Contents

• Lidar
• Point Data Abstraction Library
• Binning Lidar
• Interpolating Lidar
• Volumetric Change

Lidar

What is lidar?

Download tiles of lidar from: https://orthos.dhses.ny.gov/ Zoom in on Governor’s island and then click the download icon. From the Lidar results tab download the following lidar tiles from 2017:

NYC_TopoBathymetric2017_LiDAR

• 975187.las
• 975190.las
• 977187.las
• 977190.las
• 980187.las
• 980190.las

USGS_NYC2014_LIDAR

• 18TWL820030.las
• 18TWL820045.las
• 18TWL835030.las
• 18TWL835045.las

Point Data Abstraction Library

Point Data Abstraction Library

Install Anaconda

Install PDAL

On Windows right click on the Anaconda3 prompt and run as Administrator

conda update conda
conda install -c conda-forge pdal
conda install -c conda-forge pdal python-pdal gdal

r.in.pdal

g.extension extension=r.in.pdal

Binning Lidar

Start GRASS GIS in the nyspf_govenors_island location in a new mapset called lidar.

r.in.pdal input=D:\nyc\lidar_2017\975187.las output=binned_2017

g.region n=189850 s=189100 e=978550 w=976850 save=landforms
r.mask vector=shoreline

Import all 2017 tiles

Then set region to landforms and reimport

Binned Lidar

Interpolating Lidar

Volumetric Change

Later in digital fabrication chapter 3D print difference in 2014 and 2017?