I've now had a few days to contemplate the Nottingham & Notts NaPTAN data, so I
thought I'd write
quick summary of what I've been doing. Feedback and suggestions all most
welcome.
* Use the data to name noname roads. I managed to resolve quite a
number of unnamed road issues thanks to the detail in the data. Using ITO's OSM
Mapper I've saved an image of the changes made based on this information:
http://wiki.openstreetmap.org/wiki/Image:Nottingham_NaPTAN_derived_road_names.jpg
* Add major missing roads. Alignment of bus-stops have also allowed a
much smaller number of roads to be added. Being able to add these roads, which
of course will all need surveying, makes planning future surveys using only OSM
sourced data much easier. I use main roads for survey area boundaries, but they
are also very useful for estimating survey complexity (which even OSGB 1:25000
aren't much use).
* I've merged very few bus stops as yet, just a few which I've happened
to pass. Overall impression is that the stops in the city of Nottingham are
accurately located. Some of the differences may be between boarding point and
the flag location (I always try and take this). All stops which I encounter
which are not already on OSM, where my GPS reading is close will just be tagged
as verified, and source=naptan_import;survey.
* Details like indicator & shelter will not always be available
immediately a bus stop is verified. Today I passed a whole slew which I
waypointed, but I'd run out of convenient bits of paper and space on the
dictaphone. I'd rather revisit these than try and guess which had
shelters/indicators.
* Quite a few stops don't have indicators, but the infrastructure is
being installed. I propose to tag these electronic_indicator=installation.
* One stop does not appear to exist on the ground: Charlbury Road (
http://osm.org/go/eu8ZC@@J9-- ). A bus does seem to run along this road, but I
suspect it is a hail-and-ride sector.
* Trams. I have been re-tagging tram stops to railway=tram_stop and
changing name to reflect signage at the stop (usually this means removing "Tram
Stop") from the name. As there is a stop for each direction, incorporating the
NaPTAN stuff for the NET-1 (Nottingham Tram) will take quite a lot of work.
Most of this needs to be done: the single node on the track did not allow
adequate representation of pedestrian access, particularly to island platforms.
I am proceeding to rework tram stops in Basford which are not on a road. I am
just creating two ways adjacent to the tram stop. One tram stop, Cinderhill,
has two stop points, but it has a single platform for up and down direction
trams, and a single track. This seems wrong, but I am open to correction:
particularly if the data model enforces such a difference.
* Stop Points. Many stops belong to multiple stop points (presumably
part of a hierarchical arrangement), but some of these seem to have little
utility. For instance, stops BA82 and BA05 located at the junction of Vernon
and Nottingham Roads, belong to stop areas 339GBA09, 339GBA10 and 339GBA24. The
latter seems far too far away and is probably an error, but there seem to be
large numbers of overlapping stop areas, which to me as a passenger do not seem
logical. I'll look into this more once OPNV has rendered the data.Thanks to all
who made this possible.
Jerry Clough
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