Rendering Scatter.Mapbox with datashader and then want to to plot the corresponding legend by adding a trace with a colorbar

Dash Python
1

I am struggling to get the labels for categories to show up on my manually created legend from a Scatter.Mapbox trace with a colorbar. If you see the image below, you will notice that the bar is rendering correctly, but that is not rendering the labels for some reason.

image
image1030×380 48.6 KB

Here is my code:

        color_vals = ["#DAE3F3","#8FAADC","#4472C4","#ED7D31","#F4B183","#FBE5D6","#FF0000"]
        color_names =  ['cat1', 'cat2', 'cat3', 'cat4', 'cat5', 'cat6', 'cat7']
        num_colors = len(color_vals)
        colorscale=[
        [0, "#DAE3F3"],  # Cat1
        [0.14286, "#DAE3F3"],
        [0.14286, "#8FAADC"],  # Cat2
        [0.28571, "#8FAADC"],
        [0.28571, "#4472C4"],  # Cat3
        [0.42857, "#4472C4"],
        [0.42857, "#ED7D31"],  # Cat4
        [0.57143, "#ED7D31"],
        [0.57143, "#F4B183"],  # Cat5
        [0.71429, "#F4B183"],
        [0.71429, "#FBE5D6"],  # Cat6
        [0.85714, "#FBE5D6"],
        [0.85714, "#FF0000"],  # Cat7
        [1, "#FF0000"]]
        cmin = .5
        cmax = num_colors + cmin
        category_colors = {
        'cat1': "#DAE3F3",
        'cat2: "#8FAADC",
        'cat3': "#4472C4",
        'cat4: "#ED7D31",
        'cat5': "#F4B183",
        'cat6': "#FBE5D6",
        'cat7: "#FF0000",
        }


        cvs = ds.Canvas(plot_width=4000, plot_height=4000)
        agg2 = cvs.polygons(bg_stats3, geometry='geometry', agg=ds.by(selected_variable, ds.any()))
        agg = cvs.polygons(bg_stats2, geometry='geometry', agg=ds.by(selected_variable, ds.any()))
        img = tf.shade(agg2, color_key=category_colors, how='eq_hist')[::-1].to_pil()
        coords_lat, coords_lon = agg.coords["y"].values, agg.coords["x"].values
        coordinates = [
            [coords_lon[0], coords_lat[0]],
            [coords_lon[-1], coords_lat[0]],
            [coords_lon[-1], coords_lat[-1]],
            [coords_lon[0], coords_lat[-1]],
            ]
        

        fig = go.Figure(go.Scattermapbox())
        fig.update_layout(
            mapbox_style='carto-positron',
            mapbox_layers=[
                {
                    "sourcetype": "image",
                    "source": img,
                    "coordinates": coordinates
                }
            ]
        )

        color_scale_legend = go.Scattermapbox(
            lat = [0],
            lon = [0],
            mode='markers',
            marker=dict(
                size=0,
                color=[cmin, cmax],
                colorscale=colorscale,
                showscale=True,
                colorbar=dict(
                    title=selected_variable,
                    x=0.95,
                    y=0.5,
                    len=0.6,
                    tickmode='array',
                    tickvals=color_vals,
                    ticktext=color_names,
                    thickness=20,
                    tickcolor='black',
                    tickfont=dict(color='black')
                )
            )
        )
        fig.add_trace(color_scale_legend)