| 9 | 9 | The raw data format from these sensors is ENVI band interleaved by line (BIL) files, which is a simple binary data format. Each BIL file comes with an accompanying header file in a human readable text format. The header file contains information about the BIL file format and specifications of the sensor at time of data capture. The Eagle raw data files contain data 12-bit data (0-4095) stored as 16-bit integer, whilst the Hawk raw data are 14-bit (0-16383) stored as 16-bit integer. The first pixel of the first band of each raw file is the frame counter pixel, which is essentially a frame id tag that increments by 1 through out the file. At the end of the raw file, after data capture for this flight line, a number of lines of data are captured with the shutter closed. These lines are refered to as "dark lines" and give sensor ccd values for when no light is present. |