User Manual - pancroma

Digital Globe Bundle’ | ‘Save as 16-Bit’ or alternatively, ‘Display Files’ |‘Decompose Eight File Digital Globe Bundle’ | ‘Save as 8-Bit’.IMPORTANT NOTE: Digital Globe data is offered in both 8-bit and 16 bitformats. If you have 16-bit format, you can unbundle your Digital Globe data intoeither 8-bit or 16-bit format. It is advisable to save in 16-bit format to preserve thefull precision of the dynamic range of the digital numbers in the band files.However, if your data is 8-bit format, or if you wish to use PANCROMA utilitiesthat only handle 8-bit format, you will have to save the unbundled band file datain8-bit format. When prompted, give the band files a root name and a numericalsuffix will be attached designating the band numbers when the eight individualGeoTiff band files are saved.Now it is possible to run the Spectral Analyzer TM . This is done exactly asdescribed in the preceding sections Select ‘File’ | ‘Open and open the eightWorldView2 band files, band1, band2, band3, band4, band5, band6. band7 andband8. (WorldView2 spectral band data is given in Section 34). Now select‘Spectral Analysis’ | ‘WorldView2 Spectral Analyzer’ | ‘Eight 16-Bit Bands’ |‘Manual Method’ or ‘Spectral Analysis’ | ‘WorldView2 Spectral Analyzer’ | ‘Eight8-Bit Bands’ | ‘Manual Method’ depending on the file format you selected whenunbundling.The Spectral Criteria Form will be displayed as described in the previoussections. Set your selection criteria using the track bar sliders. When you arefinished, select ‘OK’. Afterwards, a second data entry box will be displayed forentering the appropriate TOA Reflectance data. You will have to enter themetadata for each WV2 band file as it will probably be different for each one.The computation of TOA reflectance for WorldView2 data is described in theDigital Globe publication entitled Radiometric Use of WorldView-2 Imagery. Thispublication is available at the Digital Globe website and on thewww.PANCROMA.com/data web page. Additional information regarding IMDfiles and calibrating WorldView2 data is shown in Section 34.Because the calibration factors and effective bandwidth values are typicallydifferent for each band, they have to be entered eight times. (Note that the solarelevation angle and Julian day data only has to be entered once. Theappropriate data entry form will appear eight times to allow input of the values.(The data can be found in the .IMD file that accompanies each WorldView2 dataset. When you select OK the final time, PANCROMA TM will compute thepercentage of red pixels on the active part of the image and display them in theMain Window dialog box as described above.247