APIs

Environmental IndicesAPI Reference

Under Development

Trigger high-performance spatial band algebra calculations on satellite tiles, returning statistical metrics and computed raster grids.

Index Calculation Engine

The index endpoints process raw band values (Reflectance) to generate indices indicating crop health, moisture, soil characteristics, or burn severity.

POST/v1/indices/compute

Compute a specified environmental index on a designated satellite tile. Calculations run on GPU clusters and return geo-referenced GeoTIFF assets.

Request Parameters

Parameter	Type	Required	Description
tile_id	string	YES	The unique ID of the satellite raster tile (returned by the /imagery search endpoints).
index	string	YES	The short abbreviation of the environmental index to calculate. Supported indices: 'NDVI', 'EVI', 'SAVI', 'NDWI', 'NBR2', 'NBSI', 'NDI7', 'VIIRS'.
resolution	string	NO	Target spatial resolution size (e.g. '10m', '20m', '60m'). Default matches original band resolution.

json

1	{
2	"status": "success",
3	"tile_id": "s2_tile_20260515_t10t",
4	"index": "NDVI",
5	"statistics": {
6	"min": -0.12,
7	"max": 0.89,
8	"mean": 0.54,
9	"std_dev": 0.18
10	},
11	"asset_url": "https://download.velstrom.in/computed/ndvi/s2_tile_20260515_t10t_ndvi.tif"
12	}

Supported Indices & Formula Specs

Index	Description	Key Bands Required
NDVI	Normalized Difference Vegetation Index (Vegetation density)	NIR (B08), Red (B04)
EVI	Enhanced Vegetation Index (High-sensitivity agriculture)	NIR, Red, Blue (B02)
SAVI	Soil Adjusted Vegetation Index (Arid/sparse vegetation regions)	NIR, Red, Soil Correction (L)
NDWI	Normalized Difference Water Index (Liquid water thickness)	NIR (B08), SWIR (B11)
NBR2	Normalized Burn Ratio 2 (Burn severity/slash post-fire)	SWIR1 (B11), SWIR2 (B12)
NBSI	Normalized Burn Soil Index (Arid soil post-fire analysis)	SWIR, NIR, Red
NDI7	Normalized Difference Index 7 (Geology / clay minerals)	SWIR2 (B12), Red (B04)
VIIRS	Visible Infrared Imaging Radiometer Suite (Nightlight/Thermal)	DNB (Day/Night Band)