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Author: Richard Gaines
Publisher:
ISBN:
Category :
Languages : en
Pages : 198
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Book Description
The report contains descriptions and documentation for four related computer programs developed to completely automate the process of preparing digital topographic data (DTD) for applications such as computerized combat situation. Basic DTD source data, supplied in standard packed-octal format by the Defense Mapping Agency, are converted to a format which can be effectively used by any FORTRAN program. (Modified author abstract).
Author: Richard Gaines
Publisher:
ISBN:
Category :
Languages : en
Pages : 198
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Book Description
The report contains descriptions and documentation for four related computer programs developed to completely automate the process of preparing digital topographic data (DTD) for applications such as computerized combat situation. Basic DTD source data, supplied in standard packed-octal format by the Defense Mapping Agency, are converted to a format which can be effectively used by any FORTRAN program. (Modified author abstract).
Author: Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 596
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Book Description
Author: Zhilin Li
Publisher: CRC Press
ISBN: 0203486749
Category : Technology & Engineering
Languages : en
Pages : 337
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Book Description
Written by experts, Digital Terrain Modeling: Principles and Methodology provides comprehensive coverage of recent developments in the field. The topics include terrain analysis, sampling strategy, acquisition methodology, surface modeling principles, triangulation algorithms, interpolation techniques, on-line and off-line quality control in data a
Author: Nancy Doreen Alexander
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
This thesis is an exploratory analysis of automated mapping protocols that can be used to support Terrestrial Ecosystem Mapping and Predictive Ecosystem Mapping in British Columbia. This thesis employs neighbourhood analysis of elevation and its derivatives to discriminate the bioterrain elements defined by Terrestrial Ecosystem Mapping standards. In achieving these standards, discrimination beyond the basic topographic forms presented in current research is explored. The method developed strives to be - easily implemented by mapping projects employing standard GIS software ; flexible so that the extracted topographic forms can be tailored to varying project objectives ; compatible with the hierarchical procedure employed in Terrestrial Ecosystem Mapping ; efficient and accurate in that the process is advantageous over manual mapping methods. The effect of data quality is addressed through an assessment of DEM data interpolation techniques and classification accuracy. Random and systematic artifacts of the DEM that influence the quality of the derivatives are explored. The issue of scale-dependent shape is addressed by the constraints of objective-based mapping in which a map scale is specified and the most basic shape elements are aggregated into contiguous classes by a roving neighbourhood window. The results indicate that basic topographic elements are mapable from relief as well as first and second order elevation derivatives. These results give preliminary accuracy of 80% based on the three classes tested. The procedure requires decisions at every step, but it is felt that this complements the traditional mapping process in that it is hierarchical, and requires a synthesis of extensive knowledge of vegetation and landscape across many scales. Key Words: elevation, digital elevation model, topography, slope, aspect, curvature, Terrestrial Ecosystem Mapping, Predictive Ecosystem Mapping, scale, random, systematic error.
Author:
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Category : Military art and science
Languages : en
Pages : 482
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Author:
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Category : Astronautics in earth sciences
Languages : en
Pages : 794
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Author:
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Category : Military research
Languages : en
Pages : 36
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Author:
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Category : Geology
Languages : en
Pages : 954
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Category : Cartography
Languages : en
Pages : 414
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Author:
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Category : Aeronautics
Languages : en
Pages : 488
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
