GIS and Remote Sensing | MacMillan Center for International and Area Studies at Yale

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<style>.block-main-menu[aria-hidden=false]{display:block}.block-main-menu[aria-hidden=true]{display:none}</style> <style>.main-menu-toggle{display:var(--main-menu-toggle--display);height:21px;max-width:26px;min-width:26px}.main-menu-toggle span{color:var(--main-menu-toggle--color,#222);display:block;position:relative;width:75%}.main-menu-toggle span,.main-menu-toggle span:after,.main-menu-toggle span:before{background-color:currentColor;border-radius:100vw/100vw;height:2px;transition:all .2s ease-in-out}.main-menu-toggle span:after,.main-menu-toggle span:before{content:"";position:absolute;right:-25%;width:100%}.main-menu-toggle span:before{top:-8.5px}.main-menu-toggle span:after{bottom:-8.5px}.main-menu-toggle[aria-expanded=true] span{background:transparent;width:100%}.main-menu-toggle[aria-expanded=true] span:before{rotate:45deg;top:0}.main-menu-toggle[aria-expanded=true] 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span{text-wrap:nowrap}.group-archive-banner__text{margin-top:.5em}</style> <style>.animation-banner{margin-left:calc(-50vw + 50% - var(--scrollbar-width, 0px)/2*-1);margin-right:calc(-50vw + 50% - var(--scrollbar-width, 0px)/2*-1)}.animation-banner__content{margin:0 auto;max-width:1440px;padding-left:var(--safe-area-inline);padding-right:var(--safe-area-inline)}.animation-banner__cta-toggle{--_toggle-weight:1px;--_toggle-size:1rem;display:inline-block;margin-left:calc(var(--_toggle-size)*.5);position:relative;translate:0 -.125rem;width:calc(var(--_toggle-size)*.5)}.animation-banner__cta-toggle:after,.animation-banner__cta-toggle:before{background-color:var(--toggle-color,currentColor);border-bottom:var(--_toggle-weight) solid var(--toggle-color,currentColor);border-top:var(--_toggle-weight) solid var(--toggle-color,currentColor);content:"";display:block;height:0;position:absolute;right:0;top:var(--toggle-top,calc(50% - var(--_toggle-weight)));transition:all .2s ease-in-out,transform 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class="node__header" data-js="node-header"> <div class="node__header-content"> <h1 class="node__heading"> GIS and Remote Sensing </h1> </div> </header> <div class="node__content"> <div class="node__content-group"> <div class="node__sections"> <div class="layout--margin-bottom-sm layout--published layout layout--one-column"> <div class="layout__content"> <div class="layout__regions"> <div class="layout__region--gap-sm layout__region layout__region--first"> <div class="layout__region-item"> <div id="paragraph-html-content-27675" class="html-content" data-js="html-content"> <div class="html-content__body"> <div class="ck-content"><p>The primary benefit of <em>Geographic Information Systems </em>(GIS) is the ability to interrelate spatially multiple types of information assembled from a range of sources. These data do not necessarily have to be visual. GIS “shape files” are helpful for interpolating and visualizing many other types of data, e.g. demographic data. Many research models rely on the ability to analyze and extract information from images by using a variety of computer-available research tools and then express these findings as part of a project with images in a variety of layers and scenes.</p> <p>Remote sensing is the measurement of object properties on Earth’s surface using data acquired from aircraft and satellites. It attempts to measure something at a distance, rather than <em>in situ</em>, and, for research purposes, displays those measurements over a two-dimensional spatial grid, i.e. images. Remote-sensing systems, particularly those deployed on satellites, provide a repetitive and consistent view of Earth facilitating the ability to monitor the earth system and the effects of human activities on Earth. There are many <em>electromagnetic </em>(EM) band-length ranges that Earth’s atmosphere absorbs. The EM band ranges transmittable through Earth’s atmosphere are sometimes referred to as atmospheric windows.</p> <p>The human eye detects, through the reflective solar radiance humans actually see, only that part of the EM scale in the band length range 0.4 – 0.7 μm. But remote sensing technology allows for the detection of other reflective and radiant (e.g. thermal) energy band-length ranges that reach or are emitted by Earth’s surface, and even some that Earth’s atmosphere reflects, e.g. the EM reflective qualities of clouds. Hence, for viewing purposes, red, green, and blue (RGB) false color assignments are used to express the reflective qualities of objects in these EM band-length groups, and the combination and mixing of these false color assignments express the true physical reflective qualities of all objects present in an image.</p> <p>When utilizing satellite images to assess most types of land-cover change, primarily those involving change in vegetation coverage, variations in climate must be considered. For better control and accuracy in these analyses, comparing images acquired during the same month or season is advisable. But due to the limited availability of satellite images, obtaining materials corresponding both spatially and temporally to the location and period under research are not always possible. Furthermore, annual and seasonal climate data are not always available for the region or temporal period being researched. Sometimes, changes in average rainfall, temperature, etc. must be inferred using more macro regional or global data.</p> <p>One standard remote sensing application for detecting temporal change in land cover, especially vegetation, is the <em>Normalized Difference Vegetation Index </em>(NDVI). The NDVI application involves a ratio formula between the visual red and NIR EM bands. This ratio application helps to distinguish healthy and stronger vegetation reflection from other materials with similar reflective qualities in those EM band wavelength groups. NDVI applications are useful because two images can be processed into a false color composite, which allows for visual temporal change detection in vegetation coverage.</p> <p>Moreover, by applying standardized thresholds to multiple NDVI manipulated images, one can create classification training regions and execute supervised computer-generated classifications of multiple images. From these resulting images, area summary reports are calculated. These empirical data enable a more accurate assessment of change in area of the corresponding land-cover classes. More information on some of the above topics, as well as a more comprehensive description of some remote sensing technologies, and a glossary of terms, may be found in the 2009 GSP document, <a href="http://dev.gsp.yale.edu/sites/default/files/files/An-Introduction-to-Remote-Sensing-GIS-2009.pdf">“An Introduction to Remote Sensing and GIS</a>,” compiled by Russell Schimmer. </p> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> <div class="node__in-this-section"> </div> </div> </article> </div> </div> </main> <footer class="site-footer"> <div class="site-footer__group-connect-with"> <section class="group-connect-with"> <div class="group-connect-with__content"> <h2 class="group-connect-with__heading">Connect with Genocide Studies Program</h2> <div class="group-connect-with__link-container"> <div class="group-connect-with__newsletter-signup"> <a 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