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PostPosted: Thu, 04-10-07, 17:35 GMT 
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Andrea,

one of us should quickly do a level 5 set for December, say, and compare lake Meade water levels with those of the June map!

Also it is unclear, for which months the official watermap has been done. Water changes over the year...

Cheers,
Fridger

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PostPosted: Thu, 04-10-07, 17:44 GMT 
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t00fri wrote:
Of course, the idea is to jointly move towards the best possible scientific rendering of our planet ;-) . Yet such things take time and lots of testing... Notably to do all these efforts simultaneously for Win32, Linux and OSX-universal operating systems...
So indeed this new format has to be supported first, implemented into the tools etc.
Cheers, Fridger

Well, this means "yes, but later on", and it looks very satisfactory and appreciated, thank you. :D
In the meanwhile, I'll use swapping between your and Jmii's Earth VT images, the former as default, the latter when showing close-ups in full daylight.
Not so nice, but it works. :wink:
Bye and thank you once again.

Andrea :D

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PostPosted: Thu, 04-10-07, 17:47 GMT 
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t00fri wrote:
Andrea, one of us should quickly do a level 5 set for December, say, and compare lake Meade water levels with those of the June map!
Also it is unclear, for which months the official watermap has been done. Water changes over the year...Cheers, Fridger

OK, I'm offering as volunteer, I have already the December Earth map, so I'll try it. :wink:
Will inform on results, probably tomorrow.
Bye

Andrea :D

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PostPosted: Thu, 04-10-07, 18:20 GMT 
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Reading the srtm Quickstart PDF, the SRTM3 HGT data looks like this:

- Signed 16-bit Big-endian, no header
- Each tile is 1201x1201 pixels (1 degree x 1 degree latitude x longitude, about 30m resolution)
- Filenames refer to the latitude and longitude of the lower left pixel
- Greenland, northern Russia, and Antarctica appear to be not covered


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PostPosted: Thu, 04-10-07, 19:37 GMT 
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dirkpitt wrote:
Reading the srtm Quickstart PDF, the SRTM3 HGT data looks like this:

- Signed 16-bit Big-endian, no header
- Each tile is 1201x1201 pixels (1 degree x 1 degree latitude x longitude, about 30m resolution)
- Filenames refer to the latitude and longitude of the lower left pixel
- Greenland, northern Russia, and Antarctica appear to be not covered


Yes this needs some blending as in the previous data set. There was of course a (good) reason why we all used Reto Stoeckli's belended srtm2 results ;-) . He did all the work for us...


Cheers,
Fridger

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PostPosted: Fri, 05-10-07, 0:01 GMT 
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t00fri wrote:
Andrea, one of us should quickly do a level 5 set for December, say, and compare lake Meade water levels with those of the June map! Also it is unclear, for which months the official watermap has been done. Water changes over the year...Cheers, Fridger

Hello Fridger, just finished, and here the result:
this is the image of Lake Meade on June:

Image

and the same on December.

Image

I see no variations in waters, just a few snow E and NE of the Gran Canyon (that is at about 2000 meter a.s.l.), much more green and everything darker, I think due to fallen rains. :shock:
My little cent.
Bye

Andrea :D

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PostPosted: Fri, 05-10-07, 13:19 GMT 
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Another test, that confirms that the problem is in watermap.
This is with wartermap coupled to specmac

Image

and this without watermap

Image

As you see the whitish spots disappeared almost completely. :wink:
But there is a strange and ugly behaviour, it looks like the image be composed by very small squares, well visible when closer.
Dunno the reason why.
Fridger?
Bye

Andrea :D

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PostPosted: Fri, 05-10-07, 14:16 GMT 
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Andrea,

watermap shading algorithms are complicated and also prone of misidentifications.

Clearly, there is NO "free lunch" here:

If you want to enjoy the beautiful reflectivity of many thousands of lakes in Northern Canada or of the Amazon river with its many branchings...then you absolutely need such a hires watermap. The present BMNG is the best there is in a ready to use simple cylindrical format.

If, however, you are disturbed by a number of little deficiencies/misidentifications then you have to use a specmap (like Jestr did apparently) that only distinguishes between oceans and land. That's what we all did >= 3 years ago ;-) .

In any case the present specmap used with my tools was considerably improved relative to the original BMNG watermask, since I substituted the ocean boundaries from the (srtm2) elevation map, using elevation=0 as the ocean definition. Unfortunately this does not work for little lakes and rivers.

Cheers,
Fridger

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PostPosted: Fri, 05-10-07, 14:43 GMT 
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t00fri wrote:
dirkpitt wrote:
Reading the srtm Quickstart PDF, the SRTM3 HGT data looks like this:

- Signed 16-bit Big-endian, no header
- Each tile is 1201x1201 pixels (1 degree x 1 degree latitude x longitude, about 30m resolution)
- Filenames refer to the latitude and longitude of the lower left pixel
- Greenland, northern Russia, and Antarctica appear to be not covered


Yes this needs some blending as in the previous data set. There was of course a (good) reason why we all used Reto Stoeckli's blended srtm2 results ;-) . He did all the work for us...


Sounds like it'd would be hard to devise an automated tile stitching tool that works in general. :(


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PostPosted: Sat, 06-10-07, 17:11 GMT 
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Here is another try to obtain the best image set for my Earth Tour.
I tried to couple the maps obtained with F-TexTools-1.0pre3, so with ALL the stuff, including spec and water maps, plus the normal obtained with nm tools, that you see here:

Image

but coupling too the Jmii's 64k specmap.
Here is the resulting miracle:

Image

As you see, the white spots disappeared, but without spoiling excessively the lake shores.
I know, I know, it's not elegant, at the end it uses
spec + water + world.200406.3x86400x43200.bin.gz + normal + Jmii's 64k specmap.
Too many indeed.
So I tried to obtain the worldmaps without the spec-watermap coupled.
I used this command line to reduce the original file at power of 2 size:

tx2pow2 3 86400 < level5\world.200406.3x65536x32768.RGB.bin

and then this to make the level5 tiles:

txtiles 3 65536 5 2.7 < world.200406.3x65536x32768.RGB.bin

It didn't work, even if I modified the channels number to 3, as given in the README.doc
Where did I make a mistake?
And, please, what is the right command line to obtain with F-Textools the worldmap WITHOUT spec-water addition? :oops:
This way the results, as shown in my image, could be much more real than WITH spec-water, until the next-next generation will be available, IMHO.
Thanks a lot, Fridger for your suggestions.
Bye

Andrea :D

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PostPosted: Sun, 07-10-07, 21:02 GMT 
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Andrea,

I just returned from a very nice weekend in Berlin. Since we walked ~20 KM in the city today, I am also a bit tired. So nothing sensible anymore from me today. ;-)

BUT, since your results are interesting, please try and let me know ON WHAT scientific data Jestr's 64k specmap was based?

Bye Fridger

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PostPosted: Sun, 07-10-07, 22:40 GMT 
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t00fri wrote:
Andrea, I just returned from a very nice weekend in Berlin. Since we walked ~20 KM in the city today, I am also a bit tired. So nothing sensible anymore from me today. ;-) BUT, since your results are interesting, please try and let me know ON WHAT scientific data Jestr's 64k specmap was based? Bye Fridger

Hello Fridger, welcome back.
Sincerely I don't remember where Jestr found the specmap data, but I'll make a search, and/or contact him on the matter. :wink:
Hope to have the information soon. 8)
Bye

Andrea :D

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PostPosted: Sun, 07-10-07, 23:59 GMT 
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Found it! :wink:
The file from Jestr is JestrEarthSpecular PNG.zip that is in the Jestr directory of Celestia Motherlode Creators, and its ReadMe.txt file says as follows:

......This VT was made from the landcover.E.21600x21600.gz and landcover.W.21600x21600.gz files available here ftp://mitch.gsfc.nasa.gov/pub/stockli/bluemarble/ though I made some changes by hand to match in with my texture and to uncover lots of little islands especially in the Pacific (and Hawaii). ....Any problems Email me jestr@ntlworld.com

So it's the 43200x21600 texture, upsized to 64k. :shock:
Bye

Andrea :D

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PostPosted: Mon, 08-10-07, 1:18 GMT 
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Andrea wrote:
And, please, what is the right command line to obtain with F-Textools the worldmap WITHOUT spec-water addition?


This works for me:
Code:
cd level 5
gzip -dc < ..\world.200406.3x86400x43200.bin.gz | tx2pow2 3 86400 | txtiles 3 65536 5


In your example, you typed: txtiles 3 65536 5 2.7
The last parameter to txtiles is optional. It denotes the PNG compression level.
If you do specify it, use integers 1,2,3,...9.


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PostPosted: Fri, 12-10-07, 12:12 GMT 
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I finally got around to generating a full level0-5 VT 64k rgba and normal map set!

Not sure if the following is a bug in either 1) the original data, 2) the texture tools, or 3) Celestia,
but in some cases I can see seams on the Earth. This is what I mean:

Image
Image
Top: Normal rendering, bottom: wireframe (the seam is occurring on a polygon boundary)

Here is a cel url: Cel URL

* The rgba tiles are PNG, and were generated from the 86400 (200406) dataset and watermap
following the exact instructions listed in the announcement forum.
* The normals are dxt5nm, also generated using the same data mentioned in the nmtools tutorial.

The seams are faintly visible even without the normal map.


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