[owtchart-users] approaches for generating charts

[Tom.Kralidis@CCRS.NRCan.gc.ca]

Hi,

First off, I have to say this is a very useful and easy tool, and wish I'd
have given it some attention earlier!

My question has to do with generating charts via HTTP, in which the GET URL
is potentially huge.

Consider the following URL:

http://132.156.10.239/prototypes/owsview/scripts/3rd_party/owtchart/owtchart
-1_0_3.cgi?Type=Line&W=500&H=300&NumSets=1&NumPts=92&Title=Ottawa+Int'L.+Ont
.&Vals=-09!-11!-16!-08!-09!-15!-24!-17!-24!-16!-08!-12!-16!-22!-24!-25!-17!-
25!-16!-12!-14!-23!-08!-11!-16!-23!-15!-08!-07!-20!-08!-25!-14!-16!-16!-16!-
09!-16!-20!-22!-14!-14!-14!-17!-23!-12!-23!-25!-12!-16!-26!-16!-16!-15!-15!-
14!-16!-15!-26!-13!-19!-12!-12!-15!-12!-12!-24!-23!-23!-23!-21!-14!-15!-15!-
21!-23!-07!-14!-16!-15!-09!-08!-08!-17!-16!-13!-08!-14!-14!-16!-15!-19&XTitl
e=Time+Period+(2003-01-29T22:00:00Z+-+2003-01-28T17:00:00Z)&YTitle=Temperatu
re+(Degrees+Celsius)&XAxis=0

This one works, only because I've not included XLabels.  When I try to
include XLabels, the string length at least quadruples (URI too long
errors).

I realize that this is an HTTP GET limitation.  I have not tried an HTTP
POST yet, mainly because the page which displays this image (CGI process)
gets the data from real time sensors, and builds the URL string into an IMG
tag.

I'm wondering if anyone has encountered this issue, and if there are any
potential workarounds.

Cheers

..Tom

=================================
Tom Kralidis
Systems Scientist
Canada Centre for Remote Sensing
Tel: (613) 947-1828
http://www.ccrs.nrcan.gc.ca/
=================================