# Services

## Crop Health Indexes

Crop health indexes provide information of plant physical structure and plant cover.

`NDVI`

Indicator of vegetation greenness and growth. using the following formula`(B08 - B04) / (B04 + B08)`

`NIRV`

Reflects the productivity and yield of the crops as closely as possible. using the following formula`((B08 - B04) / (B08 + B04)) * B08`

`NDWI`

Indicator of water stress and irrigation practices. using the following formula`(B11 - B08) / (B11 + B08)`

`EVI`

Similar to SAVI, tries to reduce noise in NDVI and resolves saturation issues at high LAI, closer related to plant productivity (gross primary production GPP). How advantageous depends on the crop type. using the following formula`2.5 * (B08 - B04) / ((B08 + 6.0 * B04 - 7.5 * B02) + 1.0)`

`CHI`

Chlorophyll content Index, ideal for monitoring biotic stress, yield estimation and Nitrogen requirements. using the following formula`(B08 / B05) - 1.0`

`NDRE`

Normalized Difference Red Edge Index for NITROGEN stress monitoring. using the following formula`(B08- B05) / (B08 + B05)`

`LAI`

Commonly measured in fields, used in crop models to predict yield. using the following formula`10.22 *( (B08 - 0.460 * B08)*0.0001) + 0.4768`

`SAVI`

Essentially, NDVI corrected for noise coming from soil. using the following formula`(B08 - B04) / (B08 + B04 + L) * (1.0 + L)`

, where`L=0.428`

`RGB`

True color image, used as visual check on customer side for any odd patterns in the indexes.