Change detection is one of the most common uses of remotely sensed data. IMAGINE DeltaCue, a new add-on for ERDAS IMAGINE® simplifies the complexity of the change detection process, rapidly moving users from image to information to results. Change detection is used to highlight or identify significant differences in imagery acquired at different times; playing an important role in the lifecycle of GIS features and providing the capability to update feature data based on new imagery.




An adaptable suite of processing procedures
This new add-on software uses project-based workflows to manage preprocessing, change detection, change filtering and change results viewing and interpretation. Wizard workflows assists users with initial inputs and selection of preprocessing and processing steps to target changes of interest. Types of change not of interest to the user can be quickly filtered out. Project files established by the wizard manage the resulting ancillary files generated, document procedures that have been run, allowing the user to return to a project and pick up where they left off.

Key application areas include:
• Detecting changes in land use & land cover
• Delineating wetlands loss and encroachment
• Estimating forest loss through development or disease
• Identifying new housing and infrastructure changes
• Mapping flood extent areas and disaster impact zones

Key Features include:

Change Algorithms
§ Customize processing for different applications

Change Filters
§ Filter change results based on specific spatial and spectral characteristics

Change Thresholding

§ Provides user with a more intuitive and dynamic way to set critical change thresholds

§ Automatic % change threshold allows for rapid, repeatable automatic processing

Automatic Preprocessing

§ Automatically crops analysis down to just the area in common to the image pair

§ Performs image to image radiometric normalization with accommodation for the effect of clouds and cloud shadow

Customized Change Viewer

§ Geo-linked windows that pan and zoom together with automatic synchronization

§ Overlay of change results on top of original imagery

§ Change magnifier that allows for rapid investigation of before and after areas

§ Flicker and swipe tools available off the toolbar

§ Contrast and Brightness enhancements easily applied to all layers

§ Interactive spectral segmentation tool allows for removal of spectral classes not of interest across entire image

§ Access to ERDAS IMAGINE’s AOI, annotation and vector tools for output development

§ Rapid export of change detection results to ESRI shapefile format

Settings Files

§ Process settings can be saved for automatic use by less experienced users on similar image pairs

Site Monitoring Viewer

§ Customized display for the interpretation and monitoring of subtle changes of specific sites

§ Multitemporal display of individual bands as well as Tasseled Cap components

§ Blend tool

§ Provides misregistration filter to minimize the effect of false alarms due to poorly co-registered image pairs