Free extensions for ArcView GIS
reviewed by Klaus Jacobi
List of useful free - but NOT Public Domain - extensions for ArcView 3.x
Raster image tools
By default, only raster images in the basic TIFF, BMP and some special satellite image format (e.g. LAN) can be viewed directly under ArcView. For JPEG and SID images ESRI is providing the necessary extensions. For the newer formats ECW and JPEG2000 the necessary extensions (.avx as well as .dll) are provided by other companies; these extensions may not be found on the ESRI download page.
The extensions are free to use, but the software is not Public Domain or Open Source. Therefor, at this page I am only offering reviews and download locations from the original software companies.
Please note, that this list is not exhaustive; it just includes those image formats I am commonly working with. Basic BMP and TIF do not require an extension.
|Extension||Brief Description||Notes /Documentation||Author||encrypted?||Requires||Relevance||Stability||Appearance||User Friendliness|
|JFIF||Linking and viewing JPG images||Doss not work with losslees compressed JPG||ESRI||no||jfif.dll|
|IMAGINE||Linking and viewing ERDAS IMAGE images||Does not support transparencies||ESRI||no||imgn.dll|
|TIFF||Linking and viewing TIFF 6.0 images||Even the standard version supports Packbits - but none the LZW compression!||ESRI||no||tif6.dll|
|MRSID||Linking and viewing of MrSID Images||There is a new version of the DLL from April 2005!||ESRI / Lizardtech||no||avmrsid.dll|
|MSIGJP2||Linking and viewing GeoJPEG200 images||Works also with ordinary JPEG2000 files||MSI / Lizardtech||no||msigjp2.dll
|ERMapper||Linking and viewing of JPEG2000, ECW and ER Mapper Images||Version 3.0 from May 2006.||ER mapper||no||Installation routine, generating a whole new subdirectory|
|ImageWarp||An extension for warping images into a known projection
|Kenneth R. McVay||partly||Spatial Analyst, Dialog Designer,
|imagegeoref||Image georeferencing tool for generation of world file
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