{"id":3982,"date":"2023-04-18T16:33:57","date_gmt":"2023-04-18T16:33:57","guid":{"rendered":"https:\/\/skywatch.com\/?p=3982"},"modified":"2024-04-17T08:36:52","modified_gmt":"2024-04-17T08:36:52","slug":"what-are-indices","status":"publish","type":"post","link":"https:\/\/skywatch.com\/what-are-indices\/","title":{"rendered":"What are indices?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"3982\" class=\"elementor elementor-3982\" 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data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7203973 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7203973\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b22c85d\" data-id=\"b22c85d\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-55220ee elementor-widget elementor-widget-spacer\" data-id=\"55220ee\" data-element_type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div 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id=\"Content1\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3b5101e\" data-id=\"3b5101e\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1ffe9b1 elementor-widget elementor-widget-spacer\" data-id=\"1ffe9b1\" data-element_type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ec1cf33 elementor-widget elementor-widget-text-editor\" data-id=\"ec1cf33\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Indices are calculated using the multispectral bands<\/span><i><span style=\"font-weight: 400;\">. <\/span><\/i><span style=\"font-weight: 400;\">These calculations result in the outputs being in the form of an <\/span><i><span style=\"font-weight: 400;\">index<\/span><\/i><span style=\"font-weight: 400;\"> with values between 0-1. At the same time, the indices provide additional information about the ground surface being imaged.<br \/><br \/><\/span><span style=\"font-weight: 400;\">There are four EarthCache outputs that are under the indices umbrella: NDVI, MSAVI2, EVI and NDWI2.<\/span><\/p><h4><b>Normalized Difference Vegetation Index (NDVI)<\/b><\/h4><p><a href=\"https:\/\/skywatch.com\/the-ultimate-satellite-imagery-guide\/\"><span style=\"font-weight: 400;\">NDVI<\/span><\/a><span style=\"font-weight: 400;\"> is used to quantify vegetation greenness. Above all, it is useful in understanding vegetation density and assessing changes in plant health. The image output looks like this:\u00a0<\/span><\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-734\" src=\"https:\/\/skywatch.com\/wp-content\/uploads\/2022\/04\/12-300x300.png\" alt=\"\" width=\"300\" height=\"300\" \/><\/p><h4><b>Enhanced Vegetation Index (EVI)<\/b><\/h4><p><a href=\"https:\/\/skywatch.com\/the-ultimate-satellite-imagery-guide\/\"><span style=\"font-weight: 400;\">EVI <\/span><\/a><span style=\"font-weight: 400;\">is similar to Normalized Difference Vegetation Index (NDVI) and can be used to quantify vegetation greenness. However, EVI corrects for some atmospheric conditions and canopy background noise. It is also more sensitive in areas with dense vegetation.<\/span><\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3947\" src=\"https:\/\/skywatch.com\/wp-content\/uploads\/2023\/04\/HQuMWTj5zWG0GSNUHhIzrky85yP-dRJ8dbzuA5FzXuRey0zrqwN1bFpmfg2gAZsoF-Drgk28OsIgMCNKN7f2Jj6x-7CFwopZQMMEN3SnsnyhB0qvk22sDTKkQibU-300x300.webp\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/skywatch.com\/wp-content\/uploads\/2023\/04\/HQuMWTj5zWG0GSNUHhIzrky85yP-dRJ8dbzuA5FzXuRey0zrqwN1bFpmfg2gAZsoF-Drgk28OsIgMCNKN7f2Jj6x-7CFwopZQMMEN3SnsnyhB0qvk22sDTKkQibU-300x300.webp 300w, https:\/\/skywatch.com\/wp-content\/uploads\/2023\/04\/HQuMWTj5zWG0GSNUHhIzrky85yP-dRJ8dbzuA5FzXuRey0zrqwN1bFpmfg2gAZsoF-Drgk28OsIgMCNKN7f2Jj6x-7CFwopZQMMEN3SnsnyhB0qvk22sDTKkQibU-150x150.webp 150w, https:\/\/skywatch.com\/wp-content\/uploads\/2023\/04\/HQuMWTj5zWG0GSNUHhIzrky85yP-dRJ8dbzuA5FzXuRey0zrqwN1bFpmfg2gAZsoF-Drgk28OsIgMCNKN7f2Jj6x-7CFwopZQMMEN3SnsnyhB0qvk22sDTKkQibU-768x770.webp 768w, https:\/\/skywatch.com\/wp-content\/uploads\/2023\/04\/HQuMWTj5zWG0GSNUHhIzrky85yP-dRJ8dbzuA5FzXuRey0zrqwN1bFpmfg2gAZsoF-Drgk28OsIgMCNKN7f2Jj6x-7CFwopZQMMEN3SnsnyhB0qvk22sDTKkQibU.webp 818w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p><h4><b>Second Modified Soil Adjusted Vegetation Index (MSAVI2)<\/b><\/h4><p><a href=\"https:\/\/skywatch.com\/the-ultimate-satellite-imagery-guide\/\"><span style=\"font-weight: 400;\">MSAVI2 <\/span><\/a><span style=\"font-weight: 400;\">is a radiometric index using the near-infrared and red bands. Its outputs are often used to monitor vegetation cover, biomass, and leaf area index. They can also be used as an input layer for mapping land cover or vegetation classes.<\/span><\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-735\" src=\"https:\/\/skywatch.com\/wp-content\/uploads\/2022\/04\/13-300x300.png\" alt=\"MAVI2 indices\" width=\"300\" height=\"300\" \/><\/p><h4><b>Normalized Difference Water Index (NDWI2)<\/b><\/h4><p><a href=\"https:\/\/skywatch.com\/the-ultimate-satellite-imagery-guide\/\"><span style=\"font-weight: 400;\">NDWI2<\/span><\/a><span style=\"font-weight: 400;\"> is a normalized index of the water content in an image. The output NDWI2 can be interpreted similarly to NDVI: the closer to a pixel value of 1, the more likely the pixel is to be water or water-saturated. NDWI2 is calculated by a ratio of the near infrared band and shortwave infrared bands.<\/span><\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-736\" src=\"https:\/\/skywatch.com\/wp-content\/uploads\/2022\/04\/14-300x300.png\" alt=\"NDWI2 indices\" width=\"300\" height=\"300\" \/><\/p><p><b>When are indices used?<\/b><span style=\"font-weight: 400;\"><br \/><\/span><span style=\"font-weight: 400;\">Each of the indices can be useful for different purposes.<\/span><\/p><p><span style=\"font-weight: 400;\">NDVI &#8211; Often used to assist with vegetation monitoring as it can better detect the health of vegetation when compared to visual analysis. It also is very good at differentiating between vegetated and non-vegetated land. As such it is often used for crop and forest monitoring.<\/span><\/p><p><span style=\"font-weight: 400;\">MSAVI2 &#8211; Similar to NDVI but better accounts for bare soil. It is often used for vegetation monitoring in areas with more exposed soil or during the early stages of crop development. It can also be used for desertification monitoring.<\/span><\/p><p><span style=\"font-weight: 400;\">EVI &#8211; Similar to NDVI but is an enhanced index which better accounts for atmospheric interference. It has improved sensitivity over dense canopy which can be very useful for monitoring vegetation changes over heavily forested areas.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">NDWI2 &#8211; Can be useful for monitoring the changes that occur to waterbodies over time, since it is very good at distinguishing between water, and surrounding land. This can be useful for drought and flood monitoring.<\/span><\/p><p><span style=\"font-weight: 400;\">If you would like to expand your knowledge on indices, <\/span><a href=\"https:\/\/skywatch.com\/satellite-image-outputs-and-their-applications\/\"><span style=\"font-weight: 400;\">our article<\/span><\/a><span style=\"font-weight: 400;\"> discussing the possibilities of satellite imagery outputs and their practical uses is a great place to start!<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-566b8d4 elementor-widget elementor-widget-spacer\" data-id=\"566b8d4\" data-element_type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-393a78f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"393a78f\" data-element_type=\"section\" id=\"Content2\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b81f8a5\" data-id=\"b81f8a5\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-92d1aa2 elementor-widget elementor-widget-menu-anchor\" data-id=\"92d1aa2\" data-element_type=\"widget\" data-widget_type=\"menu-anchor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-menu-anchor\" id=\"Watch\"><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-99b3401 elementor-widget elementor-widget-video\" data-id=\"99b3401\" data-element_type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/www.youtube.com\\\/watch?v=ZXMjDuNxIRQ&amp;list=PLm0qla9oBgYO5arH_nczjPDQ7FzsvSB28&amp;index=16&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-58afa8c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"58afa8c\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4073399\" data-id=\"4073399\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c23e0cc hidden elementor-widget elementor-widget-html\" data-id=\"c23e0cc\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style> \n.elementor-editor-active .hidden { \n    display:block; 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These calculations result in the outputs being in the form of an index with values between 0-1. At the same time, the indices provide additional information about the ground surface being imaged.<\/p>\n","protected":false},"author":11,"featured_media":3942,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[313],"tags":[321,319,320],"class_list":["post-3982","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-what-is-series","tag-index","tag-indices","tag-what-are-indices"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/skywatch.com\/wp-json\/wp\/v2\/posts\/3982","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/skywatch.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/skywatch.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/skywatch.com\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/skywatch.com\/wp-json\/wp\/v2\/comments?post=3982"}],"version-history":[{"count":3,"href":"https:\/\/skywatch.com\/wp-json\/wp\/v2\/posts\/3982\/revisions"}],"predecessor-version":[{"id":989439,"href":"https:\/\/skywatch.com\/wp-json\/wp\/v2\/posts\/3982\/revisions\/989439"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/skywatch.com\/wp-json\/wp\/v2\/media\/3942"}],"wp:attachment":[{"href":"https:\/\/skywatch.com\/wp-json\/wp\/v2\/media?parent=3982"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/skywatch.com\/wp-json\/wp\/v2\/categories?post=3982"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/skywatch.com\/wp-json\/wp\/v2\/tags?post=3982"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}