DWoolley wrote:As a seasoned map checker, I would ask for radial bearings on all points of reverse curvature (PRC), point of compound curvature (PCC) and any non-tangent curves. Additionally, I would ask that the radial bearing, both direction and annotation, be directed towards the radius point on a PCC.
The basis for the request is to be able to determine the direction of curvature. On flat PCC or PRC curves or short curves without a detail the map scales does not distinguish the direction of concavity. Having the radial bearings shown on the map saves a ton of time for the next surveyor. The alternative is to request a detail. Labeling a bearing takes minutes, drafting details takes hours. Pick your poison.
I don't find radial bearings difficult to draw on a map but I probably wouldn't add them to tangent lines or curves. County Surveyor map review comment was "why do I not hold the given radius when retracing the curves?" I was holding monuments and line tangency instead as it makes the map cleaner and I truly believe that the first time a curve (or line) is drawn on the map is the last time it will be perfect on the ground in any of the given elements anyway so what difference does it make? Any curve with a radius over 30 or 40 feet is impossible to tell if the radius is off a tenth or two.
Back in Texas the custom was to list chord bearing and chord distance for curve data along with your radius and delta. These two profound items can serve as one of the three elements defining a curve on a map. This solution solves all of the problems you guys are describing here with your radial bearings and detail drawings. It also dramatically simplifies the issue for the poor schmuck who has the misfortune to layout your goofy compound curve on the ground.
Everytime I suggest the chord bearing and distance to a CA surveyor they look at me like I got a booger on my chin so I stopped trying. To me it's just like the centerline monument in the middle of the freeway idea....
Leave it to a Californian to make an issue gratuitously complex then try to propose a solution to make it look easy! Sometimes I just sit back and wonder....Seasoned map-checker? Please, tell me more about this! Explain the practical value of the arc length on the curve data....
Someday, when I get to be a seasoned map-checker, I am going to request chord bearings on every survey plat and on subdivisions I'll require deflection angles and tangent lengths because I feel this is how it ought to be. More curve data on maps is protecting the public from unfortunate curve construction