Prepare UAS Data using Bentley Context Capture

This page describes Oblique data Bentley *.xml export for Orbit.
Using the corresponding template from 3D Mapping Data Preparation and Import Templates the described resources can be imported into Orbit.

It is strongly recommend to read first Concepts of Mobile Mapping and UAS data in Orbit.

• Image type : Preferably undistorted (corrected distortion and Central Principal Point) planar images.
• File format : Each image is one *.tif file.
• File name : Corresponds to the name in the image positions file, see below.

*.xml Bentley export X-right Y-down Yaw, Pitch, Roll angles
Camera calibration information is included in the Bentley export.

• Value of Coordinates “X;Y;Z” : Any supported coordinate system, decimal notation, without thousands separator.
• Value of Angles “Yaw, Pitch, Roll” : Supported 3D Mapping Resources, degrees.
• File format : One *.xml file (UAS module allows import of one camera only so there should be only one Photogroup in the file)

<?xml version="1.0" encoding="utf-8"?>
<BlocksExchange version="3.2">
	<SpatialReferenceSystems>
		<SRS>
			<Id>0</Id>
			<Name>ECEF</Name>
			<Definition>EPSG:4978</Definition>
		</SRS>
		<SRS>
			<Id>1</Id>
			<Name>WGS 84 / UTM zone 36N (EPSG:32636)</Name>
			<Definition>EPSG:32636</Definition>
		</SRS>
	</SpatialReferenceSystems>
	<Block>
		<Name>Block_9 (Block_5 (Test) - extract)</Name>
		<Description>Imported from &apos;Block_5 (Test) - extract - export.xml&apos;
Extracted from Block_5 (Test)</Description>
		<Type>Aerial</Type>
		<SRSId>1</SRSId>
		<Photogroups>
			<Photogroup>
				<Name>Photogroup 1</Name>
				<ImageDimensions>
					<Width>4864</Width>
					<Height>3232</Height>
				</ImageDimensions>
				<CameraModelType>Perspective</CameraModelType>
				<CameraModelBand>Visible</CameraModelBand>
				<FocalLength>405.922407913922</FocalLength>
				<SensorSize>48.64</SensorSize>
				<CameraOrientation>XRightYDown</CameraOrientation>
				<PrincipalPoint>
					<x>2616.266018429</x>
					<y>1533.8014861345</y>
				</PrincipalPoint>
				<Distortion>
					<K1>-0.173537607271</K1>
					<K2>3.324546755555</K2>
					<K3>0</K3>
					<P1>7.495643e-05</P1>
					<P2>-0.00043507451</P2>
				</Distortion>
				<AspectRatio>1</AspectRatio>
				<Skew>0</Skew>
				<Photo>
					<Id>0</Id>
					<ImagePath>D:\test_path\138246_0.tif</ImagePath>
					<Component>1</Component>
					<Pose>
						<Rotation>
							<Yaw>-98.4491894420675</Yaw>
							<Pitch>-40.2389494372481</Pitch>
							<Roll>-6.90985883718705</Roll>
						</Rotation>
						<Center>
							<x>696154.817953712</x>
							<y>3450233.96581755</y>
							<z>2440.958194023</z>
						</Center>
						<Metadata>
							<SRSId>0</SRSId>
							<Rotation>
								<Yaw>178.488269816683</Yaw>
								<Pitch>-24.7260201589946</Pitch>
								<Roll>62.188024775886</Roll>
							</Rotation>
							<Center>
								<x>4472962.33656</x>
								<y>3138772.69169</y>
								<z>3283270.64096</z>
							</Center>
						</Metadata>
					</Pose>
					<ExifData/>
				</Photo>
				<Photo>
				...
				</Photo>
				...
			</Photogroup>
		</Photogroups>
	</Block>
</BlocksExchange>			

• File format : One or more *.las or *.laz files.
• File structure : Las version 1.2.
• Value of Latitude, Longitude, Elevation : Same CRS as Image Positions.