thm2isis

Converts a Themis VIS or IR PDS spectral cube into an Isis Cube. The Themis IR cube will automatically be converted to 32-bit floating point unless the user specifies differently by modifying the output files attributes. This is done to accommodate different core/base multiplier values for each band. The output for an ingested Themis VIS cube will be two files, one consisting of even framlets and the other of odd framelets. These framelet files will have the name of the TO parameter with ".even" and ".odd" inserted prior to the ".cub" extension. For example, if the TO parameter was out.cub, the even framelet file of the output would be named out.even.cub.

Description

Must contain a valid Themis EDR or a Themis RDR which has only been through radiometric calibration.

Type	filename
File Mode	input
Filter	*.imq *.img *.QUB

Description

The name of the output Isis cube. If the input cube is a VIS image, the output file will have a ".even" and ".odd" inserted in the output name prior to the ".cub" extension.

Type	cube
File Mode	output
Filter	*.cub

Description

The software assumes that the SCLK (spacecraft clock) recorded for an IR image is the time at which the first detector frame readout occurs. Apparently, the actual first readout can be delayed from this by the following amounts:

8 microseconds - PACI write 
0 to 1/30 sec - delay of the image acquisition after receipt of the command 
0 to 0.1 sec - delay for the command sending by the HPP code so that it is aligned on a 0.1 second boundary 

Currently, the software ignores these three because the 8 microseconds is a negligible fraction of the 1/30 second line rate and the other two are (apparently) variable and unknowable. However, this can result in an incorrect absolute position of as much as four pixels. Similar timing uncertainties probably are applicable to the VIS images. The effect of these timing uncertainties is primarily to potentially introduce errors in absolute coordinates in the along-track direction. This in turn can result in misalignment when mosaicking multiple observations together. The TIMEOFFSET parameter on "thm2isis" allows the user to apply a correction for this time delay, which can thus improve absolute coordinate accuracy and improve mosaic alignments. This offset is stored in the Instrument group of the output Isis cube as SpacecraftClockOffset.

Type	double
Default	0.0

This program imports both Themis VIS and Themis IR images. Themis VIS images are split into even and odd files.

thm2isis from=V04860003EDR.QUB to=V04860003EDR

Running thm2isis

The GUI when running this program This is what the interface looks like when you run this program.

Raw EDR

The input EDR V04860003EDR This is the input raw data

Output Isis Cube (odd)	The output odd themis vis cube This is the odd framelets output cube "V04860003EDR.odd.cub"
Output Isis Cube (even)	The output even themis vis cube This is the even framelets output cube "V04860003EDR.even.cub"