References | |
---|---|
official web page | https://climatedataguide.ucar.edu/climate-data/ndvi-normalized-difference-vegetation-index-3rd-generation-nasagfsc-gimms |
Climate Explorer URL | climexp.knmi.nl/select.cgi?ndvi |
Climate Explorer filename | UMDData/gimms_ndvi.nc |
Variable | |
name | ndvi |
units | 1 |
long_name | ndvi |
Netcdf global metadata | |
CDI | Climate Data Interface version 1.9.8 (mpimet.mpg.de/cdi) |
history | Mon Jun 08 11:13:17 2020: cdo -L copy ndvi/ndvi3g_geo_v1_1981_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1982_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1982_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1983_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1983_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1984_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1984_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1985_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1985_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1986_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1986_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1987_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1987_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1988_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1988_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1989_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1989_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1990_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1990_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1991_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1991_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1992_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1992_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1993_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1993_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1994_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1994_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1995_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1995_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1996_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1996_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1997_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1997_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1998_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1998_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1999_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_1999_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2000_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2000_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2001_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2001_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2002_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2002_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2003_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2003_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2004_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2004_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2005_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2005_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2006_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2006_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2007_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2007_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2008_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2008_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2009_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2009_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2010_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2010_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2011_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2011_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2012_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2012_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2013_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2013_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2014_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2014_0712_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2015_0106_lo_ndvi.nc ndvi/ndvi3g_geo_v1_2015_0712_lo_ndvi.nc gimms_ndvi.nc Sat Jun 06 20:38:31 2020: cdo -L monmean tmp_ndvi3g_geo_v1_1981_0712_lo_ndvi.nc ndvi3g_geo_v1_1981_0712_lo_ndvi.nc Sat Jun 6 20:38:31 2020: ncks -v ndvi ndvi3g_geo_v1_1981_0712_lo.nc tmp_ndvi3g_geo_v1_1981_0712_lo_ndvi.nc Sat Jun 06 20:15:15 2020: cdo -L -r -f nc4 -z zip remapcon,logrid.txt ndvi3g_geo_v1_1981_0712.nc4 ndvi3g_geo_v1_1981_0712_lo.nc Sat Jun 6 20:15:15 2020: ncatted -a units,time,a,c,months since 1980-12-06 -a units,lat,a,c,degrees_north -a units,lon,a,c,degrees_east ndvi3g_geo_v1_1981_0712.nc4 |
Conventions | CF-1.6 |
FileName | ndvi3g_geo_v1_1981_0712.nc4 |
Institution | NASA/GSFC GIMMS |
Data | NDVI3g version 1 |
Reference | 1. Pinzon, J.E.; Tucker, C.J. A Non-Stationary 1981-2012 AVHRR NDVI3g Time Series. Remote Sens. 2014, 6, 6929-6960. 2. Pinzon, J.E.; Tucker, C.J. A Non-Stationary 1981-2015 AVHRR NDVI3g.v1 Time Series: an update. Remote Sens. 2016, in preparation |
CommentsVersion1 | version1 includes two major fixes (a and b), and three minor (c-g): (a) Reprocessed Level 2 entire SeaWIFS mission for the land products to reduce artifacts in the data, particularly changes in calibration after 2006 that generates drops in ndvi lower values. OB.DAAC / Ocean Biology Processing group NASA/GSFC 616 (april 2016) (b) Recovered ndvi negative values of snow-covered regions in winter Northern latitudes. In Version0, we masked them with zero values, creating artifacts in phenology parameters. (c) Arranged data in ncd format, compiled it in two nc4 files a year. Each nc4 file includes 6 months of ndvi data (jan-jun and jul-dec), with a total of 12 (15-day) composites each semester. (d) Rescaled ndvi values and splitted the flag values from them. (e) Added a new variable, percentile, to represent the distribution of ndvi values in the time series. Range 10*[0, 100] (f) Flag values are (simpler): flag 0: ndvi without apparent issues (good value) flag 1: ndvi retrieved from spline interpolation flag 2: ndvi retrieved from seasonal profile (possible snow/cloud) (g) Flag values are embeded on the percentile variable: 2000*flag + percentile. Thus, the actual percentile three ranges [0 1000], [2000 3000] and [4000 5000] could provide direct information of how interpolation is affecting the time series. |
Temporalrange | 1981-07-01 -> 2015-12-31 |
Year | 1981. |
RangeSemester | Jul 1 - Dec 31 (7:0.5:12.5) |
SpatialResolution | 1/12 x 1/12 degrees |
TemporalResolution | 1/24 a year |
_fill_val | -32768. |
NorthernmostLatitude | 90 |
SouthernmostLatitude | -90 |
WesternmostLongitude | -180 |
EasternmostLongitude | 180 |
NCO = netCDF Operators version 4.7.9 (Homepage = nco.sf.net, Code | http://github.com/nco/nco) |
frequency | mon |
CDO | Climate Data Operators version 1.9.8 (mpimet.mpg.de/cdo) |
geospatial_lat_min | -62.85f |
geospatial_lat_max | 89.22f |
geospatial_lat_units | degrees_north |
geospatial_lon_min | -180.f |
geospatial_lon_max | 180.01f |
geospatial_lon_units | degrees_east |
geospatial_lat_resolution | 0.22f |
geospatial_lon_resolution | 0.22f |
time_coverage_start | 1981-07-15 |
time_coverage_end | 2015-12-15 |
climexp_url | climexp.knmi.nl/select.cgi?ndvi |