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What does "VEN" stand for on a C/L tie sheet?
Posted: Wed Aug 27, 2008 1:30 pm
by liftmys10
What does "VEN" stand for on a C/L tie sheet?
Posted: Wed Aug 27, 2008 2:05 pm
by Dave Lindell
What county?
In what context is it used?
Posted: Wed Aug 27, 2008 2:14 pm
by goodgps
For that matter, what is a C/L?
Vent,
Ventura
Vend
Victor E. Norris ?
Posted: Fri Aug 29, 2008 10:54 am
by liftmys10
Sorry, havent had a chance to look at my thread.
Its used as "VEN G-1" and "VEN H-I" I have confirmed that they mean Venice Blvd intersection monuments. So thanks all for looking.
Posted: Fri Aug 29, 2008 12:03 pm
by Dave Lindell
No, they mean the points are first- or second-order traverse or trianglulation stations situated in the "Venice" quadrangle.
They have Zone VII coordinates and usually precise elevations.
They may or may not be on centerline intersections.
The named-quadrangle system was a cooperative City-County(ies?) system for identifying control points.
You can probably get more information from Los Angeles City Survey Division, which has a lot of stuff online at "NavigateLA"
Posted: Fri Aug 29, 2008 12:14 pm
by liftmys10
Dave Lindell wrote:No, they mean the points are first- or second-order traverse or trianglulation stations situated in the "Venice" quadrangle.
They have Zone VII coordinates and usually precise elevations.
They may or may not be on centerline intersections.
The named-quadrangle system was a cooperative City-County(ies?) system for identifying control points.
You can probably get more information from Los Angeles City Survey Division, which has a lot of stuff online at "NavigateLA"
yup, thats what i just noticed they were for triangulation stations. First time hearing about that. thanks
Posted: Sat Aug 30, 2008 7:04 am
by Dave Karoly, PLS
L.A. is cool.
I found a bunch of City of L.A. field notes (centerline ties) which had CCS27z7 coordinates which were measured by triangulation (Topanga). They're probably pretty close to reality but I don't know exactly how close without a field trip.
What were they thinking (Zone 7); northings look like eastings?
Dave K.
Posted: Sat Aug 30, 2008 9:05 am
by Dave Lindell
Yep, California Coordinate System 1927, Zone 7, where northings AND eastings started with a four (million).
An old Water Department triangulation point near Cahuenga Peak was chosen as the controlling point. It already had coordinates of, say, (and don't quote me on this) N 1,234,567.89 and E 987,654.32, so they changed it to 4,234,567.89 N and 4,987,654.32 E. Zone VII was the only zone to ever have a non-even central point. The Water Department coordinates were Lambert Polyconic, I think.