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Numerical Classification Of Soils And Its Application In Survey

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Numerical Classification Of Soils And Its Application In Survey

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Author :
language : en
Publisher:
Release Date : 1977

Numerical Classification Of Soils And Its Application In Survey written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Agriculture categories.

Numerical Classification Of Soils And Its Application In Survey

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Author : J. J. de Gruijter
language : en
Publisher:
Release Date : 1977

Numerical Classification Of Soils And Its Application In Survey written by J. J. de Gruijter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Science categories.

Numerical classification of soils was studied with emphasis on methodology and feasibility in survey. A procedure was designed for construction of classes sufficiently homogeneous in terms of relevant properties and handlable by the surveyor. In the procedure 'central' depth-profiles are calculated separately for each property (e.g. clay content), from a sample of depth-profiles, with a relocation method minimizing within-class variances. Any soil profile can thus be identified in the field by allocating its constituent depth-profiles to the central depth-profile that is most similar for the respective properties. Resulting strings of class labels serve for interim data recording. If too many combinations of central depth-profiles arise to map all individually, they are fused into larger classes and within-class variances are again minimized. This procedure was applied to survey data from a marine clay area in the Netherlands: field estimates for 6 properties in 2212 profiles divided into 20 depth intervals. A new method was used to map classes automatically. Tests showed that: samples of several hundred profiles were needed; order of profiles and initial solution for relocation had little effect on results; only extreme weighting significantly affected homogeneity for different variables. Choice of weights and number of classes should be related and supported by sensitivity analysis..

Terrain Analysis

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Author : John P. Wilson
language : en
Publisher: John Wiley & Sons
Release Date : 2000-08-03

Terrain Analysis written by John P. Wilson and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-08-03 with Science categories.

The only reference on the use of GIS and related technologies in terrain analysis In this landmark publication, reflecting the collaborative effort of thirteen research groups based in four countries, leading experts detail how GIS and related technologies, such as GPS and remote sensing, are now being used, with the aid of computer modeling, in terrain analysis. Continuing the innovative work of Professor Ian Moore, a visionary who saw terrain analysis as a robust method for modeling the large areas and complex spatial patterns of environmental systems, Terrain Analysis puts into action TAPES, or Terrain Analysis Programs for Environmental Sciences, Dr. Moore's innovative tool for terrain analysis. The book's contributors describe how TAPES are applied to specific geomorphologic problems, explain the algorithms used in current terrain analysis software, and examine the interpretation and use of terrain attributes in predictive models. With expert coverage of terrain analysis in the digital age, Terrain Analysis will be welcomed by ecologists, environmental engineers, geographers, and hydrologists who increasingly depend on GIS, GPS, and remote sensing.

Field Guide To Soils And The Environment Applications Of Soil Surveys

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Author : Gerald W. Olson
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Field Guide To Soils And The Environment Applications Of Soil Surveys written by Gerald W. Olson and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Social Science categories.

The success of the book Soils and the Environment imagination in the applications of soil surveys, illustrates the need for further, more detailed toward the end of improving productivity and information about soil survey interpretations (uses efficiency in the use of soils and the environment. of soil surveys), especially for laypersons, teachers, Although laypersons, teachers, and students are the and students. Much information about soils and primary groups addressed by this Field Guide, the environment is secluded in offices of various other people involved with using soil surveys are agencies and institutions and thus is not readily (or will be) agriculturalists, agronomists, assessors, available to the people who need it. Techniques for botanists, conservationists, contractors, ecologists, finding and using the information are also not well economists, engineers, extension workers, fores known, so there is great need for this Field Guide ters, geologists, groundwater experts, planners, to Soils and the Environment to provide teachers politicians, public health officials, range managers, and learners with exercises that will give them recreationists, soil scientists, wildlife specialists, and many others. This Field Guide complements practice leading to confidence in the manipulation and enhances the book Soils and the Environment and utilization of soil survey data. In a sense, all published in 1981. of us are (or should be) learners and teachers in the use of soil survey information. This Field Guide DONALD R.