As part of the Grassroots Mapping Curriculum series.
http://publiclaboratory.org/notes/warren/6-...
Public Lab is an open community which collaboratively develops accessible, open source, Do-It-Yourself technologies for investigating local environmental health and justice issues.
*As part of the [Grassroots Mapping Curriculum](/wiki/mapping-curriculum) series.*
http://publiclaboratory.org/notes/warren/6-6-2011/using-multispectral-imagery-derive-bathymetry
http://publiclaboratory.org/notes/warren/6-5-2011/filter-pinwheel-multispectral-sensing
Public Lab is open for anyone and will always be free. By signing up you'll join a diverse group of community researchers and tap into a lot of grassroots expertise.