GEOG 330 Chapter 11 - GEOG 330 INTRODUCTION TO REMOTE...

Info iconThis preview shows pages 1–16. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: GEOG 330 INTRODUCTION TO REMOTE SENSING Ch 11 Remote Sensing of Vegetation Remote Sensing of Vegetation ! Monitoring of vegetation distribution, patterns, and change is critical if we are going to have insight into the balance of an ecosystems structure and function. ! Scientists have developed sensors and image processing algorithms to extract important biophysical characteristics of vegetation. ! Remote sensing techniques can be applied to a variety of vegetated landscapes including agriculture, forests, rangeland, wetland, and urban vegetation. Remote Sensing of Vegetation Vegetation Cover has a direct link to climate through the uptake of CO2 during photosynthesis and as a carbon sink both on the surface and in the soil. Remote Sensing of Vegetation Common Applications Assessment of Potentially Arable Lands Classification of Agricultural Lands Identification of Cultivated Crops Crop Area and Predications of Crop Yield Detection of Crop Damage Evaluation of Plant Diseases and Plant Health Forest Inventory and Health Forest Fuels Evaluations Forest Fire Impact Mapping Rangeland Health and Grazing Impacts Deforestation Global Agriculture Global Agriculture Global Agriculture Global Agriculture Minnesota Southern Brazil Bangkok Thailand Santa Cruz Bolivia NW Germany Kansas Global Agriculture Monitoring Change Santa Cruz de la Sierra Bolivia 1986 2001 Spectral Characteristics of Vegetation ! The electromagnetic energy incident on the plant leaf surface is reflected and absorbed for photosynthesis, or transmitted directly through the leaf onto other leaves or the ground beneath the canopy. ! Leaf pigments , Internal structure and water content are the dominant factors controlling the reflectance and transmittance properties of the leaves. Spectral Characteristics of Vegetation Water absorption bands: 0.97 ! m 1.19 ! m 1.45 ! m 1.94 ! m 2.70 ! m Leaf Structural Components ! The major leaf structural components determining the spectral reflectance of vegetation include the palisade mesophyll cells and the spongy mesophyll cells . ! These cross-sections through a hypothetical and real leaf reveal the major structural components that determine the spectral reflectance of vegetation. Visible Light Interaction with Pigments in the Palisade Cells ! Palisade cells contain chlorophyll pigments responsible for the absorption of the Blue and Red lights. ! Chlorophyll pigments produce a relatively lower absorption or higher reflection of the green light. ! This causes healthy foliage with a high chlorophyll content to appear green to our eyes. Visible Light Interaction with Pigments in the Palisade Cells ! Chlorophyll a shows two absorption peaks at 0.43 (blue) and 0.66 (red) ! m....
View Full Document

This note was uploaded on 01/16/2012 for the course GEOG 330 taught by Professor Marsh during the Fall '07 term at University of Arizona- Tucson.

Page1 / 81

GEOG 330 Chapter 11 - GEOG 330 INTRODUCTION TO REMOTE...

This preview shows document pages 1 - 16. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online