azavea/geotrellis — pull request #285 by joshmarcus (2012-12-19 19:11:46+00:00)
Title: Add operation for parallel execution of zonal operations.

This checkin implements the necessary infrastructure to execute a
zonal operation in parallel over a tiled raster.

This checkin does not include sufficient tests and this implementation
still needs to be refined and further tested. It adds a HasAnalysisArea
trait to zonal operations required for TileFocalOp.