Accurate and safe measurement of actual pay items placed is a critical step in the timely completion of a construction project. Currently this is an entirely manual process, with substantial risk to personnel as well as for human error. Thus, the ability to remove personnel from this hazardous environment and to reduce the chance for error is desirable. Image-based technology offers an opportunity to do both.
The Pay Item Measurement (PIM) tool package is provided as two complementary tools—the Orthophoto Generation Tool and the Graphical Measurement Tool—and was developed in close cooperation with field engineers from INDOT. PIM is specifically designed to incorporate the typical actions that field personnel follow during a construction project and enables a safer and reliable approach to such measurements. Measurements of construction pay items are automatically logged and recorded, and files may be stored directly. Written instructions on the use of the Graphical Measurement Tool are included in Chapter 5.4 of the technical report Image-Based Collection and Measurements for Construction Pay Items, available for download at https://doi.org/10.5703/1288284316510.
This video illustrates how to make construction pay item measurements using our Graphical Measurement Tool. PIM is intended to generate an orthophoto of a planar surface and take measurements of construction pay items from that orthophoto. With this tool, one can readily compute distances, perimeters, and areas from a construction site for documenting and recording. User guidelines (demonstrated in this video) explain the process of how to collect suitable high-quality images, which is a critical step for successful orthophoto construction. This customized tool package will be most useful, and accurate, when the user guidelines are followed. Several examples are included in the technical report Image-Based Collection and Measurements for Construction Pay Items that demonstrate the characteristics of high-quality image sets that will be successful, as well as image sets that will not.
More information on how to generate the resulting orthophoto is available in a companion video publication, PIM Tool Instructional Video: Getting Started with the Orthophoto Tool (https://doi.org/10.4231/R7TT4P4Z).
Cite this work
Researchers should cite this work as follows:
- Lenjani, A., Yeum, C. M., Dyke, S. J. (2017). PIM Tool Instructional Video: Getting Started with the Graphical Measurement Tool. Purdue University Research Repository. doi:10.4231/R7ZK5DV8