Production of Production of digital orthophoto digital orthophoto for “Geographic for “Geographic Information System Information System for Mine Action” for Mine Action” 2nd 2nd Workshop Workshop of SEEMACC GIS GROUP of SEEMACC GIS GROUP in ITF Slovenia in ITF Slovenia M.Sc. Vasja Bric, Geodetski M.Sc. Vasja Bric, Geodetski zavod Slovenije d.d. zavod Slovenije d.d.
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Production of digital orthophoto for “Geographic Information System for Mine Action” 2nd Workshop of SEEMACC GIS GROUP in ITF Slovenia M.Sc. Vasja Bric,
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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
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,
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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