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Archive for the '3DEM' Category

3DEM Website Is Gone, But 3DEM Still Available Here

I’ve covered the program 3DEM before on this blog; it’s a first-rate 3D terrain visualization program, and does the best out-of-the-box map relief shading of any free program I know. Here’s a standard USGS topo shaded with a digital elevation model using this program:


Unfortunately, the author, Richard Horne, has ceased development of the program, and shut down the website permanently. But he’s graciously given me permission to host the last version of the program (version 20.7) here on Free Geography Tools; you can download it here. It comes with a full PDF manual, and my posts may offer additional insight on using it. I can offer some limited help if you run into problems, but any bugs in the software are there to stay.

Free Landscape Rendering Software

Download Squad posts that Bryce 5.5, a program that creates photo-realistic landscape renderings and animation with vegetation and realistic skies, is available as a free download (registration required to get a free serial number). While it lets you create your own topography, it also accepts DEMs as input for the landscapes. This is one version below the current 6.1 release, but is still feature-rich. Unfortunately, it also has a very idiosyncratic interface that takes a lot of getting used to. Here’s a review of the program from PC Pro, with some screen shots.

There are other free programs for realistic landscape rendering, with some limitations compared to Bryce 5.5 but also somewhat easier interfaces to navigate:

Genesis IV: Available in a freeware edition for personal use, as well as several paid versions.

Terragen: The free non-commercial version limits the output resolution. There’s also a Technology Preview release of Version 2.0 available as well, though it has a fairly technical interface.

The free program 3DEM can convert a number of DEM formats to Terragen’s native terrain format, and to formats compatible with Genesis IV.

Elevation, Slope, Terrain And 3D Anaglyph Map Shading In MicroDEM

For general map relief shading, my first choice is usually 3DEM, since it usually gives the best results. But MicroDEM also does a decent job at terrain relief shading, and has a few other shading options that 3DEM lacks.

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Animated Flooding Maps – Storm Surge, Sea Level Rise And River Flooding

A while back, I did a post on assessing the effects of sea level rise on coastlines using the program 3DEM. Here’s a terrain image of southern Manhattan Island at current sea level:


And here’s what it would look like with 8 meters of flooding, due either to a hurricane storm surge or global-warming-induced sea level rise:

Manhattan flooded by eight meter sea level rise

The problem with the latter image is that 3DEM did a basin flood, i.e. it filled in all the terrain that was less than 8 meters below sea level, without taking topography into account. For example, a range of hills could lie between some lowlands and the sea, but 3DEM wouldn’t take that natural dam into account. But I also posted an animated flooding map of the same area that did take that terrain blocking into account (click on the “play” button to view the animation):

Today’s post will show how to create such a flooding animation.

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Modifying The Terrain Reflectance Display In MicroDEM

Yesterday’s post dealt with the basics of installing MicroDEM, and opening up DEM terrain files in the program. Now it’s time to look at different ways to display terrain reflectance in DEM. While 3DEM is better for some kinds of displays, MicroDEM has more different ways to display reflectance.

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Recap Of 3DEM Series

A brief summary, with pictures, of all the posts in my 3DEM series.

DEM Terrain Depiction Using 3DEM

Visualizing digital elevation model (DEM) data as colored, shaded terrain.


Easy Map Relief Shading Using 3DEM

Combining DEM data with a flat map, to convert this:


to this:


Sea Level Rise, Storm Surge, And Flooding Effects Using 3DEM

Using 3DEM to show the effects of sea level rise on the coastline. For Manhattan today:


a rise in sea level of 8 meters due to storm flooding or sea level rise will result in this new coastline:


3D Perspective Views With 3DEM

Overlaying maps or photos on top of terrain with 3DEM to create either static perspective views:


or animated rotating perspectives:

VRML Worlds Using 3DEM

How to create interactive, 3D VRML worlds for terrain, with or without map/photo overlays:


GPS Track Elevation Profiles With 3DEM

Generating a terrain profile from a GPS track:


Animated Flybys Using 3DEM

Creating an animated flyover of terrain, with or without map/photo overlays:

Animated Flybys Using 3DEM

There’s one last feature in 3DEM I want to talk about: the ability to create animated fly-bys over terrain, with or without an image overlay. Doing a comparable animation with Google Earth requires either the expensive Pro version, or a copy of FRAPS for $37. While 3DEM’s animations aren’t as fancy as the ones you can get with Google Earth, they’re pretty good.

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GPS Track Elevation Profiles With 3DEM

3DEM ostensibly comes with a number of GPS interface capabilities, including the ability to download waypoints, routes, and tracks, and upload waypoints created in the program. I say ostensibly because I could only get one of the features to work with my Garmin 60Cx, downloading tracks; maybe you might be able to get more to work with your GPS model. But even that one feature allows you to do something more than just display the track on top of a terrain image: it lets you see the elevation profile for the entire track.

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