Global Bundle Adjustment With Variable Orientation Point Distance for Precise Mars Express Orbit Reconstruction

Bostelmann, J.; Heipke, Christian

doi:10.5194/isprsarchives-xli-b4-361-2016

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…A detailed description of the mathematical concepts used in the bundle adjustment has been given in (Bostelmann and Heipke, 2016). Tests with the global HRSC data set have shown a distinct improvement of the EO in 96% of 3826 image strips.…”

Section: Processing Overviewmentioning

confidence: 99%

Optimizing the Distribution of Tie Points for the Bundle Adjustment Of HRSC Image Mosaics

Bostelmann

Breitkopf

Heipke

2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:For a systematic mapping of the Martian surface, the Mars Express orbiter is equipped with a multi-line scanner: Since the beginning of 2004 the High Resolution Stereo Camera (HRSC) regularly acquires long image strips. By now more than 4,000 strips covering nearly the whole planet are available. Due to the nine channels, each with different viewing direction, and partly with different optical filters, each strip provides 3D and color information and allows the generation of digital terrain models (DTMs) and orthophotos. To map larger regions, neighboring HRSC strips can be combined to build DTM and orthophoto mosaics. The global mapping scheme Mars Chart 30 is used to define the extent of these mosaics. In order to avoid unreasonably large data volumes, each MC-30 tile is divided into two parts, combining about 90 strips each. To ensure a seamless fit of these strips, several radiometric and geometric corrections are applied in the photogrammetric process. A simultaneous bundle adjustment of all strips as a block is carried out to estimate their precise exterior orientation. Because size, position, resolution and image quality of the strips in these blocks are heterogeneous, also the quality and distribution of the tie points vary. In absence of ground control points, heights of a global terrain model are used as reference information, and for this task a regular distribution of these tie points is preferable. Besides, their total number should be limited because of computational reasons. In this paper, we present an algorithm, which optimizes the distribution of tie points under these constraints. A large number of tie points used as input is reduced without affecting the geometric stability of the block by preserving connections between strips. This stability is achieved by using a regular grid in object space and discarding, for each grid cell, points which are redundant for the block adjustment. The set of tie points, filtered by the algorithm, shows a more homogenous distribution and is considerably smaller. Used for the block adjustment, it yields results of equal quality, with significantly shorter computation time. In this work, we present experiments with MC-30 half-tile blocks, which confirm our idea for reaching a stable and faster bundle adjustment. The described method is used for the systematic processing of HRSC data.

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Section: Processing Overviewmentioning

confidence: 99%

Optimizing the Distribution of Tie Points for the Bundle Adjustment Of HRSC Image Mosaics

Bostelmann

Breitkopf

Heipke

2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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A New South Polar Digital Terrain Model of Mars from the High-Resolution Stereo Camera (HRSC) onboard the ESA Mars Express

Putri

Sidiropoulos

Müller

et al. 2019

Planetary and Space Science

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The first high-resolution Digital Terrain Model (DTM) of the entire South Pole of Mars has been produced. A modified version (Kim and Muller, 2009) of a NASA-VICAR-based pipeline developed by DLR (German Aerospace Centre) and JPL (Jet Propulsion Laboratory) has been employed with image matching based on the Gotcha (Gruen-Otto-Chau) algorithm (Shin and Muller, 2012) with a specialised setup for the polar region. DTM products have been produced with more than twice the resolution (50m/pixel) of the gridded Mars Orbiter Laser Altimeter (MOLA) 512 pixels/degree (112 m/pixel) over the South Polar Residual Cap (SPRC) and the Mars South Polar region (82 o -90 o S) in MOLA and areoid reference. The accuracy of the HRSC orbital DTMs are compared against a MOLA reference with good results. HRSC orthorectified strip images from 12.5-50m have also been produced from the base DTMs and these have been processed into a 12.5m mosaic. HRSC strip products are currently being assessed as base images for automatic co-registration of thousands of high-resolution images, making them geometrically consistent with the surface conditions imaged by HRSC. In some cases, CTX DTMs have been automatically produced and co-registered to the HRSC image strips and these, in turn, are being employed for automated co-registration of higher-resolution images.

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Global Bundle Adjustment With Variable Orientation Point Distance for Precise Mars Express Orbit Reconstruction

Cited by 2 publications

References 10 publications

Optimizing the Distribution of Tie Points for the Bundle Adjustment Of HRSC Image Mosaics

Optimizing the Distribution of Tie Points for the Bundle Adjustment Of HRSC Image Mosaics

A New South Polar Digital Terrain Model of Mars from the High-Resolution Stereo Camera (HRSC) onboard the ESA Mars Express

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