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  1. Book ; Online: Recent Advances and Applications in Remote Sensing

    Hung, Ming-Chih / Wu, Yi-Hwa

    2018  

    Keywords Geographical information systems (GIS) & remote sensing ; stress, big data, gis, image processing, data fusion, distributed computing
    Language English
    Size 1 electronic resource (214 pages)
    Publisher IntechOpen
    Document type Book ; Online
    Note English
    HBZ-ID HT030645047
    ISBN 9781838812713 ; 1838812717
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  2. Article: Accuracy and Effort of Interpolation and Sampling: Can GIS Help Lower Field Costs?

    Simpson, Greg / Wu, Yi Hwa

    ISPRS international journal of geo-information. 2014 Dec. 05, v. 3, no. 4

    2014  

    Abstract: Sedimentation is a problem for all reservoirs in the Black Hills of South Dakota. Before working on sediment removal, a survey on the extent and distribution of the sediment is needed. Two sample lakes were used to determine which of three interpolation ... ...

    Abstract Sedimentation is a problem for all reservoirs in the Black Hills of South Dakota. Before working on sediment removal, a survey on the extent and distribution of the sediment is needed. Two sample lakes were used to determine which of three interpolation methods gave the most accurate volume results. A secondary goal was to see if fewer samples could be taken while still providing similar results. The smaller samples would mean less field time and thus lower costs. Subsamples of 50%, 33% and 25% were taken from the total samples and evaluated for the lowest Root Mean Squared Error values. Throughout the trials, the larger sample sizes generally showed better accuracy than smaller samples. Graphing the sediment volume estimates of the full sample, 50%, 33% and 25% showed little improvement after a sample of approximately 40%–50% when comparing the asymptote of the separate samples. When we used smaller subsamples the predicted sediment volumes were normally greater than the full sample volumes. It is suggested that when planning future sediment surveys, workers plan on gathering data at approximately every 5.21 meters. These sample sizes can be cut in half and still retain relative accuracy if time savings are needed. Volume estimates may slightly suffer with these reduced samples sizes, but the field work savings can be of benefit. Results from these surveys are used in prioritization of available funds for reclamation efforts.
    Keywords geographic information systems ; lakes ; planning ; prioritization ; sediments ; surveys ; Black Hills region
    Language English
    Dates of publication 2014-1205
    Size p. 1317-1333.
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    Note Journal Article
    ZDB-ID 2655790-3
    ISSN 2220-9964
    ISSN 2220-9964
    DOI 10.3390/ijgi3041317
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Assessment and visualization of spatial interpolation of soil pH values in farmland

    Wu, Yi-Hwa / Hung, Ming-Chih / Patton, Jamie

    Precision agriculture. 2013 Dec., v. 14, no. 6

    2013  

    Abstract: Site-specific farming entails fine-scale detection of field parameters that affect yield coupled with directing appropriate management inputs to select areas that improve field-scale cropping system profitability. Currently, limited technologies are ... ...

    Abstract Site-specific farming entails fine-scale detection of field parameters that affect yield coupled with directing appropriate management inputs to select areas that improve field-scale cropping system profitability. Currently, limited technologies are available to evaluate spatial variability in soil properties on a fine scale (submeter resolution). Therefore, information is typically generated by collecting discrete samples and utilizing spatial interpolation to estimate data for the unsampled locations. In this study, soil pH samples were collected from a 12.15� ha agricultural field in northwest Missouri using two grid-sampling regimes: 0.11� ha with 110 samples and 0.98� ha with 12 samples. Three spatial interpolation methods (inverse distance weighted, spline and kriging) were tested to evaluate the effects of interpolation on unsampled locations. In addition to quantitative validation evaluations, results were also assessed by 2D visualization and 3D visualization. Although each assessment approach provided useful information, the inverse distance weighted technique overall better-estimated soil pH values as determined by a combination of all three approaches.
    Keywords cropping systems ; kriging ; precision agriculture ; profitability ; soil heterogeneity ; soil pH ; Missouri
    Language English
    Dates of publication 2013-12
    Size p. 565-585.
    Publishing place Springer-Verlag
    Document type Article
    ZDB-ID 1482656-2
    ISSN 1385-2256
    ISSN 1385-2256
    DOI 10.1007/s11119-013-9316-7
    Database NAL-Catalogue (AGRICOLA)

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