The USGS Spectral Library Chapters.
| Constant | Value | Description |
|---|---|---|
| noChapter | 0 | No spectral chapter. |
| minerals | 1 | Minerals. |
| soils | 2 | Soils and Mixtures. |
| coatings | 3 | Coatings. |
| liquids | 4 | Liquids. |
| organics | 5 | Organic Compounds. |
| artificial | 6 | Artificial Materials. |
| vegetation | 7 | Vegetation. |