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20 floor is not that much high so try to use the method mentioned above with consideration the same control points (1st order) have to be used until the end of the project to avoid any accumulative error which can occurred while generate the (2nd order CP).
In case of you can't apply resection method because of surrounding buildings so you can make CP inside the building on the lower floors use(Vertical Laser Plummet) to transfer the SAME POINTS to the higher floors through small opening on each slab, so we can avoid any accumulative error.
we have to do traverse around the building area and establish proper bench marks with out any error using Bowditch rule.. simply set instrument on top of anywhere and use resection method to start ur survey. or else use core wall control survey system.
A little less complicated, can be RESECTION on each floor using your Total Station, just be sure the Ground Control Points are VERY GOOD, this is maximum3 mm Residual difference and1" angle residual difference, check all your GCP, then you can set your Control Points on top of the adjacent buildings and GO...
yes this reliable method we use many time.
what is (core wall control survey system.)????reyaskhan sainlapathy
you have to eastblish your network by traversing around the building and establish TBM's with out any error using Bowditch rule.
simply use resection methode on ur building to execute work
Better way of transfer control point by laser instrument keep sleeves 10cm by 10cm every floor First mark control point at ground or first floor then by laser shift points and check after 4 floors
By the method of resection to at least known external control point in the ground.
