Two college students have been hired to map the locations of manhole covers and water meters, etc using kinematic GPS methods. Recording at 5-sec intervals, it is turned on when the students are working so that both can do rover work rather than babysit a nearby base with radio. Ties are made to a control point at the beginning and end of the day. The data are emailed to Gary who post-processes them. The accuracies he obtains are between 1 and 10cm.
Corrections are more likely to be made when the differences are large.
He has found that pre-1974 maps are the least accurate because they were measured with a chain and T16 as opposed to EDM surveys subsequent to 1974. Gary gave us a good picture of the problems involved with trying to ascertain and represent the Right of Way and utilities relative to property lines in Modesto. Marti Ikehara was nominated for Chairman. Mark Murray gave an update on the CORS installations in Northern California. Stations have recently been installed in the Bay Area on Mt. Diablo, Monument Peak near Milpitas, and near the Point Reyes Lighthouse.