Sentinel Overview

Leaf's service uses Sentinel-2 data which has the highest resolution publicly available and revisits each field every 3 to 5 days.

We generate a total of 24 images for each intersected field: A GeoTiff for each band from Sentinel and processed RGB, NDVI and NDRE images.

The following table shows all the images with its resolutions and types: (TIFs are EPSG:4326, PNGs are EPSG:3857).

NameResolutionTypeProjection
NDVI.pngNULLpng NDVIEPSG:3857
NDRE.pngNULLpng NDREEPSG:3857
RGB.pngNULLpng RGBEPSG:3857
NDVI.tif10tif raw NDVI valuesEPSG:4326
NDVI_color.tif10tif colored NDVIEPSG:4326
NDRE.tif10tif raw NDRE valuesEPSG:4326
NDRE_color.tif10tif colored NDREEPSG:4326
RGB.tif10tif RGBEPSG:4326
B01.tif60 meterssingle bandEPSG:4326
B02.tif10single bandEPSG:4326
B03.tif10single bandEPSG:4326
B04.tif10single bandEPSG:4326
B05.tif20single bandEPSG:4326
B06.tif20single bandEPSG:4326
B07.tif20single bandEPSG:4326
B08.tif10single bandEPSG:4326
B8A.tif20single bandEPSG:4326
B09.tif60single bandEPSG:4326
B11.tif20single bandEPSG:4326
B12.tif20single bandEPSG:4326
NDVI_relative.pngNULLpng relative NDVIEPSG:3857
NDVI_absolute.pngNULLpng absolute NDVIEPSG:3857
NDRE_relative.pngNULLpng relative NDREEPSG:3857
NDRE_absolute.pngNULLpng absolute NDREEPSG:3857

PNG files do not have resolution because they are scaled up by 800%.

We generate a colorized NDVI_color.tif and NDRE_color.tif using a custom-built color ramp. See the image below. If you prefer to use your own ramp, we recommend using NDVI.tif or NDRE.tif, which is a pre calculated index file. You can import it into any GIS software, like QGis, and use it as you please.

In addition, you will get the NDVI (i.e., we call them at Leaf as NDVI_relative.png, NDVI_absolute.png and NDVI.png) cut for your area of interest. The NDVI relative uses the minimum and maximum of the image of that date and, therefore, you would have a color scale to better visualize the differences of your harvest for that specific moment, whereas, the NDVI absolute and NDVI, whose range goes from -1 to 1, you can make comparisons on different dates, the difference between these files are the color ramp applied (i.e., in the NDVI all the values below 0 are bright red while in the NDVI absolute the color ramp begins at -1 as the bright red and the value 1 as the bright green inteporlated in between). Same for NDRE.

NDVI example: Left - NDVI relative, Center - NDVI absolute, Right - NDVI

Left - NDVI relative. Center - NDVI absolute. Right - NDVI.
We recommend using the Right one (just ndvi.png)

Clouds

We use the cloud mask provided by Sentinel-2 to calculate the clouds coverage percentage.

See the Satellite API Reference for more information.