TRIMMER
Description
TRIMMER is designed for a flyby situation where some parts of the body are never seen in any of the images. It uses the sumfiles for each image in an input list to identify what parts of the image are visible to the camera and which parts of the image are illuminated. TRIMMER determines where the shape model is visible and illuminated but, according to the images and their sumfiles, shouldn’t be (i.e., things that stick up too far). After identifying these areas, TRIMMER trims them down in the radial direction by a specified amount. It whittles down the shape until the areas of the shape model that are supposed to be in the dark are indeed in the dark. TRIMMER can also “pump” up areas of the shape that are too low, but Bob says that you can get in trouble using this feature and it has not been tested for DART.
TRIMMER does not affect maplets; it only affects the shape model. The trimmed shape model can then be dumbed down and used in densify, for example. However, TRIMMER distinguishes between areas of the shape covered by maplets vs. areas with no maplet coverage. TRIMMER relies on COVERAGE.TXT for maplet coverage, so you can fool TRIMMER into thinking that an area is not covered by maplets by changing the inputs to shape_coverage. In order to TRIMMER to fully operate on all parts of the shape, shape_coverage must find no maplets.
Test