- Data visualization: line, surface and contour plots; displaying imagery
- Reading/writing data files, including HDF, HDF5, HDF-EOS, NetCDF, Shape, DICOM, JPEG2000, XML, as well as plain text and binary
- Array operations
- Using iTools
- Analysis: gridding and interpolation, curve fitting, signal and image processing
- Working with map projections
- User interface programming
- Cross-platform development
- Programming with Object Graphics
- Object-oriented programming
- Code tuning and performance
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- Multispectral remote sensing basic to advanced
- Hyperspectral remote sensing
- Optical data preprocessing and The FLAASH Atmospheric Correction Module
- Custom Classes Only: Topographic Analysis with ENVI and The DEM Extraction Module
- Custom Classes Only: ENVI for GIS: The Spatial Feature Extraction Module
- The ENVI NITF Module
- LIDAR remote sensing and data analysis
- RADAR remote sensing
- Adding custom functionality to ENVI - Extending ENVI with IDL
- Application specific content: military/intelligence, vegetation science, exploration geology, maritime environments
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