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These 2m contours were made from the DTM 10m grid which were a by product of the 0.125m resolution aerials done some 10 years ago.
They say the DTM can be used , as a rule of thumb, as fine as 2m +/- 1m.
Reference to LINZ datum One tree Point mean Sea level.

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Layer ID: 1426
Data type: Vector multilinestring
Feature count: 47513
Elevation: Z (CONTOUR)
Attributes: GEOMETRY, CONTOUR
Added: 22 Apr 2010
Revisions: 1
Current revision: Imported on Nov. 24, 2011 from Shapefile in NZGD49 / New Zealand Map Grid.
Views: 620
Downloads: 67

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