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• W2182466730 abstract "There are requirements in many fields of the earth science for the accurate knowledge of terrain topography. Nowadays, ASTER data provides valuable data sources for this field. ASTER stereo imagery is now being acquired and it is hoped that, throughout its 5 years mission, most of the earth’s land surface will be imaged in stereo (since, there are the stereo bands in its products). It provides a major data source for generating high resolution DEMs for most parts of the world at a relatively low cost using push broom scanning. In push broom scanner each image line has its own nadir point. When the viewing is in a vertical plane, the nadir point is in the image line. Also here relief displacement is radial with respect to the nadir point, thus it is only within the line, away from the nadir point. When the viewing plane of the sensor is not vertical (e.g. backward view) the nadir point may be far away from the image line. In this case all vertical structures lean the same way in flight direction. This is in addition to the sideways leaning effect shown explained above that it causes consistence shift in the satellite images. In this approach the geometry of 1A and 1B level products of ASTER images at several parts of the globe are studied to digitize accurate contour lines in ILWIS software because of its availability for many users (user friendly and suitable cost). ILWIS is GIS software, which can also makes stereo pairs for viewing satellite images and aerial photographs in stereo. This can be used for digitizing lines of constant parallax (in row-parallax on the screen, i.e. ∆ col= 0). So, several epipolar stereo pairs from some parts of the earth generated to find out the relation between height and column-parallax (using ground control points). This relation used to digitise contour line in ILWIS. The comparison between the digitized and existing contour lines showed the shift in the image caused by the effect of side look angle. Thus, the mathematical formulation defined to calculate the shift and used to correct it. ASTER DATA ASTER is an advanced multispectral imager, which is flying on Terra polar orbiting spacecraft with other 4 sensors under international cooperation. ASTER stands for the Advanced Space borne Thermal Emission and Reflection radiometer. The Terra spacecraft is operated in a circular, near polar orbit at an altitude of 705 km. The orbit is sunsynchronous that cross the equator at 10:30 a.m local time. The repeat cycle is 16 days. Thus, the orbit parameters are the same as Landsat except for the local time. The instrument covers a wide spectral region from the visible to the thermal infrared by 14 spectral bands" @default.
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• W2182466730 date "2004-01-01" @default.
• W2182466730 modified "2023-09-25" @default.
• W2182466730 title "QUALITY STUDY OF ASTER DATA GEOMETRY BY DIGITIZE CONTOUR LINES IN ILWIS" @default.
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