Limestone building facades: A proposal for soiling inspection method by photogrammetry

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.