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CEDRA GridAQuadrilateralTM is
an ArcView® GIS and ArcGIS® extension that is included
with all of the CEDRA AVseriesTM
software and enables the user to subdivide quadrilaterals by specifying
the number of rows and columns that are desired. This is an ideal
tool for those involved with quarter-quarter sections or Aliquot
parts. For ArcGIS users, the [Aliquot Polygon]
command within the CEDRA-Aliquot-Tools
toolbar provides additional functionality for transcribing Aliquot
descriptions thereby facilitating the generation of polygon features,
which represent an Aliquot description.
CEDRA-GridAQuadrilateralTM
CEDRA-GridAQuadrilateralTM
is an ArcView® GIS and ArcGIS® extension that enables
the user to subdivide a polyline or polygon
feature, which represents a four sided figure, by specifying
the number of rows and columns. In addition, the user is able
to create: (a) point features at the vertices of the polygons,
(b) line segments that represent the sides of the polygons and
(c) a polyline that represents the outline of the polygon. No
duplicate point or line features are created. Every polygon that
is created is assigned a unique identification number and carries
as attributes its area and perimeter.
The polyline or polygon that is selected for subdividing does
not have to form a perfect rectangle, but rather, can represent
any four-sided figure (quadrilateral). There is no limit to the
number of rows and columns that can be specified.
CEDRA-Aliquot-Tools ToolbarTM
The basic concept in an Aliquot description is to take a large
polygon, which typically represents a section in a grid system,
and subdivide it one or more times into a smaller polygon by using
various combinations of quadrant identifiers such as NE, SE, SW,
NW, N2, E2, E2W2 and so forth. The result of one quadrant identifier
serves as the starting point for the next quadrant identifier.
The [Aliquot Polygon] command within
the CEDRA-Aliquot-Tools toolbar provides the user the ability
to transcribe or decipher an Aliquot description thereby facilitating
the generation of polygon features which are defined in terms
of Aliquot quadrant identifiers.
The supported Quadrant Identifiers include the following:
' ----------------------------- ----------------------------- -----------------------------
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' | NWNW | NENW |
NWNE | NENE | |
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' |---------------------------| | NW | NE |
| N2 |
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' | SWNW | SENW |
SWNE | SENE | |
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' |---------------------------| |---------------------------| |---------------------------|
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' | NWSW | NESW |
NWSE | NESE | |
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' |---------------------------| | SW | SE |
| S2 |
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' | SWSW | SESW |
SWSE | SESE | |
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' ----------------------------- -----------------------------
-----------------------------
' ----------------------------- ----------------------------- -----------------------------
' |
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| N2NW | N2NE
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' |
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|---------------------------| | W2NW | E2NW | W2NE | E2NE
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| S2NW | S2NE
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' |
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' | W2 | E2 |
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' |
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| N2SW | N2SE
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|---------------------------| | W2SW |
E2SW | W2SE |
E2SE |
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' |
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| S2SE
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' ----------------------------- -----------------------------
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' ----------------------------- -----------------------------
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' | N2N2 |
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' |---------------------------| |
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' | |
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' | S2N2 |
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' |---------------------------| | W2W2 |
E2W2 | W2E2 |
E2E2 |
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' | N2S2 |
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' | |
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' |---------------------------| |
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' | |
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' | S2S2 |
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' ----------------------------- -----------------------------
In addition to the Quadrant Identifiers, the user is able to
specify any of the Strip Identifiers, North, South, East and West
to extract a strip or portion of land from a quadrilateral. When
specifying a strip identifier, the user enters a strip width value
indicating the amount of land to be extracted.
' ----------------------------- -----------------------------
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| NORTH |
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| WEST |
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| EAST |
' | |
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' |---------------------------| | |
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' | SOUTH |
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' ----------------------------- -----------------------------
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For more information on CEDRATM software and services contact The CEDRA Corporation at 151 Sully's Trail - Suite 6, Pittsford, New York 14534, phone: 585-232-6998, fax: 585-262-2042 or Send E-mail to CEDRA: cedra@cedra.com
![[Aliquot Polygon]](GRDQUAD4.GIF){kind=link}