OpenStreetMap

Little Brother's diary

Recent diary entries

That blade of grass is coming back to haunt us.

Posted by Little Brother on 19 July 2017 in English (English)

Remember that comment about the map being first finished when every blade of grass has been documented. Of course it was only meant to be figurative but some contributors do go to extraordinary extremes to map useless data.

Using OSMI I found this:

http://tools.geofabrik.de/osmi/?view=geometry&lon=6.96155&lat=51.66477&zoom=18&opacity=0.53&overlays=self_intersection_ways,self_intersection_points

When downloaded these ways are are tagged as barrier=line

They are the ground white lines of a tennis court: An entry from a contributor which has over 4,000 changesets to his/her credit. I know that there are no fixed set of attributes so what this contributor has done is within OSM rules but I think such data is redundant as they will never be rendered. But maybe this contributor is writing his own renderer.

So what's my problem: Well, it is that the data is not being entered without mistakes which the validation applications find. If not corrected then the users who try to clean-up the data base will be continually linked to these errors which is of course a waste of resources.

Basically it comes down to the fact that many POIs can be well enough documented with a single node or area with the applicable attributes. It would then be easier for everybody.

I don't like to delete the work of others but it give little pleasure to see redundant data like detailed water slides, etc where a single node would do the job better.

OSM: Why can't contributors check/correct their own work!

Posted by Little Brother on 17 July 2017 in English (English)

Just take a look at this:

http://tools.geofabrik.de/osmi/?view=geometry&lon=3.44678&lat=48.05899&zoom=6&overlays=self_intersection_ways,self_intersection_points

and ask yourself: Do I check my own work?

OSMI is just one of the many very good tools available: Why don't more contributors use these tools?

Here is another view:

http://tools.geofabrik.de/osmi/?view=geometry&lon=4.30371&lat=49.27784&zoom=6&overlays=single_node_in_way,duplicate_node_in_way

and this one shows unconnected ways which lead to routing errors:

http://tools.geofabrik.de/osmi/?view=routing&lon=4.30371&lat=49.27784&zoom=6

and there are plenty more views. Have a look and do some cleaning, please!

Just for fun but a waste of time

Posted by Little Brother on 24 October 2014 in English (English)

For fun I mapped a desert hamlet in Pakistan that nobody will probably ever see or need to use. Surely that is a waste of time!

Link:

http://demo.f4map.com/#lat=24.8662633&lon=70.4326434&zoom=20&camera.theta=66.772&camera.phi=4.011

I know the object attributes are just assumptions.

Please feel free to correct if you can do it better.

PS: Check the BING satellite picture.