Sar Data Acquisition for Event-driven Mapping of Urban Areas Using Gis
نویسندگان
چکیده
Airborne SAR systems allow a flexible ground mapping with high geometric resolution, independent from daytime and weather conditions. This offers the opportunity of using this technology for the analysis of built-up areas. However, the oblique SAR illumination limits the visibility of certain objects in urban areas depending on the viewing direction. Especially at building locations different SAR specific phenomena like layover, shadow, and multipath-propagation burden the interpretation of the SAR imagery even for experts. But, in case of bad viewing conditions, SAR may be the only way to map special events (e.g. flooding, fire, earthquake). In this paper, the benefit of the utilisation of different kinds of GIS data for the SAR mission planning and the analysis of acquired SAR data after such an event are discussed. Simulations based on 3D models of the scene and maps can optimise the SAR data acquisition parameters. In a similar manner fusing the gathered data with the GIS data can support an image interpreter.
منابع مشابه
Automatic Interpretation of High Resolution Sar Images: First Results of Sar Image Simulation for Single Buildings
Due to the all-weather data acquisition capabilities, high resolution space borne Synthetic Aperture Radar (SAR) plays an important role in remote sensing applications like change detection. However, because of the complex geometric mapping of buildings in urban areas, SAR images are often hard to interpret. SAR simulation techniques ease the visual interpretation of SAR images, while fully aut...
متن کاملEvent-driven Change-detection in Urban Environments Using Sar
SAR sensors are able to operate under nearly all weather conditions, at daylight or in the night. This is especially beneficial for event-driven applications, like time-critical change-detection for disaster management. Unfortunately, SAR systems suffer from occlusions and ambiguities, especially in urban areas. Additionally, due to layover and foreshortening effects, the geo-referencing of SAR...
متن کاملIntegration of remote sensing data and GIS for accurate mapping of flooded areas
This paper describes a synergetic use of satellite radar images and ancillary information to detect ooded areas at their peak and evaluates its potential with mapping. The procedure was tested on the catastrophic ood that occurred in Regione Piemonte in Italy in November 1994. Two ERS-1 synthetic aperture radar (SAR) images were processed, one acquired one month before the ood and the oth...
متن کاملUrban Land-cover Mapping and Change Detection with Radarsat Sar Data Using Neural Network and Rule-based Classifiers
This paper presents a new approach to extract urban landuse/land-cover information from high-resolution radar satellite data. Fivedate RADARSAT fine-beam SAR images over the rural-urban fringe of the Greater Toronto Area were acquired during May to August in 2002. One scene of Landsat TM imagery was acquired in 1988 for change detection. The major landuse/land-cover classes were high-density bu...
متن کاملA change detection approach to flood mapping in urban areas using TerraSAR
Very high-resolution Synthetic Aperture Radar sensors represent an alternative to aerial photography for delineating floods in built-up environments where flood risk is highest. However, even with currently available SAR image resolutions of 3 m and higher, signal returns from man-made structures hamper the accurate mapping of flooded areas. Enhanced image processing algorithms and a better exp...
متن کامل