Distribution of Olivine and Pyroxene Derived from Clementine Data in Crater Copernicus  

作　　者：刘福江 杨荣 章颖 乔乐 王顺 杨阳 王小攀 

机构地区：[1]Faculty of Information Engineering,China University of Geosciences

出　　处：《Journal of Earth Science》2011年第5期586-594,共9页地球科学学刊（英文版）

基　　金：supported by the Research Foundation of Science and Technology, China University of Geosciences (Wuhan);the Fundamental Research Funds for the Central Universities (No. 2010119047)

摘　　要：In order to derive the distribution of olivine and pyroxene in Crater Copernicus, we compute two band ratios （950/750 and 2 000/1 500 nm）, percent content of elements （Ai%, Ca%, Mg%, FeO%） and maturity （Is/FeO） based on Clementine UVVIS and NIR image data. The central peaks of Copernicus, which are known to be olivine-rich or pyroxene-rich, are chosen as ＂ground truth＂ and ROIs used to derive the distribution of olivine and pyroxene with a decision tree and spectral angle mapper （SAM）. Additionally, we compared previous works and the extraction results coming from the decision tree and the SAM method. The extraction of olivine by both decision tree and SAM agrees well with the previous works＇ descriptions, and the result by SAM is more accurate than that by decision tree because spectral features are fully used in SAM. For pyroxene extraction, there is a difference between SAM and the decision tree; one of the reasons is that the decision tree does not fully take advantage of spectral features but is only based on statistics. SAM uses band indices that can be easily extended to other areas on the Moon.In order to derive the distribution of olivine and pyroxene in Crater Copernicus, we compute two band ratios （950/750 and 2 000/1 500 nm）, percent content of elements （Ai%, Ca%, Mg%, FeO%） and maturity （Is/FeO） based on Clementine UVVIS and NIR image data. The central peaks of Copernicus, which are known to be olivine-rich or pyroxene-rich, are chosen as ＂ground truth＂ and ROIs used to derive the distribution of olivine and pyroxene with a decision tree and spectral angle mapper （SAM）. Additionally, we compared previous works and the extraction results coming from the decision tree and the SAM method. The extraction of olivine by both decision tree and SAM agrees well with the previous works＇ descriptions, and the result by SAM is more accurate than that by decision tree because spectral features are fully used in SAM. For pyroxene extraction, there is a difference between SAM and the decision tree; one of the reasons is that the decision tree does not fully take advantage of spectral features but is only based on statistics. SAM uses band indices that can be easily extended to other areas on the Moon.

关 键 词：CLEMENTINE OLIVINE PYROXENE SAM decision tree the Moon. 

分 类 号：P588.124[天文地球—岩石学]