找到的一些最短路径程序[arcgis]

Fast Shortest Network Paths v1.0
<P>Summary FAST SNP V1.0 for ArcView 3.x (Network Analyst required)

This extension calculates shortest paths between origins and destinations using the pathlength or traveltime. Unlike ESRI-based scripts, this program primarily works with lists instead of tables, which significantly improves its performance (FastSNP should be at least 10 times faster). Fast SNP also validates the results and fixes incorrect shapes (Network Analyst sometimes produces 'overshots').

Refer to included ReadMe-file for further informations</P>
<P>地址：</P>
<P>http://arcscripts.esri.com/details.asp?dbid=11742</P>

thank you

Path of Series of Features, with Distances and Bearings, (v. 3.1) <P>Summary <P>DESCRIPTION: This extension enables you to calculate distance, bearing and angular measurements between a series of features (points, lines, polygons, or X/Y coordinates from a table). This is useful if the features represent places along a path or route and you want to calculate indices for each step of the route. The extension creates a results table and/or polyline shapefiles containing data such as distance and bearing between features, X/Y coordinates, angular measurements, etc. Optionally, you can request graphic lines to be drawn connecting each feature with the next feature in the series.

GEODESIC CURVES: If your data are in point format (either from a table or a Point theme) and if they are in geographic coordinates (i.e. Latitude/Longitude or "Unprojected"), then you have to option to calculate distances and bearings using geodesic curves in order to get the most accurate measures possible.

CENTROIDS VS. CLOSEST EDGES: You can use this extension can calculate the distance and bearing between the centroids of the series of features as well as the distance and bearing between the closest edges of those features. You can have graphics drawn connecting the centroids and/or the closest edges of each feature in the series.

ALL OR ONLY SELECTED RECORDS: You can either use all the features or only a selected subset of features for the analysis. If any features in the input theme are selected, then only those selected features in that theme will be used when calculating the path. If no features in a theme are selected, then all features in that theme will be used in the analysis.

PROJECTED VS UNPROJECTED VIEWS: If your original data are in Lat/Long coordinates (the Geographic Projection) and your View has been projected, then you have the option of calculating data based on either the Geographic Projection or your View Projection. The choice of projections can dramatically affect distances, bearings and coordinates of nearest edge points.

OUTPUT OPTIONS: You can generate a Results table, a Polyline shapefile representing the entire route, or a Polyline shapefile representing each separate segment along the route, or any combination of these. Each of these options offers a variety of data fields to calculate, reflecting segment ID values, series values, segment lengths, bearings, coordinates and internal angles.

Revision 3.1 repairs a bug in which the internal and deviation angles were reversed.

More detailed operating instructions may be found in the included manual "Find Path.doc", which is in Microsoft Word Format. You may also view an on-line version of this manual at:

http://www.jennessent.com/arcview/path.htm

Please visit the Jenness Enterprises ArcView Extensions site at </P><P>http://www.jennessent.com/arcview/arcview_extensions.htm</P><P> site for more ArcView Extensions and other software by the author.

Enjoy! Please contact the author if you have problems with this extension.
Jeff Jenness...

  the complete description can be found in the readme.txt file included in the zipfile download.</P>
<P>地址：</P><P>http://arcscripts.esri.com/details.asp?dbid=10289</P>

<P>Find the shortest routine linking many points and calculate the path distance</P><P>Summary This script calculates a least cost(distance) path and add the path as a graphic to the specified view. A view with a line theme representing network and a point theme representing or facilities the two themes should be placed at the position preceding the other line and point themes in the table of contents.</P><P>地址：</P><P>http://arcscripts.esri.com/details.asp?dbid=11573</P>