{"id":7542,"date":"2024-11-12T13:35:36","date_gmt":"2024-11-12T12:35:36","guid":{"rendered":"https:\/\/xcaliburmp.com\/?p=7542"},"modified":"2025-05-14T11:08:46","modified_gmt":"2025-05-14T09:08:46","slug":"airborne-gravity-data-capture-and-geoid-modelling","status":"publish","type":"post","link":"https:\/\/xcaliburmp.com\/pt-pt\/airborne-gravity-data-capture-and-geoid-modelling\/","title":{"rendered":"Airborne Gravity Data Capture and Geoid Modelling"},"content":{"rendered":"\r\n<div id=\"Breadcrumb-block_bbb38cbaee2411d524101bb89f692ede\" class=\"Breadcrumb\" >\r\n    <section class=\"breadcrumb\" id=\"breadcrumbs\">\r\n        <div class=\"container\">\r\n            <nav aria-label=\"Breadcrumb\" class=\"breadcrumb\">\r\n                <ul class=\"breadcrumb_list\">\r\n                                                                        <li class=\"breadcrumb_item\"><a target=\"\" class=\" breadcrumb_link\" href=\"https:\/\/xcaliburmp.com\/\">Home<\/a><\/li>\r\n                                                    <li class=\"breadcrumb_item\"><a target=\"\" class=\" breadcrumb_link\" href=\"https:\/\/xcaliburmp.com\/news\/\">News<\/a><\/li>\r\n                                                                <li class=\"breadcrumb_item\"><span class=\" breadcrumb_current\">Airborne Gravity Data Capture and Geoid Modelling<\/span><\/li>\r\n                <\/ul>\r\n            <\/nav>\r\n        <\/div>\r\n    <\/section>\r\n<\/div>\n\n\r\n<div id=\"IntroContent-block_ca0225e6b78c1c7ec04e263f743534f8\" class=\"IntroContent\" >\r\n\r\n    <section class=\"intro-content\" id=\"intro-content\">\r\n        <div class=\"container topSection\">\r\n            <div class=\"top \">\r\n                <div class=\"categories\">\r\n                                    <div class=\"category\">Last news<\/div>\r\n                                <\/div>\r\n                <div class=\"other \">\r\n                                            <div class=\"time\">5 MIN. READ<\/div>\r\n                                    <\/div>\r\n            <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"container\">\r\n                        <div class=\"singleIntro wrapper\">\r\n                <div class=\"title\"><h1>Harnessing the efficiency of airborne geophysical technology to accurately model height reference surfaces based on the Earth&#8217;s gravity field<\/h1>\n<\/div>\r\n                            <\/div>\r\n        <\/div>\r\n\r\n       <div class=\"container imageContainer\">\r\n           <div class=\"image\">\r\n                          <\/div>\r\n       <\/div>\r\n    <\/section>\r\n\r\n<\/div>\n\n\r\n<article class=\"Columns\">\r\n    <section class=\"columns\" id=\"columns\">\r\n        <div class=\"container\">\r\n            <div class=\"postWrapper\">\r\n                <div class=\"acf-innerblocks-container\">\n\r\n<article class=\"ColumnsSticky\">\r\n    <div class=\"acf-innerblocks-container\">\n\r\n\r\n<div 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width=\"100%\" height=\"100%\" style=\"display:block;border-radius:999px;\" focusable=\"false\" aria-hidden=\"true\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 32 32\"><path fill=\"#000\" d=\"M21.751 7h3.067l-6.7 7.658L26 25.078h-6.172l-4.833-6.32-5.531 6.32h-3.07l7.167-8.19L6 7h6.328l4.37 5.777L21.75 7Zm-1.076 16.242h1.7L11.404 8.74H9.58l11.094 14.503Z\"><\/path><\/svg><\/span><\/a><\/div><div class=\"heateorSssClear\"><\/div><\/div>    <\/ul>\r\n\r\n\r\n<\/div>\n<\/div>\r\n<\/article>\n\n\r\n<article class=\"ColumnsContent\">\r\n    <div class=\"acf-innerblocks-container\">\n\r\n<div id=\"TitleText-block_b5d7a4495d7e543df1ecae9b5aed4d09\" class=\"TitleText\" >\r\n\r\n    <section class=\"titletext\">\r\n        <h3 class=\"title\">What is a Geoid Model?<\/h3>\r\n        <div class=\"description\"><p>A geoid is a model of the Earth&#8217;s surface that reflects mean sea level on shore and corresponds to a flat and level surface within the Earth&#8217;s gravity field.<\/p>\n<p>This &#8220;flat&#8221; level surface is used alongside GNSS (Global Navigation Satellite Systems) coordinated height data to determine precise physical heights, providing essential context for elevation data across various applications. The geoid can be thought of as the physical reference surface from which physically meaningful elevations can be measured.<\/p>\n<\/div>\r\n    <\/section>\r\n\r\n<\/div>\n\n\r\n<div id=\"TitleText-block_6cd36ef78be3fe5a4d41108dc9ca50e2\" class=\"TitleText\" >\r\n\r\n    <section class=\"titletext\">\r\n        <h3 class=\"title\">Applications of Geoid Models<\/h3>\r\n        <div class=\"description\"><p>Geoid models are critical a critical component of positioning infrastructure, with applications which include:<\/p>\n<ul>\n<li>Surveying and Mapping: They enable efficent GNSS height measurements, for engineering and construction projects.<\/li>\n<li>Flood Risk Assessments: They underpin analysis determining water flow patterns and coastal inundation modelling.<\/li>\n<li>National Height Datum: They facilitate a unifies reference surface for measuring hights across a country, critical for infrastructure development and geographic data consistency.<\/li>\n<li>Critical National Positioning Infrastructure: The support geodetic and GNSS networks, vital for navigation, transportation, and land management.<\/li>\n<\/ul>\n<\/div>\r\n    <\/section>\r\n\r\n<\/div>\n\n\r\n<div id=\"TitleText-block_439b4b417fa19f261bf34969d840346e\" class=\"TitleText\" >\r\n\r\n    <section class=\"titletext\">\r\n        <h3 class=\"title\">Our Services: Data Capture and Geoid Modelling<\/h3>\r\n        <div class=\"description\"><p>We offer airborne gravity surveys specifically tailored for geoid modelling and data processing services to deliver geoid models that meet the highest standards. Using our proprietary <strong>iCorus-iX<\/strong> scalar gravimeter, we capture gravity data suitable for cm level accurate geoid modelling from the air, allowing for seamless and efficient data capture over large and otherwise inaccessible areas.<\/p>\n<\/div>\r\n    <\/section>\r\n\r\n<\/div>\n\n\r\n<div id=\"TitleText-block_4f3b7f6cb9cead5c5cbcb81c91577e07\" class=\"TitleText\" >\r\n\r\n    <section class=\"titletext\">\r\n        <h3 class=\"title\">Data Capture Process<\/h3>\r\n        <div class=\"description\"><ul>\n<li><strong>Scalar Absolute Gravimetry<\/strong>: We use the iCorus-iX gravimeter to measure gravity anomalies at a 3 km spatial resolution. The system provides high accuracy, with gravity anomalies accurate to within 1-2 mGal.<\/li>\n<li><strong>Survey Design<\/strong>: Flights are conducted at tailored altitudes and line spacings to ensure full coverage of the area. Depending on terrain and specific project needs, we adjust flight parameters for optimal downstream geoid modelling.<\/li>\n<\/ul>\n<p><strong>Data Processing and Modelling<\/strong><\/p>\n<p>After data capture, we process the collected data through several key steps:<\/p>\n<ul>\n<li><strong>Gravity Anomalies<\/strong>: We reduce the gravity data to anomalies on a line-by-line basis, applying time domain filters to remove any artifacts associated with system dynamics during data capture.<\/li>\n<li><strong>Least Squares Collocation<\/strong>: This method is used to interpolate gravity anomaly data in three dimensions onto regular grids at the topographic surface, as well as directly model the disturbing potential from scalar gravity anomalies.<\/li>\n<li><strong>Transformation of Potential into a Reference Surface<\/strong>: The final transformation from potential into the reference surface is tailored to meet the client\u2019s specific needs\u2014whether producing a quasi-geoid by applying Bruns\u2019 equation directly or applying additional topographic compensations (e.g., the Poincar\u00e9-Prey approach) to generate a true geoid.<\/li>\n<li><strong>Uncertainty Quantification<\/strong>: Uncertainty is propagated through the least squares collocation method and final transformations, providing estimates of accuracy for both the gravity anomalies and the resulting geoid model.<\/li>\n<\/ul>\n<\/div>\r\n    <\/section>\r\n\r\n<\/div>\n\n\r\n<div id=\"TitleText-block_251c7164a35b69770bdc8e9e7a89ee1b\" class=\"TitleText\" >\r\n\r\n    <section class=\"titletext\">\r\n        <h3 class=\"title\">Processing Methods <\/h3>\r\n        <div class=\"description\"><ul>\n<li><strong>Gravity Anomalies and Interpolation<\/strong>: Gravity anomalies are processed at flight altitudes, then interpolated into regular grids as per client specifications. The anomalies are processed specifically for geoid modelling, e.g. using orthometric heights during the reductions. The interpolation includes a downward continuation of the gravity data to the surface of the topography.<\/li>\n<li><strong>Data fusion<\/strong>: Additional data sources can be ingested during the interpolation phase using Least Squares Collocation to augment the airborne data with any existing high-fidelity gravity data coverage, or GNSS-levelled heights.<\/li>\n<li><strong>Remove-Compute-Restore Scheme<\/strong>: To ensure high precision in the long wavelengths, we use global spherical harmonic models (e.g., EGM2008) to adjust for large-scale gravity variations, allowing us to focus on the finer details of the local gravity field.<\/li>\n<\/ul>\n<\/div>\r\n    <\/section>\r\n\r\n<\/div>\n\n\r\n<div id=\"TitleText-block_be38d6dc9c1f95d2107805449b58dccd\" class=\"TitleText\" >\r\n\r\n    <section class=\"titletext\">\r\n        <h3 class=\"title\"><\/h3>\r\n        <div class=\"description\"><p><strong>Why Choose Us?<\/strong><\/p>\n<p>Our expertise in airborne geophysics and geoid modelling ensures that you receive the most accurate, reliable, and timely data for your project. Whether it\u2019s national-scale surveys or specialized local models, our team is equipped to meet the most rigorous requirements.<\/p>\n<\/div>\r\n    <\/section>\r\n\r\n<\/div>\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\"><\/div>\n<\/div>\n\n\n\r\n<div id=\"Video-block_246a1d3b02f62e13b2b9bd91ba8269f9\" class=\"Video\" >\r\n<\/div>\r\n\r\n<script>\r\n    jQuery( document ).ready(function($) {\r\n\r\n        $('.controls #pause').on('click', function (){\r\n            $(this).hide()\r\n            $('.controls #play').show();\r\n            $('#video').trigger('pause');\r\n        })\r\n        $('.controls #play').on('click', function (){\r\n            $(this).hide()\r\n            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src=\"https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/05\/GREENMETALS-WEB-1024x735.webp\" class=\"image wp-post-image\" alt=\"Xcalibur Smart Mapping advances GREENMETALS MAPPING to strengthen Europe\u2019s strategic autonomy in critical raw materials\" title=\"Xcalibur Smart Mapping advances GREENMETALS MAPPING to strengthen Europe\u2019s strategic autonomy in critical raw materials\" srcset=\"https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/05\/GREENMETALS-WEB-1024x735.webp 1024w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/05\/GREENMETALS-WEB-300x215.webp 300w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/05\/GREENMETALS-WEB-768x551.webp 768w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/05\/GREENMETALS-WEB-1536x1102.webp 1536w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/05\/GREENMETALS-WEB-2048x1470.webp 2048w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/>    <\/div>\r\n<\/div>\r\n\r\n                                                 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https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/03\/Andres-Andi-4-1-300x225.jpeg 300w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/03\/Andres-Andi-4-1-768x576.jpeg 768w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/>    <\/div>\r\n<\/div>\r\n\r\n                                                    <div class=\"cardNews\">\r\n    <div>\r\n        <div class=\"categoryOverflow\">\r\n            <div class=\"categories\">\r\n                                    <div class=\"category\">Last news<\/div>\r\n                            <\/div>\r\n        <\/div>\r\n        <div class=\"from\">\r\n                    <\/div>\r\n        <h2 class=\"title\">XENAI &#8211; The AI data platform for Earth Intelligence<\/h2>\r\n    <\/div>\r\n    <div>\r\n                <a href=\"https:\/\/xcaliburmp.com\/pt-pt\/xenai-ai\/\" target=\"_self\" class=\"button\">VER MAIS><\/a>\r\n        <img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"348\" src=\"https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/02\/Captura-de-pantalla-2026-02-06-a-las-10.36.45-1024x557.png\" class=\"image wp-post-image\" alt=\"XENAI &#8211; The AI data platform for Earth Intelligence\" title=\"XENAI &#8211; The AI data platform for Earth Intelligence\" srcset=\"https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/02\/Captura-de-pantalla-2026-02-06-a-las-10.36.45-1024x557.png 1024w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/02\/Captura-de-pantalla-2026-02-06-a-las-10.36.45-300x163.png 300w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/02\/Captura-de-pantalla-2026-02-06-a-las-10.36.45-768x418.png 768w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/02\/Captura-de-pantalla-2026-02-06-a-las-10.36.45-1536x835.png 1536w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/02\/Captura-de-pantalla-2026-02-06-a-las-10.36.45-2048x1113.png 2048w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/>    <\/div>\r\n<\/div>\r\n\r\n          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alt=\"Kazakhstan Chamber of Mines Participated in the 2nd International Mining and Metallurgy Forum in Tajikistan\" title=\"Kazakhstan Chamber of Mines Participated in the 2nd International Mining and Metallurgy Forum in Tajikistan\" srcset=\"https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/01\/Captura-de-pantalla-2026-05-12-a-las-15.51.20-1024x613.png 1024w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/01\/Captura-de-pantalla-2026-05-12-a-las-15.51.20-300x180.png 300w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/01\/Captura-de-pantalla-2026-05-12-a-las-15.51.20-768x460.png 768w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/01\/Captura-de-pantalla-2026-05-12-a-las-15.51.20-1536x920.png 1536w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/01\/Captura-de-pantalla-2026-05-12-a-las-15.51.20.png 1716w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/>    <\/div>\r\n<\/div>\r\n\r\n                                                    <div 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Africa\u2019s Most Ambitious Airborne Geophysical Mapping Programs\" title=\"DRC and Xcalibur Smart Mapping Launch One of Africa\u2019s Most Ambitious Airborne Geophysical Mapping Programs\" srcset=\"https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/01\/WhatsApp-Image-2026-01-29-at-19.52.14-1024x682.jpeg 1024w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/01\/WhatsApp-Image-2026-01-29-at-19.52.14-300x200.jpeg 300w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/01\/WhatsApp-Image-2026-01-29-at-19.52.14-768x512.jpeg 768w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2026\/01\/WhatsApp-Image-2026-01-29-at-19.52.14.jpeg 1280w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/>    <\/div>\r\n<\/div>\r\n\r\n                                                    <div class=\"cardNews\">\r\n    <div>\r\n        <div class=\"categoryOverflow\">\r\n            <div class=\"categories\">\r\n                                    <div class=\"category\">Last news<\/div>\r\n         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srcset=\"https:\/\/xcaliburmp.com\/wp-content\/uploads\/2025\/09\/Captura-de-pantalla-2025-09-10-a-las-2.34.49-1024x574.png 1024w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2025\/09\/Captura-de-pantalla-2025-09-10-a-las-2.34.49-300x168.png 300w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2025\/09\/Captura-de-pantalla-2025-09-10-a-las-2.34.49-768x431.png 768w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2025\/09\/Captura-de-pantalla-2025-09-10-a-las-2.34.49-1536x861.png 1536w, https:\/\/xcaliburmp.com\/wp-content\/uploads\/2025\/09\/Captura-de-pantalla-2025-09-10-a-las-2.34.49-2048x1148.png 2048w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/>    <\/div>\r\n<\/div>\r\n\r\n                                            <\/div>\r\n                <\/div>\r\n            <\/div>\r\n\r\n    <\/section>\r\n\r\n<\/div>\r\n\r\n\n\n\r\n<div id=\"ContactUs-block_a6c1b090fee5439154828a5ba740eaf0\" class=\"ContactUs\" >\r\n\r\n    <section id=\"cta\" class=\"cta \">\r\n        <div 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