[Talk-GB] FW: State of play of OS Vector data

[Micah]

On Sunday 09 May 2010 19:16:41 Seventy 7 wrote:

> When streetview came out last month there was talk about not rushing to
>  trace buildings but from what I've read this doesn't seem to be the case
>  any more.
> 
> Is streetview the best building level detail we have from the OS? There is
>  no aerial photography where I am.

Mastermap is the best building level detail Ordnance Survey offer but OSM 
can't use it. So Ordnance Survey Street View is best from them OSM can trace 
for buildings. 

I just looked at the OS Vector District tiles in QGIS ( http://www.qgis.org/ ) 
and found that they have added noise with often curious artifacts to the 
buildings to fill in a little up to the roads often, and within blocks of 
buildings . So ok for looking at lower scalesto give the built up area but not 
represent reality of individual buildings (and speces) on ground at higher 
scales. OS Street View seems a bit better.

I may put up some side by side screenshot examples on my blog some time, 

The water features and woodlands in OS Vector District on other hand seem good 
to go, comparing very well with what I know on the ground and I am for 
importing them, after a little clean up, at least on tile by tile basis or 
feature by feature with a little local vetting. But I notice some tiles have 
some water features as per Street View and other tiles have are missing 
similar ones present elsewhere.
Tide lines look pretty good, matching up well with GPS track I took of path 
that followed tile line, and off shore islands and costal features look pretty 
good.

I am still getting to grips with QGIS have yet to work out how to convert once 
identified area I want to using Open Street Map. But I am in no great rush. I 
only want to mess about with small areas of specific features I have some 
direct knowleage of.

cheers,

Micah

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