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    Re: An essay about maps
    From: Tom Sult
    Date: 2010 Nov 14, 10:18 -0600

    Just before I got this message I was going to write... "We need a
    Wikki maps initiative."  Great minds think alike.  Crowd sourcing has
    powerful implications.
    Thomas A. Sult, MD
    3rd Opinion
    1415 First First St. South #5
    Willmar, MN 56201
    320 235 2101 Office
    www.3rdOpinion.us
    tsult---.com
    
    
    
    
    
    
    On Nov 14, 2010, at 10:07 AM, Richard B. Langley wrote:
    
    > One way to update maps, at least electronically, is though
    > volunteered geographic information--getting the public to supply
    > updates. Issues related to this activity are reviewed in this paper:
    > .
    > -- Richard Langley
    >
    > Quoting Apache Runner :
    >
    >> Peter -
    >>
    >> This is all preaching to the choir, I suppose.  Most folks on this
    >> list
    >> probably know how far one can trust a map, but I do appreciate you
    >> sending
    >> around the column that woman wrote.
    >>
    >> I might add an addendum to the various thoughts, and even a
    >> response to her
    >> essay that I suppose will never reach her, but it's something like
    >> this:
    >>
    >> Consider what it takes to create a map.   You have to start with a
    >> well-surveyed control network.   In the modern era, you lay on top
    >> of that
    >> aerial stereo photographs to get the major topographic features.
    >> Then you
    >> have whatever local knowledge you can put on top of that to extract
    >> paths
    >> that may be hidden from view in the aerial photographs.
    >> Presumably paved
    >> roads have blueprints that lay out their path relative to the control
    >> network.   All of this is a lot of work.   I know some land
    >> surveyors and
    >> they'll tell you how difficult it is to find some markers on the
    >> secondary
    >> control networks.   Sometimes, it's a half buried bottle hidden by
    >> a bush.
    >> In the particular case of the missing dirt track, washouts happen
    >> all the
    >> time, and some aspects of the landscape change far faster than
    >> surveyors and
    >> cartographers can keep up with it.
    >>
    >> All of these are good reasons to consult the date of creation of
    >> the map and
    >> the revision history.
    >>
    >> Now that I think about it, I have to grab some maps myself.   Has
    >> anyone on
    >> this list been to Rollright?   Know anything about astronomical
    >> alignments
    >> of it (or lack thereof?).   I'm visiting there in a couple of weeks
    >> and am
    >> trying to sort through the literature.   Talk about reverse
    >> engineering -
    >> going back 10 years is one thing, but 4500 is quite another.
    >>
    >> John H.
    >>
    >>
    >>
    >>
    >> On Sun, Nov 14, 2010 at 4:39 AM, Jackie Ferrari
    >> wrote:
    >>
    >>> I have used them extensively hiking around the Highlands of
    >>> Scotland.
    >>> Once looking for a particular forest in which to camp, I was
    >>> convinced my
    >>> navigation was wrong as I could see no forest where my 1:50000
    >>> Ordnance map
    >>> told me it should be. Nonetheless I kept on the path(a sheep
    >>> track) and lo
    >>> and behold ,there it was. A plantation of 6 inch high conifers.
    >>> However on occasion, forest tracks marked on the map are no longer
    >>> there,
    >>> but these have always been man made tracks, made by bulldozers for
    >>> clearance. It seems the sheep tracks are more 'permanent.' !
    >>>
    >>> Jackie.
    >>>
    >>> ----- Original Message -----
    >>> *From:* Apache Runner 
    >>> *To:* NavList@fer3.com
    >>> *Sent:* Sunday, November 14, 2010 4:07 AM
    >>> *Subject:* [NavList] Re: An essay about maps
    >>>
    >>> Certainly, the USGS topo's are far out of date with respect to
    >>> tracks -
    >>> hiking and passable 4-wheel-drive routes.  I've found too many out
    >>> of date
    >>> instances to recount.
    >>>
    >>> On Sat, Nov 13, 2010 at 6:00 PM, Fred Hebard  wrote:
    >>>
    >>>> Are the British Ordnance Survey maps really as accurate as she
    >>>> claims?
    >>>> I've never seen a high resolution (<= 30') map that was 100%
    >>>> accurate,
    >>>> where I had knowledge enough of the terrain to detect the errors.
    >>>>
    >>>> It was rather a nice read, thanks for sharing it.
    >>>>
    >>>>
    >>>> On Nov 13, 2010, at 4:43 PM, Peter Fogg wrote:
    >>>>
    >>>> An essay for those interested in maps:
    >>>>>
    >>>>> http://www.smh.com.au/opinion/society-and-culture/road-to-nowhere-20101112-17r37.html
    >>>>>
    >>>>> You can tell the good lady is from the Big Smoke.  If she'd
    >>>>> spent more
    >>>>> time in remote places she'd have known that when you get to a
    >>>>> place like
    >>>>> Hungerford you don't just drive through it.  You stop and, first
    >>>>> of all,
    >>>>> take on fuel.  Even if your tanks are near-full - whether you'll
    >>>>> find any
    >>>>> more further on is never guaranteed, and the person selling fuel
    >>>>> is
    >>>>> potentially a good source of information about what lies ahead.
    >>>>> Then you
    >>>>> visit the pub.  If the place is a stepping-off point to really
    >>>>> remote places
    >>>>> you're also expected to register with the cops.  Its just common
    >>>>> sense
    >>>>> really, but you can expect to be quizzed about how well-prepared
    >>>>> you might
    >>>>> be for the next leg, including your mapping resources.
    >>>>>
    >>>>> As you drive out from the relatively well-populated coast into the
    >>>>> relatively bereft-of-people interior, you go from ignoring other
    >>>>> motorists
    >>>>> to acknowledging them.  Then when you get further out, if
    >>>>> another vehicle
    >>>>> approaches from the direction you're going then you both stop -
    >>>>> blocking the
    >>>>> road, but that's rarely a problem - so the drivers can have a
    >>>>> leisurely
    >>>>> chat, driver's window to driver's window, elbow to elbow, about
    >>>>> the weather
    >>>>> and the price of ewes and, what interests you most, what's ahead.
    >>>>>
    >>>>> In two words: local knowledge.  The good lady is dreaming with her
    >>>>> whimsical insistence on mapping accuracy.  As if there was such
    >>>>> a thing.
    >>>>>
    >>>>
    >>>>
    >>>>
    >>>>
    >>>>
    >>>
    >>>
    >>> --
    >>> Keeping up with the grind
    >>>
    >>>
    >>
    >>
    >> --
    >> Keeping up with the grind
    >>
    >
    >
    >
    > =
    > =
    > =
    > =
    > =
    > =
    > =
    > =
    > =
    > ======================================================================
    > Richard B. Langley                            E-mail: lang---.ca
    > Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/
    > Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506
    > 453-5142
    > University of New Brunswick                   Fax:      +1 506
    > 453-4943
    > Fredericton, N.B., Canada  E3B 5A3
    >     Fredericton?  Where's that?  See: http://www.city.fredericton.nb.ca/
    > =
    > =
    > =
    > =
    > =
    > =
    > =
    > =
    > =
    > ======================================================================
    >
    >
    >
    >
    >
    >
    
    
    
    
    

       
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