  We created the Herschel Footprint Database and web services for the Herschel
Space Observatory imaging data. For this database we set up a unified data
model for the PACS and SPIRE Herschel instruments, from the pointing and header
information of each observation, generated and stored sky coverages
(footprints) of the observations in their exact geometric form. With this tool
we extend the capabilities of the Herschel Science Archive by providing an
effective search tool that is able to find observations for selected sky
locations (objects), or even in larger areas in the sky.
