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Published in Soil Sci Soc Am J 39:937-942 (1975)
© 1975 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Mapping Accuracy of a Contemporary Soil Survey in an Urbanizing Area1

D. F. Amos and E. P. Whiteside2

ABSTRACT

Mapping unit homogeneity was determined by the point-intercept transect method for 12 mapping units representing nearly 60% of the land area in a contemporary soil survey of an urbanizing county in south-central Michigan. By assigning a contrast value to each inclusion a "weighted contrast value" was established for each unit permitting a comparison of homogeneity among the units. Comparison of Miami drainage-sequence map units revealed a deficiency in the concept of the moderately well drained member.

At the series level "observation-mapping unit agreement" improved an average of 22% when the mapping units were renamed to more accurately reflect their actual composition. Continuing refinement of taxa together with increased interpretive demand on the cartographic delineation would seem to necessitate quantification of mapping units in subsequent soil surveys.

NOTES

1 Journal Article no. 7260. Michigan Agric. Exp. Sta., Michigan State Univ., East Lansing, MI 48824. Presented before Div. S-5, Soil Science Society of America, Las Vegas, Nevada, 12 Nov. 1973.

2 Graduate Research Assistant and Professor of Soil Science, Dept. of Crop & Soil Sciences, MSU, respectively. The senior author is presently Assistant Professor of Agronomy, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061.

Received for publication June 24, 1974. Accepted for publication May 16, 1975.






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Copyright © 1975 by the Soil Science Society of America.