GeoSage enhances software to analyze Landsat-8 imagery

GeoSage’s software tool, Spectral Transformer for Landsat-8 Imagery, has been enhanced to include new functions towards automated image feature extraction.

The changes are built upon the existing tool, so with two button clicks, a user is able to rapidly perform image-band combinations, image stretching and image pan-sharpening, and produce colorful, detail-rich imagery composites at 30m and 15m resolutions.

New functions include:

• one-button click for automated NDVI calculation, with 3 types of outputs.
• one-button click for automated extraction of surface water areas, with 3 types of outputs.
• generic function to calculate 56 normalized difference image feature indices, with 3 types of outputs.
• generic function to calculate 56 band ratios, with 3 types of outputs.

The 3 types of outputs are automatically generated by the software. Each is a single-band GeoTIFF file, ready to be displayed in Windows Photo Viewer, GIS and remote sensing software, or Google Earth Pro.

• First output: 32-bit Float data type, useful for further analyses.
• Second output: 8-bit Byte data type, a unique colour palette is applied.
• Third output: 8-bit Byte data type, a binary image to show classified features after a user-defined threshold is applied.

This Landsat-8 image analysis software tool targets geospatial professionals, K-12 students, as well as the general public. It is very easy to use, productive and saves time. To test the new functions, a trial version is available. Updated software user guide and new application demos are also provided.