Katarzyna Bobkowska

Implementation of spatial information for monitoring and analysis of the area around the port using laser scanning techniques

Abstract Nowadays, maritime infrastructure is heavily exploited, which requires monitoring. The article presents the implementation of spatial information which are point clouds for monitoring and analysis of the area around the port (buildings and wharves). For this study, point clouds coming from terrestrial (TLS) and airborne laser scanning (ALS), each of them having different accuracy, were used. An important part of the analysis was the integration of the two data sources. Through integration, the acquisition of information on areas not covered by the measurement in the presented case, one of the methods was possible for use (e.g. the roofs in case of TLS, or the lack of some of the walls of buildings in case of ALS). Another aspect was to use this data. Measurement of the shape and geometry of objects was executed. Additionally, the planeness analysis of individual elements of port infrastructure has been carried out. An interesting analysis was to determine the water level, based on relation to specific characteristics of the light reflectance.

A METHOD OF SELECTING LIGHT SOURCES FROM NIGHT SATELLITE SCENES

ABSTRACT Satellite images carries a lot of data. Very sophisticated methods of analyses may reveal very complicated nature of the observed objects. In case of night images, lights play the role of information sources. In this paper we would like to present results of the research aimed to describe light sources from satellite night images by providing description of their luminosity. The authors point source imaging data from the satellite systems available for use in the remote sensing analyses. They also present researches on the analysis of light propagation based on measurements of radiance of night city lights on the basis of modern satellite imaging systems and models of light propagation in the atmosphere. The paper includes a description of the technology of satellite scenes remote sense analysis with successive steps of the creation of night lighting map. The purpose of the article, in addition to the presentation of the current scientific achievements, based on the night satellite images showing the potential of this technology, is an attempt to draw attention to the problem of light pollution and to make a simple analysis of this phenomenon on the basis of such imaging.

3D MODELLING OF CYLINDRICAL-SHAPED OBJECTS FROM LIDAR DATA - AN ASSESSMENT BASED ON THEORETICAL MODELLING AND EXPERIMENTAL DATA

Despite the increasing availability of measured laser scanning data and their widespread use, there is still the problem of rapid and correct numerical interpretation of results. This is due to the large number of observations that carry similar information. Therefore, it is necessary to extract from the results only the essential features of the modelled objects. Usually, it is based on a process using filtration, followed by simplification and generalization of redundant contents of datasets. This process must ensure the collection of new data without loss of information contained therein, the description accuracy of the key features of a measured object, as well as the uniqueness and comparability of results. In this paper, the authors extend the already extensive range of algorithms for the automatic or semiautomatic modelling of cylindrical objects, which have been measured using the laser scanning technology, with the one employing a concave hull or-in general-the alpha-shape (α-shape). The applicability of the proposed method was analysed using simulated data-generated analytically with the introduced and established systematic error with normal distribution-and using real results of the measurement of cylindrical-shaped objects. For real data, the obtained results were compared with the reference data. This made it possible to determine the validity of the proposed new method.

A new method of presosns identification based on comparative analysis of 3D face models

The article presents the use of modern close range photogrammetry for possessing highly accurate 3D models of the human face (including the ears). Modern methods used to obtain precise data describing the construction of a human face, and even the whole human body, should allow to get finished measurement material in a very short time. Those features belong to the optical scanning technology. Comparative analysis of models of the human face has been made (created from the cloud of points obtained from optical scanner) for the same person as well as for two different persons. Among other things, the parameters describing the similarity of a human face (in particular, the similarity of the human ear) based primarily on the analysis of the differences between the points of the model (comparison of several hundred thousand points on the model) were determined. Ultimately, these parameters can be used to identify persons. Considering the great opportunities presented methods, other potential applications have been presented.

A PROPOSAL FOR ONE-IMAGE PHOTOGRAMMETRY SYSTEM FOR MEASURING THE CLEARANCE DISTANCE. CASE STUDY

Measurement of the clearance distance (both in the context of the rail and road) is one of the current and increasingly discussed topics in the context of photogrammetric and image processing (computer vision) methods. The article presents a description of a simple and rapid method of measure the clearance distance between the obstacles by using one-image photogrammetry. The proposed method was tested for the railway, tram and road clearance measurements. This method is based on placing (dynamic or static) testing board in the clearance distance between the relevant obstacles. In addition, this method involves the use of non-metric camera to take images with the appropriate distance, which is dependent on the clearance distance. Before taking a picture, the camera should be calibrated and appropriate parameters should be set. Then the pictures are processed using the appropriate software. Finally we have a fully metric image, which can be used for doing measurements. Achieved accuracy oscillated within 1-2 pixels. One of the advantages of this system is the speed of measurements collected at the field session. This method is much more economically and financially efficient than currently known systems for doing such a measurements, which are based on metric cameras or surveying instruments.