Modelling Prague Castle with UAS

Prague Castle

Prague Castle

Most important Czech castle standing above Vltava river in the

center of Prague city

From 9th century seat of Czech princes and later kings, from 1918

is the residence of the president

Castle with dimensions about 600 meters length and 130 meter

width is one of the largest castles in the world (Guiness Book of

Records)

St. Vitus Cathedral inside the castle is traditional place of coronation

of Czech kings and their final resting place

Prague castle area is non-fly zone in Prague

Make up-to-date mapping before reconstructions

Create ortophotomap in high resolution

Presence during monitoring and mapping

Result = use UAV

Low cost mapping

Production of marketing outputs (video, aerial virtual travel)

Project Specifications

Field observation

Obtaining permission from Czech CAA

Obtaining permission from the Prague Castle

Administration and Office of the President of the Republic

Identification and measuring ground control points

Identification of sites for take-off and landing

Making flight plans

Preparation

Mikrokopter Hexa

Support for flight plans

Battery life up to 20 minutes per flight

Usage of 2 gimbal (servo and bruhless )

Possibility of take-off and landing of the hand

The calibrated camera Canon 700D and

Panasonic GH4

UAV

Flight plans

Flight plans

1 2

3 4 5

• Specifying the video output resolution of mapping

• Due to the high tower at St. Vitus (higher than

100 meters) was chosen

flight altitude150 m

= corresponds to the image

resolution 2,4 cm/pixel

• Overlap between aerial images

was 80/60 percent

(high buildings)

• Calibrated camera Canon EOS 700D

with 28 mm lens

Flying

• Flying in the early hours at the end of March

• Choise of Flight day when the president is outside the Prague Castle

• Selecting the Flight day with clear and calm weather

• The castle guards were present with the pilot and UAV operator during the flights

• High security arrangements

• Total 4 take-off position for direct line of sight to the UAV pilot

• Mapping takes totally 2 hours

• In addition to mapping was created video of the areal and aerial virtual tour

FLYING

Processing

3D model with preview aerial images

• Computing in Agisoft Photoscan Pro

• 3 days computing in ultra high mode, position error about 3 cm

• Main outputs – orthophotomap, digital surface model (point cloud) and 3D model

OUTPUTS – ACTUAL ORTHOPHOTOMAP

• Track record USING FOR TECHNICAL MAP UPDATE AND FOR MONITORING

Outputs

ORTHOPHOTOMAP in high image resolution 2,4 cm/px

• Detailed layers of technical map – pasportization of the pavement

• Digital maps of roofs

• Pasportization of roads and greenery

OUTPUTS - DIGITAL SURFACE MODEL

• Triangulated grid, wireframe model of buildings

• Analysis – visibility, range of the greenery, roofs, project documentation

• 3D model

SPHERICAL PANORAMA – AERIAL VIRTUAL TRAVEL

Creating aerial video above the area

of Prague Castle from several positions

Creating aerial virtual tour and

5 spherical panorama from UAV

Creation of aerial spherical panorama

of the areal in the little planet projection

Each spherical panorama is located

in coordinates including height and

is part of the GIS

Outputs can be used as the tour from

above for the tourists

MAPPING IN NUMBERS

• Mapped almost 1 km² area

• 1 UAV

• 5 flights

• 2 hours flying

• 11 ground control points

• 1595 images

• 400 milion placed points in coordinates (point

cloud)

• 2 cameras with 3 lenses

• 2,4 cm/pixel image resolution

• Almost 100 gb unique geographic data

• Using in Prague Castle GIS and for marketing

purposes Prague castle

E-mail: jakub.karas@upvision.cz

Mob.: +420 601 373 937

Jakub KARAS Upvision co-owner

Director in Czech Unmanned Aerial Alliance

www.upvision.cz

book Drones in Czech language

Thank you

http://www.maia-uav.com