LAS format and processing DTMs from tins and

LAS format and processing DTMs from tins and

LAS format and processing DTMs from tins and local binning Arrowsmith LAS files: industry standard format

Example of EarthScope Northern California LiDAR data from Mill Gulch along the San Andreas Fault (NCALM data processed at and downloaded from OpenTopography)

Grids in ArcMap for context LASTOOLS Install LASTOOLS somewhere like C:

Install LASTOOLS arc toolbar las2shp using LASTOOLS toolbar

Need to define the projection for the shapefile Need to make a las dataset in Arc LAS dataset in ArcMap

LAS file in ArcMap LAS file in ArcScene

Generating DEMs from LIDAR resampling LIDAR points

triangulating raster DEM j

i temporary TIN interpolating

Isenburg, et al., 2006 Interpolation Methods

Inverse Distance Weighting (IDW)

Natural Neighbors Kriging Splines TIN linear

quintic Isenburg, et al., 2006

DEM Generation via TIN Streaming read points from disk Streaming

Computation of Delaunay Triangulation small buffer

in main memory Immediate Streaming Rasterization

TIN of Streaming output TIN

store elevation rasters to temporary files (grouped by rows) output final DEM

to disk Isenburg, et al., 2006 Example Result

500,141,313 Points 11 GB (binary, xyz, doubles) LIDAR points

50,394 30,500 DEM 3 GB (binary, BIL, 16 bit, 20 ft) raster DEM

on a household laptop with two harddisks in 67 minutes 64 MB of main memory 270 MB temporary disk spaceIsenburg, et al., 2006

blast2dem BLAST2DEM DEM

BLAST2DEM DEM Strip: it's a licensing issue. to get around it (for academic or personal use) you can simply use lastile to make it small enough and then run blast2dem on smaller tiles and then recomposite with GDAL. Martin Isenburg

Windows version: http ://lidar.asu.edu/poin ts2grid.html

An Efficient Implementation of a Local Binning Algorithm for Digital

Elevation Model Generation of LiDAR/ ALSM Dataset (Kim, et al., 2006)

Need comma delimited file for P2G 1 m local binning dem 1 m radius shot density

1 m radius shot density Ground returns only (TIN)

Ground returns only (1 m radius IDW) Points over bare earth surface

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