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php cli tool to prepare GRB geographical data from Belgium to (J)OSM consumable XML suited for semi-automated import
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README.md

gplv2/grb2osm

Tool to help import GRB data Belgium in OSM /

Installation

Make sure you have composer installed, and then run:

composer install

Usage

To get the shape file, you need to download those from GRB first, you need to select GrbGis (everything) and make sure to take the buffered ones (500m) and do NOT clip the set as this destroys all buildings that cross it. Download & unpack these files somewhere.

Download stekene area data

This package will need the shape files indirectly. You have to import with JOSM first and save as OSM xml. Make sure all the files from GRB are there e.g:

  • Gbg23096B500.dbf
  • Gbg23096B500.lyr
  • Gbg23096B500.prj
  • Gbg23096B500.shp
  • Gbg23096B500.shx
  • Gbg23096B500.WOR

Josm needs some of them to determine the coordinate system used. Just the shape file alone will not work. Open up the .shp file in JOSM, you should not see any import warnings when all files are in place.

And of course, the database files containing the addresses:

  • TblAdpAdr23096B500.dbf
  • TblGbgAdr23096B500.dbf
  • TblKnwAdr23096B500.dbf

This tool will accept multiple dbf files separated by a comma.-f TblAdpAdr23096B500.dbf,TblGbgAdr23096B500.dbf But it's not really usefull as there aren't any crossreferences between Gbg and other shape sources. This would however be usable once GRB's oidn references are present on OSM building but aren't addressed yet, those can be matched later on in 1 go.

Shape after import

save this to a file, for example saved_imported.osm.

This data still has original GRB tags, so we need to use the tool to

  1. Alter the existing tags
  2. Add some source tags
  3. Delete useless ones
  4. Match addresses from .dbf file

grb2osm

Ater importing the shape file, you need to save as OSM. Once you have this file, we will perform step 1,2,3 and 4 in one run.

./grb2osm.php -i examples/saved_imported.osm -f examples/TblGbgAdr23096B500.dbf -o exported.osm -d 3

Open the exported file in JOSM

Shape after import

In the screenshot you see the result of custom mapCSS colouring styles, visually comfirming me that the address data is present in tags JOSM understands. Now you have a source layer you can start migrating buildings from. You will need a few plugins/tools to do this:

How to migrate in a nutshell

Now you have this source data layer, you want to start downloading (Small) area's in JOSM from the target area. Don't work too big as you want to keep track of what's migrated. I do it like this:

  • validate the OSM layer before even beginning so you have an idea what's already wrong and not the importers fault.
  • make sure tags are ok. (change with search/replace functionality for example buildings (ways+relations) smaller than 15m2. Make them all shed's (this is 99% accurate). Unless there is GRB adressing data, then it's possibly not a 'shed'
  • work methodically, go to an area, download from OSM, switch to the GRB layer and do a search for type way having building key. ex. "building"=* type:way areasize:-15 , change them all to shed. Make sure you do this on the OSM layer in particular, the new layer is probably already ok but it doesn't hurt matching these before migrating
  • now do a search for all buildings (type way, make sure to skip relations, they are tricky to copy/paste between layers, some complex buildings will become relations, treat them differently) in view using inview search attribute.
  • now copy and delete these from the new layer, paste them in the OSM layer and save both files.
  • you now need to run the validator and correct crossing buildings, overlapping buildings. In general, now you'll spend much time using the validator as a tool.
  • merge buildings using replace geometry hotkey (standard CTRL+SHIFT+G , you want to remap this to a more 'closer combo')
  • fix the warnings first, then the errors. Most errors have automated fixes which will make you have to cleanup much more later on. So by experience, fixing the warnings will usually also fix the errors
  • give decent comments on the changesets, add GRB as a changeset source as well.

Notes

  • Adp is not fully implemented yet, I create building=garage1 and building=garage2 for some source tags that should actually be manually reviewed as it's not always possible to just import them. They are ingezonken garagetoegang and,verheven garagetoegang, which doesn't really have a OSM ready tagging equivalent.
  • Gbg addressing (and this tools intelligence) is not perfect.
  • For my very own building (which is = 2 GRB oidn's, 2 housenumbers and busnummers), grb isn't correct enough. It's assigning all busnumbers to all numbers, while there are 8 in the other side, only 4 on right side (of the full appartment complex). So it's too wide , Be careful to check existing addressing data in OSM. and don't overwrite those by replacing the geometry and merging the data without attention for detail. Hence, GRB addressing will try to avoid difficult ones. Usually AGiv/CRab does a better job on those and combining these in JOSM as layers helps a lot to understand situations.

Damstraat 100 bus4

  • When this tool purged plenty of ways, it's not removing the nodes however, so you might endup with a bunch of stray nodes (unattached and not tagged in fact), JOSM has a autofix for this, it's very easy to fix this inside JOSM so the tool doesn't bother deleting those.

  • relations need special care

Crossing building type relation

Questions?

Send me an email or fork this and fix it(or suggest a fix) on GitHub.

Made by

This tool is being developed by gplv2. Drop us a line

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