Software, Open Access, GMT, GIS, ISIS, Education

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Tell Me About ISIS

Jumping off from this discussion, I'd like to hear more about what ISIS is all about, and whether I should consider using it. I work primarily with Cassini ISS data, and my main issue is that, since I work with rings, I'm interested in a cylindrical coordinate system rather than a spherical one. My other issue is that I'm accustomed to using IDL rather than C++, but I could consider changing if other issues came together.

importing MOC into GMT with grdraster

Hi. Has anyone successfully imported MOC images into GMT using grdraster? I have been working on this for over a week, and I (as well as several others helping me) have had no luck. Some issues:

1. Should the MOC images, processed with ISIS, be map projected or not? Altered with mocaspect?

2. What files are acceptable as input to grdraster? I found online that .bmp, .gif, .jpeg, .jpg, .tif, and .wbmp are raster images. I am only able to get my files into .tif, .raw, or .bmp files (ISIS2 dform and ISIS3 isis2std aren't working properly on the machines I use). I have not managed to get any of these data types into GMT (problems with -I (increment) and/or data type definitions in grdraster.info file).

Image interpolation

Not all images are the same. Frequently, to do science you might want to compare two different images at the same resolution, or map them to the same grid, different from the original. To map to lower resolution you should co-add pixels, but to map at a higher resolution you might need to interpolate. This article discusses four interpolations schemes, how to use them, and which might be best for you.

point photoclinometry / stereo images

Hi. I am looking into doing point photoclinometry for certain regions of Mars. I know how to process MOC images with ISIS, but does anyone know how to get the raw DN values of each pixel? Also, has anyone used SOCET SET to make stereo images?

Putting arrows on figures using the GIMP

In many instances, images can speak for themselves. However, one often wants to put arrows or indicators on an image mentioned in the caption or the text. This article explains a few ways to do that with the GIMP.

qview measure

I am using ISIS2 and qview to look at processed MOC cubes. When I try to use the qview measure tool, one end of the measuring line is always trapped in the upper left hand corner. Has anyone else experienced this and/or found a way to fix this?

MGS data tools

Not quite sure where to start with data from the Mars Global Surveyor spacecraft? This article contains links to the raw data, and also links to the various software tools that members of the community have created to analyze the data itself.

Easy generation of animations

Some images are worth 1000 words. Similarly, some movies, or animations, are worth 1000 images, even if they are made up of fewer. What I'm trying to say is that there are some concepts which are better illustrated using animations rather than just graphs or images. Hal Levison, for example, shows movies of orbits changing as a function of time that give a better impression of orbital evolution, and in less time, than a succession of plots. Strategic use of animations really increases the amount of understanding that you can transmit to your audience in a 7-minute talk. Generating simple animations is easy using the command-line-driven ImageMagick software.

MOLA maps with GMT

Creating shaded relief maps or combination colorized/shaded relief maps with MOLA data is easy to do with the Generic Mapping Tools (GMT).

Importing MOLA data into GMT

The MOLA gridded data set is a great resource. The Generic Mapping Tools (GMT) are a great tool set. This article shows you how to take the raw binary MOLA gridded data set and convert it into the netCDF format that GMT uses. Once you do that, a whole range of mapping options are open to you.

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