Dhaka Metadata file: All satellite image files, TIFF and Lan, were generated from the same Landsat 7 ETM+ scene. Included in the download folder are two Lan files that were generated using MultiSpec software. In addition to the Lan files, numerous color composite images were generated using MultiSpec. Each of these images enhances different features of the satellite image. The color composites were saved as TIFF files and retain their geographic information. The TIFF color composites were 2 percent tail clipped enhanced instead of showing the entire range of the data. If the entire range is needed then a new image needs to be generated using the MultiSpec display specification. (1) LAN files and name: 2001_01_29_Dhaka.lan, 6.6 mb Lines: 1000 Number of bands: 7 Columns: 1000 Band Format: BIL 2001_01_29_Dhaka_s1.lan, 6.6 mb Lines: 1129 Number of bands: 7 Columns: 877 Band Format: BIL 2001_01_29_Dhaka_s2.lan, 7.3 mb Lines: 1257 Number of bands: 7 Columns: 877 Band Format: BIL In the file name is the following information: yyyy = four digit year of acquisition, mm = two digit month, dd = two digit day, PLACE = five letters of location, s = a subset of the image. If new files are generated from the Lan files using MultiSpecs' change image file format, then it is recommended that above data remain in the file name. Also this metadata file should be saved in the file folder to be referred to in the future. The TIFF files use the same naming system for acquisition date and place name. In addition, the channels used to create the 3 channel color composite are included in the file name. The "chs" is the abbreviation for channels used by MultiSpec. After the "chs" are the Landsat 7 ETM + channel used. Below, see item number 3, which band of data corresponds to which number is explained. Additionally, you can refer to the Landsat PowerPoint presentation; insert address, to explain more about the uses of different color composite images. TIFF files and name: 2001_01_29_Dhaka_chs321 2.81mb TIFF files and name: 2001_01_29_Dhaka_chs432 2.81mb TIFF files and name: 2001_01_29_Dhaka_chs542 2.81mb TIFF files and name: 2001_01_29_Dhaka_chs742 2.81mb TIFF files and name: 2001_01_29_Dhaka_s1_chs321 2.81mb TIFF files and name: 2001_01_29_Dhaka_ s1_chs432 2.81mb TIFF files and name: 2001_01_29_Dhaka_ s1_chs542 2.81mb TIFF files and name: 2001_01_29_Dhaka_ s1_chs742 2.81mb TIFF files and name: 2001_01_29_Dhaka_s1_chs321 3.1mb TIFF files and name: 2001_01_29_Dhaka_ s1_chs432 3.1mb TIFF files and name: 2001_01_29_Dhaka_ s1_chs542 3.1mb TIFF files and name: 2001_01_29_Dhaka_ s1_chs742 3.1mb ---------------------------------- (2) Geographic information: UTM zone 46 N Pixel size= 30 meter, including the thermal band which is usually 60 meter resolution. The thermal band was resampled to create the .lan file. (3) Thermal band was included as channel 6 in the lan file. Which Landsat band is in which channel: Landsat 7 ETM+ channel 1= band 1(Blue, 0.45 - 0.52 um) Landsat 7 ETM+ channel 2= band 2(Green, 0.52 - 0.60 um) Landsat 7 ETM+ channel 3= band 3(Red, 0.63 - 0.69 um) Landsat 7 ETM+ channel 4= band 4(Near Infrared, 0.76 - 0.90 um) Landsat 7 ETM+ channel 5= band 5(Mid Infrared, 1.55 - 1.75 um) Landsat 7 ETM+ channel 7= band 6(Mid Infrared, 2.08 - 2.35 um) Landsat 7 ETM+ channel 6= band 7(Thermal Band, 10.4 - 12.5 um) --------------------------- (4) Acquisition date: January 29, 2001: Landsat 7 ETM+ Path: 137 Row: 044 BACKGROUND: The launch of the Landsat-7 satellite on April 15, 1999, marks the addition of the latest satellite to the National Aeronautics and Space Administration's Landsat satellite series. The Landsat-7 satellite carries the enhanced thematic mapper plus (ETM+) sensor and is part of an ongoing mission to provide quality remote sensing data in support of research and applications activities. Information on the Landsat-7 Program, including information about the Landsat-7 satellite, the ETM+ sensor, and Landsat-7 data collection, is available in the "Landsat 7 Science Data Users Handbook." http://ltpwww.gsfc.nasa.gov/IAS/handbook/handbook_toc.html