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Lidar + Building Footprints = Building Heights
Maximizing the value of open source data in New Brunswick
Kevin Jones
March 2019
Problem Statement
• Province of NB is leading the way in
publishing open data (LIDAR)
• Building footprints are available for
cities
– Building heights are not included in
attributes
• Can these two datasets be combined
to produce valuable attribute
information?
2
http://www.snb.ca/geon
b1/e/dc/catalogue-
E.asp
http://catalogue-
saintjohn.opendata.arcgis.co
m/datasets/34b6e31364f442
f883035946b7d2c9a5_0
IS IT POSSIBLE?
3
But how?
Download
GeoNB Lidar
Data
Interpolate
point cloud to
DSM
Filter DSM to
DTM
DSM – DTM
= Height Map
4
Download
building
footprints
Attribute
building
footprints
with H Map
Classify /
Represent
building
Produce Map
LiDAR Data processing
5http://geonb.snb.ca/downloads2/lidar/2014/erd/laz/nb_2014_2534000_7363000.laz
DL single
Lidar tile over
downtown
Saint John,
NB
Detailed Steps – Point Cloud to DSM/DTM
6
Import
Downloaded
LAZ file
Detailed Steps – Point Cloud to DSM/DTM
7
Specify
Projection
and elevation
units
Detailed Steps – Point Cloud to DSM/DTM
8
Specify
resolution
and desired
field name
Detailed Steps – Point Cloud to DSM/DTM
9
Apply a
median filter
Detailed Steps – Point Cloud to DSM/DTM
10
Convert
DSM to
DTM
Detailed Steps – Point Cloud to DSM/DTM
11
Export DSM Export DTM
Change Detection  H_Map
12
- Load the DSM and
DTM
- Analysis  Change
Detection
- Difference the layers
- Save to a new file
(H_Map)
Attribute building footprints
• Import SHP to PIX (Vector)
• Analysis  Object Analyst  Attribute
Calculation
– Source channel: H_Map values
– Vector Layer: Building Footprints
– Select “Mean”, derive average value under
polygons
13
Attribute building footprints
14
Represent building heights
15
Legend
Improvements / options
• Automate the process (all automatable through Python)
• Use other sources of elevation (stereo data to derive
DSMs using Geomatica)
• Perform change detection over time
• Replicate workflow anywhere Lidar data and building
footprints are found!
16
That’s it
17
Thank you
www.pcigeomatics.com
info@pcigeomatics.com

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GeoNB Lidar and Building Footprints