Discussion: 3D map

If someone enjoys watching stereographs, here is O map one with a simple web viewer.
http://www.routegadget.net/karttapullautin/3dviewe...

Zoom in and out with keys z and x, move with arrow keys.

Read more here about how to view these graphs (parallel viewing):
http://www.lightwave.soton.ac.uk/experiments/stere...

If you have hard time focusing it you can try zooming out a bit with browser (in Firefox: ctrl - )

Old AP thread about seeing O map in 3D:
http://www.attackpoint.org/discussionthread.jsp/me...

that's cool

I'm used to really big stereographs where you have to cross your eyes rather than look to infinity (or even let your eyes go outside the normal limit, like the Simpson's).

Can you add a switch to reverse the images (right image on the left and left image on the right)?

When I zoom to 200% (images 100mm on a side), I can't get my eyes to bug-out enough to get it, but I can trivially get a reverse image by crossing my eyes. I suspect most people could view almost full-screen images this way.

I know it sounds weird to recommend "crossing your eyes", but it is basically what you do to view near objects anyway.

See the discussion of "wall-eyed and cross-eyed" under the "autostereograms" heading of the wiki page. Also, the image to the right there is for cross-eyed viewing—read the caption (and try it of course). Cross-eyed allows bigger images to be viewed.

Yeah, likewise, I kept getting this in inverted stereo effect. I finally got it to work, but it's harder for me to focus that way. And I had the same thought -- a button to swap the two images is exactly what I need.

Add ?swap to url to swap images. Like this
http://www.routegadget.net/karttapullautin/3dviewe...
Don't strain your eye muscles.

Cross-eyed medhod used to be easier for me too back in the 90's when autostrereogram posters were popular. But these days I find parallel view method far more relaxed, and it also allows me to look screen closer, or about at normal distance, without ever getting any strain.

I used to have some of those sterograph posters popular in the early 90's and usually found it easy to see the '3d'.
However I've tried these links and dont feel they give me much more than the basic map ..... I'm hoping it's just because of cognitive ability to convert visual 2d contour lines into 3d forms in my head? ...i.e. so I'm just not seeing anything 'extra' here.

Are you using one of the steep areas? Look for a lot of cliffs.

Great fun!

You should be able to see unmapped land forms. Some unmapped depressions (depressions are erased), some unmapped land forms between contours, height difference between knolls - some being higher and some flat, some ditches having some depth and some none. Also you should be able to figure how much z dimension is exaggerated (it is). You should even be able to see places you could improve map a bit by editing contours a little to hit the actual land forms more nicely. Those are something you can't easily see without actually seeing it in 3d, just by reading contours the normal way. When you look at it you should see 3 maps squares in front of you, sharp 3d one in the middle and one blurry ghost map on both sides).

Works much better with the swap, thanks.

?swap doesn't work for me at all. The other one works great.

Different approach. Use mouse wheel and drag with left and right button. To move and turn around.
http://routegadget.net/3d/pukkamaki/
http://routegadget.net/3d/buenavista/

Very nice, thanks.

Now you can change forest opacity and swap between maps on the fly without camera reset (Pukkamäki area).

I like how you can view from the side and get the contours to collapse to straight lines, like sedimentary rock layers.

Aerials, infrared and Finnish Nationals Survey's "basic map" added (yes we have an nation wide open dataset like that, the quality is quite amazing) to the Pukkamäki viewer. And aerials (ortho imagery) can be use as forest "material".

As ebuckley wrote 7 year ago vertical scale is usually exaggerated when viewing like this. Here about 3 times.

Also, Jagge, I just have to say that I'm amazed by the Karttapullautin contours. I'm not saying they're perfect, but they're better than anything else I've seen straight from lidar.