MEX/VMC data

This includes data from the VMC instrument onboard Mars Express.<br>Each product consists on a png file and a json file with the same name. All these products are high level products made by projecting an stacking original images, available in the European Space Agency (ESA), Planetary Science Archive (PSA). All the data is in cilindrical projection.<br><br>The json files contain metadata related to each product, the metadata is:PRNAME: Product namePR_CORNERS: Coordinates for the top left and bottom right corners.PR_WIDTH: Width of the map of Mars in this projection in pixels (i.e., not the width of the image, as it does not cover the whole range of longitudes).SRC_PRS: List of source products. They are available at ESA PSA.TIME: Mean timestamp for the product.<br><br>

本数据集涵盖火星快车号（Mars Express）探测器搭载的VMC仪器采集的数据。
每个数据集产品均包含同名的PNG文件与JSON文件。所有此类产品均为对原始图像进行投影与堆叠处理后生成的高级产品，可从欧洲空间局（European Space Agency，简称ESA）行星科学档案馆（Planetary Science Archive，简称PSA）获取。所有数据均采用圆柱投影格式。

JSON文件包含对应各数据集产品的元数据，具体元数据项如下：
- PRNAME：产品名称
- PR_CORNERS：左上角与右下角的坐标
- PR_WIDTH：该投影下火星地图的像素宽度（注：并非图像自身的宽度，因该投影未覆盖全部经度范围）
- SRC_PRS：源产品列表，可于ESA PSA获取
- TIME：该产品的平均时间戳