Good day everyone!
I'm posting again because honestly I do not know what to do. Can anyone lecture and help me on what to do in establishing second order control the situation is in that place the control that are established are also second order?
What are the things and documents to be prepared? What is the procedure in doing it? Do I need to design a network? if so, how can I do it?
Thanks,
Rose
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Replies
Please take advantage of the resources and advice you can get from NAMRIA. If they offer training you should take advantage of it.
NAMRIA
It is not an issue of a paid trainee. First of all she needs to know what she needs...
If I don´t undestand it wrongly...
You are in an area when you have a 2º Order Geodetic benchmarks, so do you need to use it and extend it?
or
You are in an area when you have a 1st Order Geodetic benchmarks and do you need to create a 2º Order grid?
The main issue is that you need to know which accuracy you have in the actual benchmarks you can work with... If it comes from your Government, then you should ask for a form from when you get:
Benchmark name
Benchmark Lattitude
Benchmark Long.
Benchmark Ortometric Height
Benchmark X (in the National System you are working with)
Benchmark Y (in the National System you are working with)
Benchmark Factor Scale
Benchmark X,Y Accuracy
Have you got this information?
Depends of the country, you can introduce new benchmarks through classical methodology (Astronomical observation + Geodetical) or GPS.
Depends of the country, you can build the new benchmark and observe, you can build the benchmark and pay for the observation to your National Geodetic Administration or you can´t do anything, only apply and pay.
You should get the National Specifications for benchmarks, for any order, in your country, as well.
Inside the specifications manual you will find out all the procedure and requirements instrumentation inclusive for each order geodetic controls you intend to established.
Of course your established geodetic control point has to be registered and documented by registered Surveyor to appropriate authority in charge of your country registration and documentation of geodetic control points. So carefully look for a safer place to established your geodetic control point for future and permanent used.
Since you intend to established 2nd order geodetic control then you have to transfer controls from geodetic control point higher than 2nd order e.g 1st order/country datum.
Astronomical observation has to been carried out within some specified interval to orient your direction during the course of establishment.
There are rigorous calculations involved to checked for specified tolerance of each order geodetic control point so be prepared to meet up with your country specified tolerance.
That is what I know I could tell you.