Abstract
View PresentationLow-Distortion Map Projections for Surveying and GIS
Track: Geodetics 1
Author(s): Michael Dennis
Direct utilization of electronic survey data in GIS is driving a growing awareness of issues related to georeferencing and map projection distortion. In particular, survey data are often intended to represent conditions "at ground," such that distances based on map coordinates equal "true" distances on the ground. But such low-distortion survey coordinate systems are usually not consistent with those used for GIS and, in many cases, are not well defined. This presentation will demonstrate methods for seamlessly including survey data in a GIS, regardless of the coordinate system used. This will include explanation of map projection distortion, detailed instructions on optimal design of low-distortion projections for survey data, defining coordinate systems for data transferability, and the important issue of documentation (metadata). The overarching goal is to demonstrate that survey and GIS data can coexist without either dataset being degraded and without resorting to approximate "rubber-sheeting" acts of desperation.
Michael L. Dennis
8775 S Cluff Ranch Road
Pima, Arizona 85543
US
Phone: 928-322-0956
E-mail: mld@geodeticanalysis.com