Using DSS digital camera images and DТM from ALS50 laser scanner for creating orthomosaics in...
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Transcript of Using DSS digital camera images and DТM from ALS50 laser scanner for creating orthomosaics in...
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)
On-board data + software
Digital aerial imagesExterior orientation parametersDTM from Laser scanner
TerraScan softwarePHOTOMOD software
PHOTOMOD 4.1 – automatic interior orientation of images from the digital camera
PHOTOMOD 4.1 – importing exterior orientation parameters from Applanix format
PHOTOMOD 4.1 – block layout creation fromthe exterior orientation parameters
PHOTOMOD 4.1 – automatic tie points measurements using the block layout
PHOTOMOD 4.1 – import of laser scanner datafrom LAS format
+ 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
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
How does it look like
Calibration of DSS-ALS50 system was done in accordance with standard Applanix technology on the special polygon
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
PHOTOMOD 4.1. One of project strips (35 images)
PHOTOMOD 4.1. Automatic interior orientation
PHOTOMOD 4.1. Block layout after importing Applanix data
PHOTOMOD 4.1. Automatic tie points measurements
PHOTOMOD 4.1. Automatic tie points measurements
PHOTOMOD 4.1. Block adjustment
TerraScan. All points
~8 points / sq.m~720 000 points / image
TerraScan. “Ground” points
~2 points / sq.m~180 000 points / image
TerraScan. “Model key” points
~0.2 points / sq.m~18 000 points / image
PHOTOMOD 4.1
PHOTOMOD 4.1 Laser scanner data
The biggest LAS file imported to PHOTOMOD was about 5 000 000 points
PHOTOMOD 4.1
PHOTOMOD 4.1 DEM from laser scanner data
PHOTOMOD 4.1 DEM from laser scanner data
PHOTOMOD 4.1 Orthomosaic
PHOTOMOD 4.1 Orthomosaic
+ 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
Thank you for attention!