Folium Style_Function Parameters – Explanation

foliumleafletpythonstyle

I'm trying to do a uniform style for each polygon, but I want to know further about what I can do with Python library Folium Style_function. What can I put in the style variable? Where are the resources that I can look up to?

style = {'fillColor': '#f5f5f5', 'lineColor': '#ffffbf'}    
polygon = folium.GeoJson(gjson, style_function = lambda x: style).add_to(m)

I know that the style variable should be a dictionary, and I looked at the documentation. It seems like every resource that I have encountered has been trivial from other topics.

Best Answer

The Geojson layer's style_function mimics the style function from Leaflet.js. Here are all the parameters.

Related Solutions

[GIS] Styling different shapes in layers – Openlayers-3

You're not looking at the right place. OpenLayers 3 (latest version) API docs are at http://openlayers.org/en/v3.9.0/apidoc/. It is, by the way, an excellent documentation.

You will use text field (top-left) to search for everything available in the library.

A ol.geom.Polygon can't be styled. You will apply a style to the feature that holds polygon.

Look at ol.style.Style. There are 4 possibilities:

ol.style.Fill;
ol.style.Image;
ol.style.Stroke;
ol.style.Text;

So you can style a polygon like:

var style = new ol.style.Style({
    stroke: new ol.style.Stroke({
        color: '#b30734',
        width: 3
    }),
    fill: new ol.style.Fill({
        color: [51, 51, 51, .7]
    })
});

var feature = new ol.Feature(
    new ol.geom.Polygon([[[-2e6, -1e6], [-1e6, 1e6],
            [0, -1e6], [-2e6, -1e6]]])
);
feature.setStyle(style);

A demo.

[GIS] Coordinate System Mismatch In Folium

There are several things you have to take into account when dealing with coordinates and coordinate systems in Leaflet.

First, regardless of the coordinate system of the actual map displayed, all coordinates passed to Leaflet functions/methods are always EPSG:4326.

Second, order of coordinates passed to Leaflet is [latitude, longitude]. Since in your first attempt you used reversed coordinate order, you ended in Syria instead of Turkey.

And third, when defining/creating map with folium.Map call, actual crs of map has to be specified. Since your map is in EPSG:3857, your second attempt was completely off.

Best Answer

Related Solutions

[GIS] Styling different shapes in layers – Openlayers-3

[GIS] Coordinate System Mismatch In Folium

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