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Update roles/osm-vector-maps/README.md

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1. The main focus of a Map Pack remains Hi-Res Vector Map data from OpenStreetMap, for your selected "continent" — but Lo-Res vector map tiles (1.74GB .mbtiles) and Lo-Res satellite photos (932MB .mbtiles) are also included for the entire planet. Read more at: https://github.com/iiab/iiab/wiki/IIAB-Maps
2. Every Map Pack's OSM vector tile data (originally from 2017) was updated to [September 2019](https://archive.org/details/osm-vector-mbtiles).
3. The world view (planetwide OSM vector maps included with all Map Packs) increased zoom levels from 0-9 to 0-10 (1.74GB osm-planet_z0-z10_2019.mbtiles) so that city search is successful more of the time.
4. Multiple Map Packs can be downloaded/installed (one "continent" at a time). However this can waste disk space with duplicate data ("continent" bounding boxes have been designed to overlap on purpose, so that multiple Map Packs are rarely necessary!)
4. Multiple Map Packs can be downloaded/installed (one "continent" at a time). However this can waste disk space with duplicate data, and potentially cause rendering slowness in areas where Map Packs overlap ("continent" bounding boxes have been designed to overlap on purpose, so multiple Map Packs are rarely necessary!)
3. **Hi-Res Satellite Photos** can be downloaded/installed for any 100 x 100 km, 300 x 300 km, or 1000 x 1000 km square region (around any map point that you click!)
1. These new Hi-Res Satellite Photo Regions are "squares" with 4 additional levels of satellite photo zoom (i.e. zoom levels 10-13) giving you 16X the resolution (i.e. 19 x 19 m pixels) and 256X more photographic information density.