Efficient Raster Formats - Autodesk 15606-011408-9330 - MAPGUIDE R6.3 SITE LIC-UPG R6 User Manual

Format
JPEG
MrSID
PNG
TGA
TIFF

Efficient Raster Formats

Because raster images can be quite large, they can slow down performance.
To improve performance significantly, use tiled TIFF files, ECW files, or
MrSID version 1.6 files.
Tiled TIFFs
A tiled TIFF file allows Autodesk MapGuide to access only specific portions of
the image. This greatly improves access speed, because Autodesk MapGuide
Server does not need to load the entire image every time—just the specific
portion requested. The difference in performance between using standard
TIFF files and tiled TIFF files is dramatic. You can use Raster Workshop to
generate tiled TIFFs from other raster file formats.
ECW Files
ECW, supported by ER Mapper, is a wavelet-based image compression format
with high-quality results at high compression rates.
MrSID Files
MrSID (Multi-Resolution Seamless Image Database), supported by Lizard-
Tech, Inc., is a wavelet-based image compression format designed specifically
for GIS to enable true portability of large images. Autodesk MapGuide
supports MrSID version 1.6 format .sid files.
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102 Chapter 5 Working with Data in Autodesk MapGuide
File Description
Extension
.jpg, .jpeg Joint Photographic Experts Group
.sid Multi-Resolution Seamless Image Database
.png Portable Network Graphic
.tga TrueVision Targa 2.0 Format
.tif, .tiff Tagged Image File Format