The Data-Gap Filler allows users to fill data gaps in gridded time-series.
The Data-Gap Filler utility is launched from the Tools | Data | Gap Filler menu in HEC-HMS.
A project does not have to be open to access the Data-Gap Filler.
Step 1: Select Source Variables
Select a Source Grid file using the File Browse button (1). When a source file is selected, its Variables will be displayed in the Available Variables column (2). Variables can be moved from the Available Variables column to the Selected Variables column (2 to 3) by double-clicking the variable or using the arrows to move the selected variable.
At least one variable must be selected to proceed.
Step 2: Select an Interpolation Method
Select an interpolation method (1). Interpolation will be performed between existing gridded records. Spatial fill methods are recommended when a cell or group of cells are missing for all time steps. Temporal fill methods are recommended when a cell or group of cells are not missing for the extent of the record.
At least one interpolation method must be selected to proceed.
Step 3: Select Insert Missing Time Steps
Select Insert Missing Time Steps (1). If selected, gridded records will be inserted at missing time-steps using linear interpolation between existing time-steps.
Step 4: Select Destination
The File Browse button (1) can be used to browse to a Destination file. If the destination file is HEC-DSS format, additional options are presented for specifying pathname parts (2). Some pathname parts cannot be edited and will be populated automatically. There are also options for changing the DSS Units (3) and DSS Data Type (4).
Step 5: Processing
After Next has been selected on Step 4, a progress bar will display, indicating the progress of the Data-Gap Filler. Messages indicating status will be presented in the message panel.
Step 6: Data-Gap Filler Complete
After the Data-Gap Filler is complete, the wizard will automatically progress to step 6, indicating that the conversion is complete. There are buttons to Restart or Close the wizard. The gap-filled data will be saved to the user selected HEC-DSS file (set in step 4).
If time-step fill is selected in addition to data-gap fill, the gap fill is processed in two steps. The progress bar will indicate data-gap fill progress first, and then re-set for time-step fille progress.
