{"id":12808,"date":"2026-06-29T16:29:00","date_gmt":"2026-06-29T14:29:00","guid":{"rendered":"http:\/\/biblus.accasoftware.com\/en\/?p=12808"},"modified":"2026-06-29T16:29:02","modified_gmt":"2026-06-29T14:29:02","slug":"ifc-coordinate-system","status":"publish","type":"post","link":"https:\/\/biblus.accasoftware.com\/en\/ifc-coordinate-system\/","title":{"rendered":"IFC coordinate system"},"content":{"rendered":"<p class=\"sommario\">IFC coordinate system and georeferencing of its elements in IFC format.\u00a0 Practical examples with Edificius, Revit, Archicad, Tekla, EdiLus<\/p>\n<p><!--more--><\/p>\n<p>The proper georeferencing of BIM models plays a critical role whenever you need to identify a set of coordinates or the coordinate reference system of an IFC file, part of a typical BIM collaboration workflow. So if you need to be sure that you are defining the parameters of a project correctly in order to export them in the IFC standard format, then you\u2019ve found the right page!<\/p>\n<p>Today&#8217;s topic is the IFC \u2018coordinate reference system\u2019. In fact, I&#8217;ll show some practical examples of how to export these values from the most common BIM <em>authoring<\/em> architectural (Revit, Archicad, Edificius) and structural (Tekla and EdiLus) software or even read them with the aid of a <a class=\"textualLink_usbim-browser\" href=\"https:\/\/www.accasoftware.com\/en\/bim-viewer\" target=\"_blank\" rel=\"noopener\">BIM viewer online<\/a>.<\/p>\n<p>Then I&#8217;ll also explain what <em>IFC coordinate reference system<\/em> means, and how the hierarchy for spatial placement of entities within an IFC file is structured.<\/p>\n<div id=\"attachment_28143\" style=\"width: 809px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-28143\" class=\"size-full wp-image-28143 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/10\/Identifying-the-coordinate-reference-system.jpg\" alt=\"IFC coordinate system: The IFC Data schema\" width=\"799\" height=\"449\" \/><p id=\"caption-attachment-28143\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-28143 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/10\/Identifying-the-coordinate-reference-system.jpg\" alt=\"IFC coordinate system: The IFC Data schema\" width=\"799\" height=\"449\" \/><\/noscript> Identifying the coordinate reference system with usBIM<\/p><\/div>\n<h2 id=\"how-to-identify-the-project-coordinates-in-an-ifc-file\">How to identify the project coordinates in an IFC file<\/h2>\n<p>If you receive an IFC file, then you probably need to find the coordinates of the reference system. In this case, you\u2019re going to need a <a class=\"textualLink_usbim-viewer\" href=https:\/\/www.accasoftware.com\/en\/ifc-viewer target=\"_blank\" rel=\"noopener\">IFC viewer<\/a> that enables you to view and read the IFC properties, including those related to geographic coordinates (IFC coordinate reference system).<\/p>\n<p>Believe it or not but it&#8217;s so simple. You just need to follow these 4 steps:<\/p>\n<ul>\n<li>log in to usBIM with your ACCA account;<\/li>\n<li>upload the IFC file to the usBIM cloud;<\/li>\n<li>open the file by clicking on the right-hand side menu;<\/li>\n<li>select the terrain entity (<code>IfcSite<\/code>);<\/li>\n<li>read the geographic coordinate values (latitude, longitude, elevation) directly in the properties toolbox.<\/li>\n<\/ul>\n<p>Also remember that usBIM.viewer+ is certified by <a href=\"https:\/\/www.buildingsmart.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">buildingSMART International<\/a> and is already used by thousands of users around the world.<\/p>\n<h2 id=\"ifc-coordinate-reference-systems-edificius\">IFC coordinate reference systems &#8211; Edificius<\/h2>\n<p>At this point, we can now see how to export the IFC project and define the <code>IFC coordinate reference system<\/code> with <a href=\"https:\/\/www.accasoftware.com\/en\/architecture-design-software\" target=\"_blank\" rel=\"noopener noreferrer\">Edificius<\/a>, the BIM <em>authoring<\/em> software for architectural design integrated with a MEP modeller.<\/p>\n<p>First of all, you can identify the project origin, in its local reference coordinate sytem (0;0;0). Now this is quite a simple procedure. Just set a reference node at (0;0;0): this now represents your project&#8217;s ZERO origin point in space.<\/p>\n<p>To set the <strong>relative coordinates\u00a0<\/strong>of an object in relation to the local system of coordinates, we can proceed as follows:<\/p>\n<ul>\n<li>select the object;<\/li>\n<li>edit the<strong> XYZ<\/strong> values in the properties toolbox.<\/li>\n<\/ul>\n<p>This positions the object in space according to the values assigned to the cartesian coordinates.<\/p>\n<p>To set the project site&#8217;s <strong>geographical coordinates <\/strong>(this means we want to define the<code>IfcSite<\/code>coordinates):<\/p>\n<ul>\n<li>access <em>General Data in the <\/em>toolbox on the left;<\/li>\n<li>set the geographical coordinate values (latitude, longitude, altitude), inserting them manually or selecting them from the locations archive that you can see available in the dialog box.<\/li>\n<\/ul>\n<p>At this point, all you need to do is export the project in the IFC format. The file will maintain all of the information and data assigned to the objects, including the coordinates that characterize the site position.<\/p>\n<p>To <strong>export<\/strong> the file in the IFC format:<\/p>\n<ul>\n<li>click on the <em>File<\/em> icon on the toolbar at the top left hand side of the interface;<\/li>\n<li>click on the <em>Exports option;<br \/>\n<\/em><\/li>\n<li>select the IFC <em>Format;<\/em><\/li>\n<li>define the IFC Export Settings;<em><br \/>\n<\/em><\/li>\n<li>click <em>OK<\/em> to confirm and save in the desired folder path.<\/li>\n<\/ul>\n<h2 id=\"\"><\/h2>\n<div id=\"attachment_40161\" style=\"width: 1359px\" class=\"wp-caption alignnone\"><img decoding=\"async\" aria-describedby=\"caption-attachment-40161\" class=\"size-full wp-image-40161 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/10\/interface-ifc-coordinate-system-settings.jpg\" alt=\"Edificius interface | IFC coordinate system settings\" width=\"1349\" height=\"857\" \/><p id=\"caption-attachment-40161\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-40161 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/10\/interface-ifc-coordinate-system-settings.jpg\" alt=\"Edificius interface | IFC coordinate system settings\" width=\"1349\" height=\"857\" \/><\/noscript> Edificius interface | IFC coordinate system settings<\/p><\/div>\n<h2 id=\"ifc-coordinate-reference-systems-revit\">IFC coordinate reference systems &#8211; Revit<\/h2>\n<p>To set the user reference system in <strong>revit<\/strong>, follow these next few steps:<\/p>\n<ul>\n<li>select <em>Manage <\/em>from the menu<\/li>\n<li>click <em>Coordinates<\/em> on the ribbonbar<\/li>\n<li>now select <em>Specify coordinates at point<\/em><\/li>\n<li>insert the coordinates.<\/li>\n<\/ul>\n<p>To specify the <code>IfcSite<\/code> absolute coordinates:<\/p>\n<ul>\n<li>select <em>Manage <\/em>from the menu<\/li>\n<li>click on <em>Location<\/em><\/li>\n<li>insert the geographical coordinates in the pop-up dialog\u00a0or select the location from the archive.<\/li>\n<\/ul>\n<div id=\"attachment_12998\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-12998\" class=\"size-full wp-image-12998 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Revit_dialog-location.jpg\" alt=\"IFC coordinate reference systems \" width=\"800\" height=\"450\" \/><p id=\"caption-attachment-12998\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-12998 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Revit_dialog-location.jpg\" alt=\"IFC coordinate reference systems \" width=\"800\" height=\"450\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Revit_dialog-location.jpg 800w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Revit_dialog-location-300x169.jpg 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Revit_dialog-location-768x432.jpg 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Revit_dialog-location-705x397.jpg 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Revit_dialog-location-284x160.jpg 284w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> Revit interface| Dialog Location<\/p><\/div>\n<h2 id=\"ifc-coordinate-reference-systems-archicad\">IFC coordinate reference systems &#8211; Archicad<\/h2>\n<p>To set the user reference system in <strong>Archicad<\/strong>:<\/p>\n<ul>\n<li>select the <em>Move user origin<\/em> command present on the toolbar<\/li>\n<li>click on the desired point.<\/li>\n<\/ul>\n<p>To specify the <code>IfcSite<\/code> absolute coordinates:<\/p>\n<ul>\n<li>click <em>Option<\/em> from the menu toolbar<\/li>\n<li>select <em>Project preference<\/em><\/li>\n<li>click on P<em>roject location<\/em><\/li>\n<li>insert the coordinates in the pop-up dialog.<\/li>\n<\/ul>\n<div id=\"attachment_12999\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-12999\" class=\"size-full wp-image-12999 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Archicad_dialog-project-location.jpg\" alt=\"IFC coordinate reference systems \" width=\"800\" height=\"500\" \/><p id=\"caption-attachment-12999\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-12999 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Archicad_dialog-project-location.jpg\" alt=\"IFC coordinate reference systems \" width=\"800\" height=\"500\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Archicad_dialog-project-location.jpg 800w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Archicad_dialog-project-location-300x188.jpg 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Archicad_dialog-project-location-768x480.jpg 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Archicad_dialog-project-location-705x441.jpg 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Archicad_dialog-project-location-256x160.jpg 256w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> Archicad interface| Dialog of the Project location<\/p><\/div>\n<h2 id=\"ifc-coordinate-reference-systems-edilus\">IFC coordinate reference systems &#8211; EdiLus<\/h2>\n<p>To set the local reference system coordinates for a point in EdiLus:<\/p>\n<ul>\n<li>select the object;<\/li>\n<li>edit the<strong> XYZ<\/strong> values in the properties toolbox.<\/li>\n<\/ul>\n<p>Confirming, position the object in space in relation to the assigned cartesian coordinate values based on the EdiLus reference system.<\/p>\n<p>To set the geographical coordinates and therefore georeference the project site:<\/p>\n<ul>\n<li>access <em>General Data in the <\/em>toolbox on the left;<\/li>\n<li>set the geographical coordinate values (latitude, longitude, altitude), that you can see available in the dialog box.<\/li>\n<\/ul>\n<p>At this point all you need to do is export the project in IFC format. The file will maintain all objects related information, including the site coordinates and position.<\/p>\n<h2 id=\"ifc-coordinate-reference-systems-tekla\">IFC coordinate reference systems &#8211; Tekla<\/h2>\n<p>To set the base point coordinates in Tekla, proceed as described below:<\/p>\n<ul>\n<li>click on <em>File<\/em><\/li>\n<li>select the Project p<em>roperties<\/em><\/li>\n<li>click on <em>Base Point <\/em><\/li>\n<li>insert the coordinated values in the dialog.<\/li>\n<\/ul>\n<div id=\"attachment_13001\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-13001\" class=\"size-full wp-image-13001 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/tekla_dialog-base-point.jpg\" alt=\"IFC coordinate reference systems \u2013 Tekla\" width=\"800\" height=\"382\" \/><p id=\"caption-attachment-13001\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-13001 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/tekla_dialog-base-point.jpg\" alt=\"IFC coordinate reference systems \u2013 Tekla\" width=\"800\" height=\"382\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/tekla_dialog-base-point.jpg 800w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/tekla_dialog-base-point-300x143.jpg 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/tekla_dialog-base-point-768x367.jpg 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/tekla_dialog-base-point-705x337.jpg 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/tekla_dialog-base-point-335x160.jpg 335w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> Tekla interface| Base point dialog<\/p><\/div>\n<h2 id=\"verifying-the-ifc-coordinate-system\">Verifying the IFC coordinate system<\/h2>\n<p>To verify the correctness of the project positioning information within the IFC (exported with a BIM authoring software &#8211; such as Edificius, Revit, Tekla, EdiLus, etc&#8230;) you can use an <a class=\"textualLink_usbim-browser\" href=\"https:\/\/www.accasoftware.com\/en\/bim-viewer\" target=\"_blank\" rel=\"noopener\">online BIM viewer<\/a>.<\/p>\n<h2 id=\"reference-systems-in-ifc-format\">Reference systems in IFC format<\/h2>\n<p>After having dealt with the practical part, I also wanted to explain some of the fundamental concepts that may be useful.<\/p>\n<p>To manage the reference systems in the IFC format you can use:<\/p>\n<ul>\n<li><strong>absolute coordinates,<\/strong> when referring to the global reference system;<\/li>\n<li><strong>relative coordinates,<\/strong> which refer to the positioning of another element;<\/li>\n<li><strong>constrained coordinates, <\/strong>if you need to refer to the axes of a defined grid.<\/li>\n<\/ul>\n<p>Each element will be correctly positioned in space through appropriate hierarchies.<\/p>\n<p>Conceptually, the geolocation of a project starts from the<code>IfcSite<\/code>, an entity used to build the spatial structure of a building.<\/p>\n<p>The<code>IfcSite<\/code> is defined through a system of absolute coordinates or a system of coordinates relating to another entity. Let\u2019s assume we&#8217;re using the absolute coordinate system.<\/p>\n<p>First, let&#8217;s determine the position of the<code>IfcBuilding<\/code> (building&#8217;s elevation) through a coordinate reference system with respect to the <code>IfcSite<\/code>.<\/p>\n<p>Next, we can define the <code>IfcBuildingStorey<\/code>, that represents the levels of a building.<\/p>\n<p>Each entity (IfcWall, IfcSlab, IfcBeam, etc.) is associated to the <code>IfcBuildingStorey<\/code> through specific relationships (<code>IfcRelContained<\/code>, <code>InSpatialStructure<\/code>).<\/p>\n<p>Basically, given an entity, for example a column, we can in the first instance assign it to a certain level of the spatial structure, specifically the storey, that is in turn assigned to the site terrain. Lastly, the terrain is georeferenced through the coordinates of a point (that usually corresponds to the project origin point).<\/p>\n<p>The illustration below summarises the concept of entities hierarchical placement.<\/p>\n<div id=\"attachment_13003\" style=\"width: 332px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-13003\" class=\"size-full wp-image-13003 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifcreferencesystem-inphographics.jpg\" alt=\"Ifc reference system\" width=\"322\" height=\"999\" \/><p id=\"caption-attachment-13003\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-13003 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifcreferencesystem-inphographics.jpg\" alt=\"Ifc reference system\" width=\"322\" height=\"999\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifcreferencesystem-inphographics.jpg 322w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifcreferencesystem-inphographics-97x300.jpg 97w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifcreferencesystem-inphographics-227x705.jpg 227w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifcreferencesystem-inphographics-52x160.jpg 52w\" sizes=\"(max-width: 322px) 100vw, 322px\" \/><\/noscript> <br \/>Infographics that illustrates the hierarchy for spatial positioning of entities<\/p><\/div>\n<h2 id=\"ifc4-and-reference-systems\">IFC4 and reference systems<\/h2>\n<p><code>IfcCoordinateReferenceSystem<\/code> is a new entity provided by IFC4 that serves to define a coordinate reference system only through qualified identifiers (see the <a href=\"https:\/\/standards.buildingsmart.org\/IFC\/RELEASE\/IFC4\/ADD2_TC1\/HTML\/link\/introduction.htm\" target=\"_blank\" rel=\"noopener noreferrer\">specific section of the buildingSMART International website<\/a>).<\/p>\n<p>A coordinate reference system allows you to define the geographical position of a point on the earth\u2019s surface and is related to the real world by a <em>datum <\/em>(that represents the way in which a geoid is approximated &#8211; i.e. the real earth&#8217;s surface &#8211; through the ellipsoid &#8211; a more or less regular solid). The <em>datum<\/em> is the combination of the ellipsoid and the orientation with respect to the geoid.<\/p>\n<p>There are global and local datum: the so called <strong>WGS84<\/strong> (provided by Google Maps and widely used in GPS systems) is based on global datum: the ellipsoid is positioned at the earth\u2019s centre of gravity and can be used in all continents. Instead, the local datum, make the ellipsoid coincide with the real earth surface in a particular point, called &#8220;base point&#8221;.<\/p>\n<div id=\"attachment_12972\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-12972\" class=\"size-full wp-image-12972 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/geoid-ellipsoid.jpg\" alt=\"IFC coordinate system and georeferencing of its elements in IFC format\" width=\"800\" height=\"569\" \/><p id=\"caption-attachment-12972\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-12972 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/geoid-ellipsoid.jpg\" alt=\"IFC coordinate system and georeferencing of its elements in IFC format\" width=\"800\" height=\"569\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/geoid-ellipsoid.jpg 800w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/geoid-ellipsoid-300x213.jpg 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/geoid-ellipsoid-768x546.jpg 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/geoid-ellipsoid-260x185.jpg 260w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/geoid-ellipsoid-705x501.jpg 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/geoid-ellipsoid-225x160.jpg 225w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> Datum and reference systems: terrestrial, geoid and ellipsoid surfaces and their perpendiculars<\/p><\/div>\n<p>Anybody interested in cartography and digital map making, who needs to know exact latitude and longitude values in different spatial reference systems, could refer to the<a href=\"https:\/\/epsg.org\/home.html\" target=\"_blank\" rel=\"noopener noreferrer\"><strong> EPSG<\/strong> (European Petroleum Survey Group)<\/a>, a structured dataset of coordinate reference systems with a wordlwide geographic coverage of data and coordinate transformations. EPSG has reached even greater importance after the growing use of GIS software.<\/p>\n<div id=\"attachment_13007\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-13007\" class=\"size-full wp-image-13007 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/EPSG-online-service.jpg\" alt=\"GIS and BIM EPSG online service interface\" width=\"800\" height=\"398\" \/><p id=\"caption-attachment-13007\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-13007 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/EPSG-online-service.jpg\" alt=\"GIS and BIM EPSG online service interface\" width=\"800\" height=\"398\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/EPSG-online-service.jpg 800w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/EPSG-online-service-300x149.jpg 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/EPSG-online-service-768x382.jpg 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/EPSG-online-service-705x351.jpg 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/EPSG-online-service-322x160.jpg 322w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> EPSG online service interface<\/p><\/div>\n<p>With regard to the IFC4, the reference system adopted for the geolocalization is stored in the <em>Name<\/em> attribute of the <code>IfcCoordinateReferenceSystem<\/code><em>.<\/em><\/p>\n<div class=\"international-product-banner-desktop\" style=\"text-align: center;\"><a class=\"product-banner-link\" href=https:\/\/www.accasoftware.com\/en\/ifc-viewer target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto\/usbim-viewer-en.jpg\" alt=\"usbim-viewer\" \/><noscript><img decoding=\"async\" class=\"lazyload\" src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto\/usbim-viewer-en.jpg\" alt=\"usbim-viewer\" \/><\/noscript><\/a><\/div>\n<div class=\"international-product-banner-mobile\" style=\"text-align: center;\"><a class=\"product-banner-link\" href=https:\/\/www.accasoftware.com\/en\/ifc-viewer target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto_mobile\/usbim-viewer-en.jpg\" alt=\"usbim-viewer\" \/><noscript><img decoding=\"async\" class=\"lazyload\" src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto_mobile\/usbim-viewer-en.jpg\" alt=\"usbim-viewer\" \/><\/noscript><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>IFC coordinate system and georeferencing of its elements in IFC format.\u00a0 Practical examples with Edificius, Revit, Archicad, Tekla, EdiLus<\/p>\n","protected":false},"author":19,"featured_media":42548,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_data_scadenza_evento":"","_evento_nome":"","_evento_data":"","_evento_luogo":"","_evento_cta":"","keyword_en":"","keyword_es":"","keyword_fr":"","keyword_de":"","keyword_ptb":"","_note_content":"","footnotes":""},"categories":[1890],"tags":[5062,2216,4900,5069,5208,5257,5283,5071],"class_list":["post-12808","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ifc-open-bim","tag-acca-viewer","tag-newsletter-136","tag-newsletter-165","tag-newsletter-296","tag-newsletter-391","tag-newsletter-434","tag-newsletter-457","tag-newsletter-intro02"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - 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