Imagery was taken from nasa bluemarble project
Processing was done on the data of january 2004 and the topographic map of august 2004, the large png files.
Main imagery were 8 tiles of 21600 pixels square.
Software used was java1.5 ( new ImageIO ).
Hardware used was a single opteron 146 / 3gb memory.
------------------- | A1 | B1 | C1 | D1 | ------------------- | A2 | B2 | C2 | D2 | -------------------
Scale : subsampling rate eg. 144 is 144 times smaller.
Stepping : for that scale the stepping in longitude/lattitude in wich the images were generated.
-------------------------------------------------------------------- | Scale | 144 | 36 | 18 | 12 | 6 | 4 | 2 | 0 | | Stepping | 90 | 22.50 | 11.25 | 7.50 | 3.75 | 2.50 | 1.25 | 0.625 | --------------------------------------------------------------------
Tiles were cut at 150 pixels wide in progressive jpg format and compressed at ratio 0.5.
Images are stored in the following directory structure/naming :
/$scale/$lat.000x$long.000.jpg
Longitude goes from -90 to 90.
Lattitude goes from -180 to 180.
Directory structure is as follows :
Since i'm not a guru in javascript, I did my try here, but I can imagine that there is better code to do this ( code that is actually working :p )
I used as a base the code from ka-map.
On mozilla under linux, i'm still having some kind of delays ........, explorer hangs ....
If anyone finds a better way to do it -> contact mogo at mogo dot be.
Next step is to map it with 3d api....., let's first see this is working.