NASA TOPEX/POSEIDON Project

The Sensory Data Record (SDR) is similar to the GDR product except that it also contains waveforms, which are required for retracking. This is an expert level product. If you do not need the waveforms then the GDR should suit your needs....感官数据记录（Sensory Data Record，简称SDR）与GDR产品类似，但其额外包含了重跟踪所需的波形数据。本产品为专家级专用产品，若无需使用波形数据，GDR即可满足您的使用需求。