Why does QuikSCAT Level 3 data contain fewer measurements at around 90 and 270 degrees longitude?
The main reason for having fewer measurements over the bands around 90 and 270 degrees longitude is the fact that only the latest measurements are kept, in case there are overlapping measurements within a day. Since a day starts at 00:00:00 UTC and the ascending pass crosses the equator each day at approximately 6:00 am local solar time, it means that a L3 file will start always over an area located around 90 degrees longitude. Since the number of orbits within a day is not a whole number (~14 1/2), the last portion of an ascending swath within a day (also located around 90 east) partially overlaps the first one, so that only the measurements close to the end of a day are kept, while those from the very beginning of a day are discarded. A similar process happens around 270 degrees longitude, for the descending pass.
Related Questions
- Do BCBSM and BCN consider premium statements (that include data such as name, coverage level, premium) to contain PHI as defined by HIPAA?
- What if my School Level Report and Core School Performance Indicators Report contain data that is incorrect or incomplete?
- Why does QuikSCAT Level 3 data contain fewer measurements at around 90 and 270 degrees longitude?
