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<!DOCTYPE HTML>
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<html>
<head>
<title>SpatioTemporal Asset Catalog</title>
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<header id="header" class="alt">
<span class="logo"><img src="images/logo/STAC-04.png" alt="" width="200"/></span>
<h1>SpatioTemporal Asset Catalogs</h1>
<p style="margin-bottom: 1em">Enabling online search and discovery of geospatial assets</p>
<ul class="icons" style="margin-bottom: 1em">
<li><a href="https://github.com/radiantearth/stac-spec" title="GitHub (code repository)" class="icon fa-github"><span class="label">GitHub</span></a></li>
<li><a href="https://gitter.im/SpatioTemporal-Asset-Catalog/Lobby" title="Gitter (chat)" class="icon fa-comments-o"><span class="label">Gitter</span></a></li>
<li><a href="https://groups.google.com/forum/#!forum/stac-spec" title="Google Groups (mailing list)" class="icon fa-envelope-o"><span class="label">Google Groups</span></a></li>
</ul>
</header>
<!-- Nav -->
<nav id="nav">
<ul>
<li><a href="#intro" class="active">Introduction</a></li>
<li><a href="#why">Why STAC?</a></li>
<li><a href="#core">STAC Specification</a></li>
<li><a href="#examples">STAC in Action</a></li>
<li><a href="#tools">STAC Tools</a></li>
<!-- <li><a href="#api">STAC API</a></li> -->
<li><a href="#community">Get Involved</a></li>
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<!-- Main -->
<div id="main">
<!-- Introduction -->
<section id="intro" class="main">
<div class="spotlight">
<div class="content">
<header class="major">
<h2>About</h2>
</header>
<p>The SpatioTemporal Asset Catalog (STAC) specification provides a common language to describe a range of geospatial information, so it can more easily be indexed and discovered. A 'spatiotemporal asset' is any file that represents information about the earth captured in a certain space and time. </p>
<p>The goal is for all providers of spatiotemporal assets (Imagery, SAR, Point Clouds, Data Cubes, Full Motion Video, etc) to expose their data as SpatioTemporal Asset Catalogs (<b>STAC</b>), so that new code doesn't need to be written whenever a new data set or API is released.</p>
<ul class="actions">
<li><a href="overview.html" class="button">Learn More</a></li>
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</div>
<span class="image"><img src="images/logo/STAC-03.png" alt="" /></span>
</div>
</section>
<!-- Why? -->
<section id="why" class="main special">
<header class="major">
<h2>Why does STAC Matter?</h2>
</header>
<ul class="features">
<li>
<span class="icon major style1 fa-cubes"></span>
<h3>Data Providers</h3>
<p>STAC is a standardized way to expose collections of spatial temporal data. If you are a provider of data about the earth in need of a cataloging your holdings, STAC is driving a uniform means for indexing assets.</p>
</li>
<li>
<span class="icon major style3 fa-wrench"></span>
<h3>Developers</h3>
<p>If you are building infrastructure to host, ingest, or manage collections of spatial data, STAC’s core JSON is the bare minimum needed to describe geospatial assets, and is extensible to customize to your domain.</p>
</li>
<li>
<span class="icon major style5 fas fa-users"></span>
<h3>Data Users</h3>
<p>Users of spatial temporal data are often burdened with building unique pipelines for each different collection of data they consume. The STAC community has defined this specification to remove this complexity and spur common tooling.</p>
</li>
</ul>
<footer class="major">
<ul class="actions">
<li><a href="why-stac.html" class="button">Learn More</a></li>
<li><a href="in-depth.html" class="button">The Vision</a></li>
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</ul>
</footer>
</section>
<!-- STAC Core -->
<section id="core" class="main special">
<header class="major">
<h2>STAC Specification</h2>
<p>The STAC Specification consists of 4 semi-independent specifications. Each can be used alone, but they work best in concert with one another.</p>
<p><ul style="display: inline-block; text-align: left;"><li><b><a href="https://github.com/radiantearth/stac-spec/blob/master/item-spec/item-spec.md">STAC Item</a></b> is the core atomic unit, representing a single spatiotemporal asset as a <a href="http://geojson.org">GeoJSON</a> feature plus datetime and links.</li>
<li><b><a href="https://github.com/radiantearth/stac-spec/blob/master/catalog-spec/catalog-spec.md">STAC Catalog</a></b> is a simple, flexible JSON file of links that provides a structure for to organize and browse STAC Items. A series of <a href="https://github.com/radiantearth/stac-spec/blob/master/catalog-spec/catalog-best-practices.md">best practices</a> helps make recommendations for creating real world STAC Catalogs.</li>
<li><b><a href="https://github.com/radiantearth/stac-spec/blob/master/collection-spec/collection-spec.md">STAC Collection</a></b> is an extension of the STAC Catalog with additional information such as the extents, license, keywords, providers, etc that describe STAC Items that fall within the Collection.</li>
<li><b><a href="https://github.com/radiantearth/stac-spec/tree/master/api-spec">STAC API</a></b> provides a RESTful endpoint that enables search of STAC Items, specified in <a href="https://www.openapis.org/">OpenAPI</a>, following <a href="https://opengeospatial.org">OGC</a>'s <a href="https://github.com/opengeospatial/WFS_FES">WFS 3</a>.</li>
</header>
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<li><a href="core.html" class="button">Learn More</a></li>
<li><a href="https://github.com/radiantearth/stac-spec" class="button special">Read the Spec</a></li>
<li><a href="https://stacspec.org/STAC-api.html" class="button">STAC OpenAPI</a></li>
</ul>
</footer>
</section>
<!-- examples -->
<section id="examples" class="main">
<header class="major">
<h2>STAC in action</h2>
<p>Several STAC Catalogs are live, including:</p>
<ul>
<li><a href="https://landsat.stac.cloud/">Landsat</a></li>
<li><a href="https://cbers.stac.cloud/">CBERS</a></li>
<li><a href="https://sentinel.stac.cloud/">Sentinel</a></li>
<li><a href="https://gee.stac.cloud/">Google Earth Engine (Collections Only)</a></li>
<li><a href="https://spacenet.stac.cloud/">Spacenet</a></li>
<li><a href="https://iserv.stac.cloud/">ISERV</a></li>
</ul>
<p> STAC is supported by an active community of developers, with involvement from a large range of organizations.
<img src="images/STAC_companies.png" width=90% />
</p>
<!--
<a href="https://www.digitalglobe.com/">Digital Globe</a>,
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<a href="https://www.harris.com/">Harris</a>,
<a href="https://earth.esa.int/web/guest/missions/3rd-party-missions/potential-missions/cbers">CBERS</a>,
<a href="https://developmentseed.org/">Development Seed</a>,
<a href="http://www.ga.gov.au/">Geoscience Australia</a>,
<a href="https://www.planet.com/">Planet</a>,
<a href="https://www.astraea.earth/">Astraea</a>, and
<a href="https://www.element84.com/">Element-84</a>.
-->
</header>
</section>
<!-- implementation Section -->
<section id="tools" class="main">
<header class="major">
<h2>STAC Tools</h2>
<p> A range of open-source tools help facilitate the use of the STAC spec, including: </p>
<ul>
<li><a href="https://github.com/radiantearth/stac-browser">STAC Browser</a> is a Vue-based browser for STAC catalogs.</li>
<li><a href="https://github.com/geospatial-jeff/cognition-datasources">Cognition</a> is a pluggable, STAC-compliant, proxy for searching geospatial assets.
<li><a href="https://github.com/sparkgeo/stac-validator">STAC Validator</a> is a python utility to validate STAC json files against the STAC spec or against local STAC extensions.
<li><a href="https://github.com/fredliporace/stac-crawler">Serverless STAC Crawler</a> is a static STAC crawler that runs on Lambda and SQS integration.
<li><a href="https://github.com/sat-utils">Sat-utils</a> is a set of utilities for searching/processing satellite data, including:
<ul>
<li><a href="https://github.com/sat-utils/sat-api">Sat-api</a> is a STAC compliant web API for searching and serving metadata for geospatial data.</li>
<li><a href="https://github.com/sat-utils/sat-search">Sat-search</a> is a Python 3 library and a command line tool for discovering and downloading publicly available satellite imagery.</li>
<li><a href="https://github.com/sat-utils/sat-stac">Sat-stac</a> is a Python 3 library for creating and working with STAC catalogs.</li>
<li><a href="https://github.com/sat-utils/sat-stats">Sat-stats</a> is a Python 3 library for calculating zonal statistics on images being stored remotely on S3.
<li><a href="https://github.com/sat-utils/sat-fetch">Sat-fetch</a> is a Python 2/3 library and command line tool for fetching, warping, and clipping remote imagery datasets.
</ul>
</ul>
<ul class="actions" align="center">
<li><a href="https://github.com/radiantearth/stac-spec/blob/master/implementations.md" class="button">Learn More</a></li>
</ul>
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</section>
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<h2>Get Involved!</h2>
<p>There are a variety of ways to get involved with STAC, from building software, creating new STAC Catalogs, working on the spec, or helping in outreach. We strive to be fully open, collaborative and welcoming community. The button below will take you to our 'How To Help' page. You can also just jump in to one of our communication forums:
<ul>
<li><a href="https://gitter.im/SpatioTemporal-Asset-Catalog/Lobby">Gitter chat</a></li>
<li><a href="https://github.com/radiantearth/stac-spec">GitHub</a></li>
<li><a href="https://groups.google.com/forum/#!forum/stac-spec">Google Groups</a></li>
</ul>
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<li><a href="how-to-help.html" class="button">Learn More</a></li>
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<h2>Pull Requests Accepted</h2>
<p>The SpatioTemporal Asset Catalog project and website is fully community driven. If you want to help with the project see our <a href="how-to-help.html">How To Help</a> page. If something is not right on the website, or you would like to add more information or help make it better please contribute on <a href="https://github.com/radiantearth/stac-site">GitHub</a>.</p>
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