Recent Changes - Search:

HomePage

LBA

Mt Pleasant 26m

Ceduna 30m

Mt Pleasant 14m

Ceduna-Hobart Interferometer

Schedules

AuScope

PmWiki

edit SideBar

Weather

System:weather.phys.utas.edu.au
IP address:131.217.63.161
Processor:Intel Pentium III 450 MHz
RAM:128MB
HDD:1 x 6.4GB IDE
Operating system:Fedora Core 4
Location:Rear server room, under desk, Mt Pleasant observatory
Purpose:Connected to MET3 weather sensor

The observatory’s MET3 weather sensor measures temperature, atmospheric pressure and humidity. It is connected to this weather machine via serial port.

The computer runs the metserver code that is part of the PC field system station package, and this is started on boot. This program is located at /usr2/st/metserver/metserver, and the code is at /usr2/st/metserver/src.

This program starts up a network server listening on port 30384 for requests from clients. Almost continuously, the server will serially communicate with the sensor and get the latest weather data from it, and this data is stored in memory. Whenever a client connects to the server, the server passes the latest available data to the client.

A metclient task runs on hobart to log the weather conditions at the observatory. At boot time for hobart, the program /usr2/st/metclient.old/metclient is started, and every minute this process logs the weather conditions from the MET sensor to /usr2/log/wxYYDDDHO.log, where YY is the last two digits of the year, and DDD is the day of the year. An example line from this log is:

2008.334.04:57:48.00/wx/10.8,1002.3,69.7

The year and day of year are given at the start of the line, along with the UT time that the data was obtained. The /wx/ refers to the task that got the data (because it is a field system task), and the last three values on the line are comma separated; these are (in order) temperature (in Celcius), atmospheric pressure (in HPa), and humidity (in %).

It should be noted that the old hobart machine had been logging this data since weather was enabled in late 2006, but the new hobart only began logging data from 29 November 2008. It should also be noted that the weather conditions presented on the live page do not come from the MET3 sensor.

Edit - History - Print - Recent Changes - Search
Page last modified on November 29, 2008, at 05:23 AM