compute_view not working

[giswqs]

Context

I am trying to use to the compute_view method to get the latitude, longitude, and zoom level of the layer so that the map can automatically zoom to the area of interest. It used to work, but not any more. It throws the following error:

AttributeError: 'pyarrow.lib.ChunkedArray' object has no attribute '_bbox'

Code

import geopandas as gpd
from lonboard import Map, SolidPolygonLayer
from lonboard._viewport import compute_view

gdf = gpd.read_file(gpd.datasets.get_path('naturalearth_lowres'))

layer = SolidPolygonLayer.from_geopandas(
    gdf,
    get_fill_color=[255, 0, 0],
)

compute_view(layer.table)

Error

[kylebarron]

I mean... you're using a private method. No attempt for backwards compatibility is made for private methods.

[giswqs]

Understood. What is the recommended way of getting the center and zoom level of a layer so that the map can zoom to the layer programmatically?

[kylebarron]

The simple answer is that there isn't a public API for this because lonboard expects to be able to auto-center once when the user creates a map. We don't try to support auto-zooming for new layers because that's an open question: to what extent should it zoom to the new layer, even if it's at a completely different location than the previous layer.

We have some heuristics internally, but those heuristics are not stable enough to be exposed publicly as standalone functions IMO.

The table attribute of any layer that subclasses from BaseArrowLayer is public; that will always be a GeoArrow table object. For the forseeable future that will always be a pyarrow.Table. You can rely on those public attributes

[kylebarron]

I'm going to close this because this is expected behavior. At some point in the future, maybe
more internals will be made public, but for now I'm focusing on the stability of the end-user