When to classify soils from a Landsat 7 scene... Bare soil indices like BI (bare soil index) or NDSI (soil index)... Whats the difference between these two? Or any indices similar to these?
There are different soil indices needed to remotely distinguish areas that are truly bare, from urban surfaces, agricultural practices, areas with varying density of plant recovery. Not all surface soils have same color, presence or lack of organics, period since disturbsnce whether land clearing, wildfire, exposure due to infertile or dry soils. You may want to try both, then go to field and check where they agree (overlap polygons), and where one identifies a coverage thst the other identifies as something else. Knowing these specifics may help you choose one over the other, or maybe decide you want both for increases clarity of some land uses. If you are limited in field identification time, perhaps cross referencing with recent aerial photos may help you decide which best applies to your area.
https://www.researchgate.net/publication/285574324_Assessing_spatio-temporal_health_of_forest_cover_using_forest_canopy_density_model_and_forest_fragmentation_approach_in_Sundarban_reserve_forest_India
Article Assessing spatio-temporal health of forest cover using fores...
The Bare Soil Index (BSI) is primarily for bare land extraction from satellite data. The index is prepared for analyzing bare soils, as bare-soil plays an important role by being the reason of dust storms in most arid regions.
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