Abstract
In this paper, we propose a new solution to the low RFM fitting precision caused by exposure time changing using sensor correction. First, we establish a new rigorous geometric model, with the same ephemerides, attitudes and sensor design parameters of Chang’E-2 and HRSC images, using an equal exposure time of each scan line. The original rigorous geometric model is also established. With a given height, we can establish the correspondence between the two rigorous models. Then we generate a sensor corrected image by resampling the original image using an average elevation or a digital elevation model. We found that the sensor corrected images can be used for topographic mapping which maintains almost the same precision of the original images under certain conditions. And RFM can fit rigorous geometric model of the sensor corrected image very well. Preliminary experimental results show that the RMS residual error of the RFM fitting can reach to 1/100 pixel level too. Using the proposed solution, sensors with changing exposure time can be precisely modelled by the generic RFM.
Highlights
Geometric model of the sensor imagery is the basis of high accuracy geometric processing, such as topographic mapping, geometric rectification, and co-registration (Kirk et al.,2012, Toutin et al, 2004, Scholten et al.,2011)
We found that Chang’E-2 and high-resolution stereo camera (HRSC), whose exposure time changes in different scan lines, cannot be fitted by traditional Rational Function Model (RFM) with the RMS residual error being up to 9 pixels
LRO Narrow Angle Camera (NAC) consists of two identical monochrome push-broom scanner, which can acquire high resolution images of Lunar surface with a pixel scale of 0.5m from a 50km orbit
Summary
Geometric model of the sensor imagery is the basis of high accuracy geometric processing, such as topographic mapping, geometric rectification, and co-registration (Kirk et al.,2012, Toutin et al, 2004, Scholten et al.,2011). Most study of extra-terrestrial mapping (such as lunar and Mars mapping) uses the rigorous physical sensor model based on the collinearity equations (Di et al, 2014, Radhadevi et al, 2011, Tran et al, 2010). In order to establish the rigorous sensor model, physical parameters of the imaging sensor including ephemerides, attitudes and sensor design parameters are needed. The rigorous physical sensor model is usually complex for scientists who are not specialized in photogrammetry. Because different orbital sensors have different geometric characteristics, the physical sensor models always differ from each other. A new corresponding physical sensor model should be developed whenever a new sensor is launched. It is challenging to implement rigorous sensors in digital photogrammetric workstations for all the orbital sensors
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