DEW3.3. Changes in Mt. St. Helens

{ Digital Earth Watch Contents } { All GSS Books } Use VegetationAnalysis software to observe and measure changes in Mt. St. Helens before and after the great eruption of 1980, AnalyzingDigitalImages software 3 images of Mt. St. Helens:MtStHelens_1973.jpegMtStHelens_1983.jpegMtStHelens_1996.jpeg The Tools 1. Launch the AnalyzingDigitalImages software and open the 3 images of Mt. St. Helens as time series. Calibration procedure […]

DEW3.2. What Has Been in Your Backyard?

{ Digital Earth Watch Contents } { All GSS Books } This investigation was developed by Becca Kranz and John Pickle. Materials and Preparation To do this activity you will need Access to the Internet or download all materials over the Internet first,  Familiarity with AnalyzingDigitalImages software and spreadsheet software,  Images of pollen maps in order to […]

DEW2.1. Spatial Analysis: Length

{ Digital Earth Watch Contents } { All GSS Books } Materials AnalyzingDigitalImages software  Plant Leaf with Ruler image (or any image including an object of known size such as a ruler to determine scale). Open An Image Start the AnalyzingDigitalImages software and open a picture by clicking on one of two options: “Open Picture” in the File […]

DEW1.6. Resolution and Pixel Color

{ Digital Earth Watch Contents } { All GSS Books } The number of pixels in an image tells you the picture’s resolution. More pixels means a higher resolution, allowing you to distinguish more details in the picture. The Pixels button of the software DigitalImageBasics can increase and decrease the resolution of the image, so that you […]

DEW1.4. Creating Colors

{ Digital Earth Watch Contents } { All GSS Books } Materials: Software: ColorBasics* Charts: Tri-color Creation Chart Tri-color Prediction Chart Tri-color Reference Chart *The author of ColorBasics software, John Pickle, has a website where you can find new web-based apps on his website’s Color Vision page: Detect Change in Color Detect Differences Between Colors […]

DEW2. Measuring With Digital Images

Chapter 2 { Digital Earth Watch Contents } I. The Power of Digital Images With the inventions of the computer and the Internet, many of us use digital cameras or cameras in smart phones as tools to record memories by capturing images of objects. But digital images are now more than just a way to […]

DEW1. Digital Image Basics

Chapter 1 { Digital Earth Watch Contents } Of our five senses, sight provides near-instantaneous information over a large range of distances and space. So it is no coincidence that people use a plethora of images to convey a rich variety of data: photographs, maps, drawings, paintings, movies, text documents, signs, etc. With the inventions […]

Digital Earth Watch

{ All GSS Books } The Digital Earth Watch (DEW) project grew from a NASA grant project titled Measuring Vegetation Health. Its goal was to teach about how monitoring the health of vegetation can be done at various scales: from individual plants to large scale ecosystems. Sensors capturing digital images provide crucial data at all […]

Software for GSS

Apps for Digital Earth Watch investigations and challenges Images to use with AnalyzingDigitalImages are in the materials lists of each investigation or challenge. Apps for A Changing Cosmos investigations Investigations that require image processing apps are marked with an asterisk in the Table of Contents for A Changing Cosmos. Links to required images are in […]

AC9.4. Counting Galaxies

Investigation AC9.4 { A Changing Cosmos Contents } [by Rich Lohman] Materials:   Hubble Deep-Field (HDF) image How many galaxies are there in the Universe?  You may have heard some numbers.  If you have (or even if you haven’t) write down a number right here that you think is the number of galaxies in the Universe.     […]