14398/shapes-and-lines-in-mapbox-via-geojson-data/#plot

I need the effect on the region and show the text whenever the mouse on it

6

Yes, you are right, but at the moment this is the unique possibility to display some information on hover within a region.

7

I think I can use dash to interaction with mouse … it can obtain the location of the mouse and check if the mouse is in the polygon :laughing:

1 Like
8

Are there any plans to add hovering over a region instead of having to hover over the point? This seems like a big limitation