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NOVA SCOTIA TOPOGRAPHIC DATABASE PRODUCTS
1:1000, 1:2000, 1:5000, 1:10 000, 1:50 000
The NSTDB consists of the following data:
Topographic
Commonly referred to as the "map base", this is a 3D dataset,
which includes the following nine standard feature code groupings: building,
designated areas, delimiters, roads & railroads, land cover, hypsography,
structures, utilities, and hydrography.
Contours
Contours display the characteristics of the terrain relief. The contour
interval varies depending on the mapping scale. For example, 1:2000 scale
mapping has a contour interval of 2 metres and 1:10 000 mapping has a
contour interval of 5 metres.
Digital Elevation Model (DEM)
The DEM is an ASCII point file which contains x, y, and z coordinate data.
Each window contains data collected every 2mm at the aerial photography
scale. This results in 20 metre or 36 metre spacing for 1:2000 mapping,
36 metre spacing for 1:5000 mapping, and 80 metre spacing for 1:10 000
mapping. For terrain modeling applications, the DEM file should be used
along with the corresponding 3D topographic breakline features in the
topographic file.
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