README.ANC The files In the \ANCIL subdirectory are the volume descriptor, leader, trailer, supplemental, and null volume files found on Landsat tapes. The following describes the naming convention used for: FULL SCENE, 1600 bpi tapes (ie, 3 tapes/quad, 4 quads/scene) Qntb ||||_ BAND NUMBER |||__ FILE TYPE ||___ QUAD NUMBER |____ Always Q All ancillary file names are prefaced with Q. QUAD NUMBER (n) There are four possible quad numbers in a TM full scene (1-4). Within a TM full scene, the quads are arranged as follows: _______________ | | | | QUAD1 | QUAD2 | |_______|_______| | | | | QUAD3 | QUAD4 | |_______|_______| FILE TYPE (t) The following file types are found on a TM tape: The reference to "Section (S)/Table (T)" in the table below refers to Section/Table numbers in the 1985 User's Guide for Landsat Thematic Mapper Computer-Compatible Tapes. Record Section (S)/ Code Description Length Table (T) V Volume Directory File 360 S5.5 Volume Descriptor Record S5.5.1/T5-4 File Pointer Records S5.5.3/T5-5 L Leader File 4320 S5.5.3,S5.6.1 Leader file Descriptor Record S5.5.3/T5-7 Scene Header Record S5.6.1.1/T5-13 Map Projection Ancillary Record S5.6.1.2/T5-15 Radiometric Calibration Ancillary Record S5.6.1.3/T5-16 D Image File Descriptor Record 4320 S5.5.3/T5-9 T Trailer File 4320 S5.5.3,S5.6.3 Trailer File Descriptor Record S5.5.3/T5-8 Trailer Data Record S5.6.3/T5-19 P Supplemental Volume Directory File 360 S5.5/T5-4 S P-Supplemental File * S5.7 File Descriptor Record 540 T5-10 Band Quality Records 3600 S5.7.1/T5-21 Annotation Record 540 S5.7.1/T5-20 N Null Volume Directory File 360 S5.5 Null Volume Descriptor Record S5.5.1/T5-4 *Note that the P-Supplemental file has been saved as an "unformatted" file such that it is 26280 bytes long with 1 "record" of 540 bytes, 7 "records" of 3600 bytes, and 1 final "record" of 540 bytes. BAND NUMBER (b) Band numbers in a TM scene range from 1-7. Note, there are no band numbers for supplemental files (?, ?) or the null volume directory (N).