9D Lightning Contours

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Generating ContoursGenerating Contoursrom a arom a a

Marvin H. TreuMarvin H. Treu

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twotwo--foot interval contours across Sarpyfoot interval contours across Sarpy,,

The final product is planned as a submissionThe final product is planned as a submission


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Orthophotography Consortium (NIROC)Orthophotography Consortium (NIROC)

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resolution data for planning, design,resolution data for planning, design,

Collected by Merrick & Co.Collected by Merrick & Co. April 2010April 2010

GSD: 1.36 meters (4.46 feet)GSD: 1.36 meters (4.46 feet) RMSEz: meet/exceed 0.3 feetRMSEz: meet/exceed 0.3 feet


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Diagrams from ASPRS as cited in: Schuckman, Karen. 2011. GEOG 497D: LIDARTechnology and Applications. Penn State John A. Dutton e-Education Institute.


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Tool processing a geodatabase terrainTool processing a geodatabase terrain

processing of LAS binary file format LiDARprocessing of LAS binary file format LiDAR

ArcGIS 10 processing of MerrickArcGIS 10 processing of Merrick--generatedgenerated

g a erra n o e es us ngg a erra n o e es us ngContour Harvester python scriptContour Harvester python script


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not bound by breaklines which contributesnot bound by breaklines which contributesto fre uent anomaliesto fre uent anomalies

Point File Information ToolPoint File Information Tool

Valuable statistical information about the LiDARValuable statistical information about the LiDARdata fielddata field

Useful for quality controlUseful for quality control

Quickest method of the three for contourQuickest method of the three for contourgenerationgeneration


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Smoother contours than method 1Smoother contours than method 1

Respects breakline boundariesRespects breakline boundariesCan ad ust man arameters amount ofCan ad ust man arameters amount of

smoothing, min. contour length)smoothing, min. contour length)

Can edit point cloud (maintain original files)Can edit point cloud (maintain original files)EdgeEdge--tying of contours required in posttying of contours required in post--

processingprocessing

ompu er processor n ens ve; an e a orompu er processor n ens ve; an e a orintensiveintensive ,,

excellent resultsexcellent results


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but at the expense of some accuracybut at the expense of some accuracy--

Contours respect breaklines builtContours respect breaklines built--in to DTMin to DTMt est es

Contour script takes hours to run, butContour script takes hours to run, but

produces excellent resultsproduces excellent results


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PPerform a terrainerform a terrain--toto--raster conversionraster conversion

Contouring a large area? WantContouring a large area? Want

ESRIs Contour Harvester scriptESRIs Contour Harvester script

ng neer ng prec s on requ reng neer ng prec s on requ re seseMerricksMerricks MARSMARS softwaresoftware

Note: Based on preliminary, qualitative analysis on a single datasetNote: Based on preliminary, qualitative analysis on a single dataset


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9D Lightning Contours

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