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| Software | Best for | Price | ENVI Skill Transfer | | :--- | :--- | :--- | :--- | | | Landsat/Sentinel-2 classification | Free | Moderate – different GUI | | Google Earth Engine (GEE) | Large-scale time series analysis | Free (cloud-based) | Low – requires JavaScript/Python | | SNAP (ESA) | Sentinel-1 (radar) & Sentinel-2 | Free | High – similar raster tools | | ENVI Student Edition | Learning & coursework | $150/year | Very high – identical workflows | envi 5.6.3 download