How to calculate land areas for SLC components

Overview

These instructions explain how to calculate the land area applicable to Soil Landscape components identified in the SLC Component Table

Instructions

The following sample datasets are used to illustrate this calculation.

Table 1: Component Table (CMP)

Polygon (SL)	Component (CMP)	Percent Occurrence (PERCENT)	Soil Development (DEVEL)	...other CMP attributes
1	1	40	Brown Solonetzic
	2	30	Brown Chernozemic
	3	30	Brown Chernozemic

Table 2: Landscape Attribute Table (LAT)

Polygon (SL)	polygon land area LAND_AREA (ha)	...other LAT attributes
1	1,000

Joining the LAT to the Component Table via the SL field results in the following:

Table 3: LAT joined to the Component Table

Polygon (SL)	Component (CMP)	Percent Occurrence (PERCENT)	Soil Development (DEVEL)	...other CMP attributes	polygon land area LAND_AREA (ha)	...other LAT attributes
1	1	40	Brown Solonetzic		1,000
	2	30	Brown Chernozemic		1,000
	3	30	Brown Chernozemic		1,000

The area of land occupied by each component can then be calculated with the formula

    component land area = PERCENT x LAND_AREA / 100

Table 4: Land area for each component

Polygon (SL)	Component (CMP)	Percent Occurrence (PERCENT)	Soil Development (DEVEL)	...other CMP attributes	LAND_AREA (ha)	...other LAT attributes	component land area (ha)
1	1	40	Brown Solonetzic		1,000		400
	2	30	Brown Chernozemic		1,000		300
	3	30	Brown Chernozemic		1,000		300

effective version 2.2