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Vegetation

Vegetation data describe a collection of plants or plant communities with distinguishable characteristics that occupy an area of interest. Existing vegetation covers or is visible at or above the land or water surface and does not include abiotic factors that tend to describe potential vegetation. 

Source: OMB Circular A–16: Appendix E (2002)

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Variable Distance Buffer

[GIS processing] Variable distance buffer uses a feature attribute from the input to create a ring around the feature that varies in distance.

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Vector Data Model

[data structure] A vector data model is a common GIS feature representation of spatial information based on defining coordinates and attribute information. Vectors are points, polylines and polygons.

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Vertex

[data structure] A vertex is a point that specifies a position on a line. Arcs and polylines are comprised of sets of vertices all interconnected in individual features.

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Vector Format

A data structure for representing point and line data by means of 2- or 3-dimensional geometric (Cartesian x,y or x,y,z) coordinates with exacting topological requirements. In connection with GIS and computer graphics, "vector" can refer to a set of line segments joined end-to-end to make a curved path in space. Vector objects also have a set of attributes (such as ID number, color, drawing style) attached to them.

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Vector element

A vector object is made up of three different types of elements that can have associated attributes 1) points, which are single sets of coordinates that define a point feature (such as a well); 2) lines, which are curvilinear strings of coordinates that define a curved line (such as a stream); and 3) polygons, which are collections of lines that inscribe an area (such as a lake), and a fourth type of element, nodes, which are necessary to maintain vector topology.

1947

Vertical accuracy

Ketepatan menegak

Geospatial

Geomatik

Measure of the positional accuracy of a dataset with respect to a specified vertical datum.
 

Ketepatan kedudukan set data berkenaan dengan datum menegak.
 

716

Vertical coordinate system

Sistem koordinat menegak

Geospatial

Geomatik

One-dimensional coordinate system used for gravity-related height or depth measurements.
 

Sistem koordinat satu dimensi yang digunakan untuk pengukuran ketinggian atau kedalaman yang berkaitan dengan graviti.
 

2381

Vertical reference system

Sistem rujukan menegak

Geospatial

Geomatik

Set of conventions defining the origin, scale, orientation and time evolution that describes the relationship of gravity-related heights or depths to the Earth.
 

Set parameter yang menentukan asalan, skala, orientasi dan evolusi masa yang menggambarkan hubungan ketinggian atau kedalaman berkaitan dengan graviti di Bumi.
 

903

Vocabulary

Perbendaharaan kata

Geospatial

Sistem Maklumat Geografi

Terminological dictionary which contains designations and definitions from one or more specific subject fields.

Himpunan perkataan yang terdapat dalam bahasa yang boleh digunakan oleh pengguna bahasa tersebut.

629

Vertical datum

Datum tegak

Geospatial

Geomatik

Datum describing the relation of gravity-related heights or depths to the Earth.

Sebarang permukaan aras sebenar, di mana kepadanya segala ukuran-ukuran tinggi bagi titik-titik di atas permukaan bumi boleh dirujuk. 

495

Verification test

Ujian pengesahan

Geospatial

Sistem Maklumat Geografi, Geomatik, Penderiaan Jauh, Hidrografi

Test developed to prove rigorously whether an IUT is correct.

Ujian yang dibangunkan untuk membuktikan dengan tepat sama ada IUT betul atau tidak.

1486

Verification

Penentusahan

Geospatial

Sistem Maklumat Geografi, Geomatik, Penderiaan Jauh, Hidrografi

Provision of objective evidence that a given item fulfils specified requirements.

Proses yang menggunakan bukti objektif untuk mengesahkan semua keperluan yang ditentukan telah dipenuhi.