I caught up with one of my farming mates at the footy club tonight.

He definitely thinks this is a good idea. He also gave me some good insights:

• for example, some have weather logging devices on their headers (tractors) . But that only tells you whats going on where you already are...
• some paddocks would need more than one sensor - sometimes they measure the conditions then drive to the other side and things are different
• there is a community network where farmers are on the radio to each other. So perhaps there could be a 'cloud' layer over the top of the sensor network / farm base in the future...
• and of course you can buy remote water logging for troughs, for example, but they use the GSM/3G network - which means more SIM cards to maintain...
• with the fire danger there is the important 'delta T' calculation - more on that later