SLC Component Table

Filename

SLC.CMP

Description

The Component Table describes soil landscapes which are components of a polygon.

Contents

  Field  Name      Type  Width
  -----  ----      ----  -----
    1    PROV        C     2    relate key - province
    2    SHEETNO     I     2    relate key - map sheet number
    3    POLYNUMB    I     4    relate key - polygon number
    4    COMPNT      C     1    relate key - component
    5    NUMB        C     1    relate key - inclusion number
    6    PERCENT     I     3    percent occurrence
    7    KINDMAT     C     2    kind of material
    8    VEGET       C     2    vegetation/land use
    9    PMDEP       C     2    mode of deposition
   10    CFRAG       C     1    coarse fragment content
   11    ROOTDP      C     3    rooting depth
   12    DRAIN       C     1    drainage
   13    DEVEL       C     1    soil development
   14    CALC        C     1    calcareous class
   15    LOCSF       C     3    local surface form
   16    SLOPE       C     1    slope gradient
   17    SOILCODE    C     3    relate key - soil name code
   18    MODIFIER    C     3    relate key - soil name modifier

Relationships

• A record in this file is unique with respect to POLYNUMB & COMPNT & NUMB.
• POLYNUMB & COMPNT & NUMB are required to relate (1:N) to the Carbon Layer File.
• SNF & SOILCODE & MODIFIER are required to relate (N:1) to the SNF.

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. Specifically, no more than 8 components are normally identified for each polygon, and components which comprised less than 16 percent of the polygon may not be found if they do not significantly affect the spatial estimation of soil carbon.

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

Background

The Soil Landscape Component Table was developed in response to the requirements of the Soil Carbon Database. It has been compiled for all map coverages in Canada and is beneficial to all other applications because it consists of major attributes important to plant growth and land management. The attribute list of the component file consists of a subset of those in the original dominant and subdominant files compiled for the provincial map coverages. However, the component file allows for more than two soil landscapes per polygon, and provides explicit descriptions of inclusions.

effective Version 1.0. Contact:

• J. Shields (provincial coverages)
• D. Kroetsch (territorial coverages)