首页|资源三号03星立体影像与激光测高点联合区域网平差处理及精度验证

资源三号03星立体影像与激光测高点联合区域网平差处理及精度验证

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利用国产卫星影像开展全球范围地理信息资源建设的前提条件之一是提升卫星影像无地面控制条件下几何精度水平.2020年7月成功发射资源三号03星(ZY3-03)是资源三号系列卫星中的第3颗高分辨率立体测绘卫星,主要用于全球范围1∶5万比例尺测图应用.卫星搭载了 3台全色线阵推扫式光学相机和一台多光谱相机,可获取优于2.5 m分辨率的三线阵立体影像和5.8m分辨率的多光谱影像.为了提升卫星影像的高程精度,卫星还设计搭载了一台单波束激光测高仪,可同步获取高精度激光测高点.本文提出了一种ZY3-03星激光测高点与立体影像联合区域网平差处理方法.利用激光测高点和同轨获取的正视影像相对平面误差较小的特性,准确获取激光测高点在立体影像上的像方位置;将激光测高点作为立体影像高程控制,并以整轨立体影像为单位开展立体影像与激光测高点的联合区域网平差,实现立体影像高程精度大幅提升.选取黑龙江省中部地区和河北省太行山地区的ZY3-03星三线阵立体影像及其同轨获取的激光测高点开展联合区域网平差试验,结果表明,平地和丘陵地形区域的ZY3-03星立体影像的高程中误差从5.27 m降低至2.58 m,山地地形区域的ZY3-03立体影像的高程中误差从11.25 m降低至4.45 m,均能满足中国1:5万比例尺立体测图的精度要求.
Combined adjustment of the stereo imagery and laser altimetry points of the ZY3-03 Satellite and its accuracy verification
When using domestic satellites for global geographic resource construction,one of the most important promises is to improve the geometric accuracy of satellite imagery lacking Ground Control Points(GCPs).The Ziyuan3-03(ZY3-03)satellite,launched on July 25,2020,was the third high-resolution stereo mapping satellite of the Ziyuan3 series.ZY3-03 is mainly used for the global application of 1∶50000-scale mapping.Triple linear-array push-broom panchromatic cameras with a resolution of ≤2.5 m and a multispectral camera with a resolution of 5.8 m were loaded on this satellite.Moreover,an additional single-beam laser altimeter was loaded on the ZY3-03 satellite to improve its vertical accuracy.This addition enables satellites to simultaneously obtain high-vertical-accuracy Laser Altimetry Points(LAPs).The integration of stereo-images and LAPs for improving the vertical accuracy of stereo-images is considered the key to realizing the application of 1∶50,000-scale stereo mapping of ZY3-03 images with sparse or no GCPs.A combined block adjustment method involving ZY3-03 triple linear-array stereo-images and synchronous orbit LAPs was proposed to improve the elevation accuracy of images.First,a method for accurately obtaining the image coordinates of LAPs on stereo-images was designed.Given the slight differences in relative planar errors between LAPs and synchronous nadir images,the image coordinates of LAPs on synchronous orbit nadir images could be correctly acquired using the image rational function model(RFM)and the ground geodetic coordinates of the LAPs.Then,accurate pixel coordinates of the LAPs on the triple linear-array stereo-images were determined via high-precision image matching between the forward/backward images and nadir images.The use of whole-orbital stereo-images as the operation unit allowed for the construction of a combined block adjustment model based on RFM and a combined block adjustment strategy.A total of 12 ZY3-03 satellite triple linear-array stereo image pairs and 81 synchronous orbit LAPs of plain and hilly terrains in Heilongjiang Province,China,were selected as the experimental data.Simultaneously,270 global positioning system(GPS)points were collected as checkpoints.For the combined adjustment between stereo-images and LAPs,the vertical root mean square error(RMSE)of the images was reduced from 5.27 to 2.58 m.Then,seven ZY3-03 satellite triple linear-array stereo image pairs and six synchronous orbit LAPs of mountainous terrains in Hebei Province were selected as experimental data,with 115 GPS points taken as checkpoints.After performing the combined block adjustment,the vertical RMSE of the images decreased from 11.25 to 4.45 m.The experimental results indicate that the vertical accuracy of the ZY3-03 images increased significantly.The obtained data can satisfy the precision requirements of 1:50,000-scale stereo mapping in China.The combined block adjustment method can be effectively implemented regardless of the terrain(i.e.,flat,hilly,or mountainous).The vertical accuracy of stereo-images can be greatly improved to satisfy the accuracy requirements of 1∶50000-scale stereo mapping in China.

remote sensingZiyuan3-03 satellitetriple linear-array stereo imagerylaser altimetry pointcombined block adjustmentgeometric accuracy

周平、唐新明、李丹丹、王霞

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自然资源部国土卫星遥感应用中心,北京 100048

清华大学地球系统科学系,北京 100084

遥感 资源三号03星 三线阵立体影像 激光测高点 联合区域网平差 几何精度

高分遥感测绘应用示范系统项目(第二期)自然资源三维确权登记卫星影像支撑项目

42-Y30B04-9001-19/21121133000000190009

2024

10.11834/jrs.20221117

遥感学报
中国地理学会环境遥感分会 中国科学院遥感应用研究所

遥感学报

CSTPCD北大核心
影响因子：2.921
ISSN：1007-4619
年,卷(期)：2024.28(4)
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