Eliminating Bowtie Effect of MODIS Data Without Ephemeris

There exist bowtie effects in MODIS L1B data because of the Earth's curvature and the characteristics of MODIS detector, namely some datum is overlapped at the edge of a scan. Bowtie effects can't be eliminated after geometry calibration, so eliminating bowtie effects has to be done before geometry calibration. It can be eliminated using ephemeris which is complex and difficult for common user to get ephemeris. We used two simple methods and compared their location accuracy after geometry calibration in this paper.