{"id":8401,"date":"2025-11-05T08:00:45","date_gmt":"2025-11-05T08:00:45","guid":{"rendered":"https:\/\/vdcd.vn\/?p=8401"},"modified":"2025-11-05T09:40:48","modified_gmt":"2025-11-05T09:40:48","slug":"thong-tu-07-2021-tt-btnmt-quy-dinh-ve-ky-thuat-thu-nhan-va-xu-ly-du-lieu-anh","status":"publish","type":"post","link":"https:\/\/vdcd.vn\/en\/thong-tu-07-2021-tt-btnmt-quy-dinh-ve-ky-thuat-thu-nhan-va-xu-ly-du-lieu-anh\/","title":{"rendered":"Geodetic Surveying Process Using Drones (Flycam)"},"content":{"rendered":"<p class=\"wp-block-paragraph\">To ensure accuracy and detail for all collected data, VietFlycam applies drone-based scanning technology, conducting three detailed flight passes combined with National Geodetic control points.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Transferring National Geodic control points to the Project<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The coordinate and control point system applied in the survey process including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VN-2000 National Coordinate System<\/li>\n\n\n\n<li>National Height System<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Control point system includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Coordinate Control Network: Based on the nearest foundational cadastral points provided by the Surveying and Mapping Data Center \u2013 Department of Surveying, Mapping, and Geographic Information of Vietnam.<\/li>\n\n\n\n<li>Coordinate and Elevation Benchmarks: Used to determine the position and elevation of surveyed points on the ground and the image center. These benchmarks provide precise and accurate information about the location and height of all measured points.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/khao-sat-dia-hinh-bang-flycam-2-1024x683-1.jpg\" alt=\"\" class=\"wp-image-8407\" srcset=\"https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/khao-sat-dia-hinh-bang-flycam-2-1024x683-1.jpg 1024w, https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/khao-sat-dia-hinh-bang-flycam-2-1024x683-1-300x200.jpg 300w, https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/khao-sat-dia-hinh-bang-flycam-2-1024x683-1-768x512.jpg 768w, https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/khao-sat-dia-hinh-bang-flycam-2-1024x683-1-18x12.jpg 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">During the surveying process, the first step is to identify the national cadastral control points located near the survey area on the official geodetic benchmark map. This involves selecting two primary control points: one as the reference point and another to verify the X:Y coordinates of newly established points, ensuring high measurement accuracy and data reliability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Next, the national elevation benchmark is determined to establish the Z-coordinate (altitude) of survey points relative to sea level. This step enables precise topographic measurement and elevation mapping, forming the foundation for accurate aerial surveying, UAV-based mapping, and 3D terrain modeling.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Distribute Ground Control Points (GCPs) Across the Survey Area for Error Control<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ground Control Points (GCPs) are evenly distributed reference points measured according to the VN-2000 coordinate system to control positional accuracy. These points are linked to aerial images to ensure precise geo-referencing. The processed data then generates a high-accuracy orthophoto map and 3D terrain model, essential for drone surveying and mapping projects.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/11-1-1024x683.jpg\" alt=\"\" class=\"wp-image-8420\" srcset=\"https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/11-1-1024x683.jpg 1024w, https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/11-1-300x200.jpg 300w, https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/11-1-768x512.jpg 768w, https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/11-1-1536x1024.jpg 1536w, https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/11-1-2048x1365.jpg 2048w, https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/11-1-18x12.jpg 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc 3: Ti\u1ebfn h\u00e0nh bay qu\u00e9t b\u1eb1ng flycam<\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"673\" src=\"https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/487076403_1212169640916374_9039680261127473925_n-1-1-1024x673.jpg\" alt=\"\" class=\"wp-image-8421\" srcset=\"https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/487076403_1212169640916374_9039680261127473925_n-1-1-1024x673.jpg 1024w, https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/487076403_1212169640916374_9039680261127473925_n-1-1-300x197.jpg 300w, https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/487076403_1212169640916374_9039680261127473925_n-1-1-768x504.jpg 768w, https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/487076403_1212169640916374_9039680261127473925_n-1-1-18x12.jpg 18w, https:\/\/vdcd.vn\/wp-content\/uploads\/2025\/11\/487076403_1212169640916374_9039680261127473925_n-1-1.jpg 1297w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<h5 class=\"wp-block-heading\">L\u1ea7n 1: X\u00e1c \u0111\u1ecbnh d\u00e1ng \u0111\u1ecba h\u00ecnh t\u1ed5ng th\u1ec3 c\u1ee7a khu v\u1ef1c<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Ti\u1ebfn h\u00e0nh bay to\u00e0n b\u1ed9 khu v\u1ef1c \u0111\u1ec3 thu th\u1eadp d\u1eef li\u1ec7u v\u1ec1 d\u00e1ng \u0111\u1ecba h\u00ecnh t\u1ed5ng th\u1ec3&nbsp;<strong><a href=\"https:\/\/vietflycam.vn\/bay-quet-3d-dia-hinh-bang-flycam-co-gi-dac-biet\/\" target=\"_blank\" rel=\"noopener\">b\u1eb1ng flycam<\/a><\/strong>. Qu\u00e1 tr\u00ecnh n\u00e0y cung c\u1ea5p c\u00e1i nh\u00ecn to\u00e0n di\u1ec7n v\u1ec1 \u0111\u1ecba h\u00ecnh, bao g\u1ed3m th\u00f4ng tin v\u1ec1 \u0111\u1ed9 cao, \u0111\u1ed9 d\u1ed1c, \u0111\u1ed9 l\u1ed3i l\u00f5m, h\u00ecnh d\u1ea1ng \u0111\u1ecba h\u00ecnh v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 kh\u00e1c.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">L\u1ea7n 2: Bay scan 3D theo d\u00e1ng \u0111\u1ecba h\u00ecnh<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7t-Flycam kh\u00e1c bi\u1ec7t v\u1edbi c\u00e1c \u0111\u01a1n v\u1ecb kh\u1ea3o s\u00e1t kh\u00e1c b\u1eb1ng vi\u1ec7c th\u1ef1c hi\u1ec7n bay scan 3D theo d\u00e1ng \u0111\u1ecba h\u00ecnh, nh\u1eb1m \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ph\u00e2n gi\u1ea3i v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ed3ng \u0111\u1ec1u tr\u00ean to\u00e0n khu v\u1ef1c \u0111o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c t\u1ea5m \u1ea3nh \u0111\u01b0\u1ee3c ch\u1ee5p \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1ecba v\u1eadt, khu v\u1ef1c (\u0111\u01b0\u1eddng x\u00e1, nh\u00e0 c\u1eeda,\u2026) v\u00e0 c\u00f4ng ngh\u1ec7 tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o (AI) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ef1 \u0111\u1ed9ng khoanh v\u00f9ng c\u00e1c khu v\u1ef1c c\u00f3 c\u00e2y bao ph\u1ee7 \u0111\u1ec3 chu\u1ea9n b\u1ecb cho b\u01b0\u1edbc l\u1ecdc c\u00e2y c\u1ed1i tr\u00ean \u0111\u1ecba h\u00ecnh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D\u1eef li\u1ec7u thu th\u1eadp t\u1ef1 \u0111\u1ed9ng \u0111\u01b0\u1ee3c x\u1eed l\u00fd b\u1eb1ng n\u1ec1n t\u1ea3ng tracdiaso \u0111\u1ec3 t\u1ea1o ra s\u1ea3n ph\u1ea9m b\u1ea3n \u0111\u1ed3 2D \u0111\u1ed9 n\u00e9t cao v\u00e0 m\u00f4 h\u00ecnh 3D t\u1ed5ng th\u1ec3 to\u00e0n khu v\u1ef1c.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">B\u01b0\u1edbc 3: Bay l\u1ecdc b\u1ecf l\u1edbp c\u00e2y b\u1eb1ng c\u00f4ng ngh\u1ec7 Lidar<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7t-Flycam ti\u1ebfn h\u00e0nh bay l\u1ea7n th\u1ee9 ba theo c\u00e1c khu v\u1ef1c th\u1ef1c ph\u1ee7 \u0111\u01b0\u1ee3c khoanh v\u00f9ng t\u1eeb l\u1ea7n bay th\u1ee9 hai, s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 Lidar \u0111\u1ec3 l\u1ecdc b\u1ecf l\u1edbp c\u00e2y.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed1i v\u1edbi c\u00e1c khu v\u1ef1c ph\u1ee9c t\u1ea1p nh\u01b0 r\u1eebng, c\u00e2y b\u1ee5i, th\u1ef1c ph\u1ee7 d\u00e0y \u0111\u1eb7c, Vi\u1ec7t-Flycam s\u1ebd th\u1ef1c hi\u1ec7n \u0111o \u0111\u1ea1c l\u1ea1i b\u1eb1ng c\u00f4ng ngh\u1ec7 RTK \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u00ednh x\u00e1c cho to\u00e0n khu v\u1ef1c.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">K\u1ebft qu\u1ea3 c\u1ee7a qu\u00e1 tr\u00ecnh n\u00e0y l\u00e0 d\u1eef li\u1ec7u \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 m\u1eb7t \u0111\u1ea5t v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 tr\u00ean ng\u1ecdn c\u00e2y, gi\u00fap cung c\u1ea5p th\u00f4ng tin ch\u00ednh x\u00e1c v\u1ec1 \u0111\u1ecba h\u00ecnh v\u00e0 m\u00f4i tr\u01b0\u1eddng trong khu v\u1ef1c kh\u1ea3o s\u00e1t.<\/p>","protected":false},"excerpt":{"rendered":"<p>To ensure accuracy and detail across all collected data, VDCD Vietflycam applies drone-based scanning technology, conducting three detailed flights in combination with National Geodetic Control points. Step 1: Integrate the national geodetic points into the project system [\u2026]<\/p>","protected":false},"author":1,"featured_media":8420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1,2],"tags":[36,35,34],"class_list":["post-8401","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ban-do-so","category-all-post","tag-ban-do-so","tag-scan-3d","tag-trac-dia"],"acf":[],"_links":{"self":[{"href":"https:\/\/vdcd.vn\/en\/wp-json\/wp\/v2\/posts\/8401","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vdcd.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vdcd.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vdcd.vn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vdcd.vn\/en\/wp-json\/wp\/v2\/comments?post=8401"}],"version-history":[{"count":3,"href":"https:\/\/vdcd.vn\/en\/wp-json\/wp\/v2\/posts\/8401\/revisions"}],"predecessor-version":[{"id":8423,"href":"https:\/\/vdcd.vn\/en\/wp-json\/wp\/v2\/posts\/8401\/revisions\/8423"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vdcd.vn\/en\/wp-json\/wp\/v2\/media\/8420"}],"wp:attachment":[{"href":"https:\/\/vdcd.vn\/en\/wp-json\/wp\/v2\/media?parent=8401"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vdcd.vn\/en\/wp-json\/wp\/v2\/categories?post=8401"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vdcd.vn\/en\/wp-json\/wp\/v2\/tags?post=8401"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}