MikeyM,
Great project. I have worked to develop a system using the Senscomp Sensor and their 6500 Ranging module. You can see some details from our www.ohararp.com/blog.html
Recently a climatologist in Norway has asked us to add a Senscomp Ultrasonic Sensor and a simple temperature sensor to our SD GPS Data Logger to track snow depth measurement and glacial velocity movement on glaciers in the North Atlantic Region of the world. Using our skills we developed a quick prototype for initial testing at a fraction of the cost of traditional weather stations ($6K vs $400). We included a 10AH lithium ion battery and solar charging to boot! Let us know if you have a custom app that you would like us to look into! In the meantime enjoy the photos!
This was our intial version, but we are going to be adding some long range radio modules that are similar to the XBEE devices to your units. We then intend to serve this information to the ethernet with a simple serial to ethernet converter or possibly an FTP connection.