Independent Variables (Grids)

Other Info

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, reating 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.

Data

NDVI3g version 1

EasternmostLongitude

180

Institution

NASA/GSFC GIMMS

NCO

4.3.7

NorthernmostLatitude

90

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

SouthernmostLatitude

-90

SpatialResolution

1/12 x 1/12 degrees

TemporalResolution

1/24 a year

WesternmostLongitude

-180

Last updated: Thu, 09 May 2019 19:14:16 GMT