[Tide Site Selector]
WWW Tide Predictor Usage
Key to graph colors:
- Blue
traces are total accesses to all the tide-related WWW resources.
(The gaps in 1997 and 2000 are missing log data, not loss of
service. The discontinuity at January 2001
is due to improved logfile analysis.)
- Green
traces are the number of actual tide calculations requested.
(The occasional big spikes are real: they appear to be
caused by email-address-harvesting robots set to
obsessively check every single tide site. Gosh, thanks.)
- Red
traces are the number of requests bumped back because the server
was being hit too frequently from a single IP number.
- Note that all bar charts are simply overlaid, not stacked, so
the height at the top of each color bar is its value. Do not
subtract the height of the next-lower colors (as you would if
these were stacked charts).
Daily Usage (Historical)
Daily Usage (Past Year)
Usage by Day of Week
Last 28 days only
Usage by Time of Day
Last 28 days only
Data for these plots are generated directly by the WWW Tide
set of scripts into a logfile format very similar to the standard
HTTPD Common Log Format. The data are analyzed using an
ugly custom script written in
Perl.
The plots are generated using
gnuplot.