UCL Carbon Monoxide Data Collection at DAPPLE Site May 2004

Carbonmonoxide data from the DAPPLE site on Marylebone road was collected over a period of two weeks by a group from UCL. The first week of data collection coincided with week 2 of the DAPPLE project, starting on Tuesday 4 May 2004 and finishing on Monday 10 May 2004, excluding the weekend. During this week, data was collected by walking along the pavements carrying pollution logging equipment. The next week of data collection stated on Monday 17 May 2004 and finished on Friday 21 May 2004, coinciding with DAPPLE week 5. This week was intended to be mainly cycling, but, due to a shortage of experienced cyclists, it became a combination of walking and cycling.

Click on any of the images to see the full size picture.

Equipment

For the Green, Red and Yellow packs, the following equipment was available:

• Rucksack
• HP Jornada PDA
• ICOM Carbon Monoxide Monitor
• HAICOM GPS
• Extension aerial for HAICOM GPS
• White Box GPS
• Aerial for white box GPS

For the Blue pack, the following equipment was available:

• Rucksack
• HP Jornada PDA
• ICOM Carbon Monoxide Monitor
• HAICOM GPS
• Extension aerial for HAICOM GPS

In use the equipment is placed in a rucsack to allow hands free operation, with the GPS aerials attached to the top of the pack with Velcro. All the pollution monitors are in a pocket open to the air on the right hand side of the pack, unless otherwise noted. It is possible to place two packs of equipment into one rucksack and have a pollution monitor on both the left and right sides.

The HAICOM GPS units were always used with external aerials fitted, unless specifically noted in the log. These GPS devices should get a fix within about a minute of being switched on, while the white box types take a lot longer.

In use, the ICOM units appear to give some artificially high CO readings immediately afer being switched on. For this reason, any readings taken in the first 20-30 seconds are unreliable.

Data Sampling and File Formats

gpslog_06-05-2004_104008.txt
log_06-05-2004_104008.txt

527846.29 181944.89 1083850772 1083847154 1.6 0.7 19.6 12.0
527845.03 181944.12 1083850773 1083847155 1.6 0.7 19.6 12.0
527845.03 181944.12 1083850774 1083847155 1.6 0.8 19.6 12.0
527842.25 181944.42 1083850775 1083847157 1.6 0.8 19.6 12.0
527842.25 181944.42 1083850776 1083847157 1.6 0.8 19.6 12.0
527842.25 181944.42 1083850777 1083847157 1.6 0.8 19.6 12.0
527839.75 181947.32 1083850778 1083847160 1.6 0.7 19.6 12.0
527839.02 181948.41 1083850779 1083847161 1.6 0.7 19.6 12.0

Position	Example		Description
1	527846.29		Current East coordinate from the GPS in OSGB coordinates, or -1 if there was no GPS fix.
2	181944.89		Current North coordinate from the GPS in OSGB coordinates, or -1 if there was no GPS fix.
3	1083850772		The time of the sample taken from the PDA's internal clock.
4	1083847154		The time of the last GPS fix from the GPS device, or -1 if the time could not be read. It is possible to get a GPS time, but no position data in which case the East and North coordinates are both -1.
5	1.6		The raw carbonmonoxide reading from the ICOM device, or -1 if the device could not be read.
6	0.7		The base carbonmonoxide value from the ICOM device, or -1 if the device could not be read.
7	19.6		The temperature of the sensor in the ICOM device in Celsius, or -1 if the device could not be read.
8	12.0		The current voltage of the internal battery in the ICOM device, or -1 if the device could not be read.

NOTE: In order to calculate the true carbonmonoxide amount, it is necessary to take the raw carbonmonoxide reading and subtract the base value. For example, from the first line of the log file above, 1.6 - 0.7 = 0.9.

Routes

The two DAPPLE walking routes are on either side of Marylebone road. On the North side, which is the Baker Street tube station side, the route starts at the traffic lights outside the Landmark Hotel and continues along Marylebone Road, finishing at the traffic lights after the tube station but before crossing over to the Madame Tussauds side.

The other walking route is on the South side of Marylebone road, which is the side Westminster council is on. The route is parallel to the previous route on the North side, starting and finishing at the same points on the opposite side of the road. The route begins opposite the Landmark Hotel, on the South side of the road beside the junction with Enford Street and then continues along Marylebone road until the public lavatory outside Westminster University, just after Chiltern Street.

Both routes can be walked in either direction and, using a walker on each side of the road, comparisons between the North and South sides of Marylebone Road can be made. The direction of walking is noted in the experiment log, but can be seen visually from the GPS traces.

The cycle route is more complicated, making a figure eight with Westminster Council at the centre. The route starts at the Montagu bus stop on Gloucester Place. Cyclists then cycle North up Gloucester Place, which is a one way street. On reaching the junction with Marylebone Road, they cycle straight across, continuing along Gloucester Place until the second left turn into Dorset Square, going around the North side of the square anticlockwise, joining Balcombe Street as the route heads South. They then walk across the junction with Marylebone Road, into Upper Montagu Street briefly before turning left into Salisbury Place and cycling around the back of Westminster Council. At the junction with Gloucester place they cross into Bickenhall Street and cycle along until turning right into Baker Street. They cycle South down Baker Street finally turning right into Dorset Street. At the end of Dorset Street is the finish point at the junction with Gloucester Place. From there, the cyclists either stop, or continue around for another circuit.

During the two weeks, the cycle route was covered by both cyclists and walkers, with one walker starting with the cyclist and another walker starting half way around the route. This is a very effective comparison of the difference between walking and cycling. Due to the one way streets, which are part of the cycle route, cyclists must always travel the same way round, while walkers can do the route in reverse. The direction of walking is noted in the experiment log and can be seen from the GPS data.

DAPPLE Week 2 - Walking

NOTE:

1. All log times are given in the format Hour:Minute:Second.
2. The images are colour coded with 0 ppm carbonmonoxide shown as a black dot, becoming more red as the carbonmonoxide increases, up to 10ppm shown as a full intensity red dot. Any values over 10ppm are hard limited to 10ppm, but this was exceptional. The highest value for the two weeks was 12.4 ppm. Where no sensor reading was taken, for example if the lead came loose from the ICOM, this is reported in the log as -1 and plotted as black.

Tuesday 4 May 2004

Wednesday 5 May 2004

Thursday 6 May 2004

Friday 7 May 2004

Monday 10 May 2004

DAPPLE Week 5, Cycling

NOTE:

1. All log times are given in the format Hour:Minute:Second.
2. The images are colour coded with 0 ppm carbonmonoxide shown as a black dot, becoming more red as the carbonmonoxide increases, up to 10ppm shown as a full intensity red dot. Any values over 10ppm are hard limited to 10ppm, but this was exceptional. The highest value for the two weeks was 12.4 ppm. Where no sensor reading was taken, for example if the lead came loose from the ICOM, this is reported in the log as -1 and plotted as black.

Mon 17 May 2004

Tuesday 18 May 2004

Wednesday 19 May 2004

Thursday 20 May 2004

Friday 21 May 2004