List of useful public domain extensions for ArcView 3.x
Grid tools
Extension Brief Description Documentation Author encrypted? Requires Relevance Stability Appearance User Friendliness
Single Cell Editor Tool for editing of single cell values in a Grid
sc_editor.txt
John Grayson no Spatial Analyst, Dialog Designer 
Grid Tools (Jenness Enterprises) Several tools for calculating Grid neighborhood statistics, generating complex legend color ramps, and combining, merging, mosaicking and clipping grids. Also includes a tool to generate custom neighborhoods.
GridTools_doc.htm
Jenness Enterprises
no Spatial Analyst, Dialog Designer 
Surface Tools Calculate various surface and topographic characteristics for points, lines or polygons in a theme, particularly profiles.
SurfaceTools.txt
Jenness Enterprises
no Spatial Analyst, Dialog Designer 
Kriging Interpolator 3.1 for Spatial Analyst FULL implementation of the kriging commands in Spatial Analyst
kriging.txt
Marco Boeringa no Spatial Analyst, Dialog Designer 
comprehensive help functions
Kriging Interpolation Generate contour/surface with Kriging method
KGDI.txt
Yi Tang partly Spatial Analyst, Dialog Designer 
Surface Interpolator Gives access to all four surface interpolation techniques provided with Spatial Analyst. For Kriging, the user can examine SemiVariograms before interpolating the surface
Surf_Interpol.txt
Thad Tilton no Spatial Analyst, Dialog Designer 
problems if GUI set to "large fonts"

not all functions are clear
Spatial tools A collection of Grid Tools, including Warp, Cleanup, Merge, Clip, Mosaic, Aggregate and others
SpatialTools.pdf
Phillip N. Hooge
no Spatial Analyst
several functions only work with integer grids

requires printed documentation for rational use
Filters A large selection of convolution kernal filters for grids
Filter.pdf
Kenneth R. McVay no Spatial Analyst, Dialog Designer,
filter.dll

still beta version
Hydrologic Modelling Extends the Spatial Analyst to support hydrologic modeling - with accumulation weight grid ESRI / modified no Spatial Analyst
Hydrologic Modelling Extends the Spatial Analyst to support hydrologic modeling (v1.1) - new version, principally summarizes catchment characteristics  to shape file ESRI no Spatial Analyst, Dialog Designer
Basin1 Userfriendly tool for calculation of individual watersheds, rain drop path etc.
basin.htm
Ivan Petras no Spatial Analyst
don't forget to use the 'initiate button' first
ImageWarp An extension for warping images into a known projection
ImageWarp.pdf
Kenneth R. McVay partly Spatial Analyst, Dialog Designer,
g2i.dll

fairly intuitive
Grid Projector Reprojects grids
Gridproj.pdf
Kenneth R. McVay no Spatial Analyst

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status: 18.05.2005