ERDAS Imagine – Earth Resources Data Analysis System

Remote Sensing and Image Processing Software

ERDAS Imagine - Earth Resource Development Assessment System
ERDAS Imagine - Earth Resource Development Assessment System

Last Updated: Aug 29, 2017

ERDAS Imagine Software

The year was 1978 when ERDAS Imagine (ERDAS 4 at the time) was first launched using a hard drive the size of a small washing machine.

Up to the present time, ERDAS Imagine has been re-worked and is still one of the best in the business

While it excels in being user-friendly, the tab interface helps keep all your tools in order including image processing, classification, photogrammetry, LiDAR, radar and all aspects of remote sensing.

Today, we highlight why ERDAS Imagine is Hexagon Geospatial’s flagship image processing software.

1 The Viewer

The viewer is sharp, it’s expandable… Not to mention, it has an uncanny ability to read any format you throw at it. For example, it’s compatible with a range of satellites like Landsat, Worldview, Sentinel, SPOT and AVHRR.

This means that it’s intelligent enough to read your image and deliver canned composites. Equally important, you can organize the spectral bands as you choose for composites of your own.

ERDAS Imagine Tokyo

ERDAS Imagine will pan-sharpen your image for crisper outputs given a panchromatic band.

Read More: 15 Free Satellite Imagery Data Sources

2 LiDAR Tools




Light Detection and Ranging (LiDAR) is the new authoritative data set.

LiDAR actively sends light energy to the ground. It measures reflected light in time back to the sensor to get distance. For this reason, LiDAR gives an accurate snapshot of the ground elevation and its features.

ERDAS Imagine handles LiDAR in its native form (LAS). As a matter of fact, you can drag and drop a LAS file in the viewer to see and edit the point cloud.

LiDAR tools

It can render points clouds in 3D. In addition, you can view the intensity, classification, elevation and various returns.

The LiDAR profile side view is slick. You also get a front view which is also neat.

LiDAR profile sideview

As LiDAR expands in usage, ERDAS Imagine adjusts to its growing demand

Read More: Top 6 Free LiDAR Data Sources

3 Terrain Tools

Whether you have a photogrametric, LiDAR-based or inSAR digital elevation model, ERDAS Imagine can perform most types of terrain analysis.

The painted relief raster splits elevation into color ranges. It paints each range based on its elevation like in the example below. We’ve also included a side-view profile in this example.

DEM profile

ERDAS Imagine can generate your basic slope, aspect, contours and viewshed types of maps. Additionally, it has geoscientific tools to remove void areas, extract valleys and ridges and drape images in a virtual GIS viewer.

Aspect

You will need an additional license for stereo analyst. With stereo analyst you will be able to collect and measure 3D features using photogrammetric principles from stereo pairs of imagery.

ERDAS Imagine has a tool that slices your elevation data into a user-defined number of bins, each containing the same amount. It also has a tool to visualize the z-values (or reflectance spectrum) of a rectangular area such as the surface profile below:

Surface-Profile

Read more: Free Global DEM Data Sources – Digital Elevation Models

4 Spectral Tools




Every feature on Earth has its own unique composition. It reflects and absorbs red, green, blue, near-infrared and different types of energy. This means that each feature has its own spectral signature.

With this idea in mind, researchers are building spectral libraries cataloging the unique characteristics and compositions of minerals, vegetation and more. ERDAS Imagine lets you dig deeper in this subject with a spectral profile library of its own – similar to the USGS Spectral Characteristics Viewer.

Spectral Profile Viewer

With more spectral bands (such as with hyperspectral data), you have greater opportunity to classify more features with greater accuracy. Although hyperspectral data is hard to come by, ERDAS Imagine provides wizards for hyperspectral analysis.

Hyperspectral

There are tools for supervised and unsupervised classification. Despite its impressive image classification tools, you won’t be able to perform object-based image analysis like you can using Trimble ECogntion Definiens Developer.

Supervised Classification

There are no shortages of indices in remote sensing – NDVI, SAVI, GNDVI, RVI, MSAVI, DVI… Even for different materials like vegetation, sulfates, water, snow and ice.

As long as you have the needed bands, you can extract this data from your multispectral image. For example, here is a quick NDVI image:

WV2 False IR NDVI

5 Radar Tools

A whole other discipline in remote sensing is active sensors like synthetic aperture radar. For example, Sentinel-1, Radarsat and TerraSAR satellites can be imported in their native form.

Quickly view data by simply dragging the product.xml into your workspace

Radar Magnitude

ERDAS Imagine has the Radar Toolbox to satisfy the needs of synthetic aperture radar users. Despite of its complexity, ERDAS Imagine can perform interferometry for DEM extraction, texture analysis and polarimetric classification. Overall, this software makes it easy for the user to manipulate radar data

Radar

6 Spatial Model Editor

The Spatial Model Editor is where you string a set of tools together. When you run them all together, you can automate your work. Similar to ArcGIS Model Builder or a FME workbench, Spatial Model Editor lets you streamline and customize a repeatable way of getting the answer

For example, here is a LAS to raster conversion. In case you receive another LAS file, you can recycle your model and produce identical results with a different file.

Spatial Model Editor

The Spatial Model Editor is versatile and intuitive. Best of all, you can pick it up and learn effortlessly.

Although part of Hexagon Geospatial GeoMedia software, the Spatial Model Editor can manipulate and manage satellite and aerial imagery as well.

ERDAS Imagine History

Here are some of its key dates of release:

  • First, its initial release came in 1978 with ERDAS 4. In addition, it was ran on Cromemco microcomputers with options for large digitizing tablets and 80 megabyte hard drives.
  • Following its previous release, ERDAS 400 was introduced in 1980. At the time, computers were expensive and was being use by organizations such as NASA, US Forest Service, US Environmental Protection Agency.
  • In 1982, ERDAS 7 was launched which sparked a collaboration between ESRI ARC/INFO. Users were able to connect remote sensing with the power of GIS mapping.
  • Finally, The flagship ERDAS Imagine software product was introduced which it is still named today. Another key point is how the graphical user interface allowed users to visualize data, create maps and perform image processing.

Final Thoughts

ERDAS Imagine is one of the first remote sensing software programs.

…And it’s still one of the best.

This robust raster-based GIS suite provides a wide array of tools for geospatial analysis: import/export, map composition, image enhancement, image classification, raster GIS modeling and stereo analysis

What do you think of ERDAS Imagine? Let us know with a comment below.

3 Comments

  1. Well… I have to say the article is pretty good except you are wrong with the object based classification. The ERDAS IMAGINE Objective add-on is object based and has shown to be equal to eCognition. Give it a shot.

  2. Great article, but I have to agree with Mr. Joe Penor.
    ERDAS Imagine have the IMAGINE Objective Add-on module for object-based classification.

  3. The article is right.. unfortunately ERDAS still doesn’t let you perform an hierarchical OBIA, it means you can work with only one level of heterogeneity per time.. Anyways.. AM is a great software

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