Data Acquisition & Analysis for iTouch
Analysis is used to view runs that have been created by Record. Up to two runs may be analyzed simultaneously.
For the sake of simplicity, we name the runs being analyzed as Run A and Run B; the data for each may be from two different runs or from the same run. The latter is how you can analyze two different laps from the same run. Run A is displayed in yellow and Run B is displayed in cyan.
The screen below shows Run A set to run Mitch000 Lap 8 and Run B is set to run Mitch000 Lap 4 (both are pre-installed example runs). The top portion of the screen shows the QuickView graph for Run A on the left and Run B on the right.
Below the QuickView graphs is a section that displays the run name, lap and segment information; Run A is on top and Run B is below.
The four data graphs at the bottom of the screen display the track map, vehicle speed, lateral G force and longitudinal (acceleration/deceleration) G force. The X axis of the three data graphs is time starting when the data recording began for each run.
The current position in time is at the center of each graph and the actual time offset from the beginning of the run is displayed next to each run's name.
The time scale of the graphs is displayed in the lower left corner of the screen. In the example above, each graph is showing from -20s to +20s relative to the current time at the center of each graph. In other words, from 20s in the past to 20s in the future.
Touch Interactions
- Single Tap anywhere other than a button shows and hides the toolbars
- Double Tap on any of the lower graphs enlarges the tapped graph and hides the other 3 graphs
- Double Tap on an enlarged graph reduces its size to 1/4 size and displays the 3 other hidden graphs
- Sliding (dragging) a finger on the screen to the left moves the data forward in time, and to the right moves backward in time.
Run Buttons
To select a run for analysis, tap on a Run button and select a run from the list.
When a run's location has beacons defined, you can select laps and segments to analyze via the Lap and Seg buttons.
Tap on the lock icon to hold the associated data at the current time within the run. Tap the lock again to release the data so it can move forward/backward in time by sliding a finger across the screen.
Tap on the link icon keeps the Run B's current position at the same position as Run A. In other words, Run B can be linked to Run A's current position. This allows you to compare data for both runs at the same position on the track as you drag your finger across the screen. Tapping the icon again unlinks the runs. When the runs are linked the analysis is done by position, and when they are not linked, analysis is done by time.
Toolbar Buttons
Add a beacon at the current track position. Beacons are associated with a location, so it is important that runs are correctly associated with the appropriate location (See Settings and Results).
Remove all beacons from the location.
Move to the start of the run.
Int G, GPS G - Switch between internal accelerometer data and calculated GPS data for G forces. Use "Int G" for the most accurate g-force data if the iTouch was positioned accurately during the run's recording. Use "GPS G" when the iTouch was not positioned accurately.
QuickView
QuickViews is an innovative way to visualize the performance of a car as it drives around the track. It combines lateral acceleration, longitudinal acceleration, and speed differences into a single graphic that is easy to grasp.
The width of each block is proportional to lateral acceleration The length (in the direction of travel) of each block is proportional to longitudinal acceleration The inside color is red for braking, blue for accelerating. Intense red is hard braking, intense blue hard acceleration. White means you are neither braking nor accelerating.
The green outline indicates where B is faster than A, orange where it is slower. This coloring only appears when A and B are at approximately the same point on the track.