pages/00_leafmap.py

import leafmap
import solara
import geopandas as gpd

# external script defines polygons, etc
#from fire import *

nps = gpd.read_file("/vsicurl/https://huggingface.co/datasets/cboettig/biodiversity/resolve/main/data/NPS.gdb")
calfire = gpd.read_file("/vsicurl/https://huggingface.co/datasets/cboettig/biodiversity/resolve/main/data/fire22_1.gdb",  layer = "firep22_1")
# fire = gpd.read_file("/vsizip/vsicurl/https://edcintl.cr.usgs.gov/downloads/sciweb1/shared/MTBS_Fire/data/composite_data/burned_area_extent_shapefile/mtbs_perimeter_data.zip"

# extract and reproject the Joshua Tree NP Polygon
jtree = nps[nps.PARKNAME == "Joshua Tree"].to_crs(calfire.crs)

# All Fires in the DB that intersect the Park
jtree_fires = jtree.overlay(calfire, how="intersection")

# Extract a polygon if interest.   > 2015 for Sentinel, otherwise we can use LandSat
recent = jtree_fires[jtree_fires.YEAR_ > "2015"]
big = recent[recent.Shape_Area == recent.Shape_Area.max()].to_crs("EPSG:4326")



zoom = solara.reactive(14)
center = solara.reactive((34, -116))

# location of cached COGs
before_url = "https://huggingface.co/datasets/cboettig/solara-data/resolve/main/before.tif"
after_url = "https://huggingface.co/datasets/cboettig/solara-data/resolve/main/after.tif"

# custom polygon appearance
style = {
    "stroke": False,
    "fill": True,
    "fillColor": "#ff6666",
    "fillOpacity": 0.5,
}

class Map(leafmap.Map):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        # Add what you want below
        self.add_gdf(jtree_fires, "All Fires", )
        self.add_gdf(big, big.FIRE_NAME.item())
        self.split_map(before_url, after_url, 
                       left_label = "NBS before fire",
                       right_label = "NBS after fire")


@solara.component
def Page():
    with solara.Column(style={"min-width": "500px"}):
        # solara components support reactive variables
        # solara.SliderInt(label="Zoom level", value=zoom, min=1, max=20)
        # using 3rd party widget library require wiring up the events manually
        # using zoom.value and zoom.set
        Map.element(  # type: ignore
            zoom=zoom.value,
            on_zoom=zoom.set,
            center=center.value,
            on_center=center.set,
            scroll_wheel_zoom=True,
            toolbar_ctrl=False,
            data_ctrl=False,
            height="780px",
        )
        solara.Text(f"Zoom: {zoom.value}")
        solara.Text(f"Center: {center.value}")