ODiSI data files are very large and it makes them time consuming to process

ODiSI data files can get very large due to the ODiSI’s ability to have an extremely small gauge pitch and a still relatively high sample rate. There are multiple ways to help manage this.

• If you only need data from a portion of the sensor, use touch to locate to mark the start and end of the area of interest. You can then create a segment from these two points and delete the default segment which is the whole sensor. Now when you export your .tsv file only select the gauges and segments file.
• Use the largest gauge pitch that will still meet the needs of your test.
• You can set a lower sample rate 2 different ways.
  • For target sample rates that are still above about 1 Hz use a temporal down sample factor. Go to settings -> filter and down sample to enable a temporal down sample factor. The software will tell you what your new sample rate will be as you adjust the factor.
  • For target sample rates at or below 1 Hz set a trigger. Go to settings -> triggers and set your time interval between scans. Note that you can also set the number of scans to make, but these are not evenly spaced throughout your time interval. For example, if you set a time interval of 2 and the number of scans to 4, 4 scans will be taken at the default sample rate every 4 seconds not one scan every 0.5 seconds.
• If you only need the data around some event that happened, use the playback test data tool. Go to tools -> playback test data. Find the start and end time index that covers the data of interest. When you export your .tsv file, you can specify what indices to export.