Voyager Images and Isis3, applications and methods Options

[JohnVV]

read through and run the examples in the Workshop
https://isis.astrogeology.usgs.gov/IsisWork...hp/IsisWorkshop

isis3 can be a bit daunting .
First the linux requirement ( there is a mac port)
the rhel 6 build runs just fine on ( i have tested )
CentOS 6.8
ScientificLinux 6.7 ( will be 6.8 soon )
Opensuse 13.2 and 42.1
-- WARNING on Fedora - has issues

Then the old Voyager data

Those that have been fallowing any of the reprocessing threads have seen the images
missing lines and reseaus marks and it is 8 bit

and searching for data can be a problem
unless you are just garbing it all

for this post i am using a few Blue,Green and Orange ( no red filter) ( orange and blue make red )
and using the pds atlas
http://pds-imaging.jpl.nasa.gov/search/
-- WARNING!!!!!!
this archive sends isis3 incompatible "img" files !!!
the wget script needs to be "CORRECTED!!!

for example the "atlas_wget_script" give this

CODE

wget -O c1113006.img 'http://pds-imaging.jpl.nasa.gov/pds/prod?q=OFSN+%3D+/data/voyager//vg_0010/extras/pds/neptune/c1113xxx//c1113006.img+AND+RT+%3D+RAW'
wget -O c1113017.img 'http://pds-imaging.jpl.nasa.gov/pds/prod?q=OFSN+%3D+/data/voyager//vg_0010/extras/pds/neptune/c1113xxx//c1113017.img+AND+RT+%3D+RAW'
wget -O c1113039.img 'http://pds-imaging.jpl.nasa.gov/pds/prod?q=OFSN+%3D+/data/voyager//vg_0010/extras/pds/neptune/c1113xxx//c1113039.img+AND+RT+%3D+RAW'

these img files can not be opened with "voy2isis"
You need the imq ( Q on the end )
a simple edit of the script will solve this

--fixed--

CODE

wget -O c1113006.imq 'http://pdsimage.wr.usgs.gov/archive/vg1_vg2-n-iss-2-edr-v1.0/vg_0010/neptune/c1113xxx/c1113006.imq'
wget -O c1113017.imq 'http://pdsimage.wr.usgs.gov/archive/vg1_vg2-n-iss-2-edr-v1.0/vg_0010/neptune/c1113xxx/c1113017.imq'
wget -O c1113039.imq 'http://pdsimage.wr.usgs.gov/archive/vg1_vg2-n-iss-2-edr-v1.0/vg_0010/neptune/c1113xxx/c1113039.imq'

the voyager " *.imq " files are gziped compressed archives

isis3 has BUILT IN batch support -- very handy

to ingest into isis3 and also get a "preview" image i use this script

CODE

#!/bin/sh
ls *.imq | sed s/.imq// > cube.lis
voy2isis from=\$1.imq to=\$1.cub -batchlist=cube.lis
spiceinit from=\$1.cub -batchlist=cube.lis
voycal from=\$1.cub to=\$1.cal.cub -batchlist=cube.lis
isis2std from=\$1.cal.cub to=\$1.png minpercent=0.1 maxpercent=99.9 -batchlist=cube.lis

i have now a calibrated and geo-referenced image
these images


and they need work ( the pointing data is OFF - hay this is from Voyager after all )


( preview of "c1113006" using isis3's "Grid " program )


i will worry about that later

the spiceinit'ed and voycal images are now 2.5 Meg 32bit float images -- "c1113006.cal.cub"
have a look in Qview

CODE

qview c1113006.cal.cub

-- if you are going to use the built in isis3 tools then leave the NULL pixels and do not run stretch

-- for using gimp or other tools

the missing lines are "NULL" data ( px value -3.8 E^38 )
and some low instrument values that are negative pixel values
-- for cleaning up and exporting the images to Gimp2.9.3 ( or Krita )these need to be zero

a handy isis3 tool is "stretch "

CODE

stretch from=c1113006.cal.cub to=c1113006.cal1.cub null=0.0 lis=0.0

on to exporting it to a RAW image so it can be cleaned up and then moved back into isis3
best done in a new sub folder

CODE

cubeatt from=c1113006.cal1.cub to=c1113006.cal1.raw+BSQ+detached

you now have a raw and detached headers
( rename c1113006.cal1.raw.cub to c1113006.cal1.raw )