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PIM Tool Instructional Video: Getting Started with the Orthophoto Tool

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By Ali Lenjani1, Chul Min Yeum1, Shirley J. Dyke1

Purdue University

This instructional video is an outcome of JTRP Project SPR-4006, which focuses on the development of a Pay Item Measurement (PIM) Toolkit.

Version 1.0 - published on 13 Nov 2017 doi:10.4231/R7TT4P4Z - cite this Archived on 14 Dec 2017

Licensed under Attribution 3.0 Unported


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 Orthophoto Generation Tool are included in Chapter 5.3 of the technical report Image-Based Collection and Measurements for Construction Pay Items, available for download at https://doi.org/10.5703/1288284316510.

This instructional video illustrates how to run the Orthophoto Generation Tool to create a high-quality orthophoto. PIM is intended to generate orthophotos for measurements on a planar surface and subsequently take measurements of pay items from the orthophoto generated. 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. Associated user guidelines explain the process of how to collect suitable high-quality images, which is a critical step for successful orthophoto construction. 

More information on how to use the resulting orthophoto is available in a companion video publication, PIM Tool Instructional Video: Getting Started with the Graphical Measurement Tool (https://doi.org/10.4231/R7ZK5DV8).

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