| Product(s): | WaterSight |
| Version(s): | 10.00. |
| Area: | Documentation |
Comparing sensor data with modelled data
The uploaded WaterGEMS model will be running in WaterSight in real time, fed by real sensor measurements at the boundary conditions, if all configurations are properly set - see instructions here.
Once configured, it is also possible to directly compare measured data with modelled data in order to to check the accuracy of the hydraulic model. It is important to highlight that this comparison can be done for any sensor that is associated with a hydraulic model element.
For example this can be particularly useful to directly compare sensor data from flow meters or pressure meters with model results data. For that you need to create a SCADA signal element in WaterGEMS and assign it to a junction (if pressure) or to a pipe (if flow). More information how to set up the mapping here - Preparing WaterGEMS model for real time simulation in WaterSight.
Map Workflow
In the Map page, turn on the hydraulic widget. You will notice pump, tank, valves and wi-fi icons represented with a dot/circle. The dot/circle indicates that those model elements are connected to a sensor element. Green color means that the sensor has good data, red means that the sensor has no data or data is delayed. Yellow/orange means partial data. Click on that model element and you will be able to see in the side panel the name of the sensor displayed. In the small graph that gets displayed you will also be able to see the model value at blue, and the sensor value at black
Directly comparing these two lines at some points of interest allow the user to understand how calibrated and accurate the model can be. Using the measurement dropdown located on the top left of the graph allows to change the measurement that is displayed in the graph for the specific selected element.
If the display labels (toggle located on top of the side panel) is on, that you will be able to see all the sensor names associated with model elements in the map.
Another important note: if the black and the blue line match the exact same value for the initial time step of the model run (when the blue line starts), then it means that sensor data is being used to set the initial conditions for the model run. In case there is a gap between the value for the initial timestep of the model run and the sensor data, then the sensor data is not being used to actively set the initial conditions of the model.
Graph workflow
Go to the sensor overview page, or sensor detail graph page, and turn on model results visibility, see figure below. Model results will be displayed as a blue line in the graphs and you can easily compare with sensor data at black. This is the easiest way to check the fitness between model and measured results;
Please note that while in the Map page only the the last simulation run result is displayed (based on hindcast and forecast defined in Admin), in the graphs under network monitoring it is displayed a combined model series. As per each day we can have several model runs (based on the run frequency defined in the Admin), WaterSight aggregates each model series run into one combined model series. More information here – Accessing model results.
See Also
Preparing WaterGEMS Model for real time simulation in WaterSight