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"""
Checkout https://awesome-panel.org/resources/lonboard_dashboard/
"""
# pip install panel colorcet ipywidgets_bokeh geopandas palettable lonboard
import colorcet as cc
import geopandas as gpd
from lonboard import Map, PathLayer
from lonboard.colormap import apply_continuous_cmap
from palettable.palette import Palette
import panel as pn
url = "https://naciscdn.org/naturalearth/10m/cultural/ne_10m_roads_north_america.zip"
path = "ne_10m_roads_north_america.zip"
try:
gdf = pn.state.as_cached(
"ne_10m_roads_north_america", gpd.read_file, filename=path, engine="pyogrio"
)
except:
gdf = pn.state.as_cached(
"ne_10m_roads_north_america", gpd.read_file, filename=url, engine="pyogrio"
)
state_options = sorted(state for state in gdf["state"].unique() if state)
def to_rgb(hex: str) -> list:
h = hex.strip("#")
return list(int(h[i : i + 2], 16) for i in (0, 2, 4))
def to_palette(cmap) -> Palette:
"""Returns the ColorCet colormap as a palettable Palette"""
colors = [to_rgb(item) for item in cmap]
return Palette(name="colorcet", map_type="colorcet", colors=colors)
def create_map(state="California", cmap=cc.fire, alpha=0.8):
palette = to_palette(cmap)
data = gdf[gdf["state"] == state]
layer = PathLayer.from_geopandas(data, width_min_pixels=0.8)
normalized_scale_rank = (data["scalerank"] - 3) / 9
layer.get_color = apply_continuous_cmap(normalized_scale_rank, palette, alpha=alpha)
map_ = Map(layers=[layer], _height=650)
return map_
description = """# lonboard
A Python library for **fast, interactive geospatial vector data visualization** in Jupyter (and Panel).
By utilizing new technologies like `GeoArrow` and `GeoParquet` in conjunction with GPU-based map rendering, lonboard aims to enable visualizing large geospatial datasets interactively through a simple interface."""
# THE PANEL APP
pn.extension("ipywidgets")
state = pn.widgets.Select(
value="California",
options=state_options,
width=150,
name="State",
sizing_mode="stretch_width",
)
cmap = pn.widgets.ColorMap(
value=cc.fire,
options=cc.palette,
ncols=3,
swatch_width=100,
name="cmap by Colorcet",
sizing_mode="stretch_width",
)
alpha = pn.widgets.FloatSlider(
value=0.8, start=0, end=1, name="Alpha", min_width=100, sizing_mode="stretch_width"
)
logo = pn.pane.Image(
"https://github.com/developmentseed/lonboard/raw/main/assets/dalle-lonboard.jpg"
)
def title(state):
return f"# North America Roads: {state}"
settings = pn.Column(state, cmap, alpha)
description = pn.Column(pn.pane.Markdown(description, margin=5), logo)
component = pn.Column(
pn.bind(title, state=state),
pn.panel(
pn.bind(create_map, state=state, cmap=cmap, alpha=alpha.param.value_throttled),
sizing_mode="stretch_both",
),
sizing_mode="stretch_both",
)
pn.template.FastListTemplate(
logo="https://panel.holoviz.org/_static/logo_horizontal_dark_theme.png",
title="Works with LonBoard",
main=[component],
sidebar=[description, settings],
).servable() |