http://www.scientificamerican.com/article.cfm?id=8-apps-that-turn-citizens-into-scientists
Secchi:Secchi is a mobile interface to the Secchi Disk project, which encourages mariners to participate in a global study of the phytoplankton in the sea. Phytoplankton support the marine food chain and scientists need help understanding the effects of climate change on their habitats.
How it works: Participants create a Secchi Disk, which is a tool to measurewater turbidity, and use it with the Secchi app. This simple piece of scientific equipment can be built using plywood, plastic or metal, painted white. Attached to a measuring tape, the Secchi Disk is lowered into the water until it disappears from sight—a process for estimating the amount of phytoplankton. The depth is then recorded on the Secchi app and uploaded to a database. Users must also indicate their location using the phone’s GPS to ensure accuracy of the observations. The measurements must be taken on sunny or partially sunny days, not on cloudy days.
Secchi:Secchi is a mobile interface to the Secchi Disk project, which encourages mariners to participate in a global study of the phytoplankton in the sea. Phytoplankton support the marine food chain and scientists need help understanding the effects of climate change on their habitats.
How it works: Participants create a Secchi Disk, which is a tool to measurewater turbidity, and use it with the Secchi app. This simple piece of scientific equipment can be built using plywood, plastic or metal, painted white. Attached to a measuring tape, the Secchi Disk is lowered into the water until it disappears from sight—a process for estimating the amount of phytoplankton. The depth is then recorded on the Secchi app and uploaded to a database. Users must also indicate their location using the phone’s GPS to ensure accuracy of the observations. The measurements must be taken on sunny or partially sunny days, not on cloudy days.