File: get_srbavg1_1deg_reg_monthly.README
1.0 Introduction
This readme file document provides information on how to extract
the 1-degree regional monthly average top of the atmosphere (TOA)
fluxes from the Clouds and Earth's Radiant Energy System
(CERES) SRBAVG1 HDF data sets. The entire CERES SRBAVG1 data set
contain 314 HDF Science Data Sets (SDS). The 1-degree regional
monthly average TOA geo and non-geo fluxes are contained in 20 of
these 314 SDS. The CERES SRBAVG1 data set is part of the larger CERES
SRBAVG data set, which also contain SRBAVG2 and SRBAVG3 data sets.
Additional information on the CERES SRBAVG data set can be found at
http://eosweb.larc.nasa.gov/GUIDE/dataset_documents/cer_srbavg.html
This document includes the following sections:
Section 2.0 - Script read package contents
Section 3.0 - Description
Section 4.0 - Script usage
Section 5.0 - Advantage of using this script
Section 6.0 - Flat binary file format
Section 7.0 - GrADS control file
Section 8.0 - Examples global gifs images from GrADS
Section 9.0 - FORTRAN/C read programs
Section 10.0 - CERES 1-degree equal-angle grid system
If users have questions, please contact the Langley ASDC User and Data
Services Office at:
Atmospheric Science Data Center
User and Data Services Office
Mail Stop 157D
NASA Langley Research Center
Hampton, Virginia 23681-2199
U.S.A.
E-mail: support-asdc@earthdata.nasa.gov
Phone: (757)864-8656
FAX: (757)864-8807
URL: http://eosweb.larc.nasa.gov
2.0 Sample Read Package Contents
This package consists of the following files:
1) get_srbavg1_1deg_reg_monthly_geo*
2) get_srbavg1_1deg_reg_monthly_nongeo*
3) read_srbavg1_1deg_reg_monthly.c
4) read_srbavg1_1deg_reg_monthly.f
5) srbavg1_nongeo_clw.gif
6) srbavg1_nongeo_cnet.gif
7) srbavg1_nongeo_csw.gif
8) srbavg1_nongeo_tlw.gif
9) srbavg1_nongeo_tnet.gif
10) srbavg1_nongeo_tsw.gif
11) tnongeo.ctl
3.0 Description
"get_srbavg1_1deg_reg_monthly_geo" and
"get_srbavg1_1deg_reg_monthly_nongeo" are csh scripts that use
standard HDF4 "hdp" utility and standard Unix "split" and "cat"
commands to extract global map of CERES SRBAVG1 1-degree regional
monthly average top of the atmosphere (TOA) geo and non-geo
fluxes from the standard CERES SRBAVG1 HDF data file. The output
is a flat binary file (IEEE 32-bit unformated binary data with
no header) that contains
geo output parameters from "get_srbavg1_1deg_reg_monthly_geo":
1) global map of geo TOA total sky outgoing longwave flux
2) global map of geo TOA total sky reflected shortwave flux
3) global map of geo TOA total sky net downward flux
4) global map of geo TOA total sky shortwave albedo
5) global map of geo TOA total sky outgoing window flux
6) global map of geo TOA clear sky outgoing longwave flux
7) global map of geo TOA clear sky reflected shortwave flux
8) global map of geo TOA clear sky net downward flux
9) global map of geo TOA clear sky shortwave albedo
10) global map of geo TOA clear sky outgoing window flux
non-geo output parameters from "get_srbavg1_1deg_reg_monthly_nongeo":
1) global map of non-geo TOA total sky outgoing longwave flux
2) global map of non-geo TOA total sky reflected shortwave flux
3) global map of non-geo TOA total sky net downward flux
4) global map of non-geo TOA total sky shortwave albedo
5) global map of non-geo TOA total sky outgoing window flux
6) global map of non-geo TOA clear sky outgoing longwave flux
7) global map of non-geo TOA clear sky reflected shortwave flux
8) global map of non-geo TOA clear sky net downward flux
9) global map of non-geo TOA clear sky shortwave albedo
10) global map of non-geo TOA clear sky outgoing window flux
The albedo is unitless and is in fraction. The fluxes are real number
and is in unit of watts per squared meter. A value of 3.40282e+38
represents missing or no data for the gridbox.
This flat binary file can be display using GrADS software with the
supplied GrADS control file. A fortran read program is also provided
to read the flat binary file. The pre-build binary of the HDF4 "hdp"
utility can be obtained through the HDF4 website at
http://hdf.ncsa.uiuc.edu/release4/obtain.html
4.0 Script usage
geo:
To use the script, just type the following at the Unix command line
> get_srbavg1_1deg_reg_monthly_geo