The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The goal of this work is to exploit the slant-range measurements reaching centimetre accuracies using only the amplitude information of SAR data acquired by TerraSAR-X satellite sensor. The leading idea is to evaluate the positioning accuracy of well identifiable and stable natural and man-made Persistent Scatterers (PS's) along the SAR line of sight. New Earth observation SAR (Synthetic Aperture...
Image registration technology is getting more and more important in nowadays. The accuracy of the registration resolution plays an important. In this passage, we present an image registration algorithm based on point feature of sub-pixel, which can improve the accuracy. Firstly we use Harris corner point algorithm to get point features, then we use our method to refine the Harris points, after that...
InSAeS4 is an Italian X band airborne SAR system, recently upgraded to a multi-antenna interferometric configuration. The system is able to acquire single pass across-track and along-track multi-baseline data with different acquisition modes characterized by different geometric resolutions and across-track swaths. In recent work we have analyzed the high resolution InSAeS4 products (obtained by transmitting...
We propose a practical 3D method for measuring translucent objects with high accuracy. We improve the accuracy of the measurement by a high-frequency dashed line projection to a target object, which eliminates the influence of subsurface scattering while maintaining higher image contrast. For efficient measurement, multiple dashed lines are projected at the same time and we identify them without error...
Monitoring ground deformation and structural movements is an important task in order to prevent hazardous and harmful situations for the population. MetaSensing's FastGBSAR (Fast Ground-Based Synthetic Aperture Radar) is a novel sensor system, which allows the monitoring of deformation and vibration of natural and man-made structures. This paper describes two examples of application of the FastGBSAR...
Imaging only azimuthally-polarized light from single fluorescent molecules avoids emission from the z component of their transition dipole moments, resulting in accurate measurement of location regardless of emitter orientation and degree of objective lens misfocus.
In this paper, we analysed and compared the digital elevation model (DEM) based on high resolution QuickBird and Pleiades satellite stereo images. 3D maps were generated for objects like trees near poles of power transmission lines using satellite stereo images. This study was very challenging due to weather condition, hilly and non-uniform terrain at Kota kina balu in East Malaysia. First we require...
The colors in universe have sharp boundaries everybody is aware of specifically wherever a color starts and wherever it ends and that any color communicates the details about the targets in the scene in a much better way and that this detailed information can be used to further polish the interpretation of an imaging system. In this paper, the proposed subpixel level arrangements of spatial dependences...
Correct identification of obstacles at the periphery of airports is an important issue to ensure safe takeoff, flight, and landing to aircrafts. This work is carried on as part of the obstacle risk assessment and risk mitigation operations in the aviation security framework. This paper presents a novel fully automatic remote sensing methodology for the detection, shape and signature extraction and...
Panchromatic (PAN) satellite imagery comprises only a single band but it has finer resolution in comparison to the multi-spectral band imagery. In the case of feature extraction and classification, although the multi-spectral imagery has an advantage in availability of the different aspect of spectral properties of the ground coverage, the recent studies introducing intelligent classification and...
For validating the polarimetric & polarimetric-interferometric SAR modelling of vegetation, involved in biomass or surface moisture estimation at large scale, very high resolution polarimetric SAR acquisition on representative vegetated area could be useful. At resolution close to the wavelength such as 4 cm at X-band, the different scattering mechanisms can be spatially resolved. Several recent...
Recently, some commercial software to generate digital surface model (DSM) were provided from some vender. One software is based on the bundle method using conventional Photogrammetry, another one is based on structure-from-motion method (SfM) under computer graphics technology. It is wavered to choose which software to generate DSM derived from drones. In this work, the accuracies of DSM were verified...
Radargrammetry is a well-established technique for deriving digital surface models (DSMs) from synthetic aperture radar images. This work focuses on the novel Staring Spotlight mode of the TerraSAR-X satellite which delivers images with a GSD down to 16 cm. Employing such images, the 2D and 3D geo-location accuracy of the physical sensor models — integrated into SAR range/Doppler equations — is assessed...
Raster scanning is a method for producing or recording a video or a digital image by means of a line-by-line sweep. The scanning process basically transforms a 2D image representation into a 1D representation. While such process has been extensively used for data transmission and storage as well as in most image displaying and capturing devices, its application to Digital Elevation Models (DEM) research...
We present a method based on Markov Random Fields (MRFs) for conducting decision level fusion of segments derived from multiple images of the same region. These images are not required to share the same resolution or sensor characteristics. By working at the segment level we preserve the advantages of segment based image classification while also incorporating the benefits of using multiple image...
Remote Predictive Mapping can help identifying potential sites for mineral exploration. Elevation information is necessary for this purpose, but current freely available elevation data north of the 60th parallel needs improvement. This paper presents a method for creating stereoradargrammetric digital surface models (DSM) using Radarsat-2 (RS-2) images. The study site is a 23 000 km2 area located...
Only a small percentage of SAR data are immediately used after the acquisition, the remaining part is archived for a future use. Those data could potentially contain unexploited valuable environmental information. In this paper it is explored the possibility to use quick look (QL) images, generated for cataloguing purposes also to provide information on changes occurred on the scene. In the proposed...
In this paper, we propose an improved road detection method from high-resolution remote sensing images by means of a modified path opening and closing algorithm. To detect high curvature roads, we improved previously used adjacency graphs by enlarging the path angle of modified adjacency graphs. Furthermore, to remove noise efficiently, we combined the length of paths with road geometrical features...
Land-Cover databases (LC-DB) are very useful for environmental purposes, but need to be semantically detailed to provide robust and instructive spatial indicators. Moreover, remote sensed data allow to cover large areas with high temporal resolution. Such multi-temporal data are very useful input to discriminate LC classes. Nevertheless, automatic fusion method need to be developed to provide high...
Use of multiple scripts for information communication through various media is quite common in a multilingual country. Optical character recognition of such document images or videos assists in indexing them for effective information retrieval. Hence, script identification from multi-lingual documents/images is a necessary step for selecting the appropriate OCR, due the absence of a single OCR system...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.