PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM DATA_SET_ID = "NEAR-A-MAG-3-RDR-CRUISE4-V1.0" OBJECT = TEXT PUBLICATION_DATE = 2013-03-30 NOTE = "Errata: known errors/anomalies in volumes" END_OBJECT = TEXT END Non-Standard Practices The PDS standards do not specify where to store the required MD5 checksum file for a volume. We have placed it in the root dircetory of the volume with the file name "CHECKSUMS.TXT". This may be considered invalid by some verifiers. ERRATA.TXT - Contains text information describing errors and/or anomalies found in the current dataset as well as errors and/or anomalies found in previous volumes of a volume set. Date Comment 01-31-02 IMPORTANT NOTES ON DATA: The NEAR magnetometer data were sometimes sampled at uneven time intervals. Please take note of this fact, especially if you are calculating power spectra or performing other calculations that presuppose a uniform time interval for the data. The NEAR MAG data files contain periodic calibration events, thruster firings, and telemetry errors that appear as data spikes. These events have not been removed from the data files. The large events that persist for tens of records or more, depending on the telemetry rate, are the calibrations. Short duration events are more difficult to classify in general. Some of these events are associated with spacecraft propulsion events. Others are of an unknown origin and may be telemetry errors. 07-15-01 The following files contain lines longer than 80 characters: /DOCUMENT/MAG_SW/SCI_PROC.TXT /DOCUMENT/MAG_SW/SDC_PROC.TXT 09-01-01 The ASCII documents in the /DOCUMENT directory have extension .TXT rather than .ASC. 09-01-01 The GEOMETRY directory does not contain the SPICE files associated with this phase of the mission. The NEAR GEOMETRY datasets are grouped by phase as follows: Phase PDS Volumes ----------- --------------------------- CRUISE1 NGCRU1_0001 MATHILDE NGMATH_0001 CRUISE2 NGCRU2_0001 EARTH/FLY/BY NGERTH_0001 CRUISE3 NGCRU3_0001 EROS/FLY/BY NGERFB_0001 CRUISE4 NGCRU4_0001 EROS NGEROS_0001 - NGEROS_0004 EROS/SURFACE NGERSF_0001 02-01-02 The DATA_SET_ID values for these datasets, found in the MAGL2DS.CAT files and elsewhere, do not all meet the customary standards for PDS data set IDs. In particular, the parts of the IDs representing the mission phases should contain hyphens rather than slashes. These data set IDs are being kept as they are to maintain consistency with earlier NEAR data set IDs. 06-25-02 Some of the RDR data files contain flag values of -99.99 in the data and spacecraft position columns. These values may be reflected in some of the PDF and Splash plots on these volumes. A few files in NMEROS_2002 (namely, EBF00278.TAB, NSO00278.TAB, EBF00282.TAB, and NSO00282.TAB) contain an additional missing-data value, +1.0E32. The PDF and Splash plots are scaled so as to remove data spikes due to propulsion events and similar sources. Some plots may appear to be scaled incorrectly; this is because the data contain large changes due to calibration events or other unusual occurrences within the data. 07-05-06 The files CHECKSUM.* in the INDEX directory are not listed in the MANIFEST.TAB file (or in the CUMMANIF.TAB file for disks that have one).