User's Guide

CHIPSETUP

Chip setup procedure

Function:

The chip setup procedure retrieves information related to the specified AVHRR LAS image. This information includes the band to process and the area to process within the Digital Chart of the World (DCW). This information is used by the AUTONAV procedure to create chips for use in automatic navigation of an AVHRR image.

Parameters:

IN
Input image. The AVHRR LAS image the information is to be retrieved for. The image must have an associated ADDR file. Windowing and subbanding are not allowed.

BAND
Band number. Band number from the image to process. Band two is processed for daytime passes and band four is processed for nighttime passes. The band number is returned in this integer TAE parameter.

AREA
Digital Chart of the World area. The area of the DCW that the pass is over. The following is a list of areas in the DCW that may be returned in this string TAE parameter:


   = SOAMAFR:  South America/Africa
   = EURNASIA: Europe/North Asia
   = SASAUS:   South Asia/Australia
   = NOAMER:   North America

Examples:

  1. LAS> chipsetup in=al11050192113703 band=band area=area

    The band to process and DCW area are calculated using the information in the associated ADDR file al11050192113703;addr and returned in the TAE name parameters.

Description/Algorithm:

CHIPSETUP creates the name of the AVHRR Data Descriptor Record (ADDR) file. It extracts information from the ADDR which will be used for chip creation and correlation. CHIPSETUP determines the appropriate DCW library to use based on the location of the image and returns it in the AREA parameter. The area is used when the -DCW option is used in AUTONAV for creation of DCW chips. Also, the band is selected to specify which should be used in chip correlation. Band two will be selected for day scenes and band four will be selected for night scenes.

Nonfatal error messages:

    None.

Fatal Error Messages:

  1. [chipsetup-fatal] Fatal error encountered

    The error message displayed immediately preceding this message is the specific error encountered. Processing is terminated.

  2. [chipsetup-qout] Error sending variable block to TAE

    An error was encountered sending the variable block to TAE. If the error persists, contact the system administrator.

  3. [chipsetup-send] Error sending <xxxxx> to TAE

    An error occurred sending the specified parameter to TAE. If the error persists, contact the system administrator.

User Notes:

  1. The information calculated by CHIPSETUP is used by the AUTONAV procedure to create image chips used in automatic AVHRR image navigation.

  2. AVHRR Band two is processed for daytime passes and band four is processed for nighttime passes.

  3. Related functions are AUTONAV, DCWCHIPS, and CORRELATE.