Tiling effect when low angle towrds horizon

[Thomas Risan]

Hi,
I have experienced a "tiling" effect when I look towards the horizon in a low angle and the 3D effect is switched on.

This makes it pretty useless to try to look at features in a "near-ground perspective".

The images look like layers at different elevation, with horizontal walls between the different image borders.

See the enclosed image for an example:




Is this possible to fix? Or must I learn to live with it.

Kind regards, T

[Llynix]

Originally posted by Thomas Risan@Nov 16 2004, 03:52 AM
Hi,
I have experienced a "tiling" effect when I look towards the horizon in a low angle and the 3D effect is switched on.

This makes it pretty useless to try to look at features in a "near-ground perspective".

The images look like layers at different elevation, with horizontal walls between the different image borders.

See the enclosed image for an example:
Is this possible to fix? Or must I learn to live with it.

Kind regards, T
Quoted post


See this post : http://learn.arc.nasa.gov/worldwind/forums...owtopic=642&hl= (http://learn.arc.nasa.gov/worldwind/forums/index.php?showtopic=642&hl=)

Buachaille's explanation is right on.

[Thomas Risan]

Here's a better example of what I'm talking about:

[Thomas Risan]

oops swift answer!
Thanks for the link, I'll read it right away.

[JamminR]

Llynix, Until now, I would have agreed with you and the other forum thread's explanation.
But. I've been playing with WorldWind this last weekend.
Explored the USGS b&w 1m photo's of my town, at the same time, downloading SRTM data. (Lucian had tests running this weekend, see this thread (http://learn.arc.nasa.gov/worldwind/forums/index.php?showtopic=634) for my question and his mention of it)
I have majority, if not all, of my area and the mountains around the valley I live in.
(WorldWind + SRTM = Beautiful, by the way)

I didn't realize until now, if I adjust the camera angle, or zoom below, about 6500 meters, the 'tile' area closest to my camera view goes flat.
This is either a bug, and belongs in the bug forum, or an annoying feature by design.
I know the height data is there, it works fine above 6500 meters.
It goes flat if I try to zoom in.

Until now, most of us wouldn't have known, since JPL has been down 100%.
Now that its been in some testing, I just noticed this.

Now, this -may- be due to something screwy with Nowak's version of the configuration, as I'm using his latest that includes Mars. Or, some odd data stored in his cache perhaps.

I'll do some testing as I have time. Its late, I'm tired, and I still have laundry to hang.
:rolleyes:

[JamminR]

I just tested the original WorldLayers.xml.
Went to Mount Saint Helens, which I had downloaded from the Add-On page before Nowak made a config file that loads cache from his server(s), then tries JPL.
I found that..
1. The 'JPL landsat' images never tiled while looking around, no matter what angle/altitude.
2. If I switched to the B&W USGS photo's, 'flat' tiling occurred. If I zoomed out, or changed my camera angle to a more top-down view, the 'tile' that had flattened would come back to normal 3d volcano view.

Does the SRTM data not work with USGS view modes?
Is it supposed to?

I viewed my city using the cached JPL 250km (level 1?), and the 3d looked fine, although the details are blurry below 8500meters.
Once I switched to USGS Urban or standard, 'tiling' occurred.

[Thomas Risan]

JamminR,
I use the landsat data and not the USGS data, and experience the "tiling effect", so do not think it is a USGS dataset problem. I second your suggestion that this must be either a bug or a "feature" by design.

Kind regards/T