[OSM-talk] Contour lines

[Gregory]

On 13 April 2010 01:59, Steve Hill <steve at nexusuk.org> wrote:

> ...for tracing bodies of water - you need to walk the perimeter with a
> GPS...
>
I've always wanted to fix up a pole about 6-10ft with a secure GPS mount on
one end, and possibly a harness or neck strap to carry the other end on me.
Then walk along the side of a river/lake at a safe distance with my GPS
hovered above the line where the water meets the bank.

A similar idea entered my mind where I would have a kick stand on my bicycle
and a broom pole sticking up from the bike. I would stand the bike some
distance away from the corner of a building and note the GPS location of the
bike, record another location where my line of sight of the building corner
is obstructed by the broom pole from the bike. I repeat for a few more line
bike and sight positions. So at home I have pairs of points (bike and
view/sight) I draw lines between them and extend each line beyond it's point
(keeping the angles). Where the lines cross is the location of the building
corner. I also repeated all this for the other building corners (let's hope
it was a simple rectangle) and I have produced a good outline/positioning of
the building where perhaps I could not get up next to it (or it's height
created an urban canyon for my GPS).

Now a days I'm just thinking about possible data imports and when Yahoo!
will fly over that countryside industrial park surrounded with ponds. How
boring.


-- 
Gregory
osm at livingwithdragons.com
http://www.livingwithdragons.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/talk/attachments/20100413/d8e13923/attachment.html>