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.

Where Can I Find a Spectral Library to Use for My Project

Where Can I Find a Spectral Library to Use for My Project

8/29/2014

A common workflow in multispectral or hyperspectral data analysis is to compare spectra derived from image data to those collected in the field or laboratory. Collections of lab or field spectra are often referred to as spectral libraries. Included with your installation of ENVI are several groups of laboratory spectra from the NASA Jet ... more »

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Using Training Data From One Image to Classify Another Image

Using Training Data From One Image to Classify Another Image

8/29/2014

It is possible in ENVI to set up training data on one image, and then use those training data when classifying other images. You can do it interactively (within the ENVI GUI) or in batch code. To do it in the GUI, first search for Endmember Collection in the ENVI toolbox. When you double click on that tool, you will see a file selection ... more »

Determining the Block Size For NITF Files

Determining the Block Size For NITF Files

8/28/2014

Question:  How does ENVI determine the block size that it uses when writing NITF format files? Answer: When writing NITF files from the ENVI interface, the block size that is used depends on the dimensions of the image.  If the number of rows and columns is less than 4096, the block size is set to the full image size. For larger ... more »

Spectral Library Exchange Format (SLEF)

Spectral Library Exchange Format (SLEF)

8/28/2014

Question:  What is the Spectral Library Exchange Format (SLEF) that some of ENVI's THOR tools can work with? Answer: The SLEF is a "format" that was developed by a number of intelligence agencies that were dealing with spectral signature data and wanted a common way to store not just signature data, but also metadata (classification, ... more »

Does ENVI LiDAR Use Multithreading During Processing?

Does ENVI LiDAR Use Multithreading During Processing?

8/28/2014

Question:  Does ENVI LiDAR have multithreading capabilities?  A customer is building a system on which to use ENVI LiDAR and he’d like to know whether to invest in RAM or multiple cores. Answer: Yes, it does use multithreading while processing. In the current version more cores would yield better performance than more memory, ... more »

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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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