Routines for converting to and from VICAR image files
Project description
Introduction
vicar
is a Python module that supports reading and writing of JPL's VICAR file format. It supports the definition of the VICAR file format as found here:
https://pds-rings.seti.org/help/VICAR_file_fmt.pdf
Installation
The vicar
module is available via the rms-vicar
package on PyPI and can be
installed with:
pip install rms-vicar
Getting Started
The vicar
module provides these classes:
VicarLabel
: Class for reading, writing, and parsing of VICAR labels.VicarImage
: Class for handling VICAR image (and other) data files.VicarError
: Extension of class ValueError to contain exceptions.
Details of each class are available in the module documentation.
To read a VICAR image file:
import vicar
vic = vicar.VicarImage("path/to/file")
The resulting object contains:
vic.array
: The 3-D data array converted to native format.vic.array2d
: Same as above, but with leading dimension (typically, bands) stripped.vic.prefix
: The array prefix bytes as a 3-D array of unsigned bytes.vic.prefix2d
: Same as above, but with the leading dimension stripped.vic.binheader
: The binary header as a bytes object; usevic.binheader_array()
to extract information.vic.label
: The internalVicarLabel
object that manages the VICAR label information, if direct access is needed.
VICAR parameter values can be extracted from the label using dictionary-like syntax:
len(vic)
: The number of parameters in the VICAR label.vic['LBLSIZE']
: The value of the LBLSIZE parameter (an integer).vic[0]
: The value of the first parameter.vic[-1]
: The value of the last parameter.vic['LBLSIZE',-1]
: The value of the last occurrence of the LBLSIZE parameter.vic.get(('LBLSIZE',2), 99)
: The value of the third occurrence of the LBLSIZE parameter, or 99 if there are fewer than 3 occurrences.vic.arg('LBLSIZE')
: The numeric index of "LBLSIZE" among the VICAR parameters.
You can also use dictionary-like syntax to modify and insert header values:
vic['SOLDIST'] = 1.e9
: Set SOLDICT to this value.del vic['SOLDIST',0]
: Remove the first occurrence of SOLDIST from the label.vic['LBLSIZE+'] = 2000
: Insert a new LBLSIZE parameter instead of modifying an existing one.
Note that certain required VICAR parameters contain structural information about the file; these cannot generally be modified directly.
Numerous methods are available to iterate over the VICAR label parameters:
for (name,value) in vic.items(): ...
for key in vic.keys(): ...
for name in vic.names(): ...
for value in vic.values(): ...
Iterators can take a regular expression as input to restrict the items returned:
for value in vic.values(r'LAB\d\d'): ...
Use str(vic)
to get the VICAR label content represented as a string.
Here are the steps to create and write a VICAR image file:
import vicar
vic = vicar.VicarImage()
vic.array = array
vic.prefix = prefix
vic.binheader = binheader
vic['NOTES'] = ['add as many more VICAR parameters', 'as you wish']
vic.write_file("path/to/file")
Contributing
Information on contributing to this package can be found in the Contributing Guide.
Links
Licensing
This code is licensed under the Apache License v2.0.
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