Where can I download NDVI data?
USGS EROS Archive – Vegetation Monitoring – NOAA CDR NDVI
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- EarthExplorer offers daily records of NOAA CDR NDVI data on a 0.05 degree by 0.05 degree global grid.
- EarthExplorer can be used to search, preview, and download NOAA CDR NDVI data.
What is NDVI composite?
Normalized Difference Vegetation Index (NDVI) Composites are produced from multiple Advanced Very High Resolution Radiometer (AVHRR) daily observations that have been composited together to create a nearly cloud-free image showing maximum greenness.
Where can I find the electricity grid in Africa?
An interactive tool has been created for exploring this data, the Africa Electricity Grids Explorer. For MENA: Arab Union of Electricity and country utilities. There were many additional sources for specific countries and areas.
How to calculate the NDVI in raster data?
To calculate NDVI, you use the following formula where NIR is near infrared light and red represents red light. For your raster data, you will take the reflectance value in the red and near infrared bands to calculate the index.
What is the normalized difference vegetation index ( NDVI )?
The Normalized Difference Vegetation Index (NDVI) is a quantitative index of greenness ranging from 0-1, where 0 represents minimal or no greenness and 1 represents maximum greenness. NDVI is often used for a quantitate proxy measure of vegetation health, cover and phenology (life cycle stage) over large areas.
When did the AICD dataset come out for Africa?
This dataset serves as an updated and improved replacement for the Africa Infrastructure Country Diagnostic (AICD) data that was published in 2007. This dataset includes planned and existing grid lines for all continental African countries and Madagascar, as well as the Middle East region.