Jean-Marc Liotier wrote:
Jean-Marc Liotier wrote:
Without the isolated clusters of buildings, how would you know that some
important
roads are missing ?
Visiting the village and walking around it?
Are we now reaching the crux of this discussion ? Do you believe that local
survey is a requirement for mapping ? I don't and I back my position with all
the places I have mapped without having visited them - I'm curious about what
criticism you'll express about the quality of my work.
There is a certain level of accuracy that can be achieved as an armchair mapper
and there is certainly a lot more detail that can be added world wide using just
the material currently available. I was very tempted to 'tidy up' one of the
French areas as an example and I may yet do that, but there is more than enough
work still to do in my local area. AND only local access allows me to correct
the mistakes in the 'official' data.
If the opposition to mapping with the assistance of cadastral data is grounded
in opposition to the principle of remote mapping, then we have a problem - and
maybe you should talk to everyone who uses some provider of orbital imagery in
the source tag.
I'd certainly appreciate it if the editors automatically added
'source:trace=xxx' where I'm using a particular background layer - heck I forget
to ADD the tag most of the time!
With regards data, one needs to know the limits of it's accuracy. I know that
some streetview data is 40 years old. I can even identify the map it originally
came from, so it has to be a judgement if I use it. The positional accuracy of
the cadastral data is what I am questioning. Either someone says 'this is our
reference' and we ignore the differences to other imagery, or it gets tidied up
and the obvious flaws such as extra diagonal lines are removed. I get the
impression that this is a process that should be happening but not everybody is
'complying', so something needs to be done to re-educate those mappers to the
'assistance' element over the 'just copy raw' activity?
--
Lester Caine - G8HFL
-----------------------------
Contact - http://lsces.co.uk/wiki/?page=contact
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Rainbow Digital Media - http://rainbowdigitalmedia.co.uk
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