GPS to LRM: Integration of Spatial Point Features with Linear Referencing Methods, 2001

Global positioning systems (GPS) offer a cost-effective and efficient method to input and update transportation data. The spatial location of objects provided by GPS is easily integrated into geographic information systems (GIS). The storage, manipulation, and analysis of spatial data are also relatively simple in a GIS. However, many data storage and reporting methods at transportation agencies rely on linear referencing methods (LRMs); consequently, GPS data must be able to link with linear referencing. Unfortunately, the two systems are fundamentally incompatible in the way data are collected, integrated, and manipulated. In order for the spatial data collected using GPS to be integrated into a linear referencing system or shared among LRMs, a number of issues need to be addressed. This report documents and evaluates several of those issues and offers recommendations. In order to evaluate the issues associated with integrating GPS data with a LRM, a pilot study was created. To perform the pilot study, point features, a linear datum, and a spatial representation of a LRM were created for six test roadway segments that were located within the boundaries of the pilot study conducted by the Iowa Department of Transportation linear referencing system project team. Various issues in integrating point features with a LRM or between LRMs are discussed and recommendations provided. The accuracy of the GPS is discussed, including issues such as point features mapping to the wrong segment. Another topic is the loss of spatial information that occurs when a three-dimensional or two-dimensional spatial point feature is converted to a one-dimensional representation on a LRM. Recommendations such as storing point features as spatial objects if necessary or preserving information such as coordinates and elevation are suggested. The lack of spatial accuracy characteristic of most cartography, on which LRM are often based, is another topic discussed. The associated issues include linear and horizontal offset error. The final topic discussed is some of the issues in transferring point feature data between LRMs.

Automated Collection of Sign Inventory Information by Integrating Global Positioning System (GPS) with Videologging Data Collection Activities, 1995

Advances in communication, navigation and imaging technologies are expected to fundamentally change methods currently used to collect data. Electronic data interchange strategies will also minimize data handling and automatically update files at the point of capture. This report summarizes the outcome of using a multi-camera platform as a method to collect roadway inventory data. It defines basic system requirements as expressed by users, who applied these techniques and examines how the application of the technology met those needs. A sign inventory case study was used to determine the advantages of creating and maintaining the database and provides the capability to monitor performance criteria for a Safety Management System. The project identified at least 75 percent of the data elements needed for a sign inventory can be gathered by viewing a high resolution image.

City of Center Point, June 30, 2002

City Audit Report

City of Center Point, Independent Auditor's Reports, Basic Financial Statements and Supplementary Information, Schedule of Findings, June 30, 2004

City Audit Report

City of Strawberry Point, June 30, 2003

City Audit Report

Report on Special Investigation of the Central Point Coordination for Calhoun and Pocahontas Counties for the Period July 1, 1998 through May 31, 2004

Report on a Special Investigation of the Central Point Coordination for Calhoun and Pocahontas Counties.

City of Center Point, Independent Auditor's Reports, Financial Statements and Supplemental Information, Schedule of Findings, June 30, 2003

City Audit Report

City of Center Point, Independent Auditor's Reports, Basic Financial Statements and Supplementary Information, Schedule of Findings, June 30, 2005

City Audit Report

Audit report on the City of Center Point, Iowa for the year ended June 30, 2006.

Audit report on the City of Center Point, Iowa for the year ended June 30, 2006.

Audit report on the City of Strawberry Point, Iowa for the year ended June 30, 2006

Audit report on the City of Strawberry Point, Iowa for the year ended June 30, 2006

Audit report on the City of Center Point, Iowa for the year ended June 30, 2007

Audit report on the City of Center Point, Iowa for the year ended June 30, 2007

Audit report on the City of Strawberry Point, Iowa for the year ended June 30, 2007

Audit report on the City of Strawberry Point, Iowa for the year ended June 30, 2007

Special investigation of the City of Center Point Library for the period January 1, 2006 through December 6, 2007

Special investigation of the City of Center Point Library for the period January 1, 2006 through December 6, 2007

Audit report on the City of Center Point, Iowa for the year ended June 30, 2008

Audit report on the City of Center Point, Iowa for the year ended June 30, 2008

The OCBI Tipping Point, July 10, 2007, Vol. 1

This is the weekly e-Newsletter called “The OCBI Tipping Point.” We hope that you find it very informative as we explore all possibilities to keep our constituency and the general public informed about all matters that affect Blacks in the state of Iowa.