Wyniki wyszukiwania - BazTech

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Infrastructure for 3D Modeling of Historical Fountains in Istanbul with GIS-Based Procedural Approach

Şenyurdusev Güçlü, Özgür Doğru Ahmet

Geomatics and Environmental Engineering

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2024

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Vol. 18, no. 2

51--72

EN

Along with the concepts of “smart city” and “digital twin,” the 3D (threedimensional) city models have started to be used as a basis for many studies that have been carried out in recent years. The most important and basic components of 3D city models are the structures that are located in the cities. However, some small structures of historical importance are within the category of the buildings in a city but are often not as large as a building. Historical fountains are some of these structures. For this reason, modeling with existing 3D city model-production methods is a little more complicated and requires local measurements and detailed modeling studies. As a result, this study has designed a database scheme design in which the historical city wall fountains in Istanbul can be stored in a spatial database and modeled in three dimensions (with procedural modeling when necessary). In addition, the conveniences that this infrastructure will provide in the production of 3D structure models and some difficulties that were encountered during these studies are also discussed and examined.

2

Nadir & oblique aerial imagery – new possibilities in 3D mapping

Gajski Dubravko, Dzięgielewska-Gajski Katarzyna

GIS Odyssey Journal

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2023

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Vol. 3, no. 1

137--147

EN

The new generation of aerial photogrammetric cameras brings camera constructions with several fields of view, instead of a traditional vertical one, which, in addition to vertical images, also enable oblique images. Although this imaging method allows higher quality when making a 3D model of the imaged area, it is still not used in Croatia. This paper describes the technology of aerial photogrammetric cameras with multiple fields of view and the advantages of using nadir & oblique aerial imagery, especially in photogrammetric algorithms that allow automated orientation and measurement of images. The tests were performed on nadir and oblique images taken by Vexcel Osprey nadir & oblique camera. Finally, the result obtained only with vertical images was compared with the result with oblique images when making a 3D model of the urban area. Special attention to the quality of modeling of buildings and urban vegetation is drawn and discussed.

3

Transformation of 3D geospatial data into CityGML - a case of Prague

Janečka Karel

Reports on Geodesy and Geoinformatics

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2019

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Vol. 107

41--48

EN

The 3D geoinformation is becoming important for cities and their policies. The cities are therefore exploring the possibilities of 3D virtual city models for more efficient decision making. To maximize the economic benefit of such data, the cities can provide their 3D geospatial data for further usage, and so, new applications can be created. The paper defines a way how the freely available 3D geospatial data of Prague can be transformed from the proprietary data format into the open data model. The 3D geospatial data about the buildings, bridges and digital terrain model were transformed from the 3D shapefile into the CityGML. This is an application independent information model and exchange format. This will allow for the wider use of the 3D city model by different groups of users. The generated CityGML files were further imported into the spatial database with appropriate database CityGML-based scheme. It enables more efficient management and querying of CityGML data. To enable the wider audience to explore the 3D city model, the visualization in the web environment was also explored. The paper also presents the way how the attributes from the external data sources can be connected to the 3D objects in the web environment.

4

Techniki fotogrametryczne stosowane w modelowaniu 3D miast

Rotchimmel K., Kacprzak M.

Prace Instytutu Lotnictwa

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2016

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Nr 2 (243)

198--204

PL

Głównym celem artykułu jest ukazanie możliwości generowania teksturowanych modeli brył budynków z wysokorozdzielczych zdjęć lotniczych, na obszarze o gęstej zabudowie. Wykorzystanie tego rodzaju danych źródłowych narzuca zastosowanie określonego procesu technologicznego. Przedstawione zostaną sposoby pozyskiwania kolejnych produktów pośrednich tj.: surowej chmury punktów. NMT, przestrzennych wektorowych modeli budynków, true ortofotomapy i realistycznych tekstur ścian bocznych. Przedstawiony zostanie również sposób ich końcowej integracji przy użyciu oprogramowania typu GIS. Następnie zaproponowana zostanie analiza dokładnościowa. która pozwoli na określenie standardów, które spełnia utworzony 3D model miasta.

EN

The main purpose of this article is to show a possibility to generate textured building models from high resolution aerial images in densely built-up areas. The use of this type of data source suggests/implies/imoses the use of a particular process. The following paper describes how to acquire further intermediates, i.e .: the raw point cloud. DSM. DTM. space models of buildings. True Ortho photos and photo-textures. Next, a possible way of their final integration by using GIS software was presented and how an implementation of a precision analysis which allows the user to specify standards that meet the created 3D city model can be made.