Comparison reading with GPS and PDUK

6 GPS points were observed and a conversion coordinate from WGS84 to local cassini solder was carried out for each point before I went back to site to search for the boundary marks. Initially I assumed that these GPS reading were relevant with the PDUK info. The GPS reading could not convert into Geocentric cassini solder because the NDCDB is not available for this particular place thus we need to convert the GPS reading into old cassini Solder which based on the state origin.

On the first day, we found an old pipe near the bamboo patch but about 2m away from the computed point. Thus, I assumed that the old pipe in position and searched for the next boundary. A sound of crack on the next mark proved that the old pipe was re fixed correctly. A few boundary marks were found even after nearly 1km traverse and the conclusion from this experience is error of conversion between geographic coordinates (Æ, l, h) and Cartesian coordinates (X, Y, Z) due to difference datum. So, how good is our NDCDB? Still a big question mark to public including me. Friendly speaking, public only trust on the boundary mark and no the coordinate.

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