{"version":"1.0","type":"rich","title":"HOLC 1939","description":"An interactive Mapbox GL map displays two overlaid raster layers of Home Owners' Loan Corporation (HOLC) maps from 1939, centered on Los Angeles and Watts. Two sliders control the opacity of each raster layer, allowing side-by-side comparison of the historical redlining districts. Clicking on the map reveals popups with the district type and name from the GeoJSON layers. The map uses Mapbox GL JS v0.44.1 with custom raster sources and built-in popup functionality.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-ffeebb3d34b8b09219ddd4337574e72f?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}