Over the years, SRI has utilized several methods of producing accurate yet inexpensive landbase maps. In the past, SRI found ways of combining existing accurate source materials together with newly flown aerial photography to produce accurate landbase maps. 7.5' quadrangle data as a means of displaying additional geographic map features.
Roads are the predominant feature on any map and most often where utilities build their lines.
Therefore all roads in a utility service area are driven in a precise and orderly manner. Roads are not only mapped, but also have attribute data attached to them. Each road and road intersection is meticulously edited for quality control by experienced digitizers. Road centerlines captured with GPS are then offset on both sides to allow for a specified road width. The utility would then have a complete GPS accurate road background, with the ability to add any GPS feature and rely on its position in relation to the road.