[worldKit-dev] Big Blue Marble Next Generation

[Mikel Maron]

A processed tiling of BMNG would be a great resource for worldKit users.

I've heard of this being attempted, just sent out some queries to see how they got on.


For the 500 meter resolution imagery, I speculate that the Zoomifyer tool wouldn't be practical, exhausting memory. (maybe that's an understatemnet)
It would be possible to script, using ImageMagick .. though again, the problem with JPEG is that the entire file must be loaded into memory for it to be decompressed.

How large is the 500 meter image? Is it a JPEG, or another format?

Wouldn't necessarily need to rename the images according to Zoomify's scheme. Each image could be saved to a file identifying its N/S/E/W bounding box. worldKit could be configured to access these files via <wms>


For the 2k imagery you processed, you could script post processing on the tiled images with ImageMagick, adjusting the brightness.


Another possibility is to use public WMS servers hosting BMNG imagery. This of course is not as reliable as having your imagery.

Mikel


----- Original Message ----
From: David Smith <dsmith at sitemeter.com>
To: worldkit-dev at lists.brainoff.com
Sent: Friday, January 27, 2006 2:30:38 PM
Subject: [worldKit-dev] Big Blue Marble Next Generation

Has anyone created the zoomify images for worldkit using the latest
satelite Blue Marble images? 

They now go all the way down to a 500 meter per pixel resolution and there
are separate images for each month of the year. 

http://visibleearth.nasa.gov/view_set.php?categoryID=2355

I selected one month at the 500 meter resolution and started working with
the images and found that I'd probably have to process one eight of the
the world at a time (because the resolution is so high) and then write a
script to rename the zoomify images that were created for each eighth. But
that was as far as I got. 

So, I decided to just use the 2km resolution. When I was finished, I
discovered the images were really too dark to use. None of the image
editing programs I have can handle a 21600x10800 size JPG so I couldn't
lighten them up.  

Anyone make any better progress with them?


-=David


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