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Esri: Getting Started with GIS
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Esri: Getting Started with GIS
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Esri: Getting Started with GISattribute query Answer - Request for features based on values in the attribute table.
The three basic components of an attribute query are the attribute field, operator,
and attribute value.
feature Answer - A representation of a real-world object on a GIS map.
geographic coordinates Answer - A measurement of a location on the earth's surface
expressed in degrees of latitude and longitude.
GIS Answer - Acronym for geographic information system. An integrated system of
data, software, hardware, people and workflows used to answer questions, make
decisions, and provide tools to create, share, and use geographic information.
layer Answer - References GIS data that represents real world features. The layer
creates a symbol to represent the collection of these features. The features in a layer
have the same theme, geometry, and set of attributes.
location query Answer - Request for features based on the location and spatial
relationship to other features. The three basic components of a location query are
the layer containing features to select, the location relationship, and the layer
containing the related features.
metadata Answer - Information that describes the content, quality, condition, origin,
and other characteristics of data.
raster Answer - A data model that defines surfaces as an array of equally sized cells
arranged in rows and columns. Each cell contains an attribute or measurement
value. A raster's origin, cell size, and relative cell location are used to determine the
location of the cells and raster on the earth.
scale Answer - Relationship between the size of a feature on a map and the actual
size of that feature in the real world. Scales can be expressed as a ratio or an
equivalence.
vector Answer - A data model that represents geographic features as points,
polylines, and polygons. Attributes are associated with each vector feature, as
opposed to a raster data model, which associates attributes with grid cells. Vector
data uses pairs of geographic coordinates to determine the location of the features
on the earth.
Points Answer - Points are a single XY coordinate location. This image illustrates the
points used to represent trees. Each point has a longitude and latitude location (also
referred to as geographic coordinates) that defines the precise location of the feature
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