readme.txt 4/12/04 DESCRIPTION: GLOBAL DISTRIBUTION OF FAO SOIL UNITS(TYPES) AT 1X1 RESOLUTION 106 SOIL TYPES and 27 SOIL TYPES AGGREGATED AT THE GREAT GROUP LEVEL CITATION: Zobler, L. 1999. Global Soil Types, 1-Degree Grid (Zobler). Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. COMMENTS: This data set includes a subset of Zobler's World Soil File for Global Climate Modelling (Zobler 1986). Soil types (units) are described at two levels of detail including 106 soil types and 27 soil types aggregated at the Great Group level. At the request of our user community we have included two additional formats (GRID ASCII and ARC/INFO EXPORT *.e00) of these data in addition to the original ASCII format (8/2003). For more information about Zobler's World Soil File for Global Climate Modelling, please see: (http://daac.ornl.gov/daacdata/global_soil/ZoblerSoil/comp/Zobler_NASA_TM_87802_1986.pdf) and (http://daac.ornl.gov/daacdata/global_soil/ZoblerSoil/comp/NASATM100685.pdf) The complete data set (which includes soil units [27], soil units [107], soil surface texture, surface slope, and other phase information) is available as a part of: Staub and Rosenzweig's GISS Soil and Surface Slope, 1-Degree from: http://www.dss.ucar.edu/datasets/ds770.0. A modified version of these data is also available as: Staub and Rosenzweig - Zobler Soil Type, Soil Texture, Surface Slope, and Other Properties' from: http://www.ngdc.noaa.gov/seg/eco/cdroms/gedii_a/datasets/a11/sr.htm. ------------------------------------------------------------------------- FILES: COMPANION FILES IN /comp: readme.txt - this file readme2.txt - a listing/key of the FAO/UNESCO continent codes referenced in and the Zobler soil types (27 and 106) referenced in this data. README_images - note reminding ftp users to download all graphics and companion files soil1x1.help - original documentation, use with soil1x1.fao zobler1x1.gif - graphic ------------------------------------------------------------------------- DATA FILES IN /data: 1. cont_code.asc - GRID ASCII file containing FAO continent codes (2-10); please see readme2.txt in the /comp directory for the continent code key. These values correspond to the volume numbers of the nine major continental divisions in the FAO/UNESCO Soil Map of the World Vols. 2-10 (1971-1981). 2. cont_code.e00 - same as above in ESRI export file format. 3. zstype106.asc - GRID ASCII file containing Zobler soil types (106); please see readme2.txt in the /comp directory for the soil type key. These values correspond to the sequence number of the soil types in Zobler's (1986) World Soil Data File. 4. zstype106.e00 - same as above in ESRI export file format. 5. soil1x1.fao - original data file, includes 27 soil types aggregated at the great group level in an ascii array. Please see soil1x1.help for formatting information. Please see readme2.txt in the /comp directory for the soil type key. 6. zstype27.asc - soil1x1.fao (includes 27 soil types) reformatted into GRID ASCII format. Please see readme2.txt in the /comp directory for the soil type key. 7. zstype27.e00 - soil1x1.fao (includes 27 soil types) reformatted into ESRI export file format. Please see readme2.txt in the /comp directory for the soil type key. ------------------------------------------------------------------------- GIS FORMATS: 1. GRID ASCII - a single ASCII array with integer values. (Coordinates listed below are in decimal degrees.) The ASCII file consists of header information containing a set of keywords, followed by cell values in row-major order. The file format is {NODATA_VALUE xxx} row 1 row 2 . . . row n where xxx is a number, and the keyword NODATA_VALUE is optional and defaults to -9999. Row 1 of the data is at the top of the grid, row 2 is just under row 1 and so on. The end of each row of data from the grid is terminated with a carriage return in the file. First six lines of file (header): ncols 360 nrows 180 xllcorner -180 yllcorner -90 cellsize 1 NODATA_value -9999 To import this file into ArcInfo use the following command at an ARC prompt: ASCIIGRID {INT | FLOAT} Arguments - the ASCII file to be converted. - the user specified name of the grid to be created. {INT | FLOAT} - the data type of the output grid. INT - an integer grid will be created. FLOAT - a floating-point grid will be created. Note: This data can also be imported into ArcView (with Spatial Analyst) and ArcGis as ASCII Raster data. 2. EXPORT FILE - this data can be imported into ARC/INFO GRID using the following command at an ARC prompt: IMPORT