CLAVR-x Documentation

This page contains information of how to setup CLAVR-x and information describing the CLAVR-x output.

Installing and Running CLAVR-x
How to compile CLAVR-x
Setting up CLAVR-x Ancillary Data
How to Run CLAVRXORB - the CLAVR-x level 1b processor.
How to Run COMP_ASC_DES - convert orbital data into daily global files
How to Run COMP_TIME  - convert orbital data into global files


CLAVR-x Pixel-Level Output File Description
The following links links describe the CLAVR-x pixel-level outputs.  Each link shows a text file generated from the "hdp dumpsds -h" command and shows the variables and all of their attributes.  The philosophy of making multiple files is to allow people to minimize the amount of data they need to acquire for their application.

Cloud Product  (*.cld.hdf) : Cloud Properties including 2-bit cloud mask and cloud type
Cloud Mask Results (*.cmr.hdf):  2-bit cloud mask
Cloud Mask Test Results (*.cmt.hdf) : Results for each cloud mask test
Viewing geometry (*.geo.hdf): Sensor viewing geometry and solar viewing geometry angles.
Navigation files (*.nav.hdf): Latitude and longitude
Sea Surface Temperature files (*.sst.hdf): SST parameters including background SST, 2-bit cloud mask and surface type
Channel Observations files (*.obs.hdf): the reflectances and brightness temperatures  for each channel.


CLAVR-x Gridded Output File Description
CLAVR-x only makes one gridded output (*.cell.hdf).  Its contents are described here.  There are three types of gridded data (orbital, daily and synoptic).  The daily files are global fields that house data from a single satellite for either the ascending or descending node.  The synoptic files are global fields that house data from multiple satellites withina certain time interval around a specified time.  The orbital files are the gridded data produced from one orbit.  The orbital files only contian data in grid-cells observed within the orbit.  The following link lists the contents of an orbital grid-cell file.  The contents are the same in the daily and synoptic files.  

The gridded data from OSDPD is an equal-angle format witha resolution of 0.5 degrees. The data from AVHRR reprocessing project (PATMOS-x) is an equal-area format and it is described below.  The latitude and longitude for each cell are given for both formats.

Orbital grid-cell file (*.cell.hdf)
Format of Equal-Area Grids


Reading CLAVR-x Data
How to Scale / Unscale CLAVR-x data records.
Tools to Read CLAVR-x Data