Download or read book Soil Survey Contracts and Quality Control written by S. Western and published by Oxford University Press, USA. This book was released on 1978 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Some Strategies of Quality Control for Reconnaissance Soil Survey written by Humberto G. dos Santos and published by . This book was released on 1978 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil maps of nine areas representing distinct physiographic patterns and land use were evaluated by three different procedures to study the accuracy in predicting mapping unit composition, and the relevance of procedures for different kinds of areas in relation to effort required. The physiographic and soil patterns studied are believed to be representative of range, forest, and mixed range and forest in mountainous terrain, nearly level, rainfed and irrigated cropland, general farming in rolling and hilly terrain, coastal areas and desert areas. Delineations of selected soil association on generalized soil maps at scales ranging from 1:190,080 to 1:380,160 were tested by point transects, line transects and pilot areas using soil surveys at scales of 1:20,000 or larger as the ground truth. Topographic maps and aerial photographs were used to identify physiographic units, land use patterns and topographic characteristics. Random transects that crossed the grain of the landscape were selected and drawn on detailed soil maps of each of the study areas. With the point transect method, soil units were noted on pre-fixed point at constant intervals of 0.05 kilometer up to 4.0 kilometers along the paths of observation. Soil units were noted along the same transect using different intervals, that is, observations at each 0.05 kilometer along its entire length, then at each 0.1 kilometer and so on up to 4.0-kilometer intervals. Line transects were located similarly, and all soil changes along the of observation noted. Pilot areas were selected to depict small, representative areas according to physiographic features that could be extrapolated to similar units of landscapes. Point transects provided the number of point observations of each soil unit; line transects provided length, in kilometers, of soil units between soil changes; and pilot areas provided the extension, in hectares, of each soil unit observed. Because transects and pilot areas were of different sizes, data obtained by these procedures were statistically analyzed by a cluster type of analysis to estimate proportions of kinds of soils in each association. In additon to proportions of soil units, confidence intervals, accuracy of predicting mapping unit composition, standard deviation, standard error of the mean, coefficient of variation and number of elements needed (transects or pilot areas) were calculated. The numbers of transects and pilot areas were calculated to meet certain probability levels. For example, 80 percent probability with 10 percent allowable error around the mean was used for mountainous areas, and 95 percent probability with 10 percent allowable error for all other areas. Point transects with intervals between observations ranging from 0.05 Kilometer to 0.2 kilometer required more effort per square kilometer than line transects or point transects with larger intervals between observations. Effort per square kilometer decreased with increasing spacing between observations along point transects, but the number of transects needed to meet predetermined levels of accuracy tended to increase when intervals larger than 0.5 kilometer were used. Increasing the number of transects or pilot areas to test soil association provided more accurate estimates of soil proportions and smaller erros of estimations, however, with increasing effort per square kilometer. Based on number of transects and pilot areas needed to attain the accuracy level fixed for the study areas, it was found that the effort per square kilometer varies with profound that the effort per square kilometer varies with procedure and type of landscape. In general, the point and line transects required less effort per square kilometer in all areas tested. Point transects with intervals between observations ranging from 0.2 kilometer to 2.0 kilometer generally required less effort in most of the test areas. For some areas the line transect method is equivalent or slightly better than point transects in terms of effort in man-hours/km2.

Download or read book Some strategies of quality control for reconnaissance soil survey written by H. G. dos SANTOS and published by . This book was released on 1978 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil maps of nine areas representing distinct physiographic patterns and land use were evaluated by three different procedures to study the accuracy in predicting mapping unit compostion, and the relevance of procedures for different kinds of areas in relation to effort required. The physiographic and soil patterns studied are believed to be representative of range, forest, and mixed range and forest in mountainous terrain, nearly level, rainfed and irrigated cropland, general farming in rolling and hilly terrain, coastal areas and desert areas. Delineations of selected soil association on generalized soil maps at scales ranging from 1:190,080 to 1:380,160 were tested by point transects, line transects and pilot areas using soil surveys at scales of 1:20,000 or larger as the ground truth. Topographic maps and aerial photographs were used to identify physiolographic units, land use patterns and topographic characteristics. Random transects that crossed the grain of the landscape were selected and drawn on detailed soil maps of each of the study areas. With the point transect method, soil units were noted on pre-fixed points at constant intervals of 0.05 kilometer up to 4.0 kilometers along the paths of observation. Soil were noted along the same transed using different intervals, that is, observations at each 0.05 kilometer and so on up to 4.0 - kilometer intervals. Line transects were located similarly, and all soil changes along the path of observation noted. Pilot areas were selected to depict small, ............

Download or read book Developing a Method for Quality Control of Data Submitted to OPAL Soil Survey written by Artemis Kostareli and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil Conservation written by and published by . This book was released on 1979-08 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil Resource Inventories and Development Planning written by and published by . This book was released on 1979 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surveys Plans and People written by International Institute for Environment & Development and published by IIED. This book was released on 1993 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surveying and Mapping written by and published by . This book was released on 1979 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil Survey Papers written by Wageningen. Stichting voor Bodemkartering and published by . This book was released on 1977 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil Survey written by J. Alfred Zinck and published by Food & Agriculture Org.. This book was released on 1995 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Booker Tropical Soil Manual written by J.R. Landon and published by Routledge. This book was released on 2014-01-27 with total page 531 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1991. This is a more portable version of the Booker Tropical Soil Manual, in which the format (and weight) of the first edition have been reduced whilst retaining as much as possible of the original clarity. It also includes new content and appendices that cover the revised FAO publications on soil classification and on water quality for agriculture.

Download or read book Land and its Uses Actual and Potential written by F. T. Last and published by Springer Science & Business Media. This book was released on 2013-03-08 with total page 577 pages. Available in PDF, EPUB and Kindle. Book excerpt: During its existence the Ecosciences Panel of the North Atlantic Treaty Organisation was constantly concerned with (i) the communic ation gap between the generators of ecological/environmental infor mation and those who use it and (ii) the narrow interpretation of 'environmental' which too frequently was taken as being synonymous with pollution. Because of this concern, and because the panel recognised that land-use is perhaps the overriding facet of environmental policy it was decided to arrange the Seminar recorded in this volume :- Land and its Uses : Actual and Potential An Environmental Appraisal The development of this Seminar was chaired by Professor F. T. Last who was enthusiastically supported by B. G. Bell (U.K.), Drs S. Bie (Norway), 0. W. Heal (U.K.), R. Herrmann (Federal Republic of Germany), M.C.B.Hotz (formerly of NATO, Belgium, but now in Canada), L. Munn (Canada) and N. Yassoglou (Greece). Together, they decided that the participants should include (i) planners/decision makers and (ii) scientists generating ecological/environmental infor mation, in the hope that they would gain a better understanding of each others problems and attitudes and as a result identify how information can be prepared in a more usable form.

Download or read book Nature Conservation written by C Margules and published by CSIRO PUBLISHING. This book was released on 1990-01-01 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of a Cost Effective Biological Surveys and Data Analysis workshop held at the old Quarantine Station, North Head, Sydney, in March 1988, under the auspices of the Council of Nature Conservation Ministers (CONCOM) and the Australian Environment Council (AEC).

Download or read book Board of Contract Appeals Decisions written by United States. Armed Services Board of Contract Appeals and published by . This book was released on 2003 with total page 958 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Soil Survey Handbook written by United States. Soil Conservation Service and published by . This book was released on 1993 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Literature of Soil Science written by Peter McDonald and published by Cornell University Press. This book was released on 1994 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of 14 discussions of the past and present literature about soil science. The topics include a historical survey, bibliometrics, introduction into developing countries, societies and their publishing influence, information systems, core monographs, primary journals, maps, and other aspec

Download or read book Advances in Agronomy written by and published by Academic Press. This book was released on 2016-04-22 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Agronomy continues to be recognized as a leading reference and first-rate source for the latest research in agronomy. Each volume contains an eclectic group of reviews by leading scientists throughout the world. As always, the subjects covered are rich, varied, and exemplary of the abundant subject matter addressed by this long-running serial. Includes numerous, timely, state-of-the-art reviews Features distinguished, well recognized authors from around the world Builds upon this venerable and iconic review series Covers the extensive variety and breadth of subject matter in crop and soil sciences