Using DSS digital camera images and DТM from

Using DSS digital camera images and DТM from ALS 50 laser scanner for creating orthomosaics in PHOTOMOD system Dmitry V. Кochergin (Racurs), Maxim V. Skorniakov (Mosgiprotrans)

On-board data + software Digital aerial images Exterior orientation parameters DTM from Laser scanner Terra. Scan software PHOTOMOD 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 from the exterior orientation parameters

PHOTOMOD 4. 1 – automatic tie points measurements using the block layout

PHOTOMOD 4. 1 – import of laser scanner data from LAS format

Input, processing, output Digital aerial images, Exterior orientation parameters, DTM from Laser scanner direct georeferencing block adjustment + automatic tie points measurements + ground control points Orthomosaics of different accuracy

MOSGIPROTRANS Co. is the biggest Russian institute of exploration and projecting of transportation objects one of the projects in 2006: reconstruction of existing highways and railroads and projecting new ones aerial survey: • DSS camera (focal length = 35 mm) • Applanix • ALS 50 • Flight height • Air vehicle • Total length • Aerial survey productivity • Velocity 300 m Mi-8 helicopter 180 кm 150 km per day 120 -150 kmh output products: • DEM • Orthomosaics of 1: 1000 scale • 3 D vector objects

How does it look like

Calibration of DSS-ALS 50 system was done in accordance with standard Applanix technology on the special polygon

Project geodetic works “Moscow” coordinate system üGCPs (also for more precise field survey and calculation of accurate local datum parameters) üTacheometry üBase stations for ALS and DSS (Applanix postprocessing)

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

Terra. Scan. All points ~8 points / sq. m ~720 000 points / image

Terra. Scan. “Ground” points ~2 points / sq. m ~180 000 points / image

Terra. Scan. “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 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

Accuracy and productivity Digital aerial images, Exterior orientation parameters, DEM from Laser scanner direct georeferencing block adjustment + automatic tie points measurements + ground control points orthomosaic accuracy by check points (max residual) 30 cm 25 cm 15 cm v Total time for 35 images project processing is about 10 hours

Thank you for attention!