CRWR-Vector v.1.1

An ArcView Extension for Analysis of Vector Data


INSTRUCTIONS:
ArcView extension file: vector11.avx is located in the folder software / crwron this CD-ROM
Copy this file into your ARCVIEW / EXT32 folder on your computer
Open ArcView and select CRWR-Vector from the File | Extensions menu
see instructions on how to generate Thiessen Polygons

Extension developed by : Francisco Olivera
Scripts modified by : Francisco Olivera
Date : April 13, 1999
Extension file name : VECTOR11.AVX
Instructions file name : VECTOR11.HTM
The CRWR Vector extension adds a pull-down menu in the menu list of the View documents.


Menu: CRWR-Vector


PROJECT

Input themes:

Output : One (or more) projected feature theme(s)

Methodology : Projects the feature theme(s) from the source projection to geographic projection, and then from geographic projection to the target projection. If the view units are decimal degrees, the source projection is taken as geographic. Note: The number of projection systems supported by ArcView Project is less than that supported by Arc/Info.


FISHNET

Input themes: None

Output : Polygon theme (fishnet)

Methodology : Creates a polygon theme of rectangles with the shape of a fishnet. The user is prompt for the size of the fishnet, and for the number of rows and columns.


THEISSEN POLYGONS

Input themes:

Output : Polygon theme (Theissen polygons)

Methodology : Builds Theissen polygons from a point theme. A boundary polygon can be used from another theme or one can be generated from the convex hull of the points.


CLIP BY GRAPHIC

Input themes:

Output : Feature theme

Methodology : Clips out the part of the feature theme that falls within the selected graphic. Attributes are transferred, but areas, perimeters and lengths are not updated.


POLYGONS TO POLYLINES

Input themes:

Output : Polyline theme

Methodology : Converts selected polygons to polylines and creates a new shapefile. If no features are selected all polygons are processed.


POLY TO POLY PROPERTY TRANSFER

Input themes:

Output : Modified target-polygon-theme attribute table with a new field.

Methodology : Adds a new field in the attribute table of the target polygon theme, and populates it with area-weighted average or most frequent values of a property defined in a source theme.


UPDATE FEATURE GEOMETRY

Input themes:

Output : Updated attribute table of the active polygon or polyline theme(s).

Methodology : Adds or updates area and perimeter fields in the attribute table of active polygon theme(s), and adds or updates length field in the attribute table of active polyline theme(s).


ADD XY TO TABLE

Input themes:

Output : Two new fields in the attribute table of the active theme.

Methodology : Calculates the XY coordinates of the selected points of the point theme, or the centroid of the selected polygons of the polygon theme, and stores theme in two new fields of the attribute table.


ADD RECORD NUMBER TO TABLE

Input themes:

Output : New field in the attribute table of the feature theme.

Methodology : Adds a field to the attribute table of the feature theme and populates it with the record number.


Francisco Olivera, Ph.D.
Assistant Professor
Texas A&M University
Department of Civil Engineering
Tel.: 979-845-1404
FAX: 979-862-1542
e-mail: folivera@civilmail.tamu.edu