我下过,龟速无法忍受,个别文件很大而且是不规则的形状(应该是拼接的)。
从这段来看,至少L1以上的是预处理过的。
An "exposure" (i.e., level 1) is a single readout (for IR detectors, a readout sequence following a single reset), processed through the normal single-image HST calibration pipeline. It has been bias subtracted, dark corrected, flat fielded, and, for IR MULTIACCUM images, slope-fitted to determine the count rate. Except in the IR, level 1 images still contain cosmic rays. The significant differences between HLA Level 1 products and similar products from the normal calibration pipeline include: |