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- o VICAR (VAX/VMS).
-
- The image processing program used at JPL. Has been under continuous
- development since the 1960's. Available from the Computer Software
- Management and Information Center (COSMIC) for $4000 and requires a
- license agreement. Contact COSMIC at the following for more details:
-
- COSMIC
- The University of Georgia
- 382 East Broad Street
- Athens, GA 30602
-
- Telephone: (404) 542-3265
-
- Email: cosmic@uga.bitnet (bitnet)
- service@cossack.cosmic.uga.edu (internet)
-
- o IMDISP (IBM PC).
-
- Written by myself and Mike Martin at JPL, and Archie Warnock at Goddard
- Space Flight Center. Available via anonymous ftp at ames.arc.nasa.gov
- [128.102.18.3] in the pub/SPACE/SOFTWARE directory, under the file
- imdisp56.zip. IMDISP is on the GRIPS 2 CDROM, and can also be obtained
- free from the National Space Science Data Center (NSSDC) at the Goddard
- Space Flight Center:
-
- National Space Science Data Center
- Request Coordination Office
- Goddard Space Flight Center
- Code 633
- Greenbelt, MD 20771
-
- Telephone: (301) 286-6695
-
- Email address: request@nssdca.gsfc.nasa.gov
-
- Incidently, this is also the same place you can get the Voyager and
- Magellan CDROMs.
-
- o PixelPusher (Macintosh).
-
- Written by Dan Stanfill at JPL. Available on the GRIPS 2 CDROM, and I'm
- working on making it available via anonymous ftp.
-
- o xloadimage (Sun).
-
- Written by Herr Frost. Available via anonymous ftp at
- export.lcs.mit.edu [18.30.0.238] in the contrib directory. The patches
- to support VICAR are in a separate file at convex.com [130.168.1.1] and
- are in pub/xl.3.0.1.patches.Z. Anthony Datri wrote the VICAR patches.
-
- *************
- ___ _____ ___
- /_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
- | | | | __ \ /| | | | Jet Propulsion Lab |
- ___| | | | |__) |/ | | |__ M/S 301-355 | "Imagination is more
- /___| | | | ___/ | |/__ /| Pasadena, CA 91109 | important than knowledge"
- |_____|/ |_|/ |_____|/ | Albert Einstein
-
- ===========================================================================
-
- VICAR2 IMAGE FILE FORMAT
-
-
- 1 Introduction
-
- This document describes the format of a simple two-dimensional
- VICAR2 image and the attached label.
-
- 2 VICAR2 File Format
-
- A VICAR2 image file in its simplest form is a file with fixed-length
- records containing binary data and an ASCII label. The label takes up
- one or more records at the beginning of the file, and is further
- described in section 3 below. The image data begins on the next record
- boundary after the label. There is one record per image line, and the
- number of bytes in a record is equal to the number of bytes in one image
- line. The image data can be any one of the following data types,
- indicated by a keyword in the image label:
-
- BYTE: 8 bits = VAX byte
- HALF: 16 bits = 2 bytes = VAX word = Fortran INTEGER*2
- FULL: 32 bits = 4 bytes = VAX longword = Fortran INTEGER*4
- REAL: 32 bits = 4 bytes = VAX longword = Fortran REAL*4
- DOUB: 64 bits = 8 bytes = VAX quadword = Fortran REAL*8
- COMPLEX: 64 bits = 8 bytes = VAX quadword = Fortran COMPLEX*8
-
- 3 VICAR2 Label Format
-
- The VICAR2 label is in the form of an ASCII character string,
- beginning at the first byte in the first record in the file. The label
- may take up one or more records at the beginning of the file. If the
- character string does not completely fill the final label record, the
- remaining bytes in the record are set to the ASCII null value,
- hexadecimal 00.
-
- In some cases there may be an additional label record at the end of
- the file, following the image data. This is indicated when the keyword
- EOL has the value 1 (see description of keywords below).
-
- 3.1 The Keyword=Value Format
-
- The label uses the KEYWORD=VALUE format for storing information
- about the image. A list of standard keywords is given in section 3.3.
- The maximum length of a keyword is 8 characters. A keyword is written
- in all capital letters and is followed by an equals sign (=), which is
- in turn followed by the value for the keyword. There are no spaces on
- either side of the equals sign. The value is followed by one or more
- spaces, in order to separate one KEYWORD=VALUE pair from the next. Here
- is an example of one label item following another:
-
- RECSIZE=1024 NL=1324
-
- A keyword value may be one of four data types:
-
- INTEGER A positive or negative integer including 0 which
- does not contain a decimal point.
- REAL A positive or negative number with a decimal
- point and, optionally, an exponential (E+06, for
- instance).
- DOUBLE A real number with enough digits to make it
- double-precision.
- STRING A string delimited by single quotation marks (')
- containing any printable ASCII characters and
- spaces EXCEPT the single quotation mark. The
- maximum length of a string is 512 characters,
- and the minimum length is 1 character.
-
- The first keyword in the label is always LBLSIZE, which specifies
- the total number of bytes in the label, including any null bytes at the
- end. Thus LBLSIZE will always be a multiple of the file's record size.
-
- 3.2 Two Parts of a VICAR2 Label
-
- A label has two sections, the system label items and the history
- label items. History label items are added to the label during
- processing with VICAR software. It is possible for a label to contain
- no history label items. If history label items do exist, they always
- occur at the end of the label, following the last system label item.
- The beginning of the history label section is marked by the occurrence
- of the keyword TASK.
-
- Thus, the system section of the label begins with the keyword
- LBLSIZE, and ends in one of these three ways:
-
- o with the appearance of the keyword TASK, which marks the
- beginning of the history section of the label, OR
-
- o with the appearance of an ASCII null value, hexadecimal 00, which
- marks the end of the VICAR2 label (in which case there are no history
- label items), OR
-
- o after the number of characters specified by LBLSIZE (in which
- case there are no history label items).
-
- 3.3 Standard Label Keywords
-
- Here is a table of standard VICAR2 label keywords, divided into
- system label items and history label items. Those marked with an
- asterisk (*) are required to be present in order for the VICAR image
- processing software to be able to process the label. LBLSIZE will
- always be the first keyword in the label. The other system keywords may
- follow in any order.
-
- STANDARD VICAR2 LABEL KEYWORDS
-
- SYSTEM LABEL ITEMS
-
- KEYWORD TYPE MEANING
-
- LBLSIZE* integer The length in bytes of the VICAR
- label, including null bytes at the
- end.
-
- BUFSIZE* integer The default blocksize used when the
- file is written to tape.
-
-
- DIM integer The dimension of the file (for flat
- files, always 2).
-
- EOL integer EOL=1 indicates that an end-of-file
- label exists. In most cases EOL=0;
- i.e., there is no end-of-file label.
-
- FORMAT* character The data type of a sample. Valid
- values are: BYTE, HALF (16-bit
- integer), FULL (32-bit integer), REAL
- (32-bit floating-point), DOUB (64-bit
- floating-point) and COMPLEX (2 32-bit
- floating-points).
-
- HOST character Type of host computer. The only
- current legal value is 'VAX-VMS'.
-
- INTFMT character The integer format for the file. The
- only current legal value is 'LOW'.
-
- N1 integer Same as NL for simple files.
-
- N2 integer Same as NS for simple files.
-
- N3 integer Same as NB for simple files.
-
- N4 integer Always 0 for simple files.
-
- NB integer The number of bands. For simple
- files, always 1.
-
- NBB integer Number of bytes in the binary prefix
- to each line. Always 0 for simple
- files.
-
- NL* integer The number of lines in the image.
-
- NLB integer The number of lines of binary header.
- Always 0 for simple files.
-
- NS* integer The number of samples per image line.
-
- ORG character The organization of the file. For
- simple files this is always BSQ (band
- sequential).
-
- REALFMT character The real format for the file. The
- only current legal value is 'VAX'.
-
- RECSIZE* integer The number of bytes per record; i.e.,
- NS*LEN, where LEN is the number of
- bytes per sample as follows:
-
- FORMAT: LEN:
- BYTE 1
- HALF 2
- REAL,FULL 4
- DOUB,COMPLEX 8
-
-
- HISTORY LABEL ITEMS
-
- KEYWORD TYPE MEANING
-
- DAT_TIM character The date and time the program was run.
- The format is DOW MON DD HH:MM:SS
- YYYY, where
-
- DOW = day of week (Mon, Tue, Wed,
- etc.),
- MON = month (Jan, Feb, Mar, etc.),
- DD = day of month,
- HH:MM:SS = hours, minutes, seconds,
- YYYY = year.
-
- An example of a date and time in this
- format is 'Mon Jan 11 21:51:55 1990'.
-
- TASK character The name of a VICAR program that has
- processed the file's data.
-
- USER character The identifier of the user that
- invoked the program represented by the
- preceding TASK keyword.
-
- The history label section may also contain other keywords that are
- specific to the program that was run. These are sometimes called user
- labels. They are informational only; they are not interpreted by VICAR
- software, but they are copied from input file to output file with the
- other label keywords.
- *******************
-
-
-