{"id":178331,"date":"2018-05-14T21:14:45","date_gmt":"2018-05-14T21:14:45","guid":{"rendered":"http:\/\/www.esri.com\/arcgis-blog\/?post_type=blog&#038;p=178331"},"modified":"2018-05-14T21:14:45","modified_gmt":"2018-05-14T21:14:45","slug":"hawaii-puerto-rico-guam-virgin-islands-added-hydrology-analysis","status":"publish","type":"blog","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-living-atlas\/analytics\/hawaii-puerto-rico-guam-virgin-islands-added-hydrology-analysis","title":{"rendered":"Hawaii, Puerto Rico, Guam, and the U.S. Virgin Islands added to Hydrology Analysis Services"},"author":5221,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_searchwp_excluded":""},"categories":[23341,22771,23051],"tags":[24141,24981],"industry":[],"product":[36581,36551,36561,37031],"class_list":["post-178331","blog","type-blog","status-publish","format-standard","hentry","category-analytics","category-natural-resources","category-water","tag-elevation","tag-hydro","product-arcgis-living-atlas","product-arcgis-online","product-arcgis-pro","product-spatial-analyst"],"acf":{"short_description":"A new, 10-meter resolution DEM enables watershed delineation and downstream trace in overseas U.S. territories and the Hawaiian islands.","flexible_content":[{"acf_fc_layout":"content","content":"<p>One of the core layers the Living Atlas of the World provides is a digital elevation model (DEM) of the planet. These data are shared as <a href=\"http:\/\/www.arcgis.com\/home\/item.html?id=1536abe5e5504e5db380ccfaa9b6fd8d\">cached basemaps<\/a> and as an <a href=\"http:\/\/www.arcgis.com\/home\/item.html?id=58a541efc59545e6b7137f961d7de883\">image service<\/a>, as well through a <a href=\"http:\/\/www.arcgis.com\/home\/group.html?id=bbc5f50839094e9d8dc5255b6a7783dd\">suite of analysis tools<\/a> you can use directly against the hosted data. The Hydrology Analysis Tools \u2013 Delineate Watershed and Trace Downstream \u2013 use elevation to help you understand hydrologic connectivity across the landscape. These are foundational services with applications in natural resource management, ecology, public health, and disaster response. For example, when a waterborne contaminant is found at a particular location, you can use these tools to narrow down the upstream area it could have come from, and chart where it will flow next. Users can perform these analytical tasks quickly and easily without having to collect, maintain, or update terabytes of base data on local machines. The data is already preprocessed, optimized for fast web service performance, and is readily accessible across the ArcGIS platform.<\/p>\n"},{"acf_fc_layout":"image","image":{"ID":178411,"id":178411,"title":"HydrologyCoverage","filename":"map1.png","filesize":124349,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/map1.png","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-living-atlas\/analytics\/hawaii-puerto-rico-guam-virgin-islands-added-hydrology-analysis\/map1","alt":"Hydrology Tools Coverage","author":"5221","description":"Coverage of Hydrology Analysis Tools","caption":"Coverage of Hydrology Analysis Tools","name":"map1","status":"inherit","uploaded_to":178331,"date":"2018-05-11 21:44:32","modified":"2018-05-11 21:44:58","menu_order":0,"mime_type":"image\/png","type":"image","subtype":"png","icon":"https:\/\/www.esri.com\/arcgis-blog\/wp-includes\/images\/media\/default.png","width":1021,"height":680,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/map1.png","thumbnail-width":213,"thumbnail-height":142,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/map1.png","medium-width":392,"medium-height":261,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/map1.png","medium_large-width":768,"medium_large-height":511,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/map1.png","large-width":1021,"large-height":680,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/map1.png","1536x1536-width":1021,"1536x1536-height":680,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/map1.png","2048x2048-width":1021,"2048x2048-height":680,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/map1.png","card_image-width":698,"card_image-height":465,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/map1.png","wide_image-width":1021,"wide_image-height":680}},"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"<p>Globally this analysis is based on the 90-meter resolution <a href=\"http:\/\/www.hydrosheds.org\/\">HydroSHEDs DEM<\/a>, and in the United States the tools also take advantage of the 30-meter resolution\u00a0<a href=\"http:\/\/www.horizon-systems.com\/NHDPlus\/NHDPlusV2_home.php\">National Hydrography Dataset<\/a>. However, some islands remain too small to represent with these datasets, even making use of the increased resolution of the NHD. Now that the USGS has <a href=\"https:\/\/nhd.usgs.gov\/NHDPlus_HR.html\">begun releasing<\/a> 10-meter resolution, hydrologically-enforced DEMs for the United States, we can finally add support in Hawaii, Puerto Rico, Guam, and the U.S. Virgin Islands. This is the first 10-meter resolution data to be incorporated into our Hydrology Services.<\/p>\n"},{"acf_fc_layout":"content","content":"<h1>How to use them<\/h1>\n<p>These tools can be used by any application in the ArcGIS platform. If you are developing an application of your own, you can use the <a href=\"https:\/\/developers.arcgis.com\/rest\/elevation\/api-reference\/get-started-with-elevation-services.htm\">REST API<\/a> to incorporate them into your project as well.<\/p>\n<p>In ArcGIS Online, just press the \u2018Perform Analysis\u201d button and click \u201cFind Locations.\u201d The tool lets you input a set of points, or you can just click on the map on your point of interest.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/tools2.png\" alt=\"Ready-to-Use Services\" width=\"306\" height=\"200\" align=\"Right\" \/>In ArcGIS Pro, these analysis services are accessible as Ready-To-Use Services in the Analysis ribbon.\u00a0Ready-To-Use Services give direct access to ArcGIS Online analysis services such as Network Analysis Services as well as elevation and hydrology services. Access them by logging in to any ArcGIS Online organizational account. These tools can be used directly in ModelBuilder models and Python scripts just like any other\u00a0geoprocessing tool.<\/p>\n<p>In ArcMap, you can find them at the bottom of the Catalog window. Expand Ready-To-Use Services, click the Elevation connection, and then the Tools folder, and Elevation toolbox. A pop-window will prompt you to log in.<\/p>\n"},{"acf_fc_layout":"content","content":"<h1>How much they cost<\/h1>\n<p>These services require that you have an ArcGIS Online account with credits available to you. For every thousand features you input to the tool, one credit will be deducted from your account.<\/p>\n"}],"authors":[{"ID":5221,"user_firstname":"Daniel","user_lastname":"Siegel","nickname":"Daniel","user_nicename":"daniel-siegel","display_name":"Daniel Siegel","user_email":"DSiegel@esri.com","user_url":"","user_registered":"2018-03-02 00:16:52","user_description":"Daniel is curator of Earth Observations content for the Living Atlas of the World. He first joined Esri in 2012 after studying water resource engineering at the University of Texas. An avid backpacker and rock climber, he is passionate about environmental conservation and wilderness protection.","user_avatar":"<img data-del=\"avatar\" src='https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/circle.png' class='avatar pp-user-avatar avatar-96 photo ' height='96' width='96'\/>"}],"related_articles":[{"ID":79631,"post_author":"5221","post_date":"2017-09-25 15:47:58","post_date_gmt":"2017-09-25 15:47:58","post_content":"","post_title":"Explore Climate Trends with the Water Balance App","post_excerpt":"","post_status":"publish","comment_status":"open","ping_status":"closed","post_password":"","post_name":"explore-climate-trends-with-the-water-balance-app","to_ping":"","pinged":"","post_modified":"2018-03-26 21:14:53","post_modified_gmt":"2018-03-26 21:14:53","post_content_filtered":"","post_parent":0,"guid":"http:\/\/www.esri.com\/arcgis-blog\/products\/product\/uncategorized\/explore-climate-trends-with-the-water-balance-app\/","menu_order":0,"post_type":"blog","post_mime_type":"","comment_count":"0","filter":"raw"},{"ID":123381,"post_author":"5221","post_date":"2018-03-15 12:53:58","post_date_gmt":"2018-03-15 12:53:58","post_content":"Just because you can\u2019t see evapotranspiration doesn\u2019t mean you can\u2019t map it. In fact, the Living Atlas of the World has long contained data about average annual evapotranspiration for the United States. Today that map is being deprecated and replaced by two global versions that show evaporative losses everywhere on Earth.\n\n<!--more-->\n<ul>\n\t<li><a href=\"http:\/\/www.arcgis.com\/home\/item.html?id=31f7c3727abf42249a43fe8f25470af4\">Actual Evapotranspiration<\/a><\/li>\n\t<li><a href=\"http:\/\/www.arcgis.com\/home\/item.html?id=718429fe190648ad89729b45e37e0aa2\">Potential Evapotranspiration<\/a><\/li>\n<\/ul>\n\n<div>\n\nEvapotranpsiration is the measure of evaporative losses from the landscape. It includes both direct evaporation from lakes and soil, and transpiration, which is when plants take water up through their roots and release it from their leaves. Over 61% of rainfall is lost to evapotranspiration, so mapping its variance is an important part of understanding the global water cycle.\n\n[caption id=\"\" align=\"alignnone\" width=\"800\"]<img src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/03\/et_pet.png\" alt=\"Actual ET vs Potential ET\" width=\"800\" height=\"270\" \/> Actual ET vs Potential ET in Africa[\/caption]\n\nPotential evapotranspiration is the amount of evapotranspiration that would occur if water availability were unlimited. It is a meteorological variable that depends only on air temperature and solar radiation. So, for example, Scotland and Norway have a lower rate of evapotranspiration than the Congo, despite receiving just as much rain, because potential evapotranspiration is lower. There is not enough solar energy to vaporize all the water. Conversely, the Sahara Desert has a very high potential evapotranspiration, but receives little rain, so actual evapotranspiration is low and the unused solar energy heats the sand to over 170 degrees Fahrenheit. In the Congo River Basin, there is high potential evapotranspiration and ample precipitation, so less of the potential goes unused. The result is high actual evapotranspiration and a much more humid climate with abundant plant life.\n\n\nThese layers were built using the <a href=\"http:\/\/www.ntsg.umt.edu\/project\/modis\/mod16.php\">MOD16<\/a> Global Evapotranspiration Product, which is derived from satellite imagery by researchers at the <a href=\"http:\/\/www.ntsg.umt.edu\/\">University of Montana<\/a>. Imagery is from the Moderate Resolution Imaging Spectroradiometer (MODIS), an instrument with 1-km resolution first launched in 1999 and carried by two NASA satellites. The MOD16 <a href=\"http:\/\/citeseerx.ist.psu.edu\/viewdoc\/download?doi=10.1.1.472.5247&amp;rep=rep1&amp;type=pdf\">algorithm<\/a> derives from raw imagery a number of secondary data products like land surface albedo, leaf area index, and net solar radiation. These intermediate data are used to solve the <a href=\"http:\/\/edis.ifas.ufl.edu\/pdffiles\/ae\/ae45900.pdf\">Penman-Monteith equation<\/a> for total daily evapotranspiration, which is then aggregated into 8-day, monthly, and annual intervals. We calculated the average annual evapotranspiration over the 15 year period of record (2000 \u2013 2014), both in terms of actual and potential ET, in order to build the layers above. If you want to access the monthly data, a toolbox you can use is <a href=\"modis.danielsiegel.co\">available here<\/a>.\n\n[caption id=\"\" align=\"alignright\"  width=\"205\"]<img src=\"http:\/\/downloads.esri.com\/blogs\/hydro\/ET\/Fig0.jpg\" alt=\"ET with hillshade\" width=\"205\" height=\"139\" \/> ET with hillshade[\/caption]\n\n<strong>\nWhat can you do with this data?<\/strong>\n\nThese layers are image services, so they can be used as input by your geoprocessing tools in Desktop. The \"Zonal Statistics as Table\" tool is particularly useful for calculating evaporative losses over a watershed, which is the first step towards calculating the water balance. If you subtract annual evapotranspiration from the annual rainfall you have a good estimate of <a href=\"https:\/\/www.arcgis.com\/home\/item.html?id=0235ef1b29194366a46a1ffbdd703923\">available water<\/a>, the sustainable supply of a watershed that must be split between human use, freshwater ecosystems, and groundwater recharge. For visualization purposes there is also a <a href=\"http:\/\/www.arcgis.com\/home\/item.html?id=ad3f8cc18fc74e6894ee220acd15020a\">cached version<\/a> of this map that has a hillshade burned in. When combined with the <a href=\"http:\/\/www.arcgis.com\/home\/item.html?id=9f86716d941c4410b0b406d911754b2c\">Hydro Reference Overlay<\/a> it can be used to create a particularly beautiful basemap.\n\n<\/div>","post_title":"Global Evapotranspiration Data Added to Living Atlas","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"global-evapotranspiration-data-added-to-living-atlas","to_ping":"","pinged":"","post_modified":"2018-07-19 11:10:31","post_modified_gmt":"2018-07-19 18:10:31","post_content_filtered":"","post_parent":0,"guid":"http:\/\/www.esri.com\/arcgis-blog\/products\/product\/uncategorized\/global-evapotranspiration-data-added-to-living-atlas\/","menu_order":0,"post_type":"blog","post_mime_type":"","comment_count":"0","filter":"raw"},{"ID":80831,"post_author":"4911","post_date":"2017-12-08 14:24:34","post_date_gmt":"2017-12-08 14:24:34","post_content":"","post_title":"What\u2019s new with the SSURGO Downloader?","post_excerpt":"","post_status":"publish","comment_status":"open","ping_status":"closed","post_password":"","post_name":"whats-new-with-the-ssurgo-downloader","to_ping":"","pinged":"","post_modified":"2020-07-06 17:55:52","post_modified_gmt":"2020-07-07 00:55:52","post_content_filtered":"","post_parent":0,"guid":"http:\/\/www.esri.com\/arcgis-blog\/products\/product\/uncategorized\/whats-new-with-the-ssurgo-downloader\/","menu_order":0,"post_type":"blog","post_mime_type":"","comment_count":"2","filter":"raw"},{"ID":81881,"post_author":"4051","post_date":"2018-01-17 17:40:15","post_date_gmt":"2018-01-17 17:40:15","post_content":"","post_title":"What\u2019s New for Spatial Analyst in ArcGIS Pro 2.1 and ArcMap 10.6.","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"whats-new-for-spatial-analyst-in-arcgis-pro-2-1-and-arcmap-10-6","to_ping":"","pinged":"","post_modified":"2018-03-28 23:03:49","post_modified_gmt":"2018-03-28 23:03:49","post_content_filtered":"","post_parent":0,"guid":"http:\/\/www.esri.com\/arcgis-blog\/products\/product\/uncategorized\/whats-new-for-spatial-analyst-in-arcgis-pro-2-1-and-arcmap-10-6\/","menu_order":0,"post_type":"blog","post_mime_type":"","comment_count":"0","filter":"raw"}],"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/card.png","wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/05\/banner2.png"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v25.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hawaii, Puerto Rico, Guam, and the U.S. Virgin Islands added to Hydrology Analysis Services<\/title>\n<meta name=\"description\" content=\"A new, 10-meter resolution DEM enables watershed delineation and downstream trace in overseas U.S. territories and the Hawaiian islands.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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