Metadata for the North Coast Aggregate Potential Project

Data Custodian: Peter Bobrowsky

Produced: 2001

Datum Shift Information:
The surficial polygons were mapped from 1:40,000 scale airphotos. 
These polygons were transferred to and digitized from 1:50,000 scale 
topographic map sheets.  The mapsheets had a NAD27 datum and 
UTM projection.
A datum shift from NAD27 to NAD83 was completed on the polygon 
coverage, drill hole coverage and the ARIS drill hole coverage.  
The aggregate classification shapefile (agg_poly) was then clipped 
using a coastline polygon constructed from 1:20,000 scale TRIM I data.  This coastline is included in this project as a line coverage.  
Due to the differing scales of the polygon coverage(mapped at 1:50,000)
and the coastline coverage (1:20,000 TRIM data) the polygon data, at 
points, does not correspond with the coastline. Due to the dynamic 
nature of rivers the surficial polygons may be offset when overlayed
with rivers from NAD83 base maps.  A river coverage, developed from 
1:250 000 maps (NAD83) is included within the project.