Digital Earth Watch

Contents

Chapters	Investigations	Challenges
1. Digital Image Basics	1.1 How Is Light Created? 1.2 LEDs As Light Sensors 1.3 Newsprint and Video Displays 1.4 Creating Colors 1.5 Dueling Beams of Light 1.6 Resolution and Pixel Color	1 Circle from 3 Cat’s True Colors
2. Measuring With Digital Images	2.1 Spatial Analysis: Length 2.2 Spatial Analysis: Area 2.3 Color in Surface Features 2.4 Take the Best Digital Photos 2.5 What Parent Do You Look Like?	Disappearing Sea
3. Analyzing Plants and Ecosystems	3.1 Observe Changing Vegetation (Adopt-a-Leaf/Branch & PicturePost) 3.2 In Your Backyard 3.3 Changes in Mt. St. Helens 3.4 IR Vision 3.5 Plant Stress Detector	How Tall is the Tree? Tree Diameter Pine Needle Length Tree Canopy Growth Leaf Area Plants Grow At Night?
4. Monitoring Earth Systems	4.1 Aerial Photography 4.2 The View from 400 Miles Up 4.3 Get Earth Images
Appendices:	DEW Partners Concept Mapping DEW Formative Evaluation DEW Program Evaluation The Future of DEW

DEW software for DEW Investigations

All Images for DEW Investigations (.zip file)

Overview

Sensors capturing digital images provide crucial data at all scales, from smart phones to Earth orbiting satellites that have provided stunning pictures of the Earth for decades. Those images have transformed people’s vision of their home planet and have enabled us to study Earth processes in ways that were not possible prior to the space age, thus creating a new field, known as Earth Systems Science. Underlying a mastery of the capture and analysis of digital images is an understanding of vision, light, and color.