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.

iTools displays

iTools displays "No Valid LangCat"

12/11/2014

Problem:  If you are using iTools to visualize some data (for example using iimage), it is possible for all the menu items to say "No Valid LangCat" instead of what they should say. Solution: This usually indicates that IDL is unable to find the catalog files located in the directory shown below: IDL_DIR/resource/langcat/itools There ... more »

How to find the overlap of two images with the ENVI API

How to find the overlap of two images with the ENVI API

12/2/2014

There is a task called ENVIImageIntersectionTask that takes two input rasters and outputs two rasters that contain data from each input raster subset to include only the area of overlap. The following code can be used to get the image data from the intersection (overlap) and union of two images. In this example, the two rasters are subset from ... more »

Approve
Example how to write large data to an HDF5 file piece by piece

Example how to write large data to an HDF5 file piece by piece

11/21/2014

Topic: This article shows an example of how to write a large set of data to an HDF5 file by breaking it down into smaller pieces and writing it to the file piece by piece.  Discussion: The program "test_write_h5d" (shown below) generates a set of data that is random is size*. It then creates a HDF5 file and opens it. The data is then ... more »

How to Calibrate NLAPS Landsat Data in ENVI

How to Calibrate NLAPS Landsat Data in ENVI

11/21/2014

According to the USGS, all Landsat data are currently processed through their LPGS system. These datasets contain metadata in a MTL.txt file, which accompanies all data files. Some available Landsat 4 and 5 data were processed using the NLAPS system. NLAPS metadata is contained in a .WO file, which accompanies all data files.  ENVI's ... more »

Some Information About ENVI LiDAR's Tree Extraction Algorithm

Some Information About ENVI LiDAR's Tree Extraction Algorithm

11/18/2014

While the exact algorithms used to extract features from LiDAR data using ENVI LiDAR are considered proprietary, our developers are often happy to help answer questions that come up about how those algorithms work. Here are answers to a couple of common questions about ENVI LiDAR's tree extraction algorithm. Question: How does the tree ... more »

12345678910 Last

FEATURED HELP ARTICLE

Exelis VIS Technical Support Policy Updates

9/25/2014

Maintenance Program Changes and Reminders: All customers must be current on maintenance to receive ... more »

MOST POPULAR

© 2014 Exelis Visual Information Solutions