PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2016-12-19 INTERCHANGE_FORMAT = ASCII NOTE = "Errata for the Mars Exploration Rover 2 Operations Meshes and Wedges." END_OBJECT = TEXT END This document describes errors concerning the MER2 Operations Meshes and Wedges image archive. Please keep checking back for updates as it is currently under construction. 1. SCLK inaccuracy Label keywords, SPACECRAFT_CLOCK_START_COUNT and SPACECRAFT_CLOCK_STOP_COUNT may not actually reflect the correct values for the range of images that comprise the mesh. It is also possible for the values of these keywords to be outside the range of those values extracted from all the images used. When computing the SCLK for a multi-instrument mesh, all input images are cycled through based on the individual image frame information embedded within the header of the performer binary format (PFB) mesh product. The SCLK values of the last image frame processed are extracted and copied to the label. This is not correct as it does not cover the entire range of images that comprise the mesh. 2. Terrain Mesh file naming convention Per the MER SIS, Terrain Mesh file naming convention is defined on pg. 34, and states that the filename should follow the format, mesh_[x]__[x]_[-]_[x]_v, where "ver = (N integers) Version identifier providing uniqueness for book keeping". However, there are numerous files that use alpha characters (i.e. A) to represent the version instead of using the expected "10". The SIS explicitly notes that "ver" should be denoted with N integers, which is not true in some cases. 3. "Position-within-Site count" greater than 1295 There are data products that have double underscore, "__", for characters 17-18 in the filename, which is the “Position-within-Site count”. This means the value is greater than 1295. It can be retrieved from the PDS label in the following way: The keyword "COORDINATE_SYSTEM_INDEX", within the "ROVER_COORDINATE_SYSTEM" Group, contains 5 indexes. Each index provides unique information about the rover and its movable mechanisms. The information of interest is the "Drive" index which is the 2nd index. It is an integer value. Another PDS keyword to look at for rover Position would be "ROVER_MOTION_COUNTER", which has the same design as "COORDINATE_SYSTEM_INDEX".