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30 Cards in this Set
- Front
- Back
The first industry-Scaled GISW
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CGIS (Canadian Geographic Information System)
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The man behind the first industry scale-GIS, also known as the father of GIS.
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Roger Tomlinson
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The man responsible for first publishing the concept of the spatial overlay.
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Ian Mcharg
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3 Basic Components of Spatial Data
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Geometry, Topology, Attributes
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A value or property attached to a specific feature
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Attribute
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Using mathematics to express to explicitly code the spatial relationships between objects
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Topology
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Data model using points, lines and polygons to represent spatial data digitally.
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Vector
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A vector data structure without topology
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Cartographic Spaghetti
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Process of converting scanned features into a vector object.
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Digitizing
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In a topological data structure, a directed arc tagged with explicit left and right sides encodes this type of spatial relationship between features.
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Adjacensy
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Data model that conceptualizes spatial features as a surface of equally spaced and equally sized square cells.
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Raster
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A raster data set holds this many attributes
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One
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Aligning a dataset without spatial information to one that has spatial information.
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Georeferencing
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Known coordinate locations used to align the unreferenced image of the source dataset.
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Control Points.
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Minimum number of control points needed to fit an unreferenced image to a source dataset.
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3
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Best pattern for placing control points to ensure a well-referenced image.
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Spread throughout the data
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The 4 ways that an affine transformation warps an unreferenced image to match the source dataset.
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Skew, Rotate, Scale, Translate
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The measure used to indicate the accuracy of your final georeferencing
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RMSE (Root mean square error)
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The spatial overlay that creates a new dataset containing all the features from both input layers
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Union
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Using the field called POPULATION, the expression you would write to select all the cities with more than 5,000,000 people.
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"Population" > 5,000,000
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The boolean operation used to select features that meet both of 2 criteria stated in a query.
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AND
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The term used when 2 layers are combined together in a GIS
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Overlay
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The operation used to determine how many schools are within 2 miles of Terry Park.
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Buffer
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The term used when a new dataset is derived from existing data.
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Geoprocessing
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Component of the attribute table that stores spatial features.
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Rows or Records
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Level of measurement in which the data are grouped by type and then ranked
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Ordinal
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Population, which has a natural zero starting point for measuring, represents this level of measurement
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Ratio
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2 reasons we classify data for mapping.
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Simplify spatial patterns, highlight important aspects of the broader patterns
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Classification method that maximizes the similarity of data values within each class and minimizes the similarity of data values between classes
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Natural Breaks
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The difference between Equal Intervals and Quantiles data classification
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Equal Interval groups values into equal data ranges; Quantiles groups data set values so that each group has the same number of values in it.
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