production of digital orthophoto for “geographic information system for mine action”

Production of digital Production of digital orthophoto for orthophoto for “Geographic “Geographic

Information System Information System for Mine Action”for Mine Action”

2nd 2nd WorkshopWorkshop of SEEMACC GIS of SEEMACC GIS GROUP in ITF SloveniaGROUP in ITF Slovenia

M.Sc. Vasja Bric, Geodetski zavod M.Sc. Vasja Bric, Geodetski zavod Slovenije d.d.Slovenije d.d.

V.Bric, GZS d.d. 2nd Workshop of SEEMACC GIS GROUP

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ContentsContents

• project organisationproject organisation• overview of the projectoverview of the project• statistics of the projectstatistics of the project• problems and solutionsproblems and solutions• resultsresults• future improvementsfuture improvements


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Project organisationProject organisation

• Aerial photography of the area (GZS)Aerial photography of the area (GZS)• Planning of ground control points (GZS)Planning of ground control points (GZS)• Marking, measurement, computation Marking, measurement, computation

and transformation of GCPs (BHMAC)and transformation of GCPs (BHMAC)• Orthophoto production (GZS) (scanning, Orthophoto production (GZS) (scanning,

aerialtriangulation, DTM, orthophoto aerialtriangulation, DTM, orthophoto computation, mosaicing, finalisation)computation, mosaicing, finalisation)


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Overview of the projectOverview of the project

• Two areas: Two areas: – Lašva 1:2500 and 1:1000 (same area)Lašva 1:2500 and 1:1000 (same area)– Pelagičevo 1:2500Pelagičevo 1:2500

– Scale of aerial survey:Scale of aerial survey:• map scale 1:2500 - photo scale 1:12500map scale 1:2500 - photo scale 1:12500• map scale 1:1000 - photo scale 1:5000map scale 1:1000 - photo scale 1:5000


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Lašva Lašva 1:25001:2500


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Lašva Lašva 1:10001:1000


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Pelagičevo Pelagičevo 1:25001:2500


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StatisticsStatistics

AreaArea no. of no. of GCPsGCPs

no. of no. of tie tie pointspoints

no. of no. of imagesimages

RMS on RMS on GCPsGCPs

LašvaLašva

1:25001:25003030 11201120 180180 Y 0.08 mY 0.08 m

X 0.08 mX 0.08 m

Z 0.18 mZ 0.18 m

LašvaLašva

1:10001:10004040 562562 157157 Y 0.05 mY 0.05 m

X 0.05 mX 0.05 m

Z 0.10 mZ 0.10 m

PelagičPelagičevoevo

1:25001:2500

3939 886886 274274 Y 0.04 mY 0.04 m

X 0.04 mX 0.04 m

Z 0.03 mZ 0.03 m


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Problems and solutionsProblems and solutions

• marking of GCPsmarking of GCPs• measurements of natural detailmeasurements of natural detail• GCP accuracyGCP accuracy

• GSD (1 pixel on the ground)GSD (1 pixel on the ground)• 1:2500 (2.25x1.5 km) if GSD is 0.10m 1:2500 (2.25x1.5 km) if GSD is 0.10m

338 MB338 MB• 1:1000 (0.75x0.5 km) if GSD is 0.05m 1:1000 (0.75x0.5 km) if GSD is 0.05m

150 MB150 MB


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Natural detail for a Natural detail for a GCPGCP


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ResultsResults

• OrthophotoOrthophoto– Number of sheets: Number of sheets:

• Lašva 1:2500 84 (x 338 MB is 28.4 Lašva 1:2500 84 (x 338 MB is 28.4 GB) GB)

• Lašva 1:1000 128 (x 150 MB is 19.2 Lašva 1:1000 128 (x 150 MB is 19.2 GB)GB)

• Pelagičevo 1:2500 134 (x 338 MB is 45.3 Pelagičevo 1:2500 134 (x 338 MB is 45.3 GB)GB)

• DTM (grid, characteristic lines and DTM (grid, characteristic lines and spot heights)spot heights)


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Orthophoto Lašva Orthophoto Lašva 1:1000 1:1000


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Orthophoto Lašva Orthophoto Lašva 1:10001:1000


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Orthophoto Lašva Orthophoto Lašva 1:10001:1000


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DTMDTM


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Future improvementsFuture improvements

• planning all activities (time of aerial planning all activities (time of aerial survey)survey)

• planning of aero-triangulationplanning of aero-triangulation• marking of GCPs and measurementsmarking of GCPs and measurements• aerial surveyaerial survey• additional field work (missing GCPs)additional field work (missing GCPs)• transformation parameters from transformation parameters from

governmental to WGS84 systemgovernmental to WGS84 system

production of digital orthophoto for “geographic information system for mine action”

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