Laser Spot Center Location Method for Chinese Spaceborne GF-7 Footprint Camera
The Gaofen-7 (GF-7) satellite is equipped with two area array sensor footprint cameras to capture the laser altimeter spot. In order to establish a direct correspondence between the laser data and the stereo image data, a new method is proposed to fit the center of the spot using the brightness diff...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-04-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/20/8/2319 |
| _version_ | 1797570273335050240 |
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| author | Chaofeng Ren Junfeng Xie Xiaodong Zhi Yun Yang Shuai Yang |
| author_facet | Chaofeng Ren Junfeng Xie Xiaodong Zhi Yun Yang Shuai Yang |
| author_sort | Chaofeng Ren |
| collection | DOAJ |
| description | The Gaofen-7 (GF-7) satellite is equipped with two area array sensor footprint cameras to capture the laser altimeter spot. In order to establish a direct correspondence between the laser data and the stereo image data, a new method is proposed to fit the center of the spot using the brightness difference between the spot image and the footprint image. First, the geometric registration between the spot image and the footprint image is completed based on feature matching or template matching. Then, the brightness values between the two images are extracted from the corresponding image position to form a measurement, and the least squares adjustment method is used to calculate the parameters of the brightness conversion model between the spot image and the footprint image. Finally, according to the registration relationship, the center of the identified spots is respectively positioned in the footprint images, so that the laser spots are accurately identified in the along-track stereo footprint images. The experimental results show that the spot error of this method is less than 0.7 pixel, which has higher reliability and stability, and can be used for a GF-7 satellite footprint camera. |
| first_indexed | 2024-03-10T20:23:33Z |
| format | Article |
| id | doaj.art-c0a40f64531b482d81ace6eb11b1c75b |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T20:23:33Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-c0a40f64531b482d81ace6eb11b1c75b2023-11-19T22:02:01ZengMDPI AGSensors1424-82202020-04-01208231910.3390/s20082319Laser Spot Center Location Method for Chinese Spaceborne GF-7 Footprint CameraChaofeng Ren0Junfeng Xie1Xiaodong Zhi2Yun Yang3Shuai Yang4College of Geological Engineering and Geomatics, Chang’an University, Xi’an 710054, ChinaSatellite Surveying and Mapping Application Center, NASG, Beijing 100048, ChinaBeijing QZ Robotics Co., Ltd., Beijing 100085, ChinaCollege of Geological Engineering and Geomatics, Chang’an University, Xi’an 710054, ChinaCollege of Geological Engineering and Geomatics, Chang’an University, Xi’an 710054, ChinaThe Gaofen-7 (GF-7) satellite is equipped with two area array sensor footprint cameras to capture the laser altimeter spot. In order to establish a direct correspondence between the laser data and the stereo image data, a new method is proposed to fit the center of the spot using the brightness difference between the spot image and the footprint image. First, the geometric registration between the spot image and the footprint image is completed based on feature matching or template matching. Then, the brightness values between the two images are extracted from the corresponding image position to form a measurement, and the least squares adjustment method is used to calculate the parameters of the brightness conversion model between the spot image and the footprint image. Finally, according to the registration relationship, the center of the identified spots is respectively positioned in the footprint images, so that the laser spots are accurately identified in the along-track stereo footprint images. The experimental results show that the spot error of this method is less than 0.7 pixel, which has higher reliability and stability, and can be used for a GF-7 satellite footprint camera.https://www.mdpi.com/1424-8220/20/8/2319GF-7 satellitespot center extractionfootprint cameragaussian fittingsatellite laser altimeter |
| spellingShingle | Chaofeng Ren Junfeng Xie Xiaodong Zhi Yun Yang Shuai Yang Laser Spot Center Location Method for Chinese Spaceborne GF-7 Footprint Camera Sensors GF-7 satellite spot center extraction footprint camera gaussian fitting satellite laser altimeter |
| title | Laser Spot Center Location Method for Chinese Spaceborne GF-7 Footprint Camera |
| title_full | Laser Spot Center Location Method for Chinese Spaceborne GF-7 Footprint Camera |
| title_fullStr | Laser Spot Center Location Method for Chinese Spaceborne GF-7 Footprint Camera |
| title_full_unstemmed | Laser Spot Center Location Method for Chinese Spaceborne GF-7 Footprint Camera |
| title_short | Laser Spot Center Location Method for Chinese Spaceborne GF-7 Footprint Camera |
| title_sort | laser spot center location method for chinese spaceborne gf 7 footprint camera |
| topic | GF-7 satellite spot center extraction footprint camera gaussian fitting satellite laser altimeter |
| url | https://www.mdpi.com/1424-8220/20/8/2319 |
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