blogs.openstreetmap.org

Lately I've been working on merging my county's park data into OSM using JOSM (this is more technically known as conflation). I've also been modifying JOSM and some plugins to try and improve the efficiency with which I do this, considering the county has 22,500 acres of parkland in 416 parks, not counting the parks which the county does not operate, but for which the county still has boundary data. I thought I'd share my process so far, in hopes that others with similar tasks might find some useful tips, and perhaps learn how others accomplish similar tasks or how I might be able to improve my process. Be sure to at least have the utilsplugin2 plugin installed.

First of all, I converted the government-provided (and appropriately licensed) Shapefile to an OSM.XML file using ogr2osm and a simple translation script to set the name, operator, and leisure=park tags.

1. Create new layer (blank)
   


2. Open government OSM file
   


3. Select and zoom to a feature to merge (click and press 3)
   


4. Merge feature to OSM layer (Ctrl+Shift+M) and delete (D) from government layer
   


5. Switch to OSM layer (Shift+A, then 1)
   


6. Download corresponding area from OSM database (Ctrl+Shift+D)
   


7. The next step will vary:
   
   
   • If the feature doesn't exist in OSM yet, then you're done
     
   
   
   • If the government feature is of higher spatial accuracy, select the two features and run Replace Geometry (Ctrl+Alt+G), resolving any tag/membership conflicts
     
   
   
   • If the government feature doesn't have better spatial accuracy, but has better tags, copy and paste them (Ctrl+C on the government feature then Ctrl+Shift+V on the OSM feature), then delete the government feature
   
   
   
   


8. Switch back to the government layer (Shift+A, then 2)
   


9. Repeat with next feature, go to step 3
   

Note that the Replace Geometry action can "upgrade" a node to a way or to a relation, or replace a way with a way. It can't yet "upgrade" a way to a relation or replace a relation with a relation, but those are on my TODO list.

One obvious way to improve this include downloading a large area at once, though this may be problematic if the features are spread over a very large area. I really should get back to working on the conflation plugin I started almost a year ago, but got stuck on the design.

How many others are doing this kind of merging? Any suggestions?

Good Day from Temecula, California!

A few weeks ago, I stumbled across the Night of the Living Maps Project:
http://wiki.openstreetmap.org/wiki/Night_of_the_living_maps

If anybody's thinking about jumping aboard an all nighter on OSM on Tuesday night, here's what approximately 8 mapping hours worth of JOSM Bing traces would look like in the open country for a single mapper (the area started off with TIGER and GNIS data):

http://www.openstreetmap.org/?lat=33.5693&lon=-116.9703&zoom=14&layers=M

Sorry folks, this Temecula mapper can't be a zombie during the week...gotta work! But I've gave this countryside area east of Temecula nearly 8 hours of attention during last several days in dedication to Night of the Living Maps and plan to finish the rest of the Benton Road segment soon. Have fun on Tuesday!

Will be back in town wrapping up the detailed mapping of Temecula's Pechanga Parkway corridor once Benton Road is done.

Tip: Make sure you have an updated JOSM version with the 'F'-key shortcut feature which will make connecting the nodes of all of those natural areas much faster.

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Вчера встала проблема переконвертировать данные из Шейпа в ОSМ. JOSM напрямую хавать шейп не захотел. Выход: Затянул шейп в Оззи Эксплорер из Озии опять экспорт в GPX формат а из него уже в ДЖОСМ.

My goals are to update and correct the map of the Southern Peninsula of Cape Town which is a fairly high density tourist area.

Just around my own small suburb I have already done about 80 changes so this will be a long term project!

A questions:-
-I have found and removed about 10 "blank" nodes, is that OK?

正确位置

正确位置

He estado observando que en OSM, no hay logotipos para iglesias o sitios de culto de la cristiandad y cenotes (cierto tipo de lagunas). Ojalá alguien pueda crear los símbolos.

When rendering maps people coming from a traditional GIS background tend to use Mapserver rather than Mapnik. I don’t know the reason for this, but it is probably just because Mapserver is quite mature and has been around for a long time while Mapnik is still relatively new.

I also did quite a few things using Mapserver in the past but mostly in the WMS and raster data area.

One thing Mapserver can do is rendering based on data values rather than just by predefined rules, which could be quite useful for river widths and the like. This was not possible in Mapnik at least not in Mapnik versions < 2.0.

Mapserver is scriptable in a couple of languages (not just Python) and this is why it has been relatively easy coding a new backend for Tirex although Perl is not quite my favourite scripting language. Of course this new backend is heavily based on the existing WMS backend.

So why did I do this? Well, last week I just stumbled upon the nice Topomap project which Max Berger is doing and unfortunately he map is limited to a very small area.

Hopefully I will be able to provide a map of this style for a couple of other areas real soon now. I’m especially interested in islands with good hiking options, the so called Wanderinseln in German.

I just commited the changes to the Openstreetmap SVN-repository in the hope that it might be useful for others as well.

BTW, Max is using TileCache which I could probably use as well. Probably someone can enlighten me about the pros and cons of Tirex vs. TileCache.