In the Arboretum with the total station and other milestones

November 30th, 2012 by Tech Librarian, Tracy Mehlin

The Leica Builder theodolite is a central part of the total station.

In August 2012 UWBG was awarded a grant from the Institute of Museum and Library Services to create a georeference database of the living collections. The first phase involves surveying in the Washington Park Arboretum.

Where are the monuments?

On a sunny autumn day a team of UW students, UWBG staff and team leader Jim Lutz headed down the East Arboretum trail to the Meadow with a shiny, new total station. They were on a mission to track down monuments that define the grid used to map Arboretum plant accessions. Once a monument was found they used the total station to determine the location in real space. (more photos below)

Total what?

A total station is a collection of equipment, such as a Leica Builder theodolite, tribrach, tripods, and prisms, that is used to measure distance and slope. A team of two or three people use it together to measure coordinates. Most of us have seen a total station in use by transportation survey crews. Low tech equipment like measuring tapes and marking paint are also used to do the job.

Making progress: georeferenced database project milestones

After months of preparation the  Otis Douglas Hyde Herbarium records are now integrated into the BG-Base plant records database which means that a search now returns records for both plant accessions and vouchers. Vouchers are pressed plant material that serve to document and archive living collections while also supporting species identification.

Another milestone completed was scanning the print copies of grid squares. These print maps record where individual trees and shrubs grow with a dot and accession ID number. As plants are added, moved or removed the print maps are redrawn with updated information. As grid corner monuments are surveyed the corresponding scanned map will then be imported as a layer into ArcGIS Desktop and each plant accession will be clicked to essentially digitize the print map.

This is a portion of grid 35-2E. The scanned maps will be digitized the information incorporated into the georeferenced database.

The green dots represent the monuments recently surveyed and entered into an ArcGIS Map project with layers of city streets, park trails, an aerial view and the Arboretum grid map.

November 10th day in the field photos

 


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