Source: USGS
A quote to note from Wulder on looking at historic land cover change:
“Anything that’s historic, it’s got to be Landsat. In temporal depth, Landsat is really the only game in town.”

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