Creation of MapTiles in jpeg
Hi allWe try to reduce the amount of data used by MapTiles. Customer, I used for my tests is about 100 GB of MapTiles for now.
Storage size is not a problem, but it display the theme through the internet. To decrease the amount transferred I am looking at ways to reduce the sizes of MapTiles file.
Currently, all our MapTiles are created as png - results are very good.
-The file size is max 180 kb
-Zoomlevel 5
-256 x 256 pixels
-tiles have correct colors
-MapTile gdalinfo:
Pilot: PNG/Portable Network Graphics
Files: 0_17.png
The size is 256, 256
Coordinate system is "
Structure of the image metadata:
INTERLEAVE = PIXEL
Contact angle:...
1 block = 256 x 1 Type = byte, ColorInterp = Red
Hide flags: PER_DATASET ALPHA
Band 2 block = 256 x 1 Type = ColorInterp = green byte
Hide flags: PER_DATASET ALPHA
Band 3 block = 256 x 1 Type = byte, ColorInterp = blue
Hide flags: PER_DATASET ALPHA
Band 4 block = 256 x 1 Type = byte, ColorInterp = Alpha
Creating a new layer of tile map using the same definition but jpeg instead of png causes problems:
-The file size is max 25 KB (would be a nice size, but not very realistic)
-The colors are false: pale, seems as if the color depth has been reduced to 8-bit or lut with few entries
-MapViewer does not display tiles, shows that empty images containing an x
-MapTile gdalinfo:
Pilot: JPEG/JPEG JFIF
Files: 0_17.jpeg
The size is 256, 256
Coordinate system is "
Structure of the image metadata:
SOURCE_COLOR_SPACE = CMYK
INTERLEAVE = PIXEL
COMPRESSION = JPEG
Contact angle:...
1 block = 256 x 1 Type = byte, ColorInterp = Red
Structure of the image metadata:
COMPRESSION = JPEG
Band 2 block = 256 x 1 Type = ColorInterp = green byte
Structure of the image metadata:
COMPRESSION = JPEG
Band 3 block = 256 x 1 Type = byte, ColorInterp = blue
Structure of the image metadata:
COMPRESSION = JPEG
tested with MapViewer-Versions
-1033p5_B080908
-11_B071001
-11_1_1_B090416
Am I missing a setting or something, is that what I can do to fix this problem or is already a known issue?
Thank you
NilsO
Edited by: NilsO the 17.09.2009 09:45
Hi again.
Here is the problem I think:
You bgcolor = 'none' in the definition, it means, that in the layer of maptile edition page you specified the background to be transparent, but jpeg does not support transparency.
try disabling the checkbox
Best regards, michael
Published by: MickleSh on September 17, 2009 13:07
Tags: Fusion Middleware
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