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Chapter 5
Working with Data in Autodesk MapGuide
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.
JPEG
.jpg, .jpeg
Joint Photographic Experts Group
MrSID
.sid
Multi-Resolution Seamless Image Database
PNG
.png
Portable Network Graphic
TGA
.tga
TrueVision Targa 2.0 Format
TIFF
.tif, .tiff
Tagged Image File Format
Format
File
Extension
Description
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