September 11, 2011 § Leave a comment
This post follows on from ARCA posts on Historical Maps, Web delivery, and collecting your own data.
To review; historical maps are historical documents, they can be systematically geo-registered, and analysed and derived with GIS. Web delivery involves handling large raster images via Tiles or Wavelet Compression, and handling Vector Data with KML and GIS as an authoring tool. Own data can be collected via databases, digital vector data sources, map digitisation, aerial photographs, remote sensing geophysical methods and digital survey methods. These also include Global Navigation Satellite Systems, Total Station (scalable), Field Survey and recording, surface collection, excavation and artefacts.
GPS is completely passive and continuous, receiving data every few seconds. Performs trilateration, using Distance through time (nothing to do with angles).
Looking at the Case Study: Chile Inca Roads, a network of roads dating back to 14-1500 AD which served to hold the empire together, were being commonly nominated for World Heritage. GPS tracking (with times synchronised from photos to GPS), allowed later geo-referencing and 3D modelling.
The Pilbara Project (looked at a series of Pastoral areas, areas’ who’s settlement relied on Indigenous labour, included the Inthanoona site). GIS and Differential Global Positional Systems ( where a stationary reciever was set up as background GPS to which all other handheld GPS’ were synchronised with ) were used. GPS could also document the movement of the crew’s tracks. Digital Photography was used for quick documentation, analysis, having the benefits of zoom and geotagging. Pro-Forma Recording Sheets were also used.
The Case Study of the Total Station Survey Krol Romeas, Angkor, used total station to map the area, and then virtually remodel it’s past form, allowing for hypothesis’ and testing of it’s uses.