California Applications Program / California Climate Change Center

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Scenarios -- Downscaled Data in ArcGIS Format


Beta format -- please let Mary know if you have any problems with the files

Several researchers have requested the downscaled data in ArcGIS format. Working closely with Kirk Klausmeyer (The Nature Conservancy) as a beta-user, programs and scripts have been developed to offer some of the monthly downscaled data in a format that can easily be opened in ArcGIS. If you have any questions and/or problems with these data files please contact Mary (mtyree@ucsd.edu; 858-822-1625).
The BCSD data cover 31.9375N to 43.9375N and 124.5625W to 113.0625W. The VIC grid is a 1/8th degree grid so this makes a "box" of 93 longitudes by 97 latitudes. The VIC computations are done over land only. For the 93x97 box there would be a total of 9021 points and 2096 of these would be missing (not land). These missings are provided as -9999 in the ArcGIS files.

Since the ArcGIS format is most familiar with integer numbers, the data from the downscaling is multiplied by 10000.

Be sure to divide by 10000 to have numbers that "make sense"

The header for the BCSD files will have the format:

ncols 93
nrows 97
xllcenter -124.5625
yllcenter 31.9375
cellsize 0.1250
nodata_value -9999

Files have been made for monthly data. The files end with the suffix '.asc'. These files should import into ArcGIS easily (to be converted to grids). Because the files are monthly, please look for a tar directory called 'files4arc' under the monthly data space for a scenario/model. For example, you would look in downscaled/bcsd/sresa2/monthly/gfdlcm21/files4arc. gzipped tar files are provided. Once you unzip and untar these files, you will have a grid for each month of the simulation period (1950-2099). The individual files will repeat the month, year, model, scenario and downscaling information.

Files are available for variables from the flux files -- these have 'flx' in the filename. Files are also available for variables from the input files -- these have 'inf' in the filename.

These monthly files are made from daily data. The variables precipitation, evaporation, runoff and baseflow are monthly sums. All other variables are monthly means.

The following variables are available:


Below is a table that shows which models/scenarios have the 'files4arc' available.

MODEL
SRESA2
SRESB1
analog
bcsd
analog
bcsd
cnrmcm3
arc tbc
arc ok
arc tbc
arc ok
gfdlcm21
arc tbc
arc ok
arc tbc
arc ok
miroc32med
not avail
arc tbc
not avail
arc tbc
mpiecham5
not avail
arc tbc
not avail
arc tbc
ncarccsm3
not avail
arc ok
not avail
arc ok
ncarpcm1
arc tbc
arc ok
arc tbc
arc ok

ok ==> gzipped tar files are available
tbc ==> gzipped tar files are 'to be completed'


Please contact Mary Tyree with any questions:
mtyree@ucsd.edu
(858)822-1625