# Influence of Renders Surface Structure and Color Properties in the Context of the TLS Accuracy

## TL;DR

This paper investigates how the surface structure and color of renders affect the accuracy of terrestrial laser scanning measurements.

## Contribution

The study reveals that render type and brightness influence TLS measurement accuracy and dispersion.

## Key findings

- Scratched-type render causes a greater standard deviation in TLS measurements than Roughcast-type render.
- Measurement dispersion increases as render brightness decreases.

## Abstract

This paper presents the results of laboratory studies on the impact of the type, color, and brightness of render on the accuracy of measurements performed using the terrestrial laser scanning (TLS). Analyses were conducted for decorative renders of the “Roughcast” and “Scratched” types, with average brightness ranging from 143 to 243. It was found that the standard deviation of the mean distance for “Scratched” renders is approximately 26% higher than for “Roughcast” renders. The results indicate increased dispersion of measurement results as render brightness decreases. Within the analyzed range, it was observed that the blue color has the least impact on the TLS measurement results.

What are the main findings?
Scratched-type render causes a greater standard deviation in TLS measurements than the Roughcast-type one.As the brightness of the renders decreases, the dispersion of the statistical parameters of the TLS measurements increases.

Scratched-type render causes a greater standard deviation in TLS measurements than the Roughcast-type one.

As the brightness of the renders decreases, the dispersion of the statistical parameters of the TLS measurements increases.

What is the implication of the main finding?
Depending on the render structure of the measured object, different TLS measurement accuracies are obtained.The darker the render color on the object, the greater the dispersion of the TLS measurement results.

Depending on the render structure of the measured object, different TLS measurement accuracies are obtained.

The darker the render color on the object, the greater the dispersion of the TLS measurement results.

This paper presents the results of laboratory research regarding the influence of the structure and color of decorative renders on the accuracy of measurements conducted using Leica ScanStation P40 terrestrial laser scanning (TLS). The study examined whether and how differences in render structure and color (brightness) affect the quality of data acquired via TLS. The color and brightness measurements of the test fields were performed using a flatbed scanner. The RGB color and luminance analysis of the test fields were conducted using the software “ImageJ” version 1.54g. The measurements were conducted for light-colored renders (average brightness from 143 to 243). The research found no clear relationship established between the type and color of render and the accuracy of laser scanning. The results indicate increased measurement dispersion with decreasing render brightness. It was found that the standard deviation of distance measurements for Scratched-type renders is approximately 26% higher than for Roughcast-type render.