azavea / osmesa

OSMesa is an OpenStreetMap processing stack based on GeoTrellis and Apache Spark
Apache License 2.0
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Histogram tiles are untenable at scale #151

Open jpolchlo opened 5 years ago

jpolchlo commented 5 years ago

As a consequence of #150, it is now known that the edit histogram tile approach doesn't scale well. After running on OSM, many large tiles were outputted. These are multimegabyte tiles, where the guidelines (referred to here, link to mapbox docs is broken) suggest (and possibly enforce) a 500kb file size limit. This may be leading to apparently broken demos where tiles exist, but are not being displayed.

It might be time for a ground-floor rethink of the representation of these histograms to allow for more parsimonious tiles.