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CITY Workshop - Context Data Collection

24-28th June 2002

As part of the City Workshop, and to enable future testing without site visits, several files of raw data have been collected. This page contains links to these original raw data files; some preliminary analysis of these files; and a single combined file for testing of the larger infrastructure along with a WinCE viewer application.

The trail shown in Figure 1 on the right  was completed four times with different combinations of data being collected as shown in the table below. Three location pingers with 10m ranges were placed at points 'p' in fig 1. 

trail.jpg (32494 bytes)

Figure 1. Trail with Pingers


The test equipment is shown in Figure 2. It consisted of  a Garmin eTrex Vista; a Polar Heart Rate Monitor strap  with DCP receiving sensor and custom interface; 'Vee's' Jacket producing position, location and heading data in CityMack protocol; and two H-P Jornada 568s for data logging.

test_rig.jpg (16773 bytes)

Figure 2 - Test Equipment

Raw Data

Trail 1 Raw NMEA Raw data sentences from eTrex Vista
Images Set of images from Nisis PenCam
Trail 2 Raw NMEA
Heart monitor Format: timestamp, rate, period(filtered), period(raw)
Trail 3 Context messages City Protocol
Heart monitor
Trail 4 Context messages (UCL relocates to the Bay of Biscay!)
Heart monitor

Heart Rate graphs

Trail 2 Heart Rate

heart2.jpg (10292 bytes)

Trail 3 Heart Rate

heart3.jpg (10577 bytes)

Trail 4 Heart Rate

heart4.jpg (11077 bytes)

All three graphs show a marked increase in heart rate around the part where the steps were climbed. The low heart rate at the beginning and end of trail 2 appear reasonable reflecting an appropriately relaxed state.The graphs for trails 3 & 4 show an overall higher heart rate possibly due to wearing Vee's Jacket (it was hot in there!). The various other peaks and troughs remain to be explained.

Hybrid Data and Viewer

The 'best' results have been combined into a reference file for further testing.

The three images below illustrate this data being used in a Jornada viewing application:-

The tiny 'green man' is shown walking when a valid GPS signal is received, has his arms outstretched when a location pinger is detected, and turns into a question mark when no current position is available.

The yellow arrow in the blue square is the sensed heading, and the size of the red 'bow-tie' represents the user's heart rate.

All the base data used in the hybrid file and in the viewing application was collected by sensors at UCL on 27th June

28th June 2002



This page last updated July 9, 2002
The material displayed is provided 'as is'. Contents may not be reused without prior permission.
For problems or questions regarding this web contact Cliff Randell.