Near Real-time CLAVR-x Home Page

Near Real-Time Results from CLAVR-x

Within the NESDIS Office of Satellite Application and Research (STAR), we are running a parallel version of the CLAVR-x system that also runs in the NESDIS Office of Satellite Data Processing and Distribution (OSDPD). The goal of this effort is present diagnostic looks of the system performance and to test out new modifications. Note, this page is not meant to serve operational users.

VIEWING DATA

Recent CLAVR-x 1km Regional Results

Recent CLAVR-x Global Gridded 55 km Products

ACCESSING DATA

The following global gridded CLAVR-x output is available via ftp. This automated processing system was developed by Aleksandar Jelenak. The AVHRR GAC data is provided through a subscription from the NOAA Satellite Active Archive.

Global fields from multiple satellites within 90 minutes of 0, 6, 12 and 18Z for a given day.
Global fields for one satellite for a given day separated by ascending or descending node

Pixel level output is obtained through the ftp.ssec.wisc.edu/clavr/gac site and choosing the satellite name (n15,n17,and n18) and then choosing the type of pixel output

sst - sea surface temperature data (includes cloud mask and other flags)
nav - pixel level latitude and longitude
geo - pixel level sensor and solar angles
cld - pixel level cloud properties

Orbital gridded CLAVR-x output is available in the cell directories.

DATA ANALYSIS & VIEWING TOOLS

An IDL program has been written by Michael Pavolonis of UW/CIMSS to view the CLAVR-x HDF files. Grab the clavrx_idl_tools.tar file and untar the idl codes into a directory. The idl program that reads the CLAVR-x SDS's is called read_clavrx_hdf.pro. This idl routine works as follows. To extract the total cloud amount (sds name = frac_total_cld) from the file clavrx_n17_des_05_1_2004_197.cell.hdf into an array cloud_fraction,

cloud_fraction = read_clavrx_hdf('clavrx_n17_des_05_1_2004_197.cell.hdf', 'frac_cld_total')

The idl program map_clavrx.pro used read_clavrx_hdf.pro to produce global images from any clavr-x gridded file. This can run as follows within idl (using the same example)

map_clavrx, 'clavrx_n17_des_05_1_2004_197.cell.hdf', 'frac_cld_total', /jpg, /subflg

the optional /subflg keyword allows a subset of the globe to be imaged at a higher resolution

the optional /jpg keyword creates a jpeg image

The following is an image made using map_clavrx.pro

OTHER DATA TOOLS

A C code has been written by Michael Pavolonis of UW/CIMSS to convert the CLAVR-x HDF files into binary files (hdf2binary)

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CLAVR-x CLAVR-x Home		Near Real-Time Results from CLAVR-x Within the NESDIS Office of Satellite Application and Research (STAR), we are running a parallel version of the CLAVR-x system that also runs in the NESDIS Office of Satellite Data Processing and Distribution (OSDPD). The goal of this effort is present diagnostic looks of the system performance and to test out new modifications. Note, this page is not meant to serve operational users. VIEWING DATA Recent CLAVR-x 1km Regional Results Recent CLAVR-x Global Gridded 55 km Products ACCESSING DATA The following global gridded CLAVR-x output is available via ftp. This automated processing system was developed by Aleksandar Jelenak. The AVHRR GAC data is provided through a subscription from the NOAA Satellite Active Archive. Global fields from multiple satellites within 90 minutes of 0, 6, 12 and 18Z for a given day. Global fields for one satellite for a given day separated by ascending or descending node NOAA-15 NOAA-17 NOAA-18 Pixel level output is obtained through the ftp.ssec.wisc.edu/clavr/gac site and choosing the satellite name (n15,n17,and n18) and then choosing the type of pixel output sst - sea surface temperature data (includes cloud mask and other flags) nav - pixel level latitude and longitude geo - pixel level sensor and solar angles cld - pixel level cloud properties Orbital gridded CLAVR-x output is available in the cell directories. DATA ANALYSIS & VIEWING TOOLS An IDL program has been written by Michael Pavolonis of UW/CIMSS to view the CLAVR-x HDF files. Grab the clavrx_idl_tools.tar file and untar the idl codes into a directory. The idl program that reads the CLAVR-x SDS's is called read_clavrx_hdf.pro. This idl routine works as follows. To extract the total cloud amount (sds name = frac_total_cld) from the file clavrx_n17_des_05_1_2004_197.cell.hdf into an array cloud_fraction, cloud_fraction = read_clavrx_hdf('clavrx_n17_des_05_1_2004_197.cell.hdf', 'frac_cld_total') The idl program map_clavrx.pro used read_clavrx_hdf.pro to produce global images from any clavr-x gridded file. This can run as follows within idl (using the same example) map_clavrx, 'clavrx_n17_des_05_1_2004_197.cell.hdf', 'frac_cld_total', /jpg, /subflg the optional /subflg keyword allows a subset of the globe to be imaged at a higher resolution the optional /jpg keyword creates a jpeg image The following is an image made using map_clavrx.pro OTHER DATA TOOLS A C code has been written by Michael Pavolonis of UW/CIMSS to convert the CLAVR-x HDF files into binary files (hdf2binary) NESDIS/Satellite Applications and Research Home \| CIMSS Home \| SSEC Home