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<p class="MsoNormal">Some more views and observations <span style=""> </span>on the NaPTAN data import in Birmingham:</p>
<p class="MsoListParagraphCxSpFirst" style="text-indent: -18pt;"><span style=""><span style="">1.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span>It serves as a great QA on OSM data and shows
that in the City Centre where we have not been able to get decent GPS traces
more accuracy is needed so the potential of obtaining aerial photography is
great.</p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent: -18pt;"><span style=""><span style="">2.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><span style=""> </span>It’s a
great impetus to resurvey streets where earlier work (potentially inaccurate
from NPE tracing, older GPS devices, less points collected, <span style=""> </span>inexperience, not realising that roads have a
width greater than the rendered line so placing bus stops too close to the road
etc.) can be improved.</p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent: -18pt;"><span style=""><span style="">3.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span>It’s also a great impetus to improve practice on
surveying bus stops and be much more precise and comprehensive – also a
stimulus to edit all those old bus stops where we placed them as a node on the
way rather than to the side of ways which is our current practice.</p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent: -18pt;"><span style=""><span style="">4.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span>QA works both ways and our surveys should help
to improve NaPTAN data.</p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent: -18pt;"><span style=""><span style="">5.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span>As an exercise(excuse the pun!) I cycled from Acocks Green to
Moseley and back this morning along the No 1 bus route and surveyed 47 bus
stops each time standing at the pole(leaning against it – you can’t get closer
than that!) <span style=""> </span>or underneath the plate at a
shelter: <span style=""> </span>4 bus stops coincided within
3-4 m; 17 were “good enough” coinciding <8-10m. That’s approx 45%. The rest
were out by anything up to 90m or were just missing.</p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent: -18pt;"><span style=""><span style="">6.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span>I think either the pole where there is no
shelter or the bus stop plate at a shelter should be what we survey – that’s
where the identification of what we survey is located</p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent: -18pt;"><span style=""><span style="">7.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span>Where a physical stop on one side of the road
doubles up for one on the other side also – I think we’re OK by surveying and
tagging the physical one with Andy’s suggestion of a tag opposite=yes. The NaPTAN
untagged node on the other side can be left in place to indicate the<span style=""> </span>logical relationship.</p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent: -18pt;"><span style=""><span style="">8.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span>I like the idea of tagging where the bus stop is
set back in a “lay-by” from the road which might account for some NaPTAN nodes
being some distance from the road</p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent: -18pt;"><span style=""><span style="">9.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span>For our purposes “good enough” is probably
sufficient rather than precise positional detail – I’m of the view that as long
the bus stop has more or less the right relationships to its surroundings then
that’s OK.</p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent: -18pt;"><span style=""><span style="">10.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span>Surprised that there is no data for either the
closed Digbeth Coach Station which is being rebuilt or the temporary
replacement nearby. I thought we were importing off-street bus stops? Perhaps
the NaPTAN data doesn’t exist? </p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent: -18pt;"><span style=""><span style="">11.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span>Can’t find any nodes for<span style=""> </span>taxi ranks – not imported or doesn’t exist
for Birmingham or I’m not looking hard enough?</p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent: -18pt;"><span style=""><span style="">12.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span>For the few nodes where I’ve estimated the fit between
OSM and NaPTAN to be “good enough” I’ve merged the nodes deleting the
unverified tag and<span style=""> </span>editing source tag to
v=naptan_import;survey</p>
<p class="MsoListParagraphCxSpLast" style="text-indent: -18pt;"><span style=""><span style="">13.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span>Verifying the data is going to be a long, slow
process with a lot of resurveying needed.</p>