viz.create_html() rounds lat/lng to 4 decimal places which drops accuracy to 11m

[aidanlister]

This is the difference between this:

And this:

This is happening here:

mapboxgl-jupyter/mapboxgl/viz.py

Line 281 in 9a15a07

geojson_data=json.dumps(self.data, ensure_ascii=False),

I'm attempting to solve this by passing in a decimal rather than a float when building my FeatureCollection:

    features.append(Feature(
        geometry=Point((Decimal(m['lng']), Decimal(m['lat']))),
    ))

You can monkey patch this like this:

import json
import decimal

class FullJSONEncoder(json.JSONEncoder):
    def default(self, o):
        if isinstance(o, decimal.Decimal):
            return str(o)
        return super().default(o)

default_props = {'cls': FullJSONEncoder, 'skipkeys': False, 'check_circular': False, 'allow_nan': False, 'indent': False, 'separators': None, 'default': None, 'sort_keys': False, 'ensure_ascii': False}
with patch.object(json.dumps, '__kwdefaults__', default_props):
    ...