Background for CE-1 data research. Ken Tsang. Publications: Chan, K. L., K. T. Tsang, B. Kong, Y. C. Zheng, 2010. ‘ Lunar regolith thermal behavior revealed by Chang'E-1 microwave brightness temperature data ’. Earth and Planetary Science Letters. 295, 287-291.
Chan, K. L., K. T. Tsang, B. Kong, Y. C. Zheng, 2010. ‘Lunar regolith thermal behavior revealed by Chang'E-1 microwave brightness temperature data’. Earth and Planetary Science Letters. 295, 287-291.
Y. C. Zheng, K. T. Tsang, K. L. Chan, Y. L. Zou, F. Zhang, and Z. Y. Ouyang, ‘First Microwave Map of the Moon with Chang’E-1 data: the Role of Local Time in Global Imaging’, Icarus, 2012.
K. T. Tsang, Y. C. Zheng, K. L. Chan, F. Zhang, Y. Zou, and Z. Ouyang, “Correlation Studies of CHANG'E-1 Lunar Microwave Image and Clementine Data”, Paper PS10-A012, Asia Oceania Geosciences Society Annual Meeting, 8 Aug 2011, Taipei.
K. T. Tsang, Y. C. Zheng, K. L. Chana, X. Y. Lic, Q. X. Lid, D. Zhang, Y. Liao, “Seasonal temperature variation in the polar regions of the Moon”, International Symposium Lunar Planetary Science, 26-27 March 2012, Macau.
K. T. Tsang, “Correlation Studies of CHANG'E-1 Lunar Microwave Image and Clementine Data”, 31 August 2011, seminar given at Applied Physics Laboratory, Johns Hopkins University.
Ignoring topographical effects, seasonal and diurnal temperature variation in the surface lunar layers are determined by the balance between
Horizontal coordinate system:
A: Azimuth & a: altitude
Data Preprocess: The Lunar Equatorial Coordinate system
The main disadvantage of the horizon system is the steady change of coordinates for a given astronomical object as Moon rotates. This can be removed by using a coordinate system which is fixed at the stars (or the celestial sphere defined with the Moon).
We define the lunar equatorial coordinate system similar to that defined for Earth and thus convenient for lunar observers.
: Hour Angle
: Declination (偏差)
: Lunar Latitude
Hour angle is the angular displacement of the sun east or west of the local meridian due to rotation of the moon on its axis at 15° per lunar hour with morning being negative and afternoon being positive.
Analyze the 3-Dimensional data of CE-1 (TB depends on Latitude, Longitude, Hour-angle)
Exploratory data analysis (EDA)
Exploratory data analysis (EDA) is an approach to analyze data for the purpose of formulating hypotheses worth testing, complementing the tools of conventional statistics for testing its basic characteristic.
The principle graph techniques used in EDA are scalar plot, histogram plot and other tools.
for 3 different latitude TB data within narrow latitude bands extending ±1°up & down
First, we could see the raw data below, which is regular, but there has some repetitive cover data (at fixed HA)
The figure below is the data visualization method for the the actual data points.
Half way from A to B,
Value is (A + B) / 2
TiO2 distribution retrieved from Clementine UV-VIS-IR data (Lucey et al., 2000)
Lucey, P. G., et al., 2000. Lunar iron and titanium abundance algorithms based on final processing of Clementine ultraviolet-visible images. Journal of Geophysical Research-Planets. 105, 20297-20305.
However, if the correlation is computed for the whole moon, the correlation is very low.
This may be due to noises on the maps, missing data, or the influence of shadows.
(top to bottom)
Voronoi Domain wt.%