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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!