Ruijin Ma, Ph.D.
Mark P. Kumler, Ph.D.
Boundaries of land have been documented and recorded throughout history dating back over 2000 years ago. Land has been an important commodity throughout time, and a move toward building a coordinate-based land cadastre has been implemented in other countries across the world. It is used in parts of Europe, British Columbia, and the Middle East to manage land records. The County of Riverside needed a process for checking and reporting surveyed land divisions that were submitted in the form of computer aided design (CAD) files, and loading them into a geographic information system (GIS). The current CAD data submitted had errors with the geometry, and in most cases did not have a projected coordinate system. Most of the CAD files were not used for their intended purpose: which was to be shared with the Riverside County Assessor’s staff to aid them in creating and updating their Assessor Parcel Layer. Without the digital data the Assessor’s staff followed its business practice of re-entering the parcels one at a time. This created redundancy of work since the same data supplied by the Land Surveyor or Civil Engineer was identical. Some of the problems listed above uncovered the need to come up with a digital submission standard, and an automation tool to help prepare the data for loading into the Parcel Fabric. The goal of the project was to create a tool that will automatically check the surveyed land division for compliance prior to approval; this tool is named County Automated Terrestrial CAD Helper (CATCH). CATCH uses GIS technology to automatically identify mapping errors and report these errors back to the Land Surveyor or Civil Engineer who created the data. CATCH has been well received by the professional engineering community, from a series of stakeholder meetings held at county offices to introduce the project to private industry professionals and county staff. These meetings were critical in the success of CATCH, and helped bring up issues that the industry have had in submitting their digital files in the past. Also, CATCH could be well suited as the platform for tracking and maintaining other county assets in a GIS such as: grading plans, storm drains, gas lines, and other critical utilities that come in the form of digital CAD files. The problem that was solved was having an accurate foundation: and that being the boundary survey tied to a CAD file that utilized global navigation satellite system (GNSS) and global positioning system (GPS) technology.
McMillan, D. L. (2015). Creating an Automation Tool for Checking Data Integrity of CAD Files (Master's thesis, University of Redlands). Retrieved from https://inspire.redlands.edu/gis_gradproj/237