RCCM.out: Samples of MISR RCCM data to explore the missing data replacement process

This data publication provides access to (1) an archive of maps and statistics on MISR RCCM data products updated as described in Verstraete et al. (2020, https://doi.org/10.5194/essd-2019-77), (2) a user manual describing this archive, and (3) a large archive of standard (unprocessed) MISR data files that can be used in conjunction with the IDL software repository published on GitHub and available from https://github.com/mmverstraete (Verstraete et al., 2019, https://doi.org/10.5281/zenodo.3240018). The authors also make a self-contained, stand-alone version of that processing software available to all users, using the IDL Virtual Machine technology (which does not require an IDL license) from Verstraete et al., 2020: http://doi.org/10.5880/fidgeo.2020.008. (1) The compressed archive 'RCCM_Out.zip' contains all outputs produced in the course of generating the various Figures of the manuscript Verstraete et al. (2020). Once this archive is installed and uncompressed, 8 subdirectories named Pxxx-Oyyyyyy-Bzzz are created, where xxx, yyyyyy and zzz stand for the Path, Orbit and Block numbers, respectively. At a minimum, those directories contain a 'GM/RCCM' subdirectory that includes a collection of 75 text, graphics (maps in PNG format) and binary data files relative to the intermediary, final and ancillary results generated while preparing those Figures. The 3 subdirectories for Orbit 92981, as well as the one dedicated to Orbit 78010, contain a subdirectory labeled 'GM/RCCM__[cc]-[l1]-[l2]' instead, where [cc] indicates the camera whose data have been modified to evaluate the performance of the algorithms, and [l1] and [l2] indicate the first and last line that is artificially deemed to contain missing data: those subdirectories include collections of 93 text, graphics and binary data files; they include maps of the RCCM data product before and after this artificial modification. Two of those subdirectories (for Orbits 2111 and 78171) also contain a subdirectory 'GM/L1B2', which hosts a number of text and graphics (maps in PNG format) files obtained by plotting the top of atmosphere bidirectional reflectance measured by the MISR instrument. These images can be used to verify visually the state of the cloud cover in the corresponding cameras and spectral bands. Each map is accompanied by a similarly named text file providing the legend of the corresponding map. Those subdirectories also contain log files that report on the success rate of the replacement algorithm as well as accuracy of the replacement procedure, when some data are artificially removed. (2) The document 'RCCM_Out.pdf' provides the User Manual to install and explore the compressed archive 'RCCM_Out.zip'. (3) The compressed archive 'RCCM_input_68050.zip' contains MISR L1B2 GRP and RCCM data for the full Orbit 68050, acquired on 3 October 2012. This file includes data for a wide range of locations, from Russia to north-west Iran, central and eastern Iraq, Saudi Arabia, and many more countries along the eastern coast of the African continent. It is provided to allow users to analyze actual data with the software package mentioned above, without needing to download MISR data from the NASA ASDC web site.

本数据出版物提供以下三类资源的获取途径：(1) 依据Verstraete等人（2020年，https://doi.org/10.5194/essd-2019-77）所述更新的MISR（多角度成像光谱辐射计，Multi-angle Imaging SpectroRadiometer）RCCM（区域云覆盖监测器，Regional Cloud Cover Monitor）数据产品的地图与统计档案；(2) 用于说明该档案的用户手册；(3) 可与GitHub上发布的IDL（交互式数据语言，Interactive Data Language）软件仓库配合使用的标准化（未处理）MISR数据文件大型档案，该仓库可从https://github.com/mmverstraete获取（Verstraete等人，2019年，https://doi.org/10.5281/zenodo.3240018）。作者还依托IDL虚拟机技术（无需IDL许可证），提供了该处理软件的独立完整的单机版本供所有用户使用，相关资源见Verstraete等人2020年发布的http://doi.org/10.5880/fidgeo.2020.008。(1) 压缩档案`RCCM_Out.zip`包含了生成Verstraete等人（2020年）论文中各类图表过程中产出的全部结果。解压并安装该档案后，将生成8个名为`Pxxx-Oyyyyyy-Bzzz`的子目录，其中xxx、yyyyyy及zzz分别代表路径号（Path）、轨道号（Orbit）与区块号（Block）。此类目录至少包含一个`GM/RCCM`子目录，其内存储了75个文本文件、图形文件（PNG格式地图）与二进制数据文件，涵盖制备上述图表过程中产生的中间结果、最终结果与辅助结果。针对轨道92981的3个子目录，以及专用于轨道78010的子目录，其目录结构略有不同：它们包含一个名为`GM/RCCM__[cc]-[l1]-[l2]`的子目录，其中`[cc]`表示为评估算法性能而修改了对应相机的数据，`[l1]`与`[l2]`分别表示被人工标记为数据缺失的首行与末行。此类子目录包含93个文本、图形与二进制数据文件集合，涵盖了经人工修改前后的RCCM数据产品地图。其中轨道2111与78171对应的2个子目录，还包含一个`GM/L1B2`子目录，其内存储了通过绘制MISR仪器测得的大气层顶双向反射率得到的若干文本与图形文件（PNG格式地图）。此类图像可用于直观验证对应相机与光谱波段中的云覆盖状态。每张地图均配有同名文本文件，用于说明该地图的图例。此外，这些子目录还包含日志文件，用于记录当部分数据被人工移除时，数据替换算法的成功率与替换流程的精度。(2) 文档`RCCM_Out.pdf`为用户手册，用于指导用户安装与使用压缩档案`RCCM_Out.zip`。(3) 压缩档案`RCCM_input_68050.zip`包含2012年10月3日获取的完整轨道68050的MISR L1B2 GRP与RCCM数据。该数据集覆盖了从俄罗斯至伊朗西北部、伊拉克中部与东部、沙特阿拉伯，以及非洲大陆东海岸沿线诸多国家在内的广泛区域。提供该档案旨在让用户无需从NASA ASDC网站下载MISR数据，即可借助前述软件包开展实际数据分析工作。