<p>This dataset collects 1999 Landsat (TM) remote sensing image data from Tajikistan. It is decompressed data from level 0 raw data in gz format. The data comes from the USGS website. TM data covering the entire territory of Tajikistan requires 14 scenes. This dataset collects 14 scenes. The covered track numbers are: 149034, 150033, 150034, 151033, 151034, 151035, 152033, 152034, 153032, 153033, 153034, 154032, 154033, and 154034</p>
This dataset is the originally downloaded gz format data file. Each gz data contains 12 data files, including 9 TIF files of 8 bands (B6 contains 2 TIF files), 2 txt text files and README.GTF file. The Landsat project was initiated by the USGS of the United States to provide reliable quality remote sensing data for research and application activities. Landsat 1, 2 and 3 payloads are multispectral (MSS) sensors, Landsat 4 and 5 payloads are both multispectral (MSS) and thematic mapper (TM) sensors, and Landsat 7 payloads are enhanced thematic mapper (ETM+) The data in this dataset is Landsat 7 data.
This dataset comes from the USGS EarthExplorer data website. The main processing processes include: Enter the regional latitude and longitude, time range, and cloud cover conditions on the USGS EarthExplorer data website to obtain a data list within the region. From the data list, select satellite image data with less cloud cover and reliable quality by viewing image thumbnails one by one, and add it to the data basket. After ordering, the data website returns the data address, and downloads the data with the help of a batch download tool. After the data download is completed, data verification and reorganization will be carried out to delete invalid data that is not fully downloaded and repeatedly downloaded data, and verify the integrity of the downloaded data.
This dataset is data from the Landsat ETM+ sensor of Landsat 7. The sensor includes 8 spectral bands, covering the visible light and thermal infrared range, with spatial resolutions of 15 meters (panchromatic band), 30 meters (multispectral band) and 60 meters (thermal infrared band). The panchromatic band (PAN) can be integrated with multi-spectral bands to improve the accuracy of feature classification. Compared with previous generation TM sensors, ETM+ has improved resolution in the infrared band, added 15 meters of resolution in the panchromatic band, and increased resolution in the thermal infrared band from 120 meters to 60 meters. ETM+ adopts two modes: high gain and low gain, which are dynamically adjusted according to latitude and seasons to avoid over-saturation or dark data. Add a full aperture solar calibrator (FASC) and a partial aperture solar calibrator (PASC) to improve the accuracy of radiation calibration. The Landsat series satellites have a revisit cycle of 16 days and support dynamic environmental monitoring. The SLC failure in 2003 resulted in missing strips in subsequent data (which needed to be repaired in conjunction with gap mask), but pre-failure (SLC-on) data is still an important source for high-precision surface research. Landsat 7 ETM+ data is widely used in environmental monitoring, disaster assessment (such as post-earthquake surface change analysis), agricultural yield assessment and other fields. Its multi-spectral and thermal infrared combination capabilities are still of scientific research value. This data set is taken from the segmented data (i.e., one period a year) with the lowest cloud cover and the best phase (the best vegetation growth) among the data available during the year. It covers a total of 14 scenes segmented data across the tower. This data set collected 14 scenes segmented TM data that match the regional scope and time range, and the integrity of the data set is 100%
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