Component Table (user view)

Filename

• {covername}_CMP.DBF (source file)
• {covername}.CMP  (in arc/info workspace)

Description

The Component Table identifies the soils which are components of a Soil Map Unit.

Contents

1	MAPUNIT	CHAR	68		primary key (redefined from  PROVINCE + SURVEY + MAPUNITNOM)
2	CMP	INTEGER	2		component number
3	PERCENT	INTEGER	3		area occupied by component
4	SLOPE	NUMERIC	5	1	slope
5	STONINESS	CHAR	1		stoniness
6	SOILTYPE	CHAR	9		linkage key  (redefined from PROVINCE + SOIL_CODE + MODIFIER + LU)
	CLI	CHAR	1		CLI (Canada Land Inventory) rating (optional)
	CLISUB1	CHAR	1		CLI subclass 1 (optional)
	CLISUB2	CHAR	1		CLI subclass 2 (optional)
	EROSION	CHAR	1		erosion risk (optional)
	SALINITY	CHAR	1		salinity (optional)
	ROCKINESS	CHAR	1		occurrence of rocks at the surface (optional)
	SLOPE_LENGTH	CHAR	1		slope length, typical (optional)

Relationships

• A record in this file is unique with respect to  MAPUNIT  & CMP.
• MAPUNIT is required to relate (1:N) to the PAT.
• SOILTYPE is required to relate (1:N) to the NAME and LAYER tables.  Without changes to the last character of the SOILTYPE field, linkages to the NAME and LAYER tables will follow the assumption that land use is agricultural.  For more information, see the documentation for the LU_FLAG field in the NAME table.
• Attributes which apply to the entire Soil Map Unit are found in the Map Unit Table

Limitations

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

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

Background

Soil Map Unit Tables were created starting in 1998 from information in the original SMUF files. The CMP number was mapped directly from the number following items of the same name in the original SMUF structure (i.e. SOIL_CODE1 became CMP 1).

effective Version 1.0 Source: Wally Fraser and Gary Patterson and Peter Schut
Contact: Peter Schut