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It explains the purpose of a strong GRS in supporting precise positioning, smart infrastructure and resilience to climate and natural disasters, while enabling integration with international geodetic frameworks. It outlines the elements of a GRS—datums, transformation methods, standards and GNSS CORS infrastructure—and clarifies the practical applications and consequences of lacking a GRS aligned to ITRF.",{"@graph":63,"@context":118},[64,80,101],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":11,"@type":70,"position":76},"https://docshare.wps.com/template/presentations/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/the-roadmap-guidance-on-how-to-build-a-countrys-geospatial-reference-system-version-02-23-may-2025/170135/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/the-roadmap-guidance-on-how-to-build-a-countrys-geospatial-reference-system-version-02-23-may-2025/170135.png","ImageObject",442,249,{"name":88,"@type":89},"Seraphina","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/vnd.openxmlformats-officedocument.wordprocessingml.document","2026-10-21","2026-09-01",true,{"@type":98,"interactionType":99,"userInteractionCount":15},"InteractionCounter",{"@type":100},"ViewAction",{"@type":102,"mainEntity":103},"FAQPage",[104,110,114],{"name":105,"@type":106,"acceptedAnswer":107},"What is the main purpose of the Roadmap?","Question",{"text":108,"@type":109},"It provides guidance to modernise and implement a country’s Geospatial Reference System so geospatial data is accurately aligned to a unified national approach.","Answer",{"name":111,"@type":106,"acceptedAnswer":112},"Which components are included in a Geospatial Reference System (GRS)?",{"text":113,"@type":109},"A GRS includes datums or reference frames, transformation and conversion methods, positioning standards, and infrastructure such as a national GNSS CORS network and survey marks.",{"name":115,"@type":106,"acceptedAnswer":116},"How does a national GRS aligned to ITRF affect countries?",{"text":117,"@type":109},"It improves consistency and reliability of geospatial data, enabling evidence-based decisions and policies, while supporting accurate positioning and integration with international geodetic frameworks.","https://schema.org",{"og:url":78,"og:type":120,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":122,"canonical":78},"index,follow",{"doc_id":124,"site_id":56},170135,1791733765,{"code":4,"msg":5,"data":127},{"doc_id":124,"user_id":128,"nickname":88,"user_avatar":129,"doc_module":9,"category_id":8,"category_name":11,"doc_title":59,"doc_description":61,"doc_content":130,"file_id":131,"file_url":132,"file_type":133,"file_size":134,"view_count":15,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":135,"language":136,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":137,"faqs":138,"seo_title":139,"seo_description":61,"update_tm":140,"read_time":141},962075114101,"https://ap-avatar.wpscdn.com/avatar/e000253a75eb197efd?x-image-process=image/resize,m_fixed,w_180,h_180&k=1780044092746381165","\u0003\nThe Roadmap\nGuidance on how to build a country’s Geospatial Reference System\nVersion 0.2\n23 May 2025\n\u0004\nAbout the UN-GGCE\nAt its tenth session in August 2020, the United Nations Committee of Experts on Global Geospatial Information Management (UN-GGIM), in making decision 10/104, welcomed and supported an offer by Germany to establish and host what has now become the United Nations Global Geodetic Centre of Excellence (UN-GGCE) at the UN Campus in Bonn, Germany. The UN-GGCE, established in March 2023, is envisioned to be a federated centre and welcomes offers of support from Member States, including financial contributions, in person secondments, and virtual secondment.\nFor more information about the UN-GGCE please visit: \u0013 HYPERLINK \"https://ggim.un.org/UNGGCE/\" \u0014https://ggim.un.org/UNGGCE/\u0015\nDocument in development\nThis is a preliminary version of The Roadmap based on the information available to the UN-GGCE as of April 7, 2025. Further information will be gathered throughout 2025 as the UN-GGCE implements capacity development training sessions. Updates to The Roadmap will be made available throughout 2025 and a final version will be made available in all UN languages in early 2026.\nFeedback and comments\nYour feedback and comments on this report are welcome.\nPlease contact: Nicholas Brown, UN-GGCE Head of Office, E-mail: \u0013 HYPERLINK \"mailto:nicholas.brown@un.org\" \u0014nicholas.brown@un.org\u0015\n\u000f\n\u0003Content\n\u0013 TOC \\o \"1-3\" \\h \\z \\u \u0014\u0013 HYPERLINK \\l \"_Toc195648696\" \u0014Introduction\t\u0013 PAGEREF _Toc195648696 \\h \u00144\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648700\" \u00141\tUnderstand the current Geospatial Reference System and needs of stakeholders\t\u0013 PAGEREF _Toc195648700 \\h \u00147\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648701\" \u00142\tCommunicate why an update to the Geospatial Reference System is needed\t\u0013 PAGEREF _Toc195648701 \\h \u00148\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648702\" \u00143\tEstablish good governance\t\u0013 PAGEREF _Toc195648702 \\h \u00149\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648703\" \u00144\tDevelop business cases\t\u0013 PAGEREF _Toc195648703 \\h \u00149\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648704\" \u00145\tCreate a project plan\t\u0013 PAGEREF _Toc195648704 \\h \u001410\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648705\" \u00146\tEstablish a GNSS network\t\u0013 PAGEREF _Toc195648705 \\h \u001410\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648706\" \u00147\tCollect GNSS data\t\u0013 PAGEREF _Toc195648706 \\h \u001411\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648707\" \u00148\tProcess GNSS data\t\u0013 PAGEREF _Toc195648707 \\h \u001411\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648708\" \u00149\tPerform national geodetic adjustment\t\u0013 PAGEREF _Toc195648708 \\h \u001412\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648709\" \u001410\tDevelop 7-parameter transformation\t\u0013 PAGEREF _Toc195648709 \\h \u001413\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648710\" \u001411\tDevelop plate motion, distortion or deformation model\t\u0013 PAGEREF _Toc195648710 \\h \u001414\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648711\" \u001412\tDeveloping a physical height datum\t\u0013 PAGEREF _Toc195648711 \\h \u001415\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648712\" \u001413\tUpdate legal and policy documents\t\u0013 PAGEREF _Toc195648712 \\h \u001416\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648713\" \u0014Appendix A: Geodesy Factbook\t\u0013 PAGEREF _Toc195648713 \\h \u001418\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648714\" \u0014Appendix B: Communications Plan (Example)\t\u0013 PAGEREF _Toc195648714 \\h \u001419\u0015\u0015\n\u0013 HYPERLINK \\l \"_Toc195648731\" \u0014Appendix C: Airborne Gravity Business Case Example\t\u0013 PAGEREF _Toc195648731 \\h \u001422\u0015\u0015\n\u0015\u0004\n\u000f\nIntroduction\nPurpose of this document\nThe United Nations Global Geodetic Centre of Excellence (UN-GGCE) vision is a future where all countries have strong political support for geodesy which enables them to – together – implement the General Assembly Resolution 69/266 and accelerate the achievements of the Sustainable Development Goals to derive social, environmental and economic benefits. Key to a country achieving their goals is an accurate and reliable Geospatial Reference System which enables them to align and combine geospatial information and make better decisions.\nThe Roadmap provides a guidance on how to modernise and implement a country’s GRS to ensure that all geospatial data—whether from maps, satellite imagery, or GNSS-enabled technologies—is accurately aligned to a unified, nationall","cbCaipF09UuL6rWr","https://ap.wps.com/l/cbCaipF09UuL6rWr","docx",777715,24,"English","# Introduction\n## Purpose of this document\n## What is a Geospatial Reference System?","[{\"question\":\"What is the main purpose of the Roadmap?\",\"answer\":\"It provides guidance to modernise and implement a country’s Geospatial Reference System so geospatial data is accurately aligned to a unified national approach.\"},{\"question\":\"Which components are included in a Geospatial Reference System (GRS)?\",\"answer\":\"A GRS includes datums or reference frames, transformation and conversion methods, positioning standards, and infrastructure such as a national GNSS CORS network and survey marks.\"},{\"question\":\"How does a national GRS aligned to ITRF affect countries?\",\"answer\":\"It improves consistency and reliability of geospatial data, enabling evidence-based decisions and policies, while supporting accurate positioning and integration with international geodetic frameworks.\"}]","The Roadmap - Guidance on How to Build a Country’s Geospatial Reference System - Version 0.2 - 23 May 2025 | DOCX",1788268102,8]