using dss digital camera images and dТm from als50 laser scanner for creating orthomosaics in...
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![Page 1: Using DSS digital camera images and DТM from ALS50 laser scanner for creating orthomosaics in PHOTOMOD system Dmitry V. Кochergin (Racurs), Maxim V. Skorniakov](https://reader035.vdocuments.site/reader035/viewer/2022070416/56649cb65503460f9497b61d/html5/thumbnails/1.jpg)
Using DSS digital camera images and DТM from ALS50 laser scanner for
creating orthomosaics in PHOTOMOD system
Dmitry V. Кochergin (Racurs), Maxim V. Skorniakov (Mosgiprotrans)
![Page 2: Using DSS digital camera images and DТM from ALS50 laser scanner for creating orthomosaics in PHOTOMOD system Dmitry V. Кochergin (Racurs), Maxim V. Skorniakov](https://reader035.vdocuments.site/reader035/viewer/2022070416/56649cb65503460f9497b61d/html5/thumbnails/2.jpg)
On-board data + software
Digital aerial imagesExterior orientation parametersDTM from Laser scanner
TerraScan softwarePHOTOMOD software
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PHOTOMOD 4.1 – automatic interior orientation of images from the digital camera
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PHOTOMOD 4.1 – importing exterior orientation parameters from Applanix format
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PHOTOMOD 4.1 – block layout creation fromthe exterior orientation parameters
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PHOTOMOD 4.1 – automatic tie points measurements using the block layout
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PHOTOMOD 4.1 – import of laser scanner datafrom LAS format
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+ automatic tie points measurements
+ automatic tie points measurements
+ ground control points
Digital aerial images, Exterior orientation parameters, DTM from Laser scanner
Orthomosaics of different accuracy
Input, processing, output
direct georeferencing block adjustment
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reconstruction of existing highways and railroads and projecting new ones
aerial survey: • DSS camera (focal length = 35 mm)• Applanix • ALS 50
• Flight height 300 m• Air vehicle Mi-8 helicopter• Total length 180 кm • Aerial survey productivity 150 km per day• Velocity 120-150 km\h
one of the projects in 2006:
output products:• DEM• Orthomosaics of 1:1000 scale• 3D vector objects
MOSGIPROTRANS Co. is the biggest Russian institute of exploration and projecting of transportation objects
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How does it look like
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Calibration of DSS-ALS50 system was done in accordance with standard Applanix technology on the special polygon
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Project geodetic works
GCPs (also for more precise field survey and calculation of accurate local datum parameters)
Tacheometry
Base stations for ALS and DSS (Applanix postprocessing)
“Moscow” coordinate system
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PHOTOMOD 4.1. One of project strips (35 images)
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PHOTOMOD 4.1. Automatic interior orientation
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PHOTOMOD 4.1. Block layout after importing Applanix data
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PHOTOMOD 4.1. Automatic tie points measurements
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PHOTOMOD 4.1. Automatic tie points measurements
![Page 18: Using DSS digital camera images and DТM from ALS50 laser scanner for creating orthomosaics in PHOTOMOD system Dmitry V. Кochergin (Racurs), Maxim V. Skorniakov](https://reader035.vdocuments.site/reader035/viewer/2022070416/56649cb65503460f9497b61d/html5/thumbnails/18.jpg)
PHOTOMOD 4.1. Block adjustment
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TerraScan. All points
~8 points / sq.m~720 000 points / image
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TerraScan. “Ground” points
~2 points / sq.m~180 000 points / image
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TerraScan. “Model key” points
~0.2 points / sq.m~18 000 points / image
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PHOTOMOD 4.1
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PHOTOMOD 4.1 Laser scanner data
The biggest LAS file imported to PHOTOMOD was about 5 000 000 points
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PHOTOMOD 4.1
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PHOTOMOD 4.1 DEM from laser scanner data
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PHOTOMOD 4.1 DEM from laser scanner data
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PHOTOMOD 4.1 Orthomosaic
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PHOTOMOD 4.1 Orthomosaic
![Page 29: Using DSS digital camera images and DТM from ALS50 laser scanner for creating orthomosaics in PHOTOMOD system Dmitry V. Кochergin (Racurs), Maxim V. Skorniakov](https://reader035.vdocuments.site/reader035/viewer/2022070416/56649cb65503460f9497b61d/html5/thumbnails/29.jpg)
+ automatic tie points measurements
+ automatic tie points measurements
+ ground control points
orthomosaic accuracy by check points (max residual)
30 cm 25 cm 15 cm
Digital aerial images, Exterior orientation parameters, DEM from Laser scanner
Accuracy and productivity
Total time for 35 images project processing is about 10 hours
direct georeferencing block adjustment
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Thank you for attention!