Pacific Northwest Research Station

Title: Processing data from soil assessment surveys with the computer program SOILS.

Author: Hazard, John W.; Snellgrove, Jeralyn; Geist, J. Michael.

Date: 1985

Source: Gen. Tech. Rep. PNW-GTR-179. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 26 p

Station ID: GTR-PNW-179

Description: Program SOILS processes data from soil assessment surveys following a design adopted by the Pacific Northwest Region of the USDA Forest Service. It accepts measurements from line transects and associated soil subsamples and generates estimates of the percentages of the sampled area falling in each soil condition class. Total disturbance is calculated by combining certain detrimental soil condition classes. Variances and confidence intervals of the percentage of each class are computed. Summary or preliminary estimates may be inserted into the program for computing sample sizes to help in planning future surveys.

A summary of the soil survey design for the Pacific Northwest Region, the estimation procedures, and the sample size calculation procedures are also provided.

Keywords: Soil surveys, computer programs/programming, sampling designs

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Citation

Hazard, John W.; Snellgrove, Jeralyn; Geist, J. Michael.  1985.  Processing data from soil assessment surveys with the computer program SOILS..   Gen. Tech. Rep. PNW-GTR-179. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 26 p