Sep 25th, 2020
Version 0.4 marks the first of our expected monthly Daylight releases through the end of 2020. With this release, we are including new coastline data, updated Microsoft ML Building Footprints data, and for the first time we’re including data about specific features we’ve excluded from a Daylight release.
📥 Download Daylight Map Distribution right now in OpenStreetMap PBF format: 📦 planet-v0.4.osm.pbf (59.5GB).
Coastlines in OpenStreetMap are challenging for map rendering, and typically come from a coastline rendering program that converts worldwide ways with
natural=coastline tags into closed land/sea polygons and coastal linestrings.
The main problem of showing coastlines from OSM data is that many renderers really need closed polygons. The polygon can (and normally should) be made of several ways, but the ways should join end-to-end and eventually loop back round without interruption, to close the polygon. An imperfect coastline with many small gaps, reversed ways and other defects will cause the polygon to break, and the coastline to be rendered incorrectly. – OSM wiki
Like a lot of OSM users, we reach for the results of the excellent OSMCoastline tool. We wanted to be sure that our maps looked visually consistent, with coastlines generated from the same underlying OSM data that defined roads and buildings. Software engineer Yinxiao Li contributed a fix to OSMCoastline earlier in the summer that’s enabled us to generate coastline shapefiles consistent with other basemap elements. We’re now publishing that coastline data alongside Daylight starting with land polygons.
📥 Download OSM coastlines in Shapefile format: 📦 daylight-v0.4-coastline-land-polygons.tgz (713MB)
We’ve continued our collaboration with the Microsoft Building Footprints project on an extension to Daylight. Larry Freil at Microsoft previously posted a detailed exploration of this data, including suggestions for how to apply buildings data to Daylight for rendering OpenStreetMap with Mapnik. Microsoft provides the building footprint data under the Open Data Commons Open Database License (ODbL).
Users often ask questions about what features we’re specifically filtering for publication with Daylight. As we’ve evolved our process over the past months, we’ve made it easier to share details about our work on the data. For v0.4, we:
Analyst Charmaine Bonifacio assembled all the issues we found when constructing v0.4 into a single data file, Daylight v0.4 Flagged and Fixed Features.csv.
Represented the Rio Huallaga river area more accurately:
Added northern half of Sevier Lake:
Improved this lake geometry:
Found missing water body in Florida:
Fixed the relation of Long Draw Reservoir in Colorado:
Fixed this wetland geometry:
Modified these two office areas that accidentally had building tags to cover the whole area:
Relation building fixed:
If you have any questions about this data distribution, we have created a #daylightdistro_feedback Slack channel in OSM US. Members of the team will be there periodically to answer questions. You can also email the team at firstname.lastname@example.org.