Soil Landscapes of Canada (SLC)
The SLCs are a series of GIS coverages that show the major characteristics of soil and land for the whole country. SLCs were compiled at a scale of 1:1 million, and information is organized according to a uniform national set of soil and landscape criteria based on permanent natural attributes.
The SLCs are based on existing soil survey maps which have been recompiled at 1:1 million scale. Each area (or polygon) on the map is described by a standard set of attributes. The full array of attributes that describe a distinct type of soil and its associated landscape, such as surface form, slope, water table depth, permafrost and lakes, is called a soil landscape. SLC polygons may contain one or more distinct soil landscape components and may also contain small but highly contrasting inclusion components.
The location of these components within the polygon is not defined. SLCs were originally conceived as a standardized database consisting of major attributes important to plant growth, land management, and soil degradation. These data have since turned out to be a useful framework to support other databases, including Environment Canada's Ecological Land Classification System.
Soil Landscape versions
The creation of the SLC database has taken a number of years. Updates and corrections to boundaries, attributes and file structures have taken place over the years. The version number reflects these updates. The number before the decimal place identifies the version of the polygon boundaries, while the number after the decimal place refers to the version of the attribute data for those polygons. New versions are released as major structural or attribute changes are implemented. The following versions have been released:
|Version 1.0||starting in 1991|
|Version 2.0||November 1994|
|Version 2.1||July 1995|
|Version 2.2||December 1996|
|Version 3.0||December 2004|
|Version 3.1||March 2006|
|Version 3.1.1||August 2007|
|Version 3.2||March 2011|
Soil Landscapes Illustrations
Internet Mapping Application
The SLC web map contains a few simple interpretations based on a combination of versions 2.2 and 3.1.
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