HELP ARTICLES

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

Finding multiple local max/min values for 2D plots with IDL

7/2/2015

As is, IDL does not have a built in function to find multiple local maximums or minimums for 2D plots. Luckily, there is a simple algorithm that can be applied to a data set to determine if a point is a maximum or minimum. The algorithm works by checking the point to the left and to the right for the i-th point and seeing if the i-th point ... more »

An example of performing band math with the new ENVI API

7/1/2015

  Performing band math with the new ENVI API can be a little daunting compared to the simplistic approach of the ENVI Classic routines such as MATH_DOIT. While there is some overhead associated with how to use IDL with the new ENVI API, this example makes use of the tile iterator which can be used to greatly speed up processing time and ... more »

How to programmatically access the transformation matricies of the ICA .trans file

6/19/2015

The Independent Components (IC) analysis is used to transform a set of mixed, random signals into components that are mutually independent for multispectral or hyperspectral datasets.  The ICA transform produces a transformation matrix of the forward and backward transformation coefficients that are stored in a '.trans' ... more »

How to access the items stored in the ENVI metadata object of an ENVIRaster

6/17/2015

The below example shows how you can access and save the items in the ENVI metadata object of an ENVIRaster.  This can be useful if you need to save these items for other processes.  Example commands: ;open a raster ENVI>raster = 'C:\Program Files\Exelis\ENVI52\data\qb_boulder_msi' ENVI>in_raster= ... more »

How to extract and apply LAS classification RGB values to a point cloud using the programming interface (API)

6/11/2015

The following example code show how to access the classification values in a LAS file and create a new project file that will display the point cloud by the classification RGB values.  This example uses the default Computed Classification Values described in the ENVI Lidar help.  The values may vary depending on the LAS file ... more »

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FEATURED HELP ARTICLE

ENVI 5.4 / IDL 8.6 Quick Start Install and Licensing Guide

12/6/2016

Below is a quick start guide to follow to download and activate your ENVI 5.4 and/or IDL 8.6 software once ... more »

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ENVI Pocket Guide Vol. 1 | Basics

An ENVI quick reference booklet that provides users succinct steps on how to accomplish common tasks in ENVI.

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