SMS:Residual vs. Observed Data Plot: Difference between revisions

From XMS Wiki
Jump to navigationJump to search
No edit summary
 
Line 9: Line 9:
After the plot type is set in Step 1 of the ''Plot Wizard'', next to move to Step 2 where the plot options will be available:
After the plot type is set in Step 1 of the ''Plot Wizard'', next to move to Step 2 where the plot options will be available:


*''Coverage'' – Displays the name of the coverage where the current data for the plot is coming from.
*''Coverage'' – Sets the coverage where the current data for the plot is coming from. If there is only one, it simply displays the name of the observation coverage.
*''Measurement'' – This is the name of the current measurement, created in the ''Feature Objects'' |''' Attributes''' dialog, being plotted.
*''Measurement'' – Sets the measurement data the plot will use. This measurement was created in the ''Feature Objects'' |''' Attributes''' dialog. If there is only one, it simply displays the name of the Measurement.
*''Feature Objects'' – Displays which feature object is utilized in the current plot, points or arcs.
*''Feature Objects'' – Sets which feature object is utilized in the current plot, points or arcs. If there is only one, it simply displays the name of the feature object.
*''Use current solution'' – This option causes the plot to compare the observed values with the residual values of the current solution and time step for each observation point. When the active solution changes, the plot is recomputed and updated. If only one solution is in memory then this option is defaulted and is not visible in the dialog.
*''Use current solution'' – This option causes the plot to compare the observed values with the residual values of the current solution and time step for each observation point. When the active solution changes, the plot is recomputed and updated. If only one solution is in memory then this option is defaulted and is not visible in the dialog.
*''Use selected solutions'' – This option causes the plot to compare the observed values with the residual values of the specified solution for each observation point. Changing the active solution does not affect the plot.
*''Use selected solutions'' – This option causes the plot to compare the observed values with the residual values of the specified solution for each observation point. Changing the active solution does not affect the plot.

Latest revision as of 20:01, 14 April 2022

A Residual vs. Observed plot is used to display how well the entire set of observed values for observation points matches the solution data. On this plot is drawn a horizontal line along an error of zero, representing what would be a perfect correspondence between observed data and solution values. Then, one symbol is drawn for each observation point at the intersection of the observed and residual (computed minus observed) values for the point. This plot can show the trend of the solution values with regards to matching the observed data. Only those points whose value is specified as observed for the selected data type will be shown in the plot. These plots are created in the Plot Wizard setting the Plot Type to "Residual vs. Observed Data". A sample plot is shown in the figure below.


Res v obs plot.jpg


Residual vs. Observed Plots

After the plot type is set in Step 1 of the Plot Wizard, next to move to Step 2 where the plot options will be available:

  • Coverage – Sets the coverage where the current data for the plot is coming from. If there is only one, it simply displays the name of the observation coverage.
  • Measurement – Sets the measurement data the plot will use. This measurement was created in the Feature Objects | Attributes dialog. If there is only one, it simply displays the name of the Measurement.
  • Feature Objects – Sets which feature object is utilized in the current plot, points or arcs. If there is only one, it simply displays the name of the feature object.
  • Use current solution – This option causes the plot to compare the observed values with the residual values of the current solution and time step for each observation point. When the active solution changes, the plot is recomputed and updated. If only one solution is in memory then this option is defaulted and is not visible in the dialog.
  • Use selected solutions – This option causes the plot to compare the observed values with the residual values of the specified solution for each observation point. Changing the active solution does not affect the plot.

Residual vs. Observed Troubleshooting

If a plot will not generate or does not display significant data, it's possible that the conditions for the plot have not been set up correctly. To get a meaningful plot, take the following into account:

  • This plot requires an observation coverage with feature points included that have observation data from the field. If there is more than one observation coverage, ensure the correct observation coverage is selected on step 2 of the Plot Wizard.
  • This plot requires a simulation with calculated data of the same type of data as the observation coverage (velocity, for example). If the simulation does not have solution datasets, then this plot will not have significant results.
  • The dataset desired for visualization should be selected in the Project Explorer. Which dataset is selected affects what displays in the plot.

Related Topics