Length, duration, renumber | After editing of tracks, the total length and duration and also the numbering of the trackpoints can be recalculated using this function. |
Altitude from DEMs | Normally the Altitude column will contain the measured altitude values from the GPS receiver. In cases where altitude information is not available you can calculate altitude values from the DEM (digital elevation model). This requires that you have installed a suitable DEM in your QV system. By default, also existing altitude values will be overwritten. However, by disabling the Overwrite existing altitude values switch you can also use this function to fill trackpoints where altitude is missing just due to a bad satellite coverage. In this case only altitude values equal to “0” will be overwritten. |
Edit Altitude | Using this function, you can edit all altitude values of a given tracks. Two options are available: Multiply - All values will be multiply with the defined coefficient Add (Scale shift) - a constant factor will be added or subtracted. |
Course from coordinates | With tracks recorded through the GPS Online mode, the Course column will contain the heading values as measured by the GPS receiver. Tracks from other origin may contain “0” in the Course column. Using this function the course will be calculated from the consecutive trackpoints and be stored in the Course column. |
Speed | With tracks recorded through the GPS Online mode, the Speed column will contain the speed values as measured by the GPS receiver. Tracks from other origin may contain “0” in the Speed column. Using this function speed will be calculated from the consecutive trackpoint distances and the time interval and be stored in the Speed column. |
Times from start and speed | Using this option you can assign a new time scale to the trackpoints. For this purpose you can enter a starting date and time and the time for all consecutive trackpoints will be recalculated accordingly. There are three options for recalculating the trackpoint times: Set new starting time: In this case the time scale will only be shifted according to the new starting point. Time differences between points will not be changed. Constant Speed: A constant speed is assumed and the trackpoint times will be recalculated from the starting point and the cumulative time needed to cover the distances from point to point with the defined speed. From distance and speed: Speeds between trackpoints are calculated from distance and time intervals and trackpoint times will be recalculated from the starting time and the cumulative time needed to cover the distances from point to point with the calculated speeds. |