Point Cloud Visualization and Shiny Apps

Author

Liam Irwin

Download Presentation Slides (.pdf)

Point Cloud Visualization

Rotating Point Clouds with lidR

Example of a GIF you can produce! (Please don’t use this exact one for submission)

Download the Rotating LAS GIF Script and sample data (.zip)

Contains:

rotating_gif.R - an R script containing the rotating GIF from las/laz function

rotating_las_gif.Rproj - an R project file, use this to ensure the example paths work
las_ex\ - folder containing five example 400m2 plots of drone lidar data to play with

Instructions:

  1. Download and extract contents to a folder
  2. Open the rotating_las_gif R Project using RStudio
  3. Open rotating_gif.R in RStudio, run the script to generate your first gif
  4. Play around with different options until you’re happy with your gif

Potree

River example

Shiny Apps

The TreeDetectoR Shiny App

Tree detection in a Shiny app, try it yourself below!

Download the ITD example ShinyApp (.zip)

Contains:

itd_shiny.R - an R script containing the tree detection Shiny App components

itd_shiny.Rproj - an R project file, use this to ensure the example paths work
data/chm_ext - four example 0.25 m Canopy Height Models (CHM)

Instructions:

  1. Download and extract contents to a folder
  2. Open the itd_shiny R Project using RStudio
  3. Open itd_shiny.R in RStudio and run entire script to initate the shiny app
  4. Load an example CHM (or your own) and play around

More resources

Mastering Shiny - Free textbook by Hadley Wickham

Deliverables

  • Take three PNG screenshots of tree detection results from the ITD shiny app

    • Try out different window sizes, visualization options etc

  • Take a screenshot of your favourite Potree example point cloud, write two sentences about why you found it interesting or “cool”.

  • Create your own rotating GIF from a point cloud

    • Make sure this is less than 50mb in size

    • Feel free to just use the example laz files provided

Download the FCOR 599 Submission Template (.docx)

Upload to Canvas

  1. Word document with four screenshots and your two sentences
  2. Your own rotating GIF!
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