Vegetation

The current health state of plants can be observed with satellites globally and gives very useful information about the regional stress level of plants. This is interesting for environmental and agricultural purposes. meteoblue presently offers the following vegetation observation data:

  • Vegetation health (VHP)

VHP

Field Metadata
Title Vegetation health products
Short Title VHP
Version  
Theme NDVI, vegetation, vegetation health
Period of Time 1984 to present
Frequency Weekly
Update timelag < 2 months
Time-resolution weekly values (52 values per year)
Spatial Type Plate carrée grid (rectangular projection)
Spatial extend 180°E to 180°W / 55°S to 75°N
Spatial resolution 4 km, 0.05 degrees
Coordinate system WGS-84
Earth model WGS-84
Spatial reference system  
Publisher NOAA Climate Prediction Center
Date First Published 2012
Date Obsolete  
Description

The Vegetation Health Products (VH) of NOAA consist of gridded weekly global vegetation indices: temperature condition index, vegetation condition index, vegetation health index, Normalized Difference Vegetation Index (NDVI) and brightness temperature (BT). The data is derived from AVHRR GAC orbital satellites for the global area between latitude 55°S to 75°N. The spatial resolution is 0.036° (about 4 km at equator). Noise is minimized by applying the time series smoothing technique and other correction algorithms. The dataset is updated weekly. There is an archive of this dataset for almost every week since 1984.

The VH are indices, which range from 0 to 100 characterizing changes in vegetation conditions from extremely poor (0) to excellent (100). The VH values below 40 are used for identifying vegetation stress, which is an indirect drought indicator. The VH is very useful for early drought detection, assessing drought area coverage, duration, and intensity, and for monitoring drought impacts on vegetation and agricultural crops. The NDVI and BT were filtered in order to eliminate high frequency noise. They were also adjusted for a non-uniformity of the land surface due to climate and ecosystem differences using multi-year NDVI and BT data.

Detailed specification http://www.ospo.noaa.gov/Products/land/vhp/algo.html
Homepage URL http://www.ospo.noaa.gov/Products/land/vhp/
Security Classification public
Access Level https://www.usa.gov/government-works
License public

Current dataset issues:

Due to a change of satellite, NDVI values from March 2018 until present are significantly higher than historic values. NOAA is working on the problem and will make calibrated values available later in 2018.