2002.05.09 22:04 "Re: Orientation and Tiled images?", by Michael O'Rourke

In looking at a tiled image I have with orientation of 4, it seems that the orientation should be used to determine the order of the tiles but the data within the tiles is still Y to Y+N. For instance the first tile is the bottom of the image, but the raster lines are from 1100 to 1300, not 1300 to 1100.

Is this normal and correct?

Assuming that I correctly understand what you're saying: No, this is not correct. In a tiled 200x200 tile image, tile 1 will contain rows 1 to 200. Now, if you render this Wx1300 image upside down (orientation = 4), then the first tile will correspond to rows 1300 to 1100 on screen, starting with row 1 in tile 1 corresponding to row 1300 on screen.

The file in question here is, I believe, a file I got from someone on this list about 9-12 months ago to test out ycc support. The file is a satellite picture of the san francisco bay area and is ycc and tiled and about 893 KB.

Does that file sound familiar to anybody on this list? I'd like to find out the app creator since it is not generating the file correctly.

Thanks,

Michael