User Manual - pancroma

where:T = At-satellite brightness temperature (K)L λ = TOA spectral radiance (Watts/( m2 * srad * µm))K 1 = Band-specific thermal conversion constant from the metadata(K1_CONSTANT_BAND_x, where x is the band number, 10 or 11)K 2 = Band-specific thermal conversion constant from the metadata(K2_CONSTANT_BAND_x, where x is the band number, 10 or 11)To use the utility, open a Landsat TIR band by selecting ‘File’ | ‘Open’. Thenselect ‘PreProcess’ | ‘Compute Surface Temperatures’ | ‘Landsat 8’. (Only TIFFand L1G format is accepted by this utility.) A data entry screen will be displayed.You will be prompted to select how the data will be output. You can check boxesto direct PANCROMA TM to save a data file, display a grayscale image or displaya color contour plot. The band number track bar is visible but is not adjustable asthe temperature computation is only valid for band 6 input files. However theGraphics Image Scale Factor can be used to attenuate the grayscale imageoutput, since the temperature is reported in degrees Kelvin and will typicallyexceed the maximum allowable grayscale channel value (255) if not. The defaultsetting is 0.5. Note that you must check either the ‘Landsat 8 Band 10’ or‘Landsat 8 Band 11’ radio buttons as the band gain and offset are different for thetwo Landsat thermal bands.SPOT Top of Atmosphere ReflectancePANCROMA TM can also compute TOA Reflectance for SPOT band files. Theprocedure is nearly the same as for Landsat band files. Conversions must bemade one SPOT band file at a time. Open a band file by selecting ‘File’ | ‘Open’.Then select ‘PreProcess’ | ‘Compute Radiometric Corrections’ | ‘Compute SPOTTOA Reflectance’. The TOA Reflectance Data Form will become visible. Thisform will ask you to input the parameters that are needed to compute and render(if desired) the TOA data. The Solar Elevation Angle and Acquisition Date arerequired.Additional parameters include the SPOT band number and a graphics imagescale factor. In addition, the form has check boxes for writing the TOAreflectance data to file and for rendering it as an image. You must also inputthe appropriate Absolute Calibration Gain coefficient from the SPOT metadatafile. Unlike Landsat, these coefficients are not constant but vary somewhat fromscene to scene. The coefficient can be input using the SPOT AbsoluteCalibration Gain Track Bar on the TOA Reflectance Data Form.191