BOREAS Level-2 MAS Surface Reflectance and Temperature Images in BSQ Format Image data collected with Moderate Resolution Imaging Spectroradiometer (MODIS) Airborne Simulator (MAS) flown on NASA C-130 aircraft between 21 July and 08 August, 1994. Data are 12 band multispectral imagery ranging from 0.547 um to 12.032 um. Data have a nominal pixel resolution of 20m at nadir and 28m at the scanning extremes. The geographic orientation of each scene depends on the direction of the aircraft line of flight. Each image consists of 17 files: File 1 is an ASCII header file. Files 2-10 are separate binary scaled reflectance files for MAS bands 1 to 9 stored as 16-bit data with the low order byte first (swap bytes to get IEEE format data). Each line (row) of the image consists of 716 pixels. The reflectance imagery in these datasets are scaled values based on the ratio of derived radiant energy incident on the sensor aperature and incident radiant solar energy at the time of data collection. Datasets examined used scale factors of 0.001 for bands 1 through 9. To obtain reflectance values for bands 1 through 9 use: R[i] = Band[i] * Scale Factor[i] where: i = Band Numbers 1 - 9. R[i] = Reflectance Values per Band. Band[i] = 2-byte Scaled Reflectance Values. Scale Factor[i] = Scale Factors per Band Listed Above. Files 11-13 are separate binary scaled temperature files for MAS bands 10 to 12 stored as 16-bit data with the low order byte first (swap bytes to get IEEE format data). Each line (row) of the image consists of 716 pixels. The imagery in these datasets are scaled surface temperature at the time of collection in the specific band. Datasets examined used scale factors of 0.1 for bands 10 through 12. To obtain temperature values for bands 10 through 12 use: T[j] = Band[j] * Scale Factor[j] where: j = Band Numbers 10 - 12. T[i] = Temperature Values per Band. Band[i] = 2-byte Scaled Temperature Values. Scale Factor[i] = Scale Factors per Band Listed Above. File 14 has relative X coordinates stored as 32-bit binary values in tenths of a meter (low order byte first). File 15 has relative Y coordinates stored as 32-bit binary values in tenths of a meter (low order byte first). File 16 has scaled view zenith values stored as 16-bit binary values in tenths of a degree (low order byte first). File 17 has scaled view azimuth values stored as 16-binary values in tenths of a degree (low order byte first). File naming convention ex: masl2ssa-fen_072494_1624-1628* Mas level 2 = masl2 Site name ex: ssa-fen Date ex: 072194 Time range ex: 1624-1628 * - .hdr for header file _b1.bsq - _b12.bsq for bands 1-12 _x.bsq relative x position _y.bsq relative y position _z.bsq scaled view zenith _az.bsq scaled view azimuth Collection dates include Date Site Number of Flightlines (images) =========== ===== ============================== 21-Jul-1994 SSA 10 08-Aug-1994 NSA 7 04-Aug-1994 NSA-YJP 3 NSA-OBS 3 21-Jul-1994 SSA-90A 3 SSA-OBS 3 SSA-OJP 3 SSA-YJP 3 SSA-FEN 3 24-Jul-1994 SSA-9YA 3 SSA-FEN 3 Image rows: Varies, as stated in header file. Image columns: 716 pixels. Viewer Images ====== ===== Image data were loaded as 12 band, unsigned 16-bit images. Data were downsampled by the respective factors listed below in X and Y using the ERDAS Imagine degrade function to create File Name Degrade Factor mas2-ssa-07-21-1994-1638-dg8.img 8 mas2-nsa-08-08-1994-1541-dg3.img 3 These downsampled images were displayed in Imagine as pseudo-colored images using respective band combinations listed below for Red, Green, and Blue and captured using the Imagine's "Viewer to Img" function. JPEG preview images from each were created using Image Alchemy v. 1.10: File Name Source Bands for RGB (Bands 1 to 3) mas2-ssa-07-21-1994-1638-dg8.jpg 9,6,1 mas2-nsa-08-08-1994-1541-dg3.jpg 9,7,2