{"id":996922,"date":"2020-09-03T12:00:42","date_gmt":"2020-09-03T19:00:42","guid":{"rendered":"https:\/\/www.esri.com\/arcgis-blog\/?post_type=blog&p=996922"},"modified":"2021-08-03T00:23:30","modified_gmt":"2021-08-03T07:23:30","slug":"citygmlbuildingstoi3s","status":"publish","type":"blog","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis\/3d-gis\/citygmlbuildingstoi3s","title":{"rendered":"CityGML to I3S: Streaming fast 3D city data in ArcGIS"},"author":90622,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_searchwp_excluded":""},"categories":[23771,37151,22841],"tags":[756532,756512,756542,30421,756522],"industry":[],"product":[421922],"class_list":["post-996922","blog","type-blog","status-publish","format-standard","hentry","category-3d-gis","category-design-planning","category-local-government","tag-citygml","tag-con-terra","tag-interoperability","tag-ogc","tag-safe-software","product-arcgis"],"acf":{"short_description":"This walk through introduces a new tool, developed in partnership with con terra and Safe Software, that converts CityGML 3D buildings to I3S.","flexible_content":[{"acf_fc_layout":"content","content":"

CityGML<\/span>\u00a0is an open data model, developed by the Open Geospatial Consortium (OGC), for storing\u00a0<\/span>and sharing\u00a0<\/span>city<\/span>\u00a0related spatial data<\/a> in an XML based format.\u00a0<\/span>M<\/span>any cities, regions, and even countries have adopted\u00a0<\/span>Cit<\/span>yGML<\/span>\u00a0<\/span>to<\/span>\u00a0store and disseminate\u00a0<\/span>city<\/span>\u00a0information, especially 3D building representations.\u00a0<\/span>CityGML<\/span>\u00a0data can be used in a variety of efforts such as in project planning as representations of existing conditions, or in research as a foundation of doing simulation and modeling.\u00a0<\/span>In response to\u00a0<\/span>users\u00a0<\/span>who\u00a0<\/span>want to be able to publish and use data from\u00a0<\/span>CityGML<\/span>\u00a0in the ArcGIS platform to support these kinds of workflows. Esri has partnered with\u00a0<\/span>con terra<\/span>\u00a0to build a set of tools<\/a> to convert <\/span>CityGML<\/span>\u00a0based 3D buildings into the OGC Community Standard Indexed 3D Scene Layer (I3S)<\/span>. I3S layers,<\/span>\u00a0referred to as Scene\u00a0<\/span>Layers,\u00a0<\/span>enable<\/span>\u00a0users to publish and consume 3D content in web, mobile, and desktop ArcGIS workflows.<\/span>\u00a0<\/span><\/p>\n

By following the steps in this blog, you\u2019ll be able to convert\u00a0<\/span>CityGML<\/span>\u00a0files to a Scene Layer Package (SLPK) files. SLPKs are a file format for scene layers that is used for storing, publi<\/span>s<\/span>hing, and even directly reading large 3D data sets.<\/span>\u00a0<\/span><\/p>\n"},{"acf_fc_layout":"content","content":"

Part 1: Knowing your data<\/span><\/b>\u00a0<\/span><\/p>\n

CityGML<\/span>\u00a0can store a variety of information including land use boundaries, street furniture, vegetation, and streets.\u00a0<\/span>However<\/span>,<\/span>\u00a0for the first conversion tool we have focused solely on 3D buildings. If you have additional types of data that you want to convert into an ArcGIS compatible geodatabase you can use the Quick Import from the Data Interoperability extension to do so<\/span>.<\/span>\u00a0<\/span>CityGML<\/span> can store buildings in multiple levels of detail (LOD), signified by a number from 0 to 4, with higher numbers representing greater levels of complexity and detail. (To learn more about the concept of level of detail and graphic complexity, please see this available technical paper. <\/span>http:\/\/bit.ly\/GCI-Jan2018<\/span><\/a>) You can choose to extract a specific level of detail, or have the tool automatically choose the highest level of detail available for each building.<\/span>\u00a0<\/span><\/p>\n

CityGML<\/span>\u00a0inherits GML’s handling of Coordinate Reference Systems (CRS)<\/span>\u00a0to indicate<\/span>\u00a0spatial reference such as projection and datum.\u00a0<\/span>CityGML<\/span>\u00a0allows<\/span>\u00a0well-known CRS, such as\u00a0<\/span>the\u00a0<\/span>Universal Transverse Mercator projection in the WGS84\u00a0<\/span>datum,\u00a0<\/span>and can\u00a0<\/span>also\u00a0<\/span>use CRS that are<\/span>\u00a0locally or uniquely defined with<\/span>in<\/span>\u00a0the\u00a0<\/span>CityGML<\/span>\u00a0document. In some\u00a0<\/span>cases,<\/span>\u00a0the CRS may be a 3D cartesian coordinate system based on a flat-earth approximation of the earth’s surface for use in engineering applications. You will need to specify the input coordinate system of the\u00a0<\/span>CityGML<\/span>\u00a0data in order to use the tool. The tool supports a variety of common well-known coordinate systems, as well as the ability to define custom coordinate systems for input\u00a0<\/span>CityGML<\/span>\u00a0data.<\/span>\u00a0<\/span><\/p>\n

Some cities provide access to their 3D information in a variety of formats, including\u00a0<\/span>CityGML<\/span>. For example, the city of Berlin\u00a0<\/span>provides\u00a0<\/span>Level of Detail 2 (LOD2) buildings for download through a web-based application that allows interactive selection of an area of interest.<\/span>\u00a0<\/span><\/p>\n"},{"acf_fc_layout":"image","image":{"ID":998672,"id":998672,"title":"Getting CityGML data for Berlin","filename":"ArcGIS-ARTICLE-CityGML-to-I3S-Streaming-fast-3D-city-data-in-ArcGIS-GetCityGMLData.jpg","filesize":90629,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2020\/09\/ArcGIS-ARTICLE-CityGML-to-I3S-Streaming-fast-3D-city-data-in-ArcGIS-GetCityGMLData.jpg","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis\/3d-gis\/citygmlbuildingstoi3s\/arcgis-article-citygml-to-i3s-streaming-fast-3d-city-data-in-arcgis-getcitygmldata","alt":"Getting CityGML data for Berlin","author":"90622","description":"","caption":"","name":"arcgis-article-citygml-to-i3s-streaming-fast-3d-city-data-in-arcgis-getcitygmldata","status":"inherit","uploaded_to":996922,"date":"2020-09-03 20:49:09","modified":"2020-09-03 20:49:32","menu_order":0,"mime_type":"image\/jpeg","type":"image","subtype":"jpeg","icon":"https:\/\/www.esri.com\/arcgis-blog\/wp-includes\/images\/media\/default.png","width":824,"height":448,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2020\/09\/ArcGIS-ARTICLE-CityGML-to-I3S-Streaming-fast-3D-city-data-in-ArcGIS-GetCityGMLData-213x200.jpg","thumbnail-width":213,"thumbnail-height":200,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2020\/09\/ArcGIS-ARTICLE-CityGML-to-I3S-Streaming-fast-3D-city-data-in-ArcGIS-GetCityGMLData.jpg","medium-width":464,"medium-height":252,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2020\/09\/ArcGIS-ARTICLE-CityGML-to-I3S-Streaming-fast-3D-city-data-in-ArcGIS-GetCityGMLData.jpg","medium_large-width":768,"medium_large-height":418,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2020\/09\/ArcGIS-ARTICLE-CityGML-to-I3S-Streaming-fast-3D-city-data-in-ArcGIS-GetCityGMLData.jpg","large-width":824,"large-height":448,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2020\/09\/ArcGIS-ARTICLE-CityGML-to-I3S-Streaming-fast-3D-city-data-in-ArcGIS-GetCityGMLData.jpg","1536x1536-width":824,"1536x1536-height":448,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2020\/09\/ArcGIS-ARTICLE-CityGML-to-I3S-Streaming-fast-3D-city-data-in-ArcGIS-GetCityGMLData.jpg","2048x2048-width":824,"2048x2048-height":448,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2020\/09\/ArcGIS-ARTICLE-CityGML-to-I3S-Streaming-fast-3D-city-data-in-ArcGIS-GetCityGMLData.jpg","card_image-width":824,"card_image-height":448,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2020\/09\/ArcGIS-ARTICLE-CityGML-to-I3S-Streaming-fast-3D-city-data-in-ArcGIS-GetCityGMLData.jpg","wide_image-width":824,"wide_image-height":448}},"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"

T<\/span>he Netherlands, Germany,\u00a0<\/span>France, Malaysia,\u00a0<\/span>and Abu Dhabi\u00a0<\/span>and other countries\u00a0<\/span>use<\/span>\u00a0<\/span>CityGML<\/span>\u00a0to store and disseminate 3D\u00a0<\/span>buildings as a\u00a0<\/span>component of the<\/span>ir<\/span>\u00a0National Spatial Data Infrastructure. There is a variety of sample\u00a0<\/span>CityGML<\/span>\u00a0data available on the OGC website as well<\/span>, and directly from many cities.<\/span>\u00a0<\/span><\/p>\n

Examples:<\/span>\u00a0<\/span><\/p>\n