I'm trying to use a scatter chart to plot level reading for a pump
station level sensor.
The sensor takes a reading every 4 seconds, and there are 23,000
reading per chart
There appears to be a limit of 4000*4000 data points in MS Chart so I
have had a play with the Office 10 activX chart control, but cant get
that to plot the data at all. It always try to summaries the data for
some reason fathomable only to Bill Gates! Mind you, the MS Graph
wizard does the same, but at least I can work around this wizard, but
with the active X one I cant seem to specify X and Y data sets without
them being summarised.
So how can I reduse my dataset down to less than 4000 records to use
the MS Graph object.
Here is a sample of the data
DateTime Level1
07/09/07 13:22:06 2.96
07/09/07 13:22:10 2.98
07/09/07 13:22:14 2.98
07/09/07 13:22:18 2.96
07/09/07 13:22:22 2.96
07/09/07 13:22:26 2.96
07/09/07 13:22:30 2.98
07/09/07 13:22:34 2.96
07/09/07 13:22:38 2.98
07/09/07 13:22:42 2.96
07/09/07 13:22:46 2.96
07/09/07 13:22:50 2.96
07/09/07 13:22:54 2.98
07/09/07 13:22:58 2.98
07/09/07 13:23:02 2.98
07/09/07 13:23:06 2.98
07/09/07 13:23:10 2.98
07/09/07 13:23:14 3
07/09/07 13:23:18 3
07/09/07 13:23:22 2.98
07/09/07 13:23:26 2.98
07/09/07 13:23:30 2.98
07/09/07 13:23:34 2.98
07/09/07 13:23:38 3
07/09/07 13:23:42 2.98
07/09/07 13:23:46 3
07/09/07 13:23:50 2.98
07/09/07 13:23:54 3
07/09/07 13:23:58 2.98
07/09/07 13:24:02 3
07/09/07 13:24:06 3
07/09/07 13:24:10 2.98
07/09/07 13:24:14 3
07/09/07 13:24:18 3
07/09/07 13:24:22 2.98
07/09/07 13:24:26 3
07/09/07 13:24:30 3
07/09/07 13:24:34 2.98
07/09/07 13:24:38 3
07/09/07 13:24:42 3
07/09/07 13:24:46 2.98
07/09/07 13:24:50 2.98
07/09/07 13:24:54 2.98
07/09/07 13:24:58 3
07/09/07 13:25:02 3
07/09/07 13:25:06 2.98
07/09/07 13:25:10 3
07/09/07 13:25:14 2.98
07/09/07 13:25:18 3
07/09/07 13:25:22 3
07/09/07 13:25:26 3.02
07/09/07 13:25:30 3
07/09/07 13:25:34 3
07/09/07 13:25:38 3.02
07/09/07 13:25:42 3.02
07/09/07 13:25:46 3
07/09/07 13:25:50 3.02
07/09/07 13:25:54 3.02
07/09/07 13:25:58 3.02
07/09/07 13:26:02 3.02
07/09/07 13:26:06 3
07/09/07 13:26:10 3.05
07/09/07 13:26:14 3.05
07/09/07 13:26:18 3.02
07/09/07 13:26:22 3
07/09/07 13:26:26 3.05
07/09/07 13:26:30 3.05
07/09/07 13:26:34 3.02
07/09/07 13:26:38 3.02
07/09/07 13:26:42 3
07/09/07 13:26:46 3.02
07/09/07 13:26:50 3.05
07/09/07 13:26:54 3.05
07/09/07 13:26:58 3.02
07/09/07 13:27:02 3.05
07/09/07 13:27:06 3.02
07/09/07 13:27:10 3.02
07/09/07 13:27:14 3.05
07/09/07 13:27:18 3.05
07/09/07 13:27:22 3.05
07/09/07 13:27:26 3.05
07/09/07 13:27:30 3.02
07/09/07 13:27:34 3.02
07/09/07 13:27:38 3.05
07/09/07 13:27:42 3.05
07/09/07 13:27:46 3.05
07/09/07 13:27:50 3.05
07/09/07 13:27:54 3.05
07/09/07 13:27:58 3.02
07/09/07 13:28:02 3.05
07/09/07 13:28:06 3.02
07/09/07 13:28:10 3.05
07/09/07 13:28:14 3.05
07/09/07 13:28:18 3.07
07/09/07 13:28:22 3.07
07/09/07 13:28:26 3.09
07/09/07 13:28:30 3.12
07/09/07 13:28:34 3.14
07/09/07 13:28:38 3.14
07/09/07 13:28:42 3.16
07/09/07 13:28:46 3.19
07/09/07 13:28:50 3.21
07/09/07 13:28:54 3.21
07/09/07 13:28:58 3.28
07/09/07 13:29:02 3.3
07/09/07 13:29:06 3.3
07/09/07 13:29:10 3.33
07/09/07 13:29:14 3.35
07/09/07 13:29:18 3.33
07/09/07 13:29:22 3.39
07/09/07 13:29:26 3.42
07/09/07 13:29:30 3.42
07/09/07 13:29:34 3.46
07/09/07 13:29:38 3.46
07/09/07 13:29:42 3.49
07/09/07 13:29:46 3.49
07/09/07 13:29:50 3.51 high point
07/09/07 13:29:54 3.51 high point
07/09/07 13:29:58 3.51 high point
07/09/07 13:30:02 3.49
07/09/07 13:30:06 3.51
07/09/07 13:30:10 3.49
07/09/07 13:30:14 3.46
07/09/07 13:30:18 3.46
07/09/07 13:30:22 3.46
07/09/07 13:30:26 3.44
07/09/07 13:30:30 3.44
07/09/07 13:30:34 3.46
07/09/07 13:30:38 3.44
07/09/07 13:30:42 3.44
07/09/07 13:30:46 3.44
07/09/07 13:30:50 3.44
07/09/07 13:30:54 3.42
07/09/07 13:30:58 3.39
07/09/07 13:31:02 3.42
07/09/07 13:31:06 3.42
07/09/07 13:31:10 3.37
07/09/07 13:31:14 3.37
07/09/07 13:31:18 3.37
07/09/07 13:31:22 3.35
07/09/07 13:31:26 3.33
07/09/07 13:31:30 3.35
07/09/07 13:31:34 3.35
07/09/07 13:31:38 3.33
07/09/07 13:31:42 3.3
07/09/07 13:31:46 3.25
07/09/07 13:31:50 3.25
07/09/07 13:31:54 3.23
07/09/07 13:31:58 3.23
07/09/07 13:32:02 3.23
07/09/07 13:32:06 3.21
07/09/07 13:32:10 3.19
07/09/07 13:32:14 3.16
07/09/07 13:32:18 3.14
07/09/07 13:32:22 3.14
07/09/07 13:32:26 3.12
07/09/07 13:32:30 3.09
07/09/07 13:32:34 3.09
07/09/07 13:32:38 3.05
07/09/07 13:32:42 3.02
07/09/07 13:32:46 3
Its a sewerage pump stations, so we have inflow that fills the pump
chamber until the water level hits the start float and the pump kicks
in. This will draw the water level down untill the stop float turns
the pump off and the level starts rising again. This cycle continues
through out the monitoring period.
I'm only interested in the highs and lows, but the problem is that due
to the wave action and sensitivity of the sensor, the difference in
level between consecutive readings cant be used to identify the top or
bottom of each cycle as it may just be a "false" high.
So, how do I filter out the intermediate records so I have just the
highs and lows with the date time against each?
Cheers
Grant