Technical Issues and Challenges

Example: Positional correlation of objects in a region of the sky across multiple wavelengths (Radio, IR, Optical, UV, X-rays, Gamma Rays)

• Data volume and network bandwidth

  • Cache of pre-computed results (e.g., astronomical catalogs)
  • Data filtering at data site, ship results only
  • Deployment of user code (platform independent S/W)
  • Data visualization for exploration and selection

• Registration, Sensitivity, Positional Accuracy

  • Coordinate transformation on a large scale
  • Calibration and normalization

• Query Optimization across Multiple Sites

  • Query execution plan for efficient cross-correlation
  • Indexing for fast access