Mapping (Cartography)

These four SIR-C/X-SAR images of the Long Valley region of east-central California illustrate the steps required to produce three-dimensional data and topographic maps from radar images using a technique called interferometry. The image in the upper left shows L-band radar image data. The image in the upper right is an interferogram of the same area, made by combining L-band data from the two SIR-C/X SAR flights (April and October 1994). The colors in this image represent the difference in the phase of the radar echoes obtained on the two flights. The image in the lower left shows a topographic map derived from the interferometric data. The image in the lower right is a three-dimensional perspective view of the northeast rim of the Long Valley caldera, looking toward the northwest. To create this image, SIR-C C-band radar image data are draped over topographic data derived from the interferometry processing. Combining topographic and radar image data allows scientists to examine relationships between geologic structures and landforms, and other properties of the land cover. LightSAR's Potential Contribution: LightSAR's polarimetric and interferometric modes are extremely useful tools for mapping the changes in various features of the Earth's surface. Maps derived from these modes can be combined with existing maps of roads and surface topography, as well as power and water distribution systems. Adding these maps and cartographic data into geographic information systems (GIS) will generate a powerful database and picture of the Earth. These data will enable more efficient and intelligent land use and hazard planning, as well as scientific studies of the changes in nature. Many companies are involved in the billion dollar GIS industry. Technical Details and Theory Industry Association Links References

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