Three-line scanner imagery provides three overlapped images in an along-base direction, and creates a possible avenue to obtain higher quality images through the application of the super-resolution. Accurate co-registration of the three images is a key step for super-resolution. However, discontinuities and occlusions resulting from the 3D-to-2D projection cause mis-registration in tradition ...
A complete, high-resolution coastline of Antarctica, extracted from an orthorectified mosaic of Radarsat-1 synthetic aperture radar (SAR) images through a sequence of automated image processing algorithms, is presented. A locally adaptive thresholding method is used to segment the orthorectified SAR images, while image-object formation and labeling, and edge-tracing techniques are used to pr ...
This paper presents a new approach for individual tree crown detection and delineation that is applicable under various imaging conditions. The approach extracts crown area using a region-based active contour model and then detects tree tops within the crown area by considering both spectral and shape characteristics of the crown. The detected tree tops allow subsequent clustering of crown p ...
When remote sensing and GIS products are generated, errors and uncertainties from collection, processing and analysis of image and ground data, and model development, accumulate and are propagated to the maps. The products thus possess many sources of uncertainties that vary spatially and temporally. Spatially identifying the sources of uncertainties, modeling their accumulation and propagat ...
Image template matching is essential in image analysis and computer vision tasks. Cross-correlation algorithms are often used in practice, but they are sensitive to nonlinear changes in image intensity and random noise, and are computationally expensive. In this paper, we propose a template-matching algorithm based on a modified particle swarm optimization (PSO) procedure with a mutual infor ...
HDF-EOS is the standard format for NASA’s EOS data products. Data stored in the HDF-EOS swath structure are in a raw sensor coordinate system and are not rectified to a map projection or geographic coordinate system. The geolocation information is stored as separate fields in a swath. Swath data have to be georectified before they can be integrated and analyzed. Presently, no general purpose ...
Vehicle information is useful in many fields. In this paper, a technique is presented to extract vehicle information from single pass QuickBird images. While passing a target area, the satellite acquires panchromatic (PAN) and multi-spectral (MS) images simultaneously. Because of a small time interval difference between the PAN and MS images, it is theoretically possible to extract tw ...
This paper presents a triangulation-based hierarchical image matching method for wide-baseline images. The method includes the following three steps: (a) image orientation by incorporating the SIFT algorithm with the RANSAC approach, (b) feature matching based on the self-adaptive triangle constraint, which includes point-to-point matching and subsequent point-to-area matching, and (c) trian ...
An automated crater detection algorithm is presented which exploits image data. The algorithm is briefly described and its application demonstrated on a variety of different Martian geomorphological areas and sensors (Viking Orbiter Camera, Mars Orbiter Camera (MOC), Mars Orbiter Laser Altimeter (MOLA), and High Resolution Stereo Camera (HRSC)). We show assessment results through both an int ...
An approach and strategy for automatic detection of buildings from aerial images using combined image analysis and interpretation techniques is described in this paper. It is undertaken in several steps. A dense DSM is obtained by stereo image matching and then the results of multi-band classification, the DSM, and Normalized Difference Vegetation Index (NDVI) are used to reveal preliminary ...
Automatic matching of free-formlinear features in overlapping large-scale imagery over urban areas still remains to be a problem in both the photogrammetric and computer vision communities. Although there is a variety of algorithms that have been developed to solve this problem, reliable results are not always guaranteed. Differences in illumination conditions, relief displacement, and occlu ...
Many aquatic ecosystems in the United States and worldwide are impaired by the over-enrichment of waters by nutrients. In advanced stages, the process of eutrophication can cause harmful algae blooms. This research retrieved the concentrations of suspended chlorophyll (Chl), suspended minerals (SM), colored dissolved organic carbon (DOC), and turbidity (total attenuation) from AVIRIS imagery ...
The paper outlines a method to compare two digital surfaces of the same rock face to detect major changes resulting from detached rocks and deformations. A terrestrial laser scanning survey is used for data gathering. After georeferencing, if the cliff has a complex morphology, a 3D segmentation algorithm is applied to split the whole rock surface into more subregions with an almost planar s ...
The performance of MERIS as a tool for mapping chlorophyll-a concentrations in lake waters has been evaluated using simulated and measured top of atmosphere radiances for Lake Garda (Italy). MERIS observations were simulated using hyperspectral data collected by the MIVIS imaging spectrometer in July 2000. MIVIS data were radiometrically corrected at the sensor altitude using the 6S r ...
The Airborne Three-Line-Scanner (TLS) imaging system has provided proof of the concept of stereo and multispectral mapping using the pushbroom mode because frame digital imaging systems with comparable coverage and resolution have not been available and are not likely to be available in the future. A prototype of the TLS system, the STARIMAGER, was developed jointly in 2000 by the STARLABO C ...
Digital Elevation Models (DEMs) are traditionally acquired from a stereo pair of aerial photographs sequentially captured by an airborne metric camera. Standard DEM extraction techniques can be naturally extended to satellite imagery, but the particular characteristics of satellite imaging can cause difficulties. The spacecraft ephemeris with respect to the ground site during image collects ...
Unmanned air systems (UAS) provide an excellent platform for synthetic aperture radar (SAR), enabling surveillance and research over areas too difficult, dangerous, or costly to reach using manned aircraft. However, the nimble nature of the small UAS makes them more susceptible to external forces, thus requiring significant motion compensation in order for SAR images to focus properly. SAR back ...
A novel method which integrates polarimetric decomposition, object-oriented image analysis, and decision tree algorithms is presented for land-use and land-cover (LULC) classification using RADARSAT-2 polarimetric SAR (POLSAR) data. Polarimetric decomposition which is aimed at extracting polarimetric parameters related to the physical scattering mechanisms of the observed objects can be used ...
In recent years, linear features have been gradually integrated into photogrammetry-related applications to estimate orientation parameters and facilitate object reconstruction, to name just a few. Yet, the correspondence of the conjugate linear features between different spaces or coordinate systems remains crucial to the goal of photogrammetric automation. When establishing exterior orient ...
Bundle adjustment is a well known and reliable method used in photogrammetry for image network orientation which requires relatively accurate initial approximations of image orientations and point coordinates. The initialization problem has proved difficult and a variety of initialization techniques have been proposed. We present a new method that takes advantage of the scaled orthographic p ...