scholarly journals Optical Satellite Sensor and Positioning Accuracy Assessment for The Hongqi-H9 Wide-Range Satellite in Different Terrains

2020 ◽  
Author(s):  
Wenping Song ◽  
Jianxiong Wang ◽  
Yang Bai ◽  
Linhui Wang ◽  
Xiang Li ◽  
...  
Keyword(s):  
Satellite Images ◽  
Accuracy Assessment ◽  
Control Point ◽  
Image Data ◽  
Surface Structures ◽  
Ground Control ◽  
Mountainous Areas ◽  
Positioning Accuracy ◽  
Rational Polynomial ◽  
Wide Range

Abstract The Hongqi-H9 wide-range satellite, which was launched on January 15, 2020, has a resolution of less than 1 m and a swath width of 136 km. This satellite is the largest sub-meter level satellite worldwide and the first ton-level commercial remote sensing satellite in China. In particular, this satellite can acquire sub-meter image data for an area of approximately 1,000 km2 per second and full-coverage image information for an area of more than 1,000,000 km2. This study was aimed at assessing the geometric positioning accuracy of the Hongqi-H9 satellite considering three aspects, namely, the circle error accuracy, rational polynomial coefficient based direct geometric positioning accuracy and ground control point based absolute positioning accuracy under urban, plain, and mountainous areas, with different topographies. The results of the conducted experimental investigation indicated that the Hongqi-H9 satellite could exhibit a high positioning accuracy in planar and vertical directions for different terrains. In particular, for areas with a low topography and few surface structures, the geometric positioning accuracy of the Hongqi-H9 satellite imagery was less than 4 and 2 m in the planimetry and elevation directions, respectively. These characteristics can promote the application of the Hongqi-H9 satellite images in agricultural surveys, target detection, and land surveys, among other domains.

scholarly journals Optical satellite sensor and positioning accuracy analysis for the Hongqi-1-H9 wide-range satellite in different terrains

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Wenping Song ◽  
Jianxiong Wang ◽  
Yang Bai ◽  
Linhui Wang ◽  
Xiang Li ◽  
...  
Keyword(s):  
Satellite Images ◽  
Control Point ◽  
Surface Structures ◽  
Ground Control ◽  
Accuracy Analysis ◽  
Mountainous Areas ◽  
Excellent Performance ◽  
Positioning Accuracy ◽  
Rational Polynomial ◽  
Wide Range

AbstractThe excellent performance of geometric positioning of a newly launched satellite will greatly broaden its application field. Launched on January 15, 2020, the Hongqi-1-H9 wide-range satellite is the largest sub-meter-level satellite worldwide and the first ton-level commercial remote sensing satellite in China, with a resolution of less than 1 m and a swath width of 136 km. This study was aimed at assessing the geometric positioning accuracy of this newly launched satellite considering three aspects, namely, the circle error accuracy, rational polynomial coefficient-based direct geometric positioning accuracy and ground control point-based absolute positioning accuracy under urban, plain, and mountainous areas, with different topographies. The results of the conducted experimental investigation indicated that the Hongqi-1-H9 satellite could exhibit a high positioning accuracy in planar and vertical directions for different terrains. In particular, for our experimental areas with a low topography and few surface structures, the geometric positioning accuracy of the Hongqi-1-H9 satellite imagery was less than 4m and 2 m in the planimetry and elevation directions, respectively. These characteristics can promote the application of the Hongqi-1-H9 satellite images in agricultural surveys, target detection, and land surveys, among other domains.

scholarly journals Optimizing Orientation by GCP Refinement of Very High Resolution IKONOS Satellite Images

2010 ◽  
pp. 35-39
Author(s):  
Madhusudan Adhikari
Keyword(s):  
Spatial Data ◽  
Satellite Images ◽  
Control Point ◽  
Large Error ◽  
Stereo Image ◽  
Ground Control ◽  
Polynomial Coefficients ◽  
Rational Polynomial ◽  
Transformation Algorithm ◽  
Very High

The Rational Polynomial Coefficients (RPC) provided with the IKONOS images contains a large error and they need Ground Control Point (GCP) refinement. To present the technique of refinement of RPCs by the application of some appropriate transformation algorithm with some suitable number of GCPs in proper constellation in an optimal way to achieve high geometric accuracy during spatial data acquisition from IKONOS stereo image is the objective of this paper. From this study it was found that GCP refinement of RPCs by affine transformation with four GCPs in proper constellation is optimal for the orientation of the image pair under study, it was also found that at least two redundant GCPs are necessary for proper refinement by a particular transformation algorithm.

scholarly journals Geometric Accuracy Assessment of Deimos-2 Panchromatic Stereo Pairs: Sensor Orientation and Digital Surface Model Production

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7234
Author(s):  
Manuel A. Aguilar ◽  
Rafael Jiménez-Lao ◽  
Abderrahim Nemmaoui ◽  
Fernando J. Aguilar
Keyword(s):  
Urban Areas ◽  
Satellite Images ◽  
Accuracy Assessment ◽  
Bare Soil ◽  
Surface Model ◽  
Stereo Pair ◽  
Rational Polynomial ◽  
Sensor Orientation ◽  
Vertical Accuracy ◽  
Land Covers

Accurate elevation data, which can be extracted from very high-resolution (VHR) satellite images, are vital for many engineering and land planning applications. In this way, the main goal of this work is to evaluate the capabilities of VHR Deimos-2 panchromatic stereo pairs to obtain digital surface models (DSM) over different land covers (bare soil, urban and agricultural greenhouse areas). As a step prior to extracting the DSM, different orientation models based on refined rational polynomial coefficients (RPC) and a variable number of very accurate ground control points (GCPs) were tested. The best sensor orientation model for Deimos-2 L1B satellite images was the RPC model refined by a first-order polynomial adjustment (RPC1) supported on 12 accurate and evenly spatially distributed GCPs. Regarding the Deimos-2 based DSM, its completeness and vertical accuracy were compared with those obtained from a WorldView-2 panchromatic stereo pair by using exactly the same methodology and semiglobal matching (SGM) algorithm. The Deimos-2 showed worse completeness values (about 6% worse) and vertical accuracy results (RMSEZ 42.4% worse) than those computed from WorldView-2 imagery over the three land covers tested, although only urban areas yielded statistically significant differences (p < 0.05).

Design of the Ground Control Point Image Databases

2013 ◽  
Vol 427-429 ◽  
pp. 1493-1496
Author(s):  
Yan Li ◽  
Xiao He Zhang
Keyword(s):  
Control Point ◽  
Image Data ◽  
Image Database ◽  
Image Databases ◽  
Ground Control ◽  
Ground Control Point ◽  
Storage Solutions ◽  
Point Image ◽  
Point Data ◽  
Aerospace Images

Ground control point data is necessary in the aerospace images geometric processing. This study proposed the design solutions for the ground control point image databases. At first, this study compared the storage management manners of the control point data. Then, it analyzed the control point image data features. Accordingly, it mentioned the database storage solutions. Next, this study discussed the image control point database query methods. Finally, it designed a ground control point image database management and application system. The experiments show that it is an effective method for the control point image database.

Directly Georeferenced Ground Feature Points with UAV Borne Photogrammetric Platform without Ground Control

2013 ◽  
Vol 284-287 ◽  
pp. 1523-1527
Author(s):  
Meng Lun Tsai ◽  
Kai Wei Chiang ◽  
Cheng Fang Lo ◽  
Jiann Yeou Rau
Keyword(s):  
Real Time ◽  
Spatial Information ◽  
Disaster Relief ◽  
Low Cost ◽  
Control Point ◽  
Integrated System ◽  
Single Frequency ◽  
Ground Control ◽  
Differential Gps ◽  
Positioning Accuracy

In order to facilitate applications such as environment detection or disaster monitoring, developing a quickly and low cost system to collect near real time spatial information is very important. Such a rapid spatial information collection capability has become an emerging trend in the technology of remote sensing and mapping application. In this study, a fixed-wing UAV based spatial information acquisition platform is developed and evaluated. The proposed UAV based platform has a direct georeferencing module including an low cost INS/GPS integrated system, low cost digital camera as well as other general UAV modules including immediately video monitoring communication system. This direct georeferencing module is able to provide differential GPS processing with single frequency carrier phase measurements to obtain sufficient positioning accuracy. All those necessary calibration procedures including interior orientation parameters, the lever arm and boresight angle are implemented. In addition, a flight test is performed to verify the positioning accuracy in direct georeferencing mode without using any ground control point that is required for most of current UAV based photogrammetric platforms. In other word, this is one of the pilot studies concerning direct georeferenced based UAV photogrammetric platform. The preliminary results in term of positioning accuracy in direct georeferenced mode without using any GCP illustrate horizontal positioning accuracies in x and y axes are both less than 20 meters, respectively. On the contrary, the positioning accuracy of z axis is less than 50 meters with 600 meters flight height above ground. Such accuracy is good for near real time disaster relief. Therefore, it is a relatively safe and cheap platform to collect critical spatial information for urgent response such as disaster relief and assessment applications where ground control points are not available.

scholarly journals Assessing the Accuracy of Ortho-image using Photogrammetric Unmanned Aerial System

2016 ◽  
Vol XLI-B1 ◽  
pp. 867-872 ◽  
Author(s):  
H. H. Jeong ◽  
J. W. Park ◽  
J. S. Kim ◽  
C. U. Choi
Keyword(s):  
Camera Calibration ◽  
Low Cost ◽  
Control Point ◽  
Image Data ◽  
Ground Control ◽  
Target Area ◽  
Smart Camera ◽  
Ground Control Point ◽  
Time Basis ◽  
Elevation Model

Smart-camera can not only be operated under network environment anytime and any place but also cost less than the existing photogrammetric UAV since it provides high-resolution image, 3D location and attitude data on a real-time basis from a variety of built-in sensors. This study’s proposed UAV photogrammetric method, low-cost UAV and smart camera were used. The elements of interior orientation were acquired through camera calibration. The image triangulation was conducted in accordance with presence or absence of consideration of the interior orientation (IO) parameters determined by camera calibration, The Digital Elevation Model (DEM) was constructed using the image data photographed at the target area and the results of the ground control point survey. This study also analyzes the proposed method’s application possibility by comparing a Ortho-image the results of the ground control point survey. Considering these study findings, it is suggested that smartphone is very feasible as a payload for UAV system. It is also expected that smartphone may be loaded onto existing UAV playing direct or indirect roles significantly.

scholarly journals DESARROLLO DE UNA METODOLOGÍA SENCILLA PARA LA GEORREFERENCIACIÓN Y MEDICIÓN DE DISTANCIAS A PARTIR DE IMÁGENES DE SATÉLITE SISTEMÁTICAMENTE GEORREFERENCIADAS

2016 ◽  
Vol 39 (1) ◽  
Author(s):  
Leonardo Gónima ◽  
Libardo E. Ruiz ◽  
Marcos E. González
Keyword(s):  
Satellite Images ◽  
Control Point ◽  
Ground Control ◽  
Gps Data ◽  
Control Points ◽  
Statistical Validation ◽  
Distance Measurements ◽  
The North ◽  
Ground Control Points ◽  
Representative Points

One of the main problems for a precise georeferencing and distance measurements from satellite images, especially in geographical zones with strong morphologic and environmental dynamics, lies not only in the difficulty for identifying ground control points (GCPs), but also in real limitations for accessing such places. In this work a relatively simple methodology is proposed for georeferencing and distance measuring from satellite images, based on the utilization of previously calculated reflectance images from the surface and then oriented toward the north (systematic georeferencing). From these images and setting a basic control point (pixel) P, measured with GPS, the other GCPs were obtained by measurements of distances defined from the P point to representative points (pixels) on the image, selected for its georeferencing. The statistical validation of the obtained results, using a different sample of GCPs measured with GPS, shows that the precision of the georeferencing and distance measurement utilizing the developed methodology is similar to that obtained by conventional procedures, such as image georeferencing from GPS data.

EVALUASI KETELITIAN HASIL ORTHOREKTIFIKASI CITRA SATELIT RESOLUSI TINGGI MENGGUNAKAN DEM STEREO-PAIR PLEIADES

2019 ◽  
Vol 3 ◽  
pp. 11
Author(s):  
Diaz Cahya Kusuma Yuwana ◽  
Maundri Prihanggo ◽  
Agung Syetiawan
Keyword(s):  
Sea Level ◽  
Digital Elevation Model ◽  
Control Point ◽  
Ground Control ◽  
Stereo Pair ◽  
Check Point ◽  
Mean Sea Level ◽  
Rational Polynomial ◽  
Digital Elevation ◽  
Elevation Model

Implementasi proses orthorektifikasi membutuhkan data Digital Elevation Model (DEM) yang akurat. Ketersediaan data DEM yang akurat menjadi permasalahan tersendiri dalam proses orthorektifikasi. DEM hasil proses stereo-pair citra satelit pleiades menjadi sebuah alternatif. Penelitian ini berfokus untuk mengkaji ketelitian geometrik hasil orthorektifikasi dengan masukan DEM hasil stereo-pair (1m) citra satelit plaiades dengan DEM IFSAR (5m). Data yang digunakan meliputi sepasang Citra Satelit Pleiades, data hasil pengukuran GPS sebanyak 23 titik yang nantinya 11 titik dijadikan sebagai Ground Control Point (GCP) dan 12 titik dijadikan sebagai Independent Check Point (ICP), dan data DEM Ifsar 5 meter. Penelitian ini mendasarkan pada perbandingan ketelitian geometrik antara citra hasil othorektifikasi menggunakan masukan DEM IFSAR 5 m dengan masukan DEM dari hasil proses stereo-pair dua pasang citra satelit pleiades. Metode rational polynomial coefficient (RPC) digunakan untuk mendapatkan pembentukan epipolar citra dan citra ortho. DEM hasil stereo-pair citra satelit plaiades memiliki rentang -37 meter sampai dengan 155 meter di atas mean sea level (MSL). DEM hasil stereo-pair jauh lebih detail dari DEM IFSAR, kondisi perumahan dan jalan raya terepresentasikan lebih baik dan lebih jelas. Akurasi pada citra hasil orthorektifikasi menggunkan DEM stereo-pair 1 m adalah 1,04019 lebih baik dari hasil ortho menggunakan DEM IFSAR 5 m yaitu 1,12783. Perbedaan resolusi DEM sebesar 4 meter tidak signifikan mempengaruhi hasil orthorektifikasi citra satelit resolusi tinggi. Secara keseluruhan hasil akhir yang didapat dari kedua citra ortho dengan masukan data DEM tersebut masuk dalam ketelitian peta skala 1:5000 kelas 2 CE90.

scholarly journals Assessing the Accuracy of Ortho-image using Photogrammetric Unmanned Aerial System

2016 ◽  
Vol XLI-B1 ◽  
pp. 867-872
Author(s):  
H. H. Jeong ◽  
J. W. Park ◽  
J. S. Kim ◽  
C. U. Choi
Keyword(s):  
Camera Calibration ◽  
Low Cost ◽  
Control Point ◽  
Image Data ◽  
Ground Control ◽  
Target Area ◽  
Smart Camera ◽  
Ground Control Point ◽  
Time Basis ◽  
Elevation Model

Smart-camera can not only be operated under network environment anytime and any place but also cost less than the existing photogrammetric UAV since it provides high-resolution image, 3D location and attitude data on a real-time basis from a variety of built-in sensors. This study’s proposed UAV photogrammetric method, low-cost UAV and smart camera were used. The elements of interior orientation were acquired through camera calibration. The image triangulation was conducted in accordance with presence or absence of consideration of the interior orientation (IO) parameters determined by camera calibration, The Digital Elevation Model (DEM) was constructed using the image data photographed at the target area and the results of the ground control point survey. This study also analyzes the proposed method’s application possibility by comparing a Ortho-image the results of the ground control point survey. Considering these study findings, it is suggested that smartphone is very feasible as a payload for UAV system. It is also expected that smartphone may be loaded onto existing UAV playing direct or indirect roles significantly.

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