What is the data format of your AVHRR data? Is it in one of the supported formats listed under File ->Open External File->AVHRR? Do you get an error message opening your file and if so, what does it say?

Marim, Thank you for reply. The data fomat in 1 folder including - cksum_20041207092512 - us89_011017.ddr - us89_011017.img - us89_011017.log When I open image file with File>> Open image file then It ask for edit header file first. The .txt file in AVHRR composite doesn't have much data to input. The detail of .txt file is as following; 011017 us 101 ah11011289200050 011017 us 102 ah11011489175910 011017 us 103 ah11011589211210 011017 us 104 ah11011689192000 ---- When I open with File>> Open external file>> AVHRR>> KLMN/ level 1b, then it show error message as below AVHRR file: us89_011017.img Problem: An error was encountered reading this file. Error: Array dimensions must be greater than 0 ---- When I open with File>> Open external file>> AVHRR>> SHARP, then it show error message as below AVHRR file: us89_011017.img Problem: This file doesn't appear to be a vilid SHARP file. Unable to open file. ---- When I open with File>> Open external file>> AVHRR>> Quorum, then it show error message as below AVHRR file: us89_011017.img Problem: An error was encountered reading this file. Error: Array dimensions must be greater than 0. ---- Looking forward for your suggestion. Thanks Paula

Try opening the file as ERDAS Imagine format (under File ->Open External File ->IP Format). If that is not the format, then you might contact the data provider to ask what format the data files are in.