FANR5640/7640



    Improvement of clip by extent example from Wednesday…  The following code clips the LAS to the boundary of the shapefile.  (example data) library(lidR) library(rgdal) setwd("c:/temp/sf/") tdat<- readLAS("sp2_pcloud.las") plot(tdat) tpoly<- readOGR( ".","AnalysisUnit") clpdat <- lasclipPolygon(tdat, tpoly@polygons[[1]]@Polygons[[1]]@coords[,1], tpoly@polygons[[1]]@Polygons[[1]]@coords[,2]) plot(clpdat)     COARSE WOODY DEBRIS EXAMPLE: Task at hand is to determine […]

FANR5640/7640: Lecture 15 – It Is Friday…





In this lab, you will generate a point cloud and an orthophoto from photos captured during one of my UAV flights last November. You will use the LiDAR toolset in Global Mapper to generate a bare ground “terrain” model and a “surface” model (includes trees, stumps, buildings, etc). ——————————————————————————— Create […]

FANR5640/7640: Lab 8 – Global Mapper Pixels to Points





‘Are you getting the accuracy you expect with Pix4Dmapper?’ 1 1 https://pix4d.com/getting-expected-accuracy-pix4dmapper/, last accessed 2/27/2018. Project Summary: Original flight with a Phantom 4 Pro with 95% frontlap and 90% endlap and a 2.9cm ground sampling distance (GSD).  The GSD is the distance between two consecutive pixel centers measured on the ground.  For […]

FANR5640/7640: Lecture 12 – Project Planning