[GRASS-user] LAS to DEM

[Markus Neteler]

On Thu, Feb 25, 2010 at 4:36 PM, Jim Blix <blix at wiktel.com> wrote:
>
> We recently acquired a very nice data set that includes bare earth 1-meter
> LAS files and DEMs. I'd like to do various terrain analyses, but I will need
> to integrate the hydrologic enforcement and breaklines, etc. into the
> elevation data.
>
> I'm new to raster analysis, and my agency does not want to invest in any
> more ESRI extensions. So I've made a commitment to GRASS and other open
> source solutions.

Excellent: welcome!

> I need a plan to integrate breaklines into the raster files and cut through
> the digital dams that are inherent in LiDAR data. Do I need to produce TINs,
> or can GRASS do a good job going from LAS to DEM?

Here are a series of methods:
http://grass.osgeo.org/wiki/LIDAR

> What works for you GRASS ninjas?

Be sure to get a recent GRASS 6.4 or later due to relevant bugfixes. Then
happy analysis,

Markus

PS: Don't hesitate to enrich the WIki or post your experience here.