Free DEM sources and LIDAR data

The OpenTopography Portal

• Dataset map
• LiDAR data

NCALM LIDAR Data Distribution

CLICK lidar point cloud data


http://seamless.usgs.gov/index.php

http://www.pasda.psu.edu/

Mt. Saint Helens Lidar


Puget Sound LIDAR Consortium

Connecticut LiDAR-based Digital Elevation Data

Napa - Route 29

Detail shot - this DEM is Gov provided 1m bare earth:




View Larger Map

Data and stuff for a script test

well, I've been asked for some data to test .. so here is what I've got on this particular small test project I was working on with that 16bit grayscale script:

first off, there are a few programs worth playing with with this sort of data(LIDAR), its been a while but here's what I think I was using to generate/view/translate the original point data that I received..

Depending on how many trees are in your data, you may have to do so other pre-processing on your point data to get as good a bare earth set of points as possible - that's done with another program .. I've been working with some desert point data so I don't have to worry about that with this data set...

quikgrid; to process the bare earth point data into a surfer .grd - This can take a LONG time if you generate a very detailed grid, and you will have to fiddle with settings depending on your point density/trees, so on sparser point data expect to have to regenerate several times before you get a decent .grd - so set aside a weekend and/or work on small segments at a time - I didn't, even though in stage miles this is a very short bit of road, It still took ages for the 20cm and 30cm tests - Patience, and a Fast computer will both do you good:

http://www.perspectiveedge.com/


landserf 2.3 - now you load that .grd so you can generate the shaded releif you will later use as a background in BTB so you can see where to place track and terrain nodes, also take the opportunity to transfer to a format thats easily readable by scripts and other GIS software .. I've been using arc.asc AKA 'ArcGIS text raster' in the landserf save box

Landserf 2.3 dl:

https://sharepoint.ngdc.wvu.edu/sites/digital_soils/DSM%20Tools/Shareware%20and%20Open%20Source%20Software/landserf230WindowsInstall.jar

Site:
http://www.landserf.org/


now of course is the BTB work, load up that shaded relief as a background, remember your grid corners from quickgrid, and edit the .xml of your BTB save to get the background in the right place..

lay down your track, cross-sections and terrain nodes at appropriate locations on the shaded relief ..

and hope that we can get a script to work!

I would also like such a script to affect surface cross-sections, as this would save much time, cause the generated grids are not perfect, since so much of it is interpolated, it would give a massive head start on the inevitable manual fine tuning.

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Images and data to follow...

First off, here is a 3d view of a grid I generated from LIDAR, this is the data that we are looking at today.

the location is a road just off of a major fault line in California, heading up into the mountains.

Cloudland Truck Trail:

note that I couldn't get the view level in the 3d view, its not that steep =)

here is a shaded relief of the whole dataset just to give you a idea of the area we are looking at:


OK, got the zip of the shaded relief, the BTB test track to be modified, and the .asc gridfile, 20cm resolution uploaded:

DEM, Track, Background

if anyone can get a script working, I'll regenerate the DEM to try and minimize the point data artifacts ... (the graining)

And here is the point data that I generated this DEM from:

Point Data 6018

30cm DEM from LIDAR

Alder Creek rd.

now just to get the script and BTB working with 16bit.pgm files...

hopefully will be able to get this created as a short test stage for Richard burns Rally! Bobs Track Builder is getting better all the time ...

New Stages Soon! WooHoo!!

Blackhole Motorsports RBR Forum

Bob's Track Builder - RaceSimCentral Forums

edit: new forum, the old one crashed

Bob's Track Builder

Tools For Trackmaking

Bobs Track Builder

http://topofusion.com/

http://www.visualizationsoftware.com/3dem.html

http://www.gmap-pedometer.com/

http://bbs.keyhole.com/ubb/showthreaded.php/Cat/0/Number/101188/page/0



http://www.cs.unc.edu/~isenburg/
LAStools: converting, viewing, and compressing LIDAR data
Generating Raster DEM from Mass Points via TIN Streaming

http://www.vterrain.org/

http://koti.mbnet.fi/pkl/tg/TerraConv.htm

http://www.perspectiveedge.com/

http://www.mapzoneeditor.com/?PAGE=DOWNLOAD

https://portal.geongrid.org/gridsphere/gridsphere

http://lidar.asu.edu/
http://lidar.asu.edu/points2grid.html

http://www.usna.edu/Users/oceano/pguth/website/microdem.htm

http://www.landserf.org/