Indoor Mapping for 3D GIS using ZEB1 Laser Scanner · Indoor Mapping for 3D GIS using ZEB1 Laser...
Transcript of Indoor Mapping for 3D GIS using ZEB1 Laser Scanner · Indoor Mapping for 3D GIS using ZEB1 Laser...
Indoor Mapping for 3D GIS using ZEB1 Laser Scanner
By: Bishoy Gerges
Rainer Kettemann
22.07.2015
Hochschule für Technik Stuttgart
Introduction and Background
ZEB1 Laser Scanner
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Limitations
• No absolute positioning • No intensity measurements • Low accuracy • Large data sets
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Hardware Limitations
• No direct georeferencing • Difficult to identify objects and features • Harder to register multiple scans • Less reliable data • Limited to certain applications
• Longer processing time in non specialized software
• Less efficient workflow
Integration in GIS
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• Use laser scanned data directly in ArcGIS • Save time and effort • One environment for everything
1- Georeferencing Solution
• Large point clouds • Speed • Transformation • Residuals for quality and accuracy assessment • User friendly
Solutions and Objectives
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2-Layers Extraction • Extract floors, ceilings and walls • Create vector polygons • Store height information for each polygon • 3D Visualization
Workflow
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Acquire data Apply transformation
Georeference/ Register
Extract Layers Create Polygons
Point Clouds
Vector data GeoDatabase / Point Cloud
Solution
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*.LASzip
1- Data Acquisition - Capturing data using the scanner
- Measuring locations for georeferencing
Solution
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2- Georeferencing
Local Global measured in UTM ETRS89 Zone 32
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Solution
2- Georeferencing
The georeferenced cloud projected in ArcGIS with Buildings in the HFT area
Points Count: 1.25 Million Processing time: 5 Seconds
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Solution
Residuals:
Point X (in mm) Y (in mm)
1 0.0 2.1
2 0.3 18.5
3 -0.8 -51.1
4 0.4 30.3
Original Corrected
4
3
2
1
Residuals Vector
2- Georeferencing
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3- Layers Extraction
69 m
m
81 m
m
Sphe
re C
ente
r as
extr
acte
d
Floo
r
. . Cei
ling
Floo
r
Wal
ls
Solution
Provide these measurements as input + thickness of each layer
-Floor -Ceiling -Walls slice
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3- Layers Extraction
Solution
Floor Walls slice Ceiling
Processing time: 5 Seconds
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4- Polygons creation
Solution
Aggregate
Erase
Aggregate
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4- Polygons creation
Solution
Multipart to
Singlepart
Spatial Join with
ceiling points
Extrude in ArcScene
Refining/ Cleaning
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User Interface
Solution
Layer Extraction
Polygon Creation
Georeferencing/ Registration
- Optional input for Georeferencing
- Optional Point Feature Class creation
- Optional usage of ceiling points
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Visualization
1-Polygons of rooms and hallways
5.73m
Real= 5.68m
Total Processing time: 28 Seconds Capturing time: Around 9 Minutes Height
in meters
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Visualization
2-Extruded polygons in ArcScene
Height in meters
• ZEB1 is an easy to use equipment. • Quick solution for indoor mapping with a 3cm uncertainty. • Point clouds are processed in the cloud first. • Georeferencing and layers extraction are achieved totally in ArcGIS. • Easy to use interface with full control on every step.
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Summary
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Thank You!