Visibility Measurements During The 2018 Global Dust Storm Using Navcam and Mastcam onboard the Mars Science Laboratory Rover, Curiosity.

Raw visbility data supporting the paper "Visibility and Line-Of-Sight Extinction Estimates in Gale Crater during the 2018/MY34 Global Dust Storm" by Smith, Moores, Lemmon, Guzewich, Moore, Ellison, and Khayat, 2019.

Data is in the format: Sol, LTST, Center Azimuth of image (degrees), Center Elevation of image (degrees), Feature Offset Azimuth (from image center, degrees), Feature Offset Elevation (from image center, degrees), Feature Distance (m)

Filenames are of the form: Camera_ObservationType_BrightnessCorrected_RunNumber.dat.

Camera = NCAM or MCAMR, MCAMG, MCAMB (Navcam or Mastcam red, green or blue filter)
Observation type= "LOS", "CRE" or "DD360" (line of sight image, crater rim extinction image, or dust devil 360 frame).
RunNumber can be 1, 2, or 3.

Thresholds (1/signal-to-noise) for MCAM filters are provided in the files that end "_thresholds.dat" and are in the format: Sol, time (LTST), threshold.

本原始可见度数据集为Smith、Moores、Lemmon、Guzewich、Moore、Ellison及Khayat于2019年发表的论文《2018/MY34全球沙尘暴期间盖尔撞击坑内的可见度与视线消光估算》（Visibility and Line-Of-Sight Extinction Estimates in Gale Crater during the 2018/MY34 Global Dust Storm）提供数据支撑。

数据采用如下字段格式：火星日（Sol）、本地真太阳时（Local True Solar Time, LTST）、图像中心方位角（单位：度）、图像中心高度角（单位：度）、特征偏移方位角（以图像中心为基准，单位：度）、特征偏移高度角（以图像中心为基准，单位：度）、特征距离（单位：米）。

文件名遵循`Camera_ObservationType_BrightnessCorrected_RunNumber.dat`的命名规则，各组成字段含义如下：
- Camera（相机）可选NCAM、MCAMR、MCAMG或MCAMB，分别对应导航相机（Navcam）、桅杆相机红色滤光片版本、桅杆相机绿色滤光片版本、桅杆相机蓝色滤光片版本；
- 观测类型（Observation type）可取"LOS"、"CRE"或"DD360"，分别代表视线图像、撞击坑边缘消光图像及尘卷风360帧图像；
- RunNumber（运行编号）可取1、2或3。

MCAM滤光片的（1/信噪比）阈值存储在后缀为`_thresholds.dat`的文件中，此类文件的数据格式为：火星日（Sol）、时间（本地真太阳时LTST）、阈值。