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README.md

Point Cloud Workshop

Introduction

  • Oslandia - for all additional information, support or question, please contact infos+3d@oslandia.com
  • Logistic
  • Working environment

Things to do first

In order not to loose time, we will take some actions first. Open a terminal and run the following commands.

wget -O workshop.zip https://codeload.github.com/Oslandia/workshop-pointcloud/zip/master
unzip workshop.zip
sudo sh workshop-pointcloud-master/en/deps/install_deps.sh

Concepts and technologies

  • LIDAR and point cloud
  • Amount of data
  • Technologies :
    • PostGIS
    • pgpointcloud (schemas, pacths, types, ...)
    • PDAL (pipeline, filter, writers, ...)
    • pgAdmin
    • QGIS
  • Conclusion

Proceedings

Step 1

Use of libLAS tools (las2las, lasinfo, las2txt).

Step 2

Use of the PDAL pipeline.

Step 3

pgpointcloud and pgAdmin (Object Browsers and Query Tool).

Step 4

  • See the LIDAR data coverage through QGIS
  • Database manager
  • Simple queries to work with the point cloud (filtering, statistical data)
    • Cropping
    • Average, max and min computation
    • Retrieve the altitude of the Puy-de-Dôme
    • Convex and concave hull per altitude levels

Data

We'll use data from CRAIG on Clermont Ferrand area as well as data coming from OpenStreetMap.

CRAIG provides a wide range of Open Data, as can be seen in the catalogue:

In particular, some LIDAR data are provided on several areas. These can be directly viewed online within your web browser:

And the FTP allows to download these data:

  • ftp://opendata.craig.fr/opendata/

Moreover, some webservices are available and provided on the below web page:

Otherwise, we'll use WMS layers to display a base map within QGIS:

About OSM data, we'll use exported data provided by GeoFabrik, downloading and using data on the Auvergne area:

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