The ENVI Orthorectification Module Step-by-Step Workflow

ENVI is known for making scientifically advanced image processing and analysis capabilities accessible to all levels of geospatial imagery users by incorporating easy-to-use, automated processes and procedures. Now, the ENVI Orthorectification Module delivers orthorectification capabilities in an automated, wizard-based workflow, so you can perform advanced techniques, regardless of your experience with image processing or orthorectification.

And, since ENVI is integrated with ArcGIS, you can seamlessly output your results to a GIS without ever interrupting your workflow.

Select Input Imagery and DEM

The first step in the ENVI Orthorectification workflow is to load your imagery and digital elevation models by simply choosing files from the current available bands list.

• Include multiple data files, even from multiple sensors
• Restore a project file to work with previously saved results

Collect and Edit Ground Control Points

Once input data is defined, this optional step allows you to associate image pixels with points on the ground whose locations are known through geographic coordinate data.

• Manually enter ground control points or restore points from a previous session

• Evaluate errors between the ground control points and the model solution

• View the distribution of ground control points over the project area

Collect and Edit Tie Points

When multiple images are orthorectified and mosaicked, you may choose to establish tie points in areas of image overlap.

• Restore previously created tie point files

• Add new tie points

• Edit existing tie points

Reorder Images and Define Cutlines

Once tie points are collected, you can define the image extent and specify which areas between two or more overlapping images should appear in the final output.

• Define the hierarchy of each image relative to all others

• Define an optional cutline for the image by simply drawing a polygon or polyline on the image

Select Output Parameters

In the final step of the workflow, you will specify the output map projection, pixel size, filename and path.

• Perform automatic image-to-image color balancing

• Preview option will show you preliminary results before the entire result is processed