The HEC-MetVue data manipulation tools are very useful when analyzing "what-if" scenarios to assess impacts if forecast scenarios were to shift (move, rotate, shrink, enlarge, become more intense, etc.). For example, "what-if" the center of a forecast storm were to shift (translate), grow (scale) or change direction (rotate) so that it is now centered directly over a reservoir? The HEC-MetVue data manipulation tools allow the user to modify the gridded data to approximate answers to such questions.

Data manipulation options include: 

Translate: allows the user to translate (shift in space) the selected data from one location to another.

Scale: allows the user to scale the data to cover more or less area.

Rotate: allows the user to rotate the direction of data.

Trim: allows the user to trim datasets. This may be handy if your dataset is much larger than your area of interest.

Tool Tips Note

HEC-MetVue has several useful tool tips that appear when hovering the cursor over the various icons:

 

Test the Data Manipulation Tools.

Adjust Measurement Values for the entire TIN or a desired area of the TIN.

Note that the data manipulations through the Trim and Adjust Measurement Values tools are accomplished by drawing a polygon () and/or right clicking when you have finished sketching.

To Save the polygon that was drawn, Right-Click on the polygon, select Ad-Hoc Polygon Operations, then Save Polygon to Shapefile.

Feel free to make any edits using the Translate/Rotate/Trim tools and undo () them as you wish.


  • Adjusting the measurement values to magnify total precipitation volume.

    • Draw polygon () > Right-Click > Ad-Hoc Polygon Operations > Polygon Operations > Adjust Measurement Values > Multiply Measurements by a Constant Value 

  • Trimming the center of the storm & translating it directly over the Bald Eagle watershed.

    • Draw polygon () > Right-Click > Ad-Hoc Polygon Operations > Polygon Operations > Delete Points inside polygon > Select Translate Tool () to reposition the storm.

Animate the Gridded Data. 

Gridded data can also be animated within HEC-MetVue and played incrementally or as an accumulated sequence over time.

To animate the September 2018 precipitation event over the watershed, dock the animation toolbar by hovering over the lower edge of the map window and checking the box on the left side of the toolbar.

Once the animation toolbar is docked, HEC-MetVue will buffer the gridded data and the animation controls will become available.

Select the Play button () on the toolbar to animate the incremental precipitation event over the watershed.

Note that the default settings will animate the incremental precipitation on an hourly timestep with a default speed. The date range indicates the exact time period displayed as the animation plays.

Adjust the animation controls to slow down playback to 1 frame per second and animate the 6-hour cumulative precipitation by dragging the right handle of the blue slider bar further to the right until its date range spans a 6-hour time period (for example: 07Sep2018 1100 - 07Sep2018 1700). 

Select the Play button () on the toolbar to animate the precipitation event over the watershed in 6-hour cumulative increments at an hourly timestep.

Note that you can also advance manually throughout the animation by selecting the blue slider bar with the mouse and sliding the bar throughout the event.

Continue testing additional animation setting combinations to view the precipitation event.

Tasks

Part A – HEC-MetVue Orientation:

Part B – HEC-MetVue Data Input:

Part C – HEC-MetVue Precipitation Preprocessing for input into HEC-HMS :