HELP ARTICLES

Help Articles are product support tips and information straight from the Exelis VIS Technical Support team developed to help you use our products to their fullest potential.

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Using IDL and ENVI on Mac OS X Requires X11/XQuartz

Using IDL and ENVI on Mac OS X Requires X11/XQuartz

10/17/2014

PROBLEM: Running IDL and ENVI on Mac OS X requires the installation of X11/XQuartz on the system. X11/XQuartz does not come pre-installed on Mac OS X and requires a separate download and installation of this product. Here are some example symptoms of using IDL on a Mac OS X system without X11/XQuartz: * The IDL Workbench can be started but ... more »

Editing Pixel Values in ENVI

Editing Pixel Values in ENVI

10/13/2014

You can edit pixel values within an image that is open in ENVI using one of ENVI's Profile tools (Spectral, Horizontal, Vertical or Arbitrary). These tools can be found in multiple places in the ENVI interface.  All Profile tools can be found by right clicking on a layer name in the Layer Manager, and choosing Profiles. They can also all ... more »

How to change the class names and colors of an ENVI classification image in ENVI 5.x

How to change the class names and colors of an ENVI classification image in ENVI 5.x

10/7/2014

Sometimes it is desirable to change the names and colors of a classification image to better represent the classes and make it more visually informative.  This may be especially true if using an unsupervised classification result in which the names and colors of the classes are automatically selected by ENVI. Currently in ENVI ... more »

How to Assign  Pixels with Negative Values a Value of 0

How to Assign Pixels with Negative Values a Value of 0

10/2/2014

Question: How can I find all of the pixels in my image that have negative values and give them a new pixel value of 0? Answer: You can do this using ENVI's Band Math tool, with the following expression:    b1*(b1 gt 0.0) This expression will return a floating point image in which all of the pixels less than or equal to 0.0 are set ... more »

What Warp Method Does ENVI's Layer Stacking Tool Use?

What Warp Method Does ENVI's Layer Stacking Tool Use?

10/2/2014

Question: What warp method does ENVI's Layer Stacking tool use?

Answer: ENVI's Layer Stacking tool performs Delauney triangulation using a grid of 50 x 50 points across the input data.

 

Review on 10/2/2014 PS, KK

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FEATURED HELP ARTICLE

The Exelis VIS Extensions Library

5/7/2014

The Extensions Library is now available on the Exelis VIS website The Extensions library gives you ... more »

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