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Resample LOD = Auto = Best?

J

jdhaenens

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unitedstates
OK, I resampled my geotiff whose original resolution was one foot per pixel (actually 3.4e-06 deg wide by 2.8e-6 deg tall per pixel)and output it in three different LOD's:

15 ... 1.19 m/pixel ...completed .bgl file size 6.24 mb
16 ... 0.59 m/pixel ...completed .bgl file size 22.8 mb
17 ... 0.30 m/pixel ...completed .bgl file size 82.4 mb

I also resampled with LOD = Auto ...completed .bgl file size 122 mb.

When I use the lod 15-17 .bgl's performance is horrible. I can't even see the whole airport without tiles kicking off even though my scenery settings match the lod's and radius is set to max. in the LOD=auto .bgl, I have no performance issues and can see from one end of the photoreal area to the other.

I don't understand what's going on with the performance issues. I thought that the smaller the .bgl, the better the performance.

Incidently, when the LOD is specified, the resulting tiles do not mask the Autogen, but in LOD=auto, the autogen is masked along the visible boundaries.

Here is the resample .inf file:

[Source]
Type = GeoTIFF
SourceDir = "SourceData"
SourceFile = "knpa1m.tif"
Layer = Imagery
Variation = day
NullValue = 0,0,0

[Destination]
DestDir = "Output"
DestBaseFileName = "knpaphoto"
DestFileType = BGL
LOD = auto


Can anyone help me get started in the right direction?

Jim
 
I think you have answered your own question as to which is better. I must admit that it never crossed my mind that FSX would benefit from a smaller file size in this case, it makes more sense to compare this with mipmaps -- leaving out some mipmaps may make the file size smaller, but performance will suffer. I think that in your case you benefit from lower LODs using Auto.

By the way, I suspect that meshman meant to add this:
CompressionQuality = 85
 
Life is good. 85% CompressionQuality reduced the size to 20.6 mb. I could tell some loss in wuality but it's still better that a 1M/pixel resample that won't act right.

Thanks guys!

Jim
 
jdhaenens said:
I don't understand what's going on with the performance issues. I thought that the smaller the .bgl, the better the performance.
Click to expand...


Your processor has to actually decompress the image for display first IIRCC, so even though the file size is smaller, the performance may not be better
 
From reading Phil Taylor's blog, I get the impression quite a bit of tweaking has gone on with this between RTM and sp1 - sp2. You might want (if you have the means) to look at performance with different sp installed.

scott s.
.
 
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