Limestone building facades: A proposal for soiling inspection method by photogrammetry
Description
The research hypothesizes that limestone facade soiling can be quantitatively assessed through photogrammetry. To support this, architectural drawings in the DWG file were utilized as the background of this work. The methodology involved processing raw photographs into standardized "base facade images" – perspective corrected, gray-scaled, grey-equalized, resized to match the dimensions from the drawing files, and cleaned to eliminate all unrelated elements. These base facade images are created in the PSB files of elevations. Extracted PNG base facade images of all facade parts are stored in the "Base Facade Images" file. The accompanying "Calculation_of_soiling" file details the quantitative results obtained by applying the described photogrammetry method (specifically pixel counting on these base images) to the Kuledibi Treasury Building.
Files
Steps to reproduce
1) Case building elevation drawings are prepared. 2) Facade photos are obtained. 3) All photos are gray-scaled and grey-equalized. 4) All photos are perspective corrected. 5) Elevation drawings printed and opened in Photoshop. 6) All processed facade images are sized and cropped to fit their place on elevation drawings opened in Photoshop. 7) All facade part images, which are designated as base facade images from this step on, are saved in PNG format separately. 8) Base facade images are opened, and pixels are separated into different layers according to the RGB value. 9) Pixels of all layers are counted and entered into the Calculation_of_soiling file.
Institutions
- Istanbul Teknik Universitesi