What does "VEN" stand for on a C/L tie sheet?
-
liftmys10
- Posts: 56
- Joined: Tue Jun 19, 2007 10:07 am
What does "VEN" stand for on a C/L tie sheet?
What does "VEN" stand for on a C/L tie sheet?
Shawn Ohannessian, PLS
County of Ventura, Surveyor II
County of Ventura, Surveyor II
-
Dave Lindell
- Posts: 295
- Joined: Tue Dec 10, 2002 9:17 pm
- Location: Pasadena
-
Dave Lindell
- Posts: 295
- Joined: Tue Dec 10, 2002 9:17 pm
- Location: Pasadena
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"
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"
-
liftmys10
- Posts: 56
- Joined: Tue Jun 19, 2007 10:07 am
yup, thats what i just noticed they were for triangulation stations. First time hearing about that. thanksDave 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"
Shawn Ohannessian, PLS
County of Ventura, Surveyor II
County of Ventura, Surveyor II
-
Dave Karoly, PLS
- Posts: 670
- Joined: Fri Aug 30, 2002 6:26 pm
- Location: Sacramento
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?
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?
"Gee, I wish we had one of them doomsday machines." -General "Buck" Turgidson
-
Dave Lindell
- Posts: 295
- Joined: Tue Dec 10, 2002 9:17 pm
- Location: Pasadena
Dave K.
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.
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.