{"id":639202,"date":"2023-12-18T09:09:59","date_gmt":"2023-12-18T17:09:59","guid":{"rendered":"https:\/\/www.esri.com\/about\/newsroom\/?post_type=arcwatch&p=639202"},"modified":"2023-12-18T09:09:59","modified_gmt":"2023-12-18T17:09:59","slug":"make-a-coral-bleaching-map-in-arcgis-online","status":"publish","type":"arcwatch","link":"https:\/\/www.esri.com\/about\/newsroom\/arcwatch\/make-a-coral-bleaching-map-in-arcgis-online","title":{"rendered":"Make a Coral Bleaching Map in ArcGIS Online"},"content":{"rendered":"","protected":false},"author":8132,"featured_media":0,"menu_order":0,"template":"","format":"standard","meta":{"_acf_changed":false,"sync_status":"","episode_type":"","audio_file":"","castos_file_data":"","podmotor_file_id":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[10392],"tags":[201102,163382,487752,487762,482742],"arcwatch_issues":[487482],"class_list":["post-639202","arcwatch","type-arcwatch","status-publish","format-standard","hentry","category-arcgis-online","tag-arcgis-living-atlas","tag-arcgis-online","tag-coral-bleaching","tag-sea-temperature","tag-tip","arcwatch_issues-december-2023","arcwatch_sections-the-tip"],"acf":{"short_description":"Learn to make a sea temperature and coral bleaching map in a minute using ArcGIS Online and ArcGIS Living Atlas of the World.","pdf":{"host_remotely":false,"file":"","file_url":""},"flexible_content":[{"acf_fc_layout":"content","content":"Coral is highly sensitive to temperature, and while temperatures in the mid 80s can be the norm, surges in temperature cause coral to \u201cbleach<\/a>,\u201d expelling symbiotic algae and turning white. While bleaching doesn\u2019t necessarily kill coral, it does mean they are stressed and subject to increased mortality, especially as warmer-than-normal temperatures persist.\r\n\r\nOne of the first steps in solving a problem like this is by having a better understanding of where and how sea temperatures and coral bleaching interact. Fortunately, ArcGIS Living Atlas of the World<\/a>\u00a0includes authoritative content that helps you learn more about current sea temperature and coral bleaching.\r\n\r\nIn this tip, you will make your own sea surface temperature and coral bleaching map in a minute.\r\n\r\nMake a Sea Surface Temperature and Coral Bleaching Map<\/strong>\r\n\r\nStep 1:<\/strong> Sign in to your ArcGIS account and open Map Viewer. There are two ways to add layers from the Content (dark) toolbar:\r\n\r\n(1) Click\u00a0Add, then\u00a0Browse layers."},{"acf_fc_layout":"image","image":639232,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"or (2) Click\u00a0Layers, then\u00a0Add."},{"acf_fc_layout":"image","image":639242,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"Step 2:<\/strong> Choose\u00a0Living Atlas\u00a0from the Add layer drop-down menu."},{"acf_fc_layout":"image","image":639252,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"Step 3:<\/strong> Enter \u201csea temperature\u201d in search to locate matching layers from Living Atlas. Locate the\u00a0HYCOM\u2014Sea Water Temperature\u00a0layer and click\u00a0[+ Add]\u00a0to add it to the map."},{"acf_fc_layout":"image","image":639262,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"Tip:\u00a0To learn more about any layer, click the layer card to\u00a0view the item information, such as overview, description, and more. Click\u00a0View item\u00a0at the bottom to open the full item pages."},{"acf_fc_layout":"image","image":639272,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"From the\u00a0HYCOM \u2013 Sea Water Temperature<\/a>\u00a0item details, we learn that the layer shows a seven-day forecast and 30-day hindcast from the Hybrid Coordinate Ocean Model (HYCOM). The multidimensional imagery layer provides information on a variety of variables, including temperature, temperature at specific depths, and more.\r\n\r\nAfter adding the layer,\u00a0a time slider will appear showing the time range encompassing the 30-day hindcast to the seven-day forecast. Click the layer to view the pop-up. By default, the layer displays the information recorded for 30 days ago (the hindcast) and the temperature at the surface."},{"acf_fc_layout":"image","image":639282,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"Next, we\u2019ll adjust the HYCOM layer settings to show the temperature for the current date, and since temperature at the surface is typically warmer than below, we\u2019ll adjust the depth to show the temperature about 10 to 15 feet below the surface.\r\n\r\nStep 4:<\/strong> Open the\u00a0Multidimensional\u00a0tool from the Settings (light) toolbar."},{"acf_fc_layout":"image","image":639292,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"The pane shows the display slice variables, including (a) a time dimension slider and (b) the Z dimension slider, which in this case is depth below surface."},{"acf_fc_layout":"image","image":639302,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"Step 5:<\/strong>\u00a0Adjust the time slider by using the left\/right arrows or grab and move the time slider control to set the current date and time."},{"acf_fc_layout":"image","image":639312,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"Step 6:<\/strong> Adjust the Z dimension (depth below surface) slider using the up\/down arrows or use the slider control to set it to -4 meters, roughly 10 to 15 feet below the ocean surface where coral may be growing."},{"acf_fc_layout":"image","image":639322,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"Click\u00a0Done\u00a0when finished. You can verify the settings you have made by opening the pop-up to show the temperature at the specified depth and current date.\r\n\r\nIn the next steps, we\u2019ll add the coral bleaching layer.\r\n\r\nStep 7:<\/strong> Add another layer from Living Atlas (see Steps 1 and 2 above) and enter \u201ccoral\u201d in search to locate matching layers from Living Atlas. Locate the\u00a0NOAA Coral Reef Watch (CRW) Virtual Stations\u00a0layer and click\u00a0[+ Add]\u00a0to add it to the map."},{"acf_fc_layout":"image","image":639332,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"To learn more about the layer, click the layer card to\u00a0view the item information, such as overview, description, and more. Click\u00a0View item\u00a0at the bottom to open the full item pages."},{"acf_fc_layout":"image","image":639342,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"From the\u00a0NOAA Coral Reef Watch (CRW)<\/a>\u00a0item details, we learn that the layer shows current coral bleaching conditions around the world with daily updates.\r\n\r\nAfter adding the layer, save and title your map. Then click to view the pop-up information."},{"acf_fc_layout":"image","image":639352,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"You\u2019ve now created a map showing current temperatures beneath the ocean surface along with current coral bleaching alerts. The layer pop-ups deliver information about current sea temperature and coral bleaching alerts."},{"acf_fc_layout":"image","image":639362,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"With a few additional steps, the map can be improved using styles, effects, and additional layers to make it more expressive.\r\n\r\nExperiment with different basemaps to discover which you like best. You can alter layer transparency and symbols to emphasize the content you want, and use\u00a0Effects\u00a0to emphasize layers or alter their display.\r\n\r\nThe map shown below was created using the following:\r\n