Random plotting notes

[ajfriend]

notes

projections

• 4326 # wgs84 (for H3 compatibility)
  • H3 does not use wgs84/epsg4326, but it does use the "authalic radius" from that standard
  • lat/lng
• 3857 # web mercator (for plotting), but in meters!
• 2263 # new york (just what's used in the example below)

geoviews

• tile options: https://github.com/holoviz/geoviews/blob/main/geoviews/tile_sources.py
  • also this, but i don't see a good way to programatically get all the options: https://geoviews.org/gallery/matplotlib/tile_sources.html
• active tools: https://stackoverflow.com/questions/57767169/set-box-zoom-or-pan-or-wheel-zoom-as-default-in-using-holoviews-or-hvplot
• bokeh palettes: https://docs.bokeh.org/en/latest/docs/reference/palettes.html
• Bokeh "tap" tool seems to do something on this website, but i can't get the same functionality (isolating a single geometry) locally: https://geoviews.org/gallery/bokeh/new_york_boroughs.html

folium

• seems to be most popular, but they make you manually determine the center and zoom level!
  • too much work. geoviews does it automatically
  • https://geopandas.org/en/stable/gallery/polygon_plotting_with_folium.html

[ajfriend]

def show_geo(geo):
    """ Show something that implements __geo_interface__
    """
    import json
    from IPython.display import GeoJSON
    # json.loads(gj_str)
    geo = geo.__geo_interface__
    
    return GeoJSON(geo)

[ajfriend]

Interactive plots with geoviews: https://gist.github.com/ajfriend/016271d1f2f7ad0699a8e59895a4aeca