Summary: Life Under Your Feet
LUYF is a joint project with Katalin Szlavecz from JHU Department of Earth and Planetary
Sciences and Alex Szalay from JHU Department
of Physics & Astronomy. The purpose of the project is to use WSNs to study the environmental
conditions which affect soil respiration with fine spatial and temporal resolution.
Our deployments use the Koala data collection system to get data from the field to our
Life Under Your Feet is built for long-term data collection. It has loose data latency
requirements, but places a high value on data-recovery rates and long sensor lifetimes. To this
end, we use Koala, a reliable data retrieval system which operates at low radio duty cycles,
typically on the order of a few percent. Koala achieves this by using Low Power Probing (LPP)
to allow the network's nodes to spend the vast majority of their time with the radio off. Koala
periodically wakes up the entire network to download the data that nodes have collected and
stored locally, then return it to its sleeping state.
In the field, we have had nodes that survive for up to 2 years without battery replacement.
Recently, we have incorporated the Phoenix timestamp reconstruction system to increase data
usability and data compression to reduce storage and transfer requirements.
We have carried out several long-term deployments in the Baltimore area, as well as shorter
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