We now have a new date for the Direct Survey Measurement course taught by David Thompson which was postponed earlier this year... It will be Sunday, July 29th, and at this time we plan to hold it at the Maritime Museum. David has offered to give the DSM course in the morning, and in the afternoon, give a course on photomosaicing. If there is interest, we can do that. I recommend everyone be prepared to pay $25 per course. Please email me at
Description of the Direct Survey Measurement course is below:
An Introduction to Three-Dimensional Computer-Based Survey/Direct Survey Measurement (DSM)
You know how to make a two-dimensional site plan. Now why not take your trilateration measurements to a new level? On three-dimensional sites, where trilateration has to be supplemented by plumb lines or other means of measuring depth, DSM is faster and more accurate method.
DSM was developed to provide a simple, rapid, and accurate technique with quantifiable error, for surveying underwater sites, especially those with limited visibility and extremely complex three-dimensional architecture. It is very accurate, easy to use, and is the most accurate method of using a tape measure.
Photomosaic is the process of taking a series of pictures of a site, and then stitching them together to create an overall picture of the site. It is a very useful tool and not easily done. David will be able to provide some valuable pointers of the process.
-Dean Nolan