Next Article in Journal
Ocean Wind and Wave Measurements Using X-Band Marine Radar: A Comprehensive Review
Previous Article in Journal
Multipath Interferences in Ground-Based Radar Data: A Case Study
Article Menu
Issue 12 (December) cover image

Export Article

Open AccessEditor’s ChoiceArticle
Remote Sens. 2017, 9(12), 1262; doi:10.3390/rs9121262

A Novel Pixel-Level Image Matching Method for Mars Express HRSC Linear Pushbroom Imagery Using Approximate Orthophotos

1
Department of Aerial Photogrammetry, Xi’an Information Technique Institute of Surveying and Mapping, Xi’an 710054, China
2
Department of Photogrammetry, Zhengzhou Institute of Surveying and Mapping, Zhengzhou 450052, China
*
Author to whom correspondence should be addressed.
Received: 25 October 2017 / Revised: 1 December 2017 / Accepted: 2 December 2017 / Published: 5 December 2017
(This article belongs to the Section Remote Sensing Image Processing)
View Full-Text   |   Download PDF [67337 KB, uploaded 22 December 2017]   |  

Abstract

Mars topographic data, such as digital orthophoto maps (DOMs) and digital elevation models (DEMs) are essential to planetary science and exploration missions. The main objective of our study is to generate a higher resolution DEM using the Mars Express (MEX) High Resolution Stereo Camera (HRSC). This paper presents a novel pixel-level image matching method for HRSC linear pushbroom imagery. We suggest that image matching firstly be carried out on the approximate orthophotos. Then, the matched points are converted to the original images for forward intersection. The proposed method adopts some practical strategies such as hierarchical image matching and normalized cross-correlation (NCC). The characteristic strategies are: (1) the generation of a DEM and a DOM at each pyramid level; (2) the use of the generated DEM at the current pyramid level as reference data to generate approximate orthophotos at the next pyramid level; and (3) the use of the ground point coordinates of orthophotos to estimate the approximate positions of conjugate points. Hence, the refined DEM is used in the image rectification process, and pixel coordinate displacements of conjugate points on the approximate orthophotos will become smaller and smaller. Four experimental datasets acquired by the HRSC were used to verify the proposed method. The generated DEM was compared with the HRSC Level-4 DEM product. Experimental results demonstrate that an accurate and precise Mars DEM can be generated with the proposed method. The approximate positions of the conjugate points can be estimated with an accuracy of three pixels at the original image resolution level. Though slight systematic errors of about two pixels were observed, the generated DEM results show good consistency with the HRSC Level-4 DEM. View Full-Text
Keywords: Mars mapping; pixel-level image matching; approximate orthophotos; linear pushbroom imagery; back-projection; High Resolution Stereo Camera; surface reconstruction; DEM; DGAP Mars mapping; pixel-level image matching; approximate orthophotos; linear pushbroom imagery; back-projection; High Resolution Stereo Camera; surface reconstruction; DEM; DGAP
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Geng, X.; Xu, Q.; Xing, S.; Lan, C.; Xu, J. A Novel Pixel-Level Image Matching Method for Mars Express HRSC Linear Pushbroom Imagery Using Approximate Orthophotos. Remote Sens. 2017, 9, 1262.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Remote Sens. EISSN 2072-4292 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top