Footprints in the Hubble Legacy Archive

Computer Science – Performance

Scientific paper

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Scientific paper

Footprints are geometric outlines of observations. They are displayed against a background image. The observations of the Hubble Space Telescope are defined by a set of hierarchical geometric regions of instrument coverage: exposures, combined observations, high level science products, and mosaics. In the growing global community of networked applications, the science end-user has several use cases for visualizing and accessing footprint data including scientific proposal preparation, research and analysis of generated science products, and interoperability between archives for correlation of coverage. The Hubble Legacy Archive (HLA) at Space Telescope Science Institute, in coordination with ESO-ECF and CADC, has developed a web based science user interface built on a VO service oriented architecture system to enable varying levels of astronomical community access to science products derived from the HST archive. We describe new features and technologies for the HLA footprint component web browser visualization tool and the underyling footprint services utilized by the HST Astronomers Proposal Tool (APT) in compliance with an IVOA standard data access protocol. The service infrastructure is based on a high performance spherical geometric model developed by Johns Hopkins University (JHU) and database search algorithms co-developed by STScI and JHU.

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