Investigation of the method for creating seamless mosaics of orthorectified aerial images
Students Name: Matias Anton Serhiiovych
Qualification Level: magister
Speciality: Photogrammetry and Remote Sensing
Institute: Institute of Geodesy
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: Matias A.S. Kolb I.Z. (supervisor) "Study of the method of creating seamless mosaics of orthotransformed aerial photographs". Master’s thesis. - Lviv Polytechnic National University, Lviv, 2020. Extended abstract In modern photogrammetric production, the creation of orthophotos is one of the most common tasks. Orthophotoplans are a universal product that is widely used as a basis for various types of topographic products, primarily for geographic information systems for various purposes [1]. An orthophotoplan is a photographic image of an area constructed in orthogonal projection, obtained from one or more mounted transformed photographs. The photo plan meets all the requirements for accuracy and information load, which are put forward to the topographic plan or map of the appropriate scale [2]. The object of research is the process of orthotransformation of aerial photographs and stitching of orthotransformed digital aerial photographs into a single raster image. The scope of research is the method of obtaining a seamless orthophoto plan with the help of correctly drawn lines of decay and with observance of the parameters of geometric and radiometric quality of the orthophotoplan. The purpose of the thesis is to study the methods of forming mosaic lines - one of the important stages in the creation of orthophotoplans, which is difficult to automate and requires the involvement of both photogrammetric and computer image processing technologies. In the first section of the thesis the analysis of methods of digital orthotransformation of aerial photographs is performed. The analysis of the literature sources which cover methods of the decision of a problem of carrying out lines of stitching of pictures in a mosaic is implemented. Transformation of images from the central projection into orthogonal projection and their reduction to a certain scale provides high measuring properties of orthophotos [3]. Instead, the image properties depend on both the radiometric quality of the input aerial photographs and the quality of their stitching into a mosaic [4]. The second section describes the basic techniques of computer processing of photogrammetric images to select objects. The results of selecting the outlines of objects within the overlap of the images are used to automatically create lines to stitch the images into a mosaic, in particular in the software package Ortho Vista used in our work [5]. The third section presents the procedure and results of experimental work. We performed an experimental study of these modern software Mosaic Pro (ERDAS IMAGINE), ORTHOVISTA (TRIMBLE) and ArcGIS (ESRI) on the quality of their networks of stitching lines of orthotransformed aero images. The analysis of the simulation results indicates a clear advantage of the software package ORTHOVISTA (TRIMBLE), which implements an object-oriented approach to radiometric and geometric correction of aerial photographs. The fourth section provides information about the organizational structure of the enterprise. The legal support of professional activity related to the topic of work has been worked out. Estimates of work related to the topic of the master’s thesis have been calculated. Key words: orthophotoplan, orthotransformation of aerial photographs, mosaic lines, Erdas Imagine software, digital terrain model. References: 1. Kolb I. Methods of creation and practical application of mask-maps of high-level terrain objects at orthotransformation of digital aerial photographs / I. Kolb // Geodesy, cartography and aerial photography. - Lviv: Lviv Politechnic Publishing House, 2019. - Vol 89. - P. 29–35. http://ena.lp.edu.ua:8080/handle/ntb/45907 2. Dorozhynsky O.L. Fundamentals of photogrammetry: Textbook.- Lviv: Lviv Polytechnic National University Publishing House, 2003. –214p. 3. Keith Johnston. Photogrammetry Workshop Basics of Modern Photogrammetry. NC Property Mappers Conference. October 3 , 2007 4. Victor Jung-der Tsai, Ying_Ting Huang. Automated image mosaicking // Journal of the Chinese Institite Of Engineers, Vol.28, No.2. –pp.329-340 (2005) http://www.ce.nchu.edu.tw/%5C/Pic/Writings/880_JCIE2005-Mosaicing.pdf 5. Evstratova LG Creation of "real" orthophotos (True Ortho) on aerial photographs using the software package INPHO // Geodesy and Cartography. -2011 -№ 3 –p.29-32