Component Table (CMP)

Filename

slc_v3r2_canada_cmp

Description

The Component Table describes each of the individual soil and landscape features which comprise the polygon (i.e. the components of the polygon). Each component includes its estimated extent, slope, stoniness, and local surface form class, as well as a link to the soil attributes provided in the Soil Name and Soil Layer tables.

Note that components apply to only the land and wetland portion of the polygon. The existence of true water bodies is described in the Land Area Table (LAT).

Contents

Contents of dataset: slc_v3r2_canada_cmp
Field Name Type Width Description
1 POLY_ID integer 7 SLC Polygon Identifier
2 CMP integer 2 Component Number
3 PERCENT integer 3 Percent of polygon occupied by the component
4 SLOPE string 1 Slope Gradient
5 STONE string 1 Surface Stoniness
6 LOCSF string 3 Local Surface Form
7 PROVINCE string 2 Province Code
8 SOIL_CODE string 3 Soil Code
9 MODIFIER string 5 Soil Code Modifier
10 PROFILE string 1 Type of soil profile
11 SOIL_ID string 11 Soil Name Identifier
12 CMP_ID integer 9 Polygon Component Identifier

Relationships

  • A record in this file is unique with respect to POLY_ID and CMP.
  • SOIL_ID is used to relate (N:1) to the Soil Name Table (SNT).

The proportion of the polygon occupied by each separate component is identified. However, their location within the polygon is not defined. While the data model does not restrict the number of components or the proportion of the polygon that they occupy, restrictions have been recommended from a subject matter/organization standpoint.

Note that the dominant component for some polygons will be a non-soil (e.g. ice or rock). Analyses involving dominant soil components should take this fact into account.

Origin

The Soil Landscape Component Table was updated for version 3.2 to meet the requirements of a number of AAFC initiatives including the National Greenhouse Gas and Carbon Accounting Validation System (NGCAVS), and the National Agri-Environmental Health Assessment and Reporting Program (NAHARP). It is based on the SLC version 2.2 component table, but has been updated to reflect new knowledge in the agricultural areas of the country. It has been compiled for all map coverages in Canada. It is a generalized version of the information that can be found in the detailed soil surveys.