  Moving objects have characteristic signatures in multi-spectral images made
by Earth observation satellites that use push broom scanning. While the general
concept is applicable to all satellites of this type, each satellite design has
its own unique imaging system and requires unique methods to analyze the
characteristic signatures. We assess the feasibility of detecting moving
objects and measuring their velocities in one particular archive of satellite
images made by Planet Labs Corporation with their constellation of SuperDove
satellites. Planet Labs data presents a particular challenge in that the images
in the archive are mosaics of individual exposures and therefore do not have
unique time stamps. We explain how the timing information can be restored
indirectly. Our results indicate that the movement of common transportation
vehicles, airplanes, cars, and boats, can be detected and measured.
