DPRG mailing list archives: [DPRG] Long Haul Way Points

Sun Sep 10 15:15:20 CDT 2006

I have a very sensitive GPS unit on my latest project. I have picked up
4 or more satellites when my Garmin unit could not pick up any. I
usually get multiple satellites everywhere. My unit is also WAAS
enabled. 

I can try to verify the positions.

Kip

On Sun, 2006-09-10 at 11:52 -0500, David P. Anderson wrote:
> Howdy,
> 
> I went by Fair Park yesterday to verify Martin's waypoints and got the
> following.  John, you might try these out with Google Earth:
> 
> start:	N  32.77715
> 	W 096.76190
> 
> waypt1	N  32.77753
> 	W 096.76208
> 
> waypt2	N  32.77770
> 	W 096.76266
> 
> waypt3	N  32.77790
> 	W 096.76249
> 
> Note that these are specified in decimal degrees (hddd.ddddd) as are Martin's
> rather than degrees-minutes-seconds.
> 
> The first waypoint is in the shadow of the Science Place building on two sides
> and I was only able to get three satellites at that location, so it is not
> a very accurate measurement.  Likewise with waypt2, which is in the building
> shadow and also under a large tree.  
> 
> For those who might like to try another challenge while we are at FiarPark,
> here are the 2 waypoints to go from the meadow next to the Science Place
> to the meadow next to Texas Star Ferris wheel, which must circumnavigate the
> Band Shell, as jBot demonstrated in a round trip a few months ago:
> 
> start:	N   32.77634		// Water cover next to TSP
> 	W  096.76179
> 
> end:	N   32.77631		// In front of Ferris Wheel.
> 	W  096.75965
> 
> 
> A little more challenging is the route from the Science Place meadow, 
> across the entrances and parkinglots to the field behind the Natural
> History Museum:
> 
> start:	N  32.77636		// Water cover next to TSP
> 	W 096.76179
> 
> end:	N  32.77821		// Behind Nat'l Hist Museum
> 	W 096.76369
> 
> 
> For those without obstacle avoidance working, you might want to at least
> run a demo course.  Here is one laid out earlier this year. This was for
> those who might have a navigating robot but don't have obstacle avoidance
> working yet.  
> 
> It begins in front of the Cotton Bowl and has a second
> waypoint at a bend in the road, and a third point in
> front of the Aquarium where the path is blocked.
> 
> Plaza in front of Cotton Bowl (intersection of brick paths):
> 
> start:	N  32.77790 		// Cotton Bowl Plaza
> 	W 096.76112 
> 
> 
> waypt1	N  32.77707 		// Corner of Band Shell:
> 	W 096.76085 
> 
> 
> finish:	N  32.77654		// In front of Aquarium
> 	W 096.76042 
> 
> Here is an ariel view with the route marked out in red, from
> upper left to lower right:
> 
> <http://geology.heroy.smu.edu/~dpa-www/robo/jbot/jbot2/fairpark2_x.jpg>
> 
> 
> best,
> dpa
> 
> 
> John wrote:
> > I plotted the way points with Google Earth.  I don't know what is ground
> > truth, that is Google Earth also has errors.  I was comparing them to
> > the map posted on the web.  
> > 
> > Start:  Was in the grass NNE of the round doom.
> > WP1:  Looked like it is on the edge of the sidewalk.
> > WP2:  Halfway between building and sidewalk, 8 meters from the corner of
> > the building (to the southeast)
> > Finish:  Across 2d street in the parking lot 195 meters from WP2.  This
> > point was also located here by TopoUSA.  Since TopoUSA doesn't show the
> > building (all of Fair Park is just a green blob) I couldn't use it to
> > verify the other points. 
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-- 
Kipton Moravec <kip at kdream.com>