Basics-5.4 Data sources: spectral libraries

[Preetee r. Nemdharry]

Hello

I’m Preetee from Mauritius. I do research on sugarcane using imagery. I’m looking for spectral library on vegetation, such as the NDVI values of sugarcane and weeds nad trees etc.

Kindly advise.

Thanks in advance

[Arlena Brosinsky]

Hi Preetee,
I’m not aware of a spectral library fically on sugarcane; however, a lot of vegetation spectra you can find in the ECOSTRESS spectral library (https://speclib.jpl.nasa.gov/). If you find a suitable library that is not included in the MOOC yet, we’d be happy if you could share it with your fellow students.
Actually, the NDVI can be calculated from multispectral imagery – you could most probably find Landsat (https://earthexplorer.usgs.gov/) or Sentinel-2 imagery (https://apps.sentinel-hub.com/eo-browser) over sugar cane fields and calculate the index yourself (?). If you would like to check out other vegetation indices, you can browse the vegetation index database (https://www.indexdatabase.de/db/i.php).
Maybe, our newest MOOC on imaging spectroscopy for agricultural applications is also of interest for you?
All of the above resources are for free, I hope you find something to support your work there.
All the best,
Arlena

[Priscilla Azevedo dos Santos]

All hyperspectral library data are freely available?

[Saskia]

Dear Priscilla,

thank you for your question.

Yes, in the course we present a number of freely accessible spectral libraries containing different surface materials. In some cases, such as the LUCAS SOIL library, a registration is required prior to downloading the data.

There are more and more freely accessible spectral libraries becoming available such as the very recently released Open Soil Spectral Library (https://explorer.soilspectroscopy.org/). Please let us and your fellow students know here in the forum if you find out about more libraries. We may include them in the next version of the course.

Best,

Saskia