AnsweredAssumed Answered

Misaligned Land Parcel Update

Question asked by orpc on Jun 1, 2012
Latest reply on Jun 14, 2012 by orpc
I have been given an updated version of the land parcels layer for a geodatabase that covers the company's service area (From Hunter GIS). This update is in fact a new shape file that I am to replace the old shapefile with. This would not usually cause any problems but when I uploaded the new shapefile and placed it over the existing one, the road edges and property lines did not line up. Some of the parcel's edges were misaligned by up to 20 metres in some places.

Biggest issue - not a uniform misalignment. Some places line up well but others are skewed, either to the north east, south east, you name it.

Both shapefiles are projected on NAD 1983 in zone 18N, and when comparing some coordinates on the original map to coordinates on google earth (plotted on WGS 84)they were a close match - 0.5m difference. When comparing the same google earth coordinates to the same point on the new land parcels layer they differed by 3m and 8m for Eastings and Northings respectively.

If I have left any information out that might help solve the problem please let me know and I will do my best to answer.

Question: how do I re-align these so they match?
Can anyone explain why the 'correct version''s coordinates do not match those of Google Earth?

Any help is appreciated!

Outcomes