Ok ...progress on multipolygon errors
These are are now down (152 file size) to mostly large things .. like
relations for boundaries of the states, Australia ...
I don't see anything wrong with them .. other than very long ways,
and I think that may be the problem with these being rendered as the
program maybe limited in some way.
OSMinspector might be reporting these as 'geometry errors'.
I think I might try selecting one of these 'errors' and separating a
reported faulty way up into smaller segments .. and see what happens,
if that way is also reported by OSMinspector as a long way.
What of the others?
They won't effect the display of the map too much .. but they will
effect the routing.
The ones that can be 'fixed' with armchair imagery mapping are the
roundabouts.
Possibly barrier in NSW using the LPI base Map - that does show gates as
an hourglass shape.
There maybe some that can be fixed just using the OSM data ..
for instance a section of one way road that should be connected to its
partner opposing one way road and isn't.
On 01-Apr-17 02:16 PM, Warin wrote:
The tools for finding map errors are one way of finding some map errors.
Additionally I am looking at rendering errors and gradually 'fixing'
them.
As a comparison I have used the errors reported on
http://alternativaslibres.org/en/downloads.php for the UK and OZ as;
these are updated daily so I can track progress.
the completion between OZ and UK can be an incentive to get 'our'
errors down.
Yes the UK is a smaller size, but they have a greater population, and
they therefore should have a greater number of things mapped.
Anyway here it is.
File sizes in kbytes
Error type OZ file size UK file size
Turn restrictions 179 480
Roundabouts 1015 130
One Way roads 193 415
Multiplygons 172 1,200
Motorway exits 18 30
House Numbers 605 5,600
Flares 173 188
Barriers 29 153
Arcs 4,000 25,000
Doing well over all .. my experience with them;
roundabouts are not doing well,
there is a tendency to have 2 roads join the roundabout at the same
place ... and that generates an error.
The separate roads should join the roundabout at different places.
Tiresome to fix as it makes little difference to the map, should make
a difference to voice routing.
Multipolygons have gone down from 240 to 172 so far, I have been
tackling them.
Mostly ways inner and outer sharing nodes, some crossing ways.
Makes a difference to map rendering.
Turn restrictions .. only a few samples by me so far .. but they look
to have some members deleted.
It would be handy to have names on these to say what they were .. e.g.
no right turn from Macquarie St to Bridge Rd.
That would make restoration and checking much easier. I have deleted
some that never made sense. Others I have left messages for.
Makes a difference to routing.
One way roads .. again only a few samples.
But they look to be roads that have no connection - so there must be a
large collection of vehicles at the .. or it never gets used. :)
Makes a difference to routing.
Barriers ... again only a few samples.
These seem to be a barrier (gate) that is on more than one road ..
say where 2 roads cross at right angles and the node where they cross
is a gate ... must be a strange gate :)
Makes a difference to routing.
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