The UVBrick is used for predicting uv-data of extended sources or of multiple point sources. In order to do so it takes a Sky Image (LSM Patch Image) and FFTs it into an image of uv-data (UVImage). The UVBrick is implemented in the MeqTree system by two nodes: the MeqUVBrick, which contains an image of predicted uv-data, and the MeqUVInterpol, which fills a Request Cells / Vells using the data from the MeqUVBrick.
A MeqTree containg the MeqUVBrick and the MeqUVInterpol: UVBrick_tree.eps
Mapping the Request Cells onto the UVImage: UVBrick_interpolation.eps
The UVBrick is described in more detail in the following document: UVBrick.pdf