This document summarizes research on using remote sensing techniques like photography and image analysis to categorize and analyze surface deterioration on structures. Researchers took photos of a constructed concrete block wall with introduced cracks and biological crusts from varying distances and magnifications. The images were analyzed using ERDAS Imagine software to classify deteriorations. The number of pixels for each deterioration type at different distances/magnifications was recorded. Regression analysis using the least squares and bilinear quadratic methods generated equations to analyze the relationship between deterioration and distance/magnification for condition assessment of inaccessible structures. The percentage difference between the measured and calculated deterioration values was within an acceptable range.