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<html lang="en"><head><meta charset="UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><title>Preprocessing · IceFloeTracker.jl</title><script data-outdated-warner src="../assets/warner.js"></script><link href="https://cdnjs.cloudflare.com/ajax/libs/lato-font/3.0.0/css/lato-font.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/juliamono/0.045/juliamono.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/fontawesome.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/solid.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/brands.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.13.24/katex.min.css" rel="stylesheet" type="text/css"/><script>documenterBaseURL=".."</script><script src="https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js" data-main="../assets/documenter.js"></script><script src="../siteinfo.js"></script><script src="../../versions.js"></script><link class="docs-theme-link" rel="stylesheet" type="text/css" href="../assets/themes/documenter-dark.css" data-theme-name="documenter-dark" data-theme-primary-dark/><link class="docs-theme-link" rel="stylesheet" type="text/css" href="../assets/themes/documenter-light.css" data-theme-name="documenter-light" data-theme-primary/><script src="../assets/themeswap.js"></script></head><body><div id="documenter"><nav class="docs-sidebar"><a class="docs-logo" href="../"><img src="../assets/logo.png" alt="IceFloeTracker.jl logo"/></a><div class="docs-package-name"><span class="docs-autofit"><a href="../">IceFloeTracker.jl</a></span></div><form class="docs-search" action="../search/"><input class="docs-search-query" id="documenter-search-query" name="q" type="text" placeholder="Search docs"/></form><ul class="docs-menu"><li><a class="tocitem" href="../">IceFloeTracker.jl</a></li><li class="is-active"><a class="tocitem" href>Preprocessing</a><ul class="internal"><li><a class="tocitem" href="#Land-masks"><span>Land masks</span></a></li><li><a class="tocitem" href="#Cloud-masks"><span>Cloud masks</span></a></li><li><a class="tocitem" href="#Image-regularization"><span>Image regularization</span></a></li></ul></li><li><a class="tocitem" href="../segmentation/">Segmentation</a></li><li><a class="tocitem" href="../tracking/">Tracking</a></li></ul><div class="docs-version-selector field has-addons"><div class="control"><span class="docs-label button is-static is-size-7">Version</span></div><div class="docs-selector control is-expanded"><div class="select is-fullwidth is-size-7"><select id="documenter-version-selector"></select></div></div></div></nav><div class="docs-main"><header class="docs-navbar"><nav class="breadcrumb"><ul class="is-hidden-mobile"><li class="is-active"><a href>Preprocessing</a></li></ul><ul class="is-hidden-tablet"><li class="is-active"><a href>Preprocessing</a></li></ul></nav><div class="docs-right"><a class="docs-edit-link" href="https://github.com/WilhelmusLab/IceFloeTracker.jl/blob/main/docs/src/preprocessing.md" title="Edit on GitHub"><span class="docs-icon fab"></span><span class="docs-label is-hidden-touch">Edit on GitHub</span></a><a class="docs-settings-button fas fa-cog" id="documenter-settings-button" href="#" title="Settings"></a><a class="docs-sidebar-button fa fa-bars is-hidden-desktop" id="documenter-sidebar-button" href="#"></a></div></header><article class="content" id="documenter-page"><h1 id="Preprocessing"><a class="docs-heading-anchor" href="#Preprocessing">Preprocessing</a><a id="Preprocessing-1"></a><a class="docs-heading-anchor-permalink" href="#Preprocessing" title="Permalink"></a></h1><p>IFT operates on optical satellite imagery. The main functions are designed with &quot;true color&quot; and &quot;false color&quot; imagery in mind, and have thus far primarily been tested on imagery from the Moderate Resolution Imaging Spectroradiometer (MODIS) from the NASA <em>Aqua</em> and <em>Terra</em> satellites. The preprocessing routines mask land and cloud features, and aim to adjust and sharpen the remainder of the images to amplify the contrast along the edges of sea ice floes. The functions use three different images: a land mask, a true color image, and a false color image. Examples are based on the NASA MODIS dataset.</p><h2 id="Land-masks"><a class="docs-heading-anchor" href="#Land-masks">Land masks</a><a id="Land-masks-1"></a><a class="docs-heading-anchor-permalink" href="#Land-masks" title="Permalink"></a></h2><p>Landmask generation and dilation is handled by the function <code>create_landmask</code>. Landmask images from file are loaded as RGB matrices. This example uses an image from NASA EarthData landmask for Beaufort Sea.</p><pre><code class="nohighlight hljs">using IceFloeTracker

rgb_landmask = IceFloeTracker.load(&lt;landmask_path&gt;);
landmask_imgs = IceFloeTracker.create_landmask(rgb_landmask);</code></pre><p>The landmask_imgs object includes a binary version of the original landmask and a dilated version, which helps to cover the complicated near-coastal regions.</p><img align="right" src="assets/landmask_example.png" width="300"><p>At the top, we have the original landmask TIFF, which has black and gray values. The middle image is the binary image, with land set to 0. At the bottom, we can see the dilated image using the default value of the structuring element. The default has radius 50, which results in a coastal mask of 12.5 km based on the 250 m pixel size of default MODIS imagery.</p><h2 id="Cloud-masks"><a class="docs-heading-anchor" href="#Cloud-masks">Cloud masks</a><a id="Cloud-masks-1"></a><a class="docs-heading-anchor-permalink" href="#Cloud-masks" title="Permalink"></a></h2><p>Setting thresholds for cloud mask</p><h2 id="Image-regularization"><a class="docs-heading-anchor" href="#Image-regularization">Image regularization</a><a id="Image-regularization-1"></a><a class="docs-heading-anchor-permalink" href="#Image-regularization" title="Permalink"></a></h2></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../">« IceFloeTracker.jl</a><a class="docs-footer-nextpage" href="../segmentation/">Segmentation »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 0.27.21 on <span class="colophon-date" title="Monday 9 December 2024 19:04">Monday 9 December 2024</span>. Using Julia version 1.7.3.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
landmask_imgs = IceFloeTracker.create_landmask(rgb_landmask);</code></pre><p>The landmask_imgs object includes a binary version of the original landmask and a dilated version, which helps to cover the complicated near-coastal regions.</p><img align="right" src="assets/landmask_example.png" width="300"><p>At the top, we have the original landmask TIFF, which has black and gray values. The middle image is the binary image, with land set to 0. At the bottom, we can see the dilated image using the default value of the structuring element. The default has radius 50, which results in a coastal mask of 12.5 km based on the 250 m pixel size of default MODIS imagery.</p><h2 id="Cloud-masks"><a class="docs-heading-anchor" href="#Cloud-masks">Cloud masks</a><a id="Cloud-masks-1"></a><a class="docs-heading-anchor-permalink" href="#Cloud-masks" title="Permalink"></a></h2><p>Setting thresholds for cloud mask</p><h2 id="Image-regularization"><a class="docs-heading-anchor" href="#Image-regularization">Image regularization</a><a id="Image-regularization-1"></a><a class="docs-heading-anchor-permalink" href="#Image-regularization" title="Permalink"></a></h2></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../">« IceFloeTracker.jl</a><a class="docs-footer-nextpage" href="../segmentation/">Segmentation »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 0.27.21 on <span class="colophon-date" title="Wednesday 11 December 2024 18:24">Wednesday 11 December 2024</span>. Using Julia version 1.7.3.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
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<html lang="en"><head><meta charset="UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><title>Search · IceFloeTracker.jl</title><script data-outdated-warner src="../assets/warner.js"></script><link href="https://cdnjs.cloudflare.com/ajax/libs/lato-font/3.0.0/css/lato-font.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/juliamono/0.045/juliamono.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/fontawesome.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/solid.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/brands.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.13.24/katex.min.css" rel="stylesheet" type="text/css"/><script>documenterBaseURL=".."</script><script src="https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js" data-main="../assets/documenter.js"></script><script src="../siteinfo.js"></script><script src="../../versions.js"></script><link class="docs-theme-link" rel="stylesheet" type="text/css" href="../assets/themes/documenter-dark.css" data-theme-name="documenter-dark" data-theme-primary-dark/><link class="docs-theme-link" rel="stylesheet" type="text/css" href="../assets/themes/documenter-light.css" data-theme-name="documenter-light" data-theme-primary/><script src="../assets/themeswap.js"></script></head><body><div id="documenter"><nav class="docs-sidebar"><a class="docs-logo" href="../"><img src="../assets/logo.png" alt="IceFloeTracker.jl logo"/></a><div class="docs-package-name"><span class="docs-autofit"><a href="../">IceFloeTracker.jl</a></span></div><form class="docs-search" action><input class="docs-search-query" id="documenter-search-query" name="q" type="text" placeholder="Search docs"/></form><ul class="docs-menu"><li><a class="tocitem" href="../">IceFloeTracker.jl</a></li><li><a class="tocitem" href="../preprocessing/">Preprocessing</a></li><li><a class="tocitem" href="../segmentation/">Segmentation</a></li><li><a class="tocitem" href="../tracking/">Tracking</a></li></ul><div class="docs-version-selector field has-addons"><div class="control"><span class="docs-label button is-static is-size-7">Version</span></div><div class="docs-selector control is-expanded"><div class="select is-fullwidth is-size-7"><select id="documenter-version-selector"></select></div></div></div></nav><div class="docs-main"><header class="docs-navbar"><nav class="breadcrumb"><ul class="is-hidden-mobile"><li class="is-active"><a href>Search</a></li></ul><ul class="is-hidden-tablet"><li class="is-active"><a href>Search</a></li></ul></nav><div class="docs-right"><a class="docs-settings-button fas fa-cog" id="documenter-settings-button" href="#" title="Settings"></a><a class="docs-sidebar-button fa fa-bars is-hidden-desktop" id="documenter-sidebar-button" href="#"></a></div></header><article><p id="documenter-search-info">Loading search...</p><ul id="documenter-search-results"></ul></article><nav class="docs-footer"><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 0.27.21 on <span class="colophon-date" title="Monday 9 December 2024 19:04">Monday 9 December 2024</span>. Using Julia version 1.7.3.</p></section><footer class="modal-card-foot"></footer></div></div></div></body><script src="../search_index.js"></script><script src="../assets/search.js"></script></html>
<html lang="en"><head><meta charset="UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><title>Search · IceFloeTracker.jl</title><script data-outdated-warner src="../assets/warner.js"></script><link href="https://cdnjs.cloudflare.com/ajax/libs/lato-font/3.0.0/css/lato-font.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/juliamono/0.045/juliamono.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/fontawesome.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/solid.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/brands.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.13.24/katex.min.css" rel="stylesheet" type="text/css"/><script>documenterBaseURL=".."</script><script src="https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js" data-main="../assets/documenter.js"></script><script src="../siteinfo.js"></script><script src="../../versions.js"></script><link class="docs-theme-link" rel="stylesheet" type="text/css" href="../assets/themes/documenter-dark.css" data-theme-name="documenter-dark" data-theme-primary-dark/><link class="docs-theme-link" rel="stylesheet" type="text/css" href="../assets/themes/documenter-light.css" data-theme-name="documenter-light" data-theme-primary/><script src="../assets/themeswap.js"></script></head><body><div id="documenter"><nav class="docs-sidebar"><a class="docs-logo" href="../"><img src="../assets/logo.png" alt="IceFloeTracker.jl logo"/></a><div class="docs-package-name"><span class="docs-autofit"><a href="../">IceFloeTracker.jl</a></span></div><form class="docs-search" action><input class="docs-search-query" id="documenter-search-query" name="q" type="text" placeholder="Search docs"/></form><ul class="docs-menu"><li><a class="tocitem" href="../">IceFloeTracker.jl</a></li><li><a class="tocitem" href="../preprocessing/">Preprocessing</a></li><li><a class="tocitem" href="../segmentation/">Segmentation</a></li><li><a class="tocitem" href="../tracking/">Tracking</a></li></ul><div class="docs-version-selector field has-addons"><div class="control"><span class="docs-label button is-static is-size-7">Version</span></div><div class="docs-selector control is-expanded"><div class="select is-fullwidth is-size-7"><select id="documenter-version-selector"></select></div></div></div></nav><div class="docs-main"><header class="docs-navbar"><nav class="breadcrumb"><ul class="is-hidden-mobile"><li class="is-active"><a href>Search</a></li></ul><ul class="is-hidden-tablet"><li class="is-active"><a href>Search</a></li></ul></nav><div class="docs-right"><a class="docs-settings-button fas fa-cog" id="documenter-settings-button" href="#" title="Settings"></a><a class="docs-sidebar-button fa fa-bars is-hidden-desktop" id="documenter-sidebar-button" href="#"></a></div></header><article><p id="documenter-search-info">Loading search...</p><ul id="documenter-search-results"></ul></article><nav class="docs-footer"><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 0.27.21 on <span class="colophon-date" title="Wednesday 11 December 2024 18:25">Wednesday 11 December 2024</span>. Using Julia version 1.7.3.</p></section><footer class="modal-card-foot"></footer></div></div></div></body><script src="../search_index.js"></script><script src="../assets/search.js"></script></html>
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