ISLSCP II Global Primary Production Data Initiative Gridded NPP Data ############################################################################## File Name Convention -------------------- There are 2 *.zip files with this data set in 0.5 degree (hdeg) and 1.0 degree (1deg) spatial resolution: gppdi_npp_gridded_hdeg.zip and gppdi_npp_gridded_1deg.zip. There are five data files when the 2 *.zip files are extrapolated. gppdi_npp_gridded_hdeg.zip: contains the original file submitted by the investigators named gppdi_gridded_npp_hd.csv and is in tabular format. This file contains above ground and total Net Primary Production (NPP) for 2,335 half degree cells with associated ancillary information (See Section 8.2 for description). There are two files, gridded_anpp_map_hd.asc and gridded_totnpp_map_hd.asc, which contain the mapped above ground and total NPP, respectively. gppdi_npp_gridded_1deg.zip: contains gridded_anpp_map_1d.asc and gridded_totnpp_map_1d.asc, and these contain the mapped above ground and total NPP respectively, at 1.0 degree x 1.0 degree spatial resolution (the pixels were averaged from the half degree map files). ############################################################################## ASCII Table File Format ----------------------- All of the files in the ISLSCP Initiative II data collection are in the ArcGIS ASCII, or text format. The original data file "gppdi_gridded_npp_hd.csv" has a total of 2336 rows and 8 columns separated by a single comma. Both numerical and text fields are included. A value of -999 denotes a missing value. The contents for each column are given below: SEQ_#: ID number (1-2335) LAT_DD: Latitude for the center of a 0.5 degree cell in degrees LONG_DD: Longitude for the center of a 0.5 degree cell in degrees ANPP: Aboveground NPP in gCm-2yr-1 TOTNPP: Total NPP in gCm-2yr-1 LANDCOVER: Land cover type aggregated from a 1-km global land cover map (Hansen et al. 2002): 1 = Evergreen Needleleaf Forest 2 = Evergreen Broadleaf Forest 3 = Deciduous Needleleaf Forest 4 = Deciduous Broadleaf Forest 5 = Mixed Forest 6 = Woodland 7 = Wooded Grassland 8 = Closed Shrubland 9 = Open Shrubland 10 = Grassland 11 = Cropland ####################################################################### ASCII Map File Format --------------------- The map files were all created by the ISLSCP II Staff. The file format for the half degree mapped NPP files "gridded_anpp_map_hd.asc" and "gridded_totnpp_map_hd.asc" consists of numerical fields of varying length, which are delimited by a single space and arranged in columns and rows. The files each contain 720 columns by 360 rows. All values in these files are written as signed integer numbers. Water cells are assigned the value -99. Land cells with no data are given the value -88. The file format for the one degree mapped NPP files "gridded_anpp_map_1d.asc" and "gridded_totnpp_map_1d.asc" consists of numerical fields of varying length, which are delimited by a single space and arranged in columns and rows. The files each contain 360 columns by 180 rows. All values in these files are written as signed integer numbers. Water cells are assigned the value -99. Land cells with no data are given the value -88. These files are gridded to a common equal-angle lat/long grid, where the coordinates of the upper left corner of the files are located at 180 degrees W, 90 degrees N and the lower right corner coordinates are located at 180 degrees E, 90 degrees S. Data in the files are ordered from North to South and from West to East beginning at 180 degrees West and 90 degrees North. WARNING: The 1x1 degree product is for browse use only. These data files are averaged from the original 0.5 x 0.5 degree pixels. Thus the data values at specific pixels are not exact. Use this data with caution and always refer to the original tabular data files for specific information. ###############################################################################