E{Z}-Kriging - Exploring the World of Ordinary Kriging .Introduction Graphical User Interface Interesting

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  • E{Z}-KrigingExploring the World of Ordinary Kriging

    Dennis J. J. Walvoort

    Wageningen University & Research CenterWageningen, The Netherlands

    July 2004 (version 0.2)

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    What is it about?Potential Users

    What is E{Z}-Kriging?

    a computer program for exploring ordinary kriging;

    interactive, self-explanatory, and easy to use.Hence, easy kriging

    and last but not least: its freeware!

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    What is it about?Potential Users

    What is E{Z}-Kriging?

    a computer program for exploring ordinary kriging;

    interactive, self-explanatory, and easy to use.Hence, easy kriging

    and last but not least: its freeware!

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    What is it about?Potential Users

    What is E{Z}-Kriging?

    a computer program for exploring ordinary kriging;

    interactive, self-explanatory, and easy to use.Hence, easy kriging

    and last but not least: its freeware!

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    What is it about?Potential Users

    Who may benefit from it?

    1 Students, who need to understand those mysterious krigingequations;

    2 Lecturers, who want to explain kriging in an intuitive way;

    3 Others, who just want to know what they are doing whenusing geostatistical software.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    What is it about?Potential Users

    Who may benefit from it?

    1 Students, who need to understand those mysterious krigingequations;

    2 Lecturers, who want to explain kriging in an intuitive way;

    3 Others, who just want to know what they are doing whenusing geostatistical software.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    What is it about?Potential Users

    Who may benefit from it?

    1 Students, who need to understand those mysterious krigingequations;

    2 Lecturers, who want to explain kriging in an intuitive way;

    3 Others, who just want to know what they are doing whenusing geostatistical software.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Graphical User Interface (GUI)

    The GUI consists of threepanels:

    1 data configurationpanel

    2 semivariogram panel

    3 kriging panel

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Graphical User Interface (GUI)

    The GUI consists of threepanels:

    1 data configurationpanel

    2 semivariogram panel

    3 kriging panel

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Graphical User Interface (GUI)

    The GUI consists of threepanels:

    1 data configurationpanel

    2 semivariogram panel

    3 kriging panel

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Graphical User Interface (GUI)

    The GUI consists of threepanels:

    1 data configurationpanel

    2 semivariogram panel

    3 kriging panel

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Data Configuration Panel

    The prediction point isred and labelled 0.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Data Configuration Panel

    The n sampling pointsare blue and labelledfrom 1 to n.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Data Configuration Panel

    The configuration ofpoints can be changedby means of the mouse(drag n drop).

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Data Configuration Panel

    The range isrepresented by a solidcircle. A dashed circlerepresents the practicalrange.

    definition

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Data Configuration Panel

    The number ofsampling points has tobe specified here (seeellipse).

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Data Configuration Panel

    The values at thesampling locations haveto be entered here.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Semivariogram Panel

    The followingsemivariogram modelscan be selected:

    Spherical modeldetails

    Exponential modeldetails

    Gaussian modeldetails

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Semivariogram Panel

    Use the sliders to setthe semivariogramparameters:

    nugget (c0)

    partial sill (c1)

    range parameter (a)

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Semivariogram Panel

    This section gives thenugget variance, the(practical) range and thesill variance (c0 + c1).

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Semivariogram Panel

    The resultingsemivariogram will beshown here.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Kriging Panel

    The ordinary krigingweights are shown asbars. Click on the barsfor numerical values.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Kriging Panel

    Use the radiobuttons toswitch between ordinarypoint kriging andordinary block kriging.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Kriging Panel

    The block size can beset by means of thesliders.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Kriging Panel

    Check this checkboxto enforce squareprediction blocks.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Kriging Panel

    The ordinary krigingprediction and theassociated variance ofthe prediction error aregiven here.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Data Configuration PanelSemivariogram PanelKriging Panel

    Kriging Panel

    Press this button toget a glimpse of theunderlying maths.

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Effects of sampling point configurationEffect of semivariogramEffect of aggregation

    Interesting features to explore

    Distance effect

    Discover that points outside the rangeaffect predictions differently than pointswithin the range (cf. inverse squareddistance interpolation).

    Dennis J. J. Walvoort E{Z}-Kriging

  • IntroductionGraphical User Interface

    Interesting features to exploreConcluding Remarks

    Effects of sampling point configurationEffect of semivariogramEffect of aggregation

    Int