EAS221 Study Guide - Quiz Guide: Phenology, Digital Image, Supervised Learning

• School: University of Alberta
• Department: Earth and Atmospheric Sciences
• Course: EAS221
• Professor: Alberto Reyes

Document Summary

Healthy vegetation is seen as green because chlorophyll absorbs red and reflects green. In the visible spectrum, pigment absorption is the dominant process. In the nir spectrum, scattering is the dominant process. In the mid-ir spectrum, water absorption is the most important process. The re ult: (cid:862)gree(cid:374) peak(cid:863), (cid:862)chlorophyll (cid:449)ell(cid:863) a(cid:374)d (cid:862)red edge(cid:863) Vegetation indices: a radiometric measure of the abundance and activity of green vegetation. Difference indices: based on the difference between spectral response of veg and the soil background. Storm damage assessment: savi used to see where vegetation mortality occurred. Vegetation density service: could equip an automatic tractor with this info so it knows what to spray/water/harvest in what amounts. For mapping landcover: taking spectral info to classify each pixel into a land cover type. Supervised classification: a procedure for identifying (cid:862)trai(cid:374)i(cid:374)g(cid:863) sites of k(cid:374)o(cid:449)(cid:374) targets a(cid:374)d the(cid:374) extrapolating those spectral signatures to other areas of unknown targets.