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dc.contributor.authorBowman, M Hamishen_NZ
dc.date.available2011-04-07T03:03:08Z
dc.date.copyright2007-12-06en_NZ
dc.identifier.citationBowman, M. H. (2007, December 6). Two new tools for aggregation and geoprocessing of raw spatial data. Presented at the 19th Annual Colloquium of the Spatial Information Research Centre (SIRC 2007: Does Space Matter?).en
dc.identifier.urihttp://hdl.handle.net/10523/802
dc.descriptionOnly the abstract was published in the proceedings. There is no full text.en_NZ
dc.description.abstractThe journey to successful data analysis is vulnerable to loss of accuracy at several key steps in its progression. Thus the ease of understanding the results and strength of insight into a work’s implications depends on special care being taken at all opportunities. If a dataset is too large for a computer software system to handle, data and resolution will need to be sacrificed in the name of practicality. If the tools to process the data do not exist, then only a crude superficial analysis can ever be conducted. In this paper I present two new data import tools written for the Free and Open Source GRASS GIS software. The first module, r.in.xyz, has been designed for processing massive point cloud datasets, for example raw LIDAR or multibeam sonar swath data. Data is binned into a raster map using a variety of univariate statistical methods. The module has proven to be extremely fast, even when faced with datasets of many dozens of gigabytes. Data may be fed directly into the program from the output source and there is no known limit to the number of input points. The second module, i.warp, was designed to convert twisted analogue imagery into a highly spatially accurate raster GIS layer with minimal loss of information using thin plate spline warping. Raw sea floor imagery printed to paper rolls on a historic sidescan sonar survey was successful resurrected into a useful map of nearshore reefs. The workflow takes advantage of the existing GIS user interfaces for applying ground control points and the module is run as a slot-in replacement for the standard 2nd and 3rd order georectification modules. Examples for both modules are given for studies undertaken in the waters off the Otago coast.en_NZ
dc.format.mimetypeapplication/pdf
dc.relation.urihttp://www.business.otago.ac.nz/sirc/conferences/2007/07_bowman.pdfen_NZ
dc.subjectGISen_NZ
dc.subjectgeospatial processingen_NZ
dc.subjectdata aggregationen_NZ
dc.subjectthin plate splineen_NZ
dc.subjectimage warpen_NZ
dc.subjectLIDARen_NZ
dc.subjectmultibeam sonaren_NZ
dc.subjectsidescan sonaren_NZ
dc.subject.lcshQA76 Computer softwareen_NZ
dc.titleTwo new tools for aggregation and geoprocessing of raw spatial dataen_NZ
dc.typeConference or Workshop Item (Oral presentation)en_NZ
dc.description.versionPublisheden_NZ
otago.date.accession2009-04-20 20:25:28en_NZ
otago.relation.pages33en_NZ
otago.openaccessOpen
dc.identifier.eprints806en_NZ
dc.description.refereedNon Peer Revieweden_NZ
otago.school.eprintsSpatial Information Research Centreen_NZ
otago.school.eprintsMarine Scienceen_NZ
dc.description.referencesBowman, M.H. (2005). “A numerical wave exposure model for Nugget Point and the Catlins Coast.” Report to the Department of Conservation Otago Conservancy, New Zealand, 15 pp. Knight, P. (2005). “Geo-referencing and plotting side-scan information.” Report to the Department of Conservation Otago Conservancy, New Zealand by Geomatics NZ Ltd., 2 pp. Mitasova, H., Overton, M.F., Recalde, J.J., Bernstein, D.J., & Freeman, C.W. (2007). “Raster-based Analysis of Coastal Terrain Dynamics from Multitemporal Lidar Data.” Submitted to Journal of Coastal Research as a technical communication, November 2007.en_NZ
otago.event.dates6-7 Decemberen_NZ
otago.event.placeDunedin, New Zealanden_NZ
otago.event.typeconferenceen_NZ
otago.event.title19th Annual Colloquium of the Spatial Information Research Centre (SIRC 2007: Does Space Matter?)en_NZ
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