GMS:Observations: Difference between revisions
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{{Infobox Calibration}} | {{Infobox Calibration}} | ||
Observations can be either point observations or flow observations. | |||
==Point Observations== | ==Point Observations== | ||
The primary type of field data used in a typical calibration exercise is point observations. Point observations represent values that are measured at some location in the field. Point observations generally correspond to water table elevations measured at observation wells. However, multiple observed values can be defined at each observation point. Observation points are managed in the Map module using the [[GMS:Coverages#Coverage_Setup|''Coverage Setup'']] dialog. | The primary type of field data used in a typical calibration exercise is point observations. Point observations represent values that are measured at some location in the field. Point observations generally correspond to water table elevations measured at observation wells. However, multiple observed values can be defined at each observation point. Observation points are managed in the Map module using the [[GMS:Coverages#Coverage_Setup|''Coverage Setup'']] dialog. | ||
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<!--<math>\frac{1}{ \big( \text{Standard Deviation} \big) ^2 * \text{Group Weight} }</math>--> | <!--<math>\frac{1}{ \big( \text{Standard Deviation} \big) ^2 * \text{Group Weight} }</math>--> | ||
[[Image:observeq1.jpg]] | :[[Image:observeq1.jpg]] | ||
Note that GMS will automatically convert from an interval and a confidence to a standard deviation, or directly enter the standard deviation. | Note that GMS will automatically convert from an interval and a confidence to a standard deviation, or directly enter the standard deviation. | ||
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<!--:sd = CI/z | <!--:sd = CI/z | ||
:<math>sd = \frac{CI}{z}</math>--> | :<math>sd = \frac{CI}{z}</math>--> | ||
[[Image:observeq2.jpg]] | :[[Image:observeq2.jpg]] | ||
where sd is the standard deviation, CI is the confidence interval, and z is the the "z statistic" based on the specified confidence and the normal distribution. Enter an interval and confidence, and the standard deviation will be computed; or enter a standard deviation and confidence, and the interval will be computed. | where ''sd'' is the standard deviation, ''CI'' is the confidence interval, and ''z'' is the the "z statistic" based on the specified confidence and the normal distribution. Enter an interval and confidence, and the standard deviation will be computed; or enter a standard deviation and confidence, and the interval will be computed. | ||
In practical terms entering an interval (or standard deviation) and confidence is an indication of how much error is believed to be associated with the observed value. | In practical terms entering an interval (or standard deviation) and confidence is an indication of how much error is believed to be associated with the observed value. | ||
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For example, if having the following set of head measurements for one observation well: | For example, if having the following set of head measurements for one observation well: | ||
{| style="text-align:center; border: 1px solid gray; padding: 5px;" | :{| style="text-align:center; border: 1px solid gray; padding: 5px;" | ||
!width="150"|Date | !width="150"|Date | ||
!width="75"|Head | !width="75"|Head | ||
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[[Category:Calibration]] | [[Category:Calibration]] | ||
[[Category:Calibration Dialogs]] | |||
[[Category:GMS Dialogs|O]] | [[Category:GMS Dialogs|O]] | ||
[[Category:Equations|O]] | [[Category:Equations|O]] | ||
[[Category:Observations]] |