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Using and improving surface models built by computer (view source)
Revision as of 13:05, 8 July 2014
, 13:05, 8 July 2014→Error correction
This technique is used to correct a surface model that does not honor the data. It is also used to update a surface model when new data are added and when it is undesirable to rebuild the model, only to adjust it to the new data. The general steps are (1) back interpolate from the original surface model a z value at each data location, (2) determine the error at those locations by subtracting the interpolated value from the data value, (3) model the error, and (4) add the error to the original model ([[:file:using-and-improving-surface-models-built-by-computer_fig4.png|Figure 4]]). This procedure is commonly used to shift a surface model built from seismic data so that it passes through (honors) well data.
This technique is used to correct a surface model that does not honor the data. It is also used to update a surface model when new data are added and when it is undesirable to rebuild the model, only to adjust it to the new data. The general steps are (1) back interpolate from the original surface model a z value at each data location, (2) determine the error at those locations by subtracting the interpolated value from the data value, (3) model the error, and (4) add the error to the original model ([[:file:using-and-improving-surface-models-built-by-computer_fig4.png|Figure 4]]). This procedure is commonly used to shift a surface model built from seismic data so that it passes through (honors) well data.
[[file:using-and-improving-surface-models-built-by-computer_fig5.png|left|thumb|{{figure number|5}}Contour maps of the same data. (a) Most algorithms weight data isotropically and creat circular surface forms. (b) Single direction bias forces elliptical weighting, allowing surface form to stretch in one direction.]]
[[file:using-and-improving-surface-models-built-by-computer_fig5.png|300px|thumb|{{figure number|5}}Contour maps of the same data. (a) Most algorithms weight data isotropically and creat circular surface forms. (b) Single direction bias forces elliptical weighting, allowing surface form to stretch in one direction.]]
====Directional bias====
====Directional bias====