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Images and Image Display
Published in Julio Sanchez, Maria P. Canton, William Perrizo, Space Image Processing, 2018
Julio Sanchez, Maria P. Canton, William Perrizo
Since a scene is not a graphics image we cannot expect to display scene data on a computer monitor using nonspecialized commercial software. Furthermore, often the scene contains more image data than can be handled by a computer graphics system. For example, a Thematic Mapper scene is encoded into seven radiation bands, and contains raw pixel data for an image rectangle of approximately 5000 by 6000 pixels. Since a computer graphics monitor can rarely display more than 1500-by-1200 pixels, the entire scene cannot be shown at once. Additionally, conventional computer graphics hardware is based on a technology that uses the three primary colors, red, green, and blue. Since the Thematic Mapper scene contains information for seven radiation bands, the processing software has to decide which three of the seven bands are mapped to the red, green, and blue display attributes. In other words, the scene data is more space extensive and radiation intensive than can be handled by conventional graphics display systems.
Remote Sensing Over Natural Water
Published in Robert P. Bukata, John H. Jerome, Kirill Ya. Kondratyev, Dimitry V. Pozdnyakov, of Inland and Coastal Waters, 2018
Robert P. Bukata, John H. Jerome, Kirill Ya. Kondratyev, Dimitry V. Pozdnyakov
With the launch of Landsat-4 in 1982, Landsat Thematic Mappers (TM) have enabled the collection of environmental data in more spectral bands of higher spatial resolution and higher precision than are possible with the MSS. The Thematic Mapper is a multispectral scanning device that records (as integers that are proportional to) upwelling radiances in six reflective energy bands in addition to an emissive thermal band. The six reflective spectral bands have a spatial resolution of 30 m, while the thermal band has a spatial resolution of 120 m.
Land use and land cover changes resulting from the urban El Molinito reservoir in the drying Sonoran River Basin
Published in Urban Water Journal, 2022
Rolando E. Díaz-Caravantes, Jose R. Romo-Leon, Romeo Mendez-Estrella, Christopher A. Scott
To achieve this goal, we used remote sensing analysis to measure land use changes over the long term. We used Landsat Thematic Mapper (TM) multitemporal scenes to obtain thematic land cover and land use maps (from 1993 to 2011). We consider the 30-meter spatial resolution of Landsat to be ideal for land cover classifications and regional land cover change analysis. In addition, Landsat 4–5 contains images covering the time period of interest for our study, i.e. over approximately ten-year intervals (1993, 2002 and 2011) to analyze changes in LULC associated with the construction in 1991 of El Molinito dam. Because Landsat 4–5 stopped operating in 2011, and the effects of dam construction were already evident over two decades, we decided end the classification using the final imagery available from this sensor instead of using a different sensor such as Landsat 8 OLI to further extend the classification time period. In addition, we considered that a period of 18 years (from 1993 to 2011) was sufficient to temporally and spatially observe the socio-environmental consequences of dam construction and associated water resource use decisions.