AltaLIS Surface Contours

AltaLIS Surface Contours is provided through a partnership between IHS and AltaLIS. The 1:20,000 Digital Contour Data file is a digital representation of a land's relief that is geo-referenced to the AB Survey Control Markers. This data focuses on Contour Linework, two dimensional contour lines, and arcs at ten meter (20 meters in mountainous regions) intervals, and elevation text derived from 1:20,000 DEM data. The contours consist of arcs and index annotation that combine to create a cartographic theme to define Alberta's topography. The contour is based on the AltaLIS comprehensive Digital Elevation Module. 

Benefits:

With AltaLIS Surface Contours, you can:

• Efficiently perform emergency response plan mapping with the level of detailed culture provided 
• Develop a comprehensive understanding of your area of interest

AltaLIS Surface Contours portray the shape and elevation of the land. The 1:20,000 digital contours were derived from photogrametrical-compiled Digital Elevation Data (DEM). The Alberta DEM was created through the compilation of location data captured through stereo plotting aerial photography.

Contour Specifications:

• Accuracy: +/- 5 m for X & Y, +/- 3m for Z 
• Absolute is determined by ASCM markers 
• Relative depends on the terrain 
• Intervals: The contours are 10m spacing, except for 20m spacing in mountainous regions