openmaptiles/UPDATE.md

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# Keep the vector tiles updated
Once you have imported OpenMapTiles you can also keep it up to date by importing the latest OSM changes and
regenerating the tables.
## Import
You can either keep the database up to date based on the daily OSM change feed
or import specific change files.
### Keep Database Updated
You can use the new imposm3 feature to keep the database updated (thanks to the [work by @stirringhalo](https://github.com/openmaptiles/openmaptiles/pull/131)). This will automatically download
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the OSM change feed and import it into the database.
After each run you should also have a list of tiles that have updated.
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```
make update-osm
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```
### Import Change File
Given you have a file `changes.osc.gz` in your import folder. Once you ran the import command you should also have a list of tiles that have updated.
```
make import-diff
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```
## Generate Changed Tiles
After the import has finished **imposm3** will store lists of tiles in text format in subfolders of the `diffdir`,
named for the date(s) on which the import took place (`YYYYMMDD`).
Copy and merge the files to `tiles.txt` in the import folder (`data`), either manually or with the following command, which also removes duplicate tiles so they are only generated once:
```
cd data && sort ./*/*.tiles | uniq > tiles.txt
```
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Now run the command to read the tilelist and write the vector tiles for it to a new MBTiles.
```
docker-compose run generate-changed-vectortiles
```