Which tool are you trying to use? To convert the Radiance bands of a MOD021 dataset to brightness temperature and emissivity, you can use the Emissivity Normalization or Emissivity Reference Channel tools. ENVI will usually open MODIS data with the scale factors applied to the dataset so that they are in the expected units of W/m2/μm/sr. You may need to assign wavelengths to the bands of the file (I show 22 bands in my radiance dataset). Since there are multiple datasets contained within the HDF file, could you have selected the reflectance or emissivity bands by accident for input to one of these tools?

I use ENVI 5.0. I found this tools in programm and click there. However, nothing happens. The modis-file includes radiance, reflectance and emissive. I download radiance in data manager. Then i choose cursor value tool, but i cant understand which data ara showed in window?

MODIS support was not very good in ENVI 5.0 (new interface). You could try it in ENVI Classic or upgrade to a newer version. That might be the issue.

Yes. ENVI in classic mode can calculate emissivity. What values must be in window "Calculate emittance parameters"? For example, data scale factor, wavelength scale factor and so on... What's file must be download in programm (radiance, emissive or reflectance)?

These parameters are described in the documentation: http://www.exelisvis.com/docs/Atmosph... (near bottom of document under Convert to Emissivity and Temperature) You will input the Radiance data for correction. MODIS is auto-corrected on open to be in W/m2/μm/sr. Wavelength units should already be in μm. You may need to assign wavelengths to your dataset since not all MODIS data opens with wavelengths applied. You can do this using Edit ENVI Header. Think most of the parameters can be left at default.

I used emissivity normalization tool for file with radiance. As a result i got two files. The first one is emittance temperature and the second one is emittance. I opened the emittance temperature file and used cursor value tool. It show: Loc: 509.0000,99.0000 MOD021KM.A2015119.0325.006.2015119135149.hdf File: 509,99 Data: [0.074862,0.102096,0.058862] I can't understand which value shows the brightness temperature?

Those look like Emissivity image. Did you toggle on Output Temperature Image? This image will be in Kelvin with values around 275-300.

I tried to open two files which were obtained after using the emissivity normalization tool. I think that values of temperature must be smaller too.

If the input image was in the expected units of W/m^2*sr*um, then I would expect the tool to return emissivity around 0.9 or so and temperatures around 260-300 kelvin. If your values are significantly different, then I would suspect the image is not in the expected units. Are you opening the image as File->Open As->EOS->MODIS? If you open as generic HDF, then the scale factors are not automatically applied to the data and the values displayed are integers. If you open as MODIS, then the values should be floating point.

I tried to opening file as MODIS and as generic HDF. But in window "Enter MODIS filenames" i can't see these files.

Do the files have an .hdf extension? Sometimes they do not use this extension but the files are still in HDF format. ENVI is filtering files based on an extension of .hdf but in the file selection dialog, you can change the filter type from *.hdf to *.* so you can see all files in the directory. How did you open the file previously? If you open it as generic HDF, then you will need to manually apply the scale factors to convert the data to floating point radiance.

These files haven't extension. What I should do?