Hi Yuhendra, If wavelengths are not defined in the input image header file, FLAASH prompts you to read these values from an ASCII file using ENVI's Input ASCII File dialog. So the error message you getting is quite helpful. The ASCII file should contain data in columns (for example, the wavelengths are in one column). Be sure to correctly specify the wavelength column and units when reading the ASCII file. The FLAASH module does require a fair amount of upper level information in order to carry out its duties. I would strongly suggest that you review the FLAASH documentation that comes with your version of ENVI. You will need to become familiar with the terminology and concepts if you are to understand your results correctly. There are many helpful entries here in the forum that address the type of problems and questions you will encounter. One hint I can offer is to know as much about your data as possible. This would include wavelength values, what type of MODIS data you have as there are many. You should also familiarize yourself with terms such as wavelength, FWHM, reflectance versus radiance, scale factors and so on. These are but a smattering of what you will encounter. If you don't understand these terms it will be difficult for you to understand any replies you may get on the forum should you ask any questions in the future. Ciao  

Thank you friend. But i have some question 1. where i can find "ENVI input ascii file dialog in ENVI Menu ? 2. what is modis raw data (Aqua & terra) including header file to read data Thank you

Hi yuhendra, The answer to question 1 is you won't find it in the ENVI menu, but you will find it available in FLAASH. I don't know what version of ENVI you have but if you read the Help documentation for FLAASH you will see that dialog mentioned in step 2 of "Specifying Input and Output File Information". There are also tutorials available from the ITT VIS website that show you how to use FLAASH. 2) You can find out more about MODIS data here: http://modis.gsfc.nasa.gov/about/ If that is not what you need then you need to be more specific about what you are trying to do. Remember that If you are not sure you can always first try looking in the ENVI Help for things related to what you want to do with you imagery in ENVI or FLAASH. If you want to know more about your what your data is you can also use the internet to search for it there. Ciao

Create image How to create image using envi without the display envi logo in the left side after we are processing image thanks

Is this after processing in FLAASH? What version of ENVI are you using?

[QUOTE]yuhendra wrote Hi Everybody I have Aster DATA, Consist of 3 channel : VNIR resolution = 15 m , SWIR = 30 m and TIR = 90. How to cropping process using ENVI for 3 channel ? I want to fusion processing using ASTER data. Thank you