טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentShashkov Alona
SubjectDeveloping a Quantitative Three-Dimensional Visual Analysis
Model for the Urban Environment
DepartmentDepartment of Civil and Environmental Engineering
Supervisors Dr. Dafna Fisher Gewirtzm
Professor Emeritus Yerach Doytsher
Full Thesis text - in Hebrew Full thesis text - Hebrew Version


Abstract

The objective of this work is to develop a volumetric visibility analysis and modeling for environmental and urban systems.

The urban density continuously increases mainly due to the general trend among the population to dwell closer to an urban environment. This fact brings us to the problem of land shortage and the need to preserve quality of life in dense urban environments. One of the parameters to be considered when assessing our spatial comfort is the “perceived density”, defined as a sensory reaction to physical components of the spatial and structural texture of our living environment.

In order to control the density in urban environments, efficient control mechanisms based on parameters defined beforehand are required.

This research focused on the development of a quantitative three dimensional visual analysis model for urban environments. It is based on previous research arguing that the comparative measured volume of visible space can indicate on the comparative perceived density.

The model can analyze visibility in a three dimensional manner and is capable of comparing different built configurations. It could assist architects and city planners during their planning and design process and in urban planning problem solving.

The suggested model is aimed at measuring the visible volume of the observed space from any viewpoint within a 3D urban environment. In order to solve variable geospatial situations both in terms of the size and shape of the urban structures, the 3D raster approach has been adopted. By subdividing the urban environment volume into voxels - as volume elements, representing a value on a regular 3D grid in space - a realistic and accurate modeling of existing or planned buildings is established

Once, the simulated model of the real architectural or planned world is converted to a continuous raster workspace, the non-simple 3D spatial analysis of built-up areas becomes less complex regardless the number of buildings and their shapes. In contrast to the common approach of a binary visibility decision - where a point can be visible or invisible; the suggested raster approach enables to compute visibility as a continuous figure with in-between values from fully visible up to fully invisible. 

The results of the model’s calculations are presented over several test cases. The results include the measurements of visible space from a single vantage point, an entire floor, as well as comparing two building configurations.