User Manual - pancroma

Where QCAL are the calibrated image DNs, and Grescale and Brescale are thesensor gain and offset, respectively.Open a band file by selecting ‘File’ | ‘Open’. (PANCROMA TM can input LandsatTIFF and L1G format files) Then select ‘PreProcess’ | ‘Compute RadiometricCorrections’ | ‘Compute Landsat 7 TOA Radiance’. The TOA Radiance DataForm will become visible. This form will ask you to input certain parameters thatare needed to compute and render (if desired) the TOA data. The SolarElevation Angle and Acquisition Date are not required. A scale factor can beinput to scale the image rendering. Additional parameters include the Landsatband number (this is needed because the sensor gain and offset values are notthe same for all Landsat bands). As for TOA reflectance, the form has checkboxes for writing the TOA reflectance data to file and for rendering it as animage.Landsat 7 Approximate Surface ReflectancePANCROMA TM now has the ability to conduct haze reduction and then TOAreflectance computations with a single menu selection. Currently Landsat,SPOT, ASTER and EO-1 ALI are supported. The method pairs the Dark Areahaze reduction algorithm with the TOA reflectance calculations specified by theData Handbooks for each sensor platform. (I will probably add at least someHOT capability in the future.)The utility currently handle a single band file at a time. To use it, first open yourinput band file by selecting ‘File’ | ‘Open’ as usual. The select ‘Preprocess’ |‘Compute Radiometric Corrections’ | ‘Landsat Approximate Surface Reflectance’for Landsat data or the corresponding menu selection for SPOT, ASTE or EO-1ALI. After the file is read in, the Dark Area Data Input form will become visible.184