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What is NDRE imagery and how can I use it this season?

Normalized difference vegetation index (NDVI) vs Normalised difference red edge (NDRE) - farm software Australia - DecipherAg
Agriculture / Industry News

What is NDRE imagery and how can I use it this season?

 

Key points:

  • NDVI imagery is a great general indicator of crop health, however it isn’t perfect for all crop types or for all growth stages
  • NDRE imagery offers a more accurate solution which is able to detect variations in the health of cereal crops in their later stages, high biomass crops and permanent tree crops
  • Sign-up to Decipher Plus for just $99/month to check out our powerful NDRE imagery and create prescription maps for late season management applications

 

What is NDRE imagery?

Normalised Difference Red Edge (NDRE) imagery is a method of determining crop health by using the Red Edge part of the spectrum to detect changes in chlorophyll content within the leaf and through the plant canopy.

NDRE provides a more accurate solution for measuring biomass and variations in mid to late season, high biomass crops (including sugar cane), and permanent tree crops, compared to NDVI as it is able to identify variability where NDVI would often become saturated.

 

How is NDRE calculated?

NDRE differs from NDVI by using the Red Edge part of the spectrum instead of Near Infrared (NIR). The Red Edge sensors are able to detect changes in chlorophyll content within the leaf and through the plant canopy, making it more effective in later crop stages where NDVI tends to become saturated.

The Red Edge Biomass will appear more pixelated than the NDVI due to the Red Edge being 20m resolution, whereas the Near Infrared is 10m resolution.

Both layers are combined with the Red band, which is 10m resolution. The different layers are calculated using the following formulas:

NDVI  = NIR – Red

NIR + Red

 

NDRE = RE – Red

RE + Red

 

How can I use NDRE this season?

Using Decipher’s powerful NDRE imagery, you can gain better insight into permanent or later stage crops and improve your management applications throughout the season using management zones and prescription maps.

To check it out, simply sign-up to Decipher Plus ($99/month), and create a farm by drawing or uploading your farm and paddock boundaries as a KML or shape file.

Once the farm has been setup, you can then view both the NDVI and NDRE imagery clipped to your whole farm or a paddock, allowing you to easily identify variability and track trends throughout the season. You can then create management zones from NDRE for any late season management applications.

 

NDVI vs NDRE imagery

Find out the difference between NDVI and NDRE  and when to use each.

NDVI (Normalized Difference - DecipherAg Vegetation Index) vs NDRE (Normalized Difference Red Edge)


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