Source: USGS
A quote to note from this interview with Barbara Ryan:
“The data policy for Landsat was a paradigm shift for the world. There is no doubt about it.”

STELLA: A DIY Handheld Scientific Instrument
If you are looking for a do-it-yourself (DIY) handheld spectrometer, you need to meet STELLA. STELLA (Science and Technology Education for Land/Life Assessment) is a portable scientific instrument developed by