Analytical Methods Flashcards
Contains
Features contain an input polygon
Completely Contains
Features must be completely in an input polygon
Contains Clementini
Features must be completely in the input polygon but if it’s on the boundary, it will not be selected
Within
Features will be selected if completely inside a selecting polygon
Completely Within
Features will be selected if completely within selecting polygon (no overlap)
With Clementini
Features will be selected and cannot be entirely on the boundary of the feature
Are Identical to
Features are identical to input layer
Boundary Touches
Features will be selected if they have a boundary that touches selecting features (must be completely inside or outside the polygon)
Share a Line Segment With
Features selected if they share a line segment
Have Their Center in
Input features will be selected if their center falls within a selecting feature
Crossed by the Outline of
Input features will be selected if they are crossed by the outline of a selecting feature
Contained by
the same with the “Within”
Join
Combine two attribute tables into one using a common key between tables.
Merge
Combines multiple input datasets of the same data type into a single new output
Append
Combines datasets of same data type into an existing dataset
Union
Combines input features with another feature dataset
Clip
Extracts input features that overlay the clip features (keep input attributes)
Intersect
Extracts features which overlap in all layers to new feature class (join attribute tables)
Classification
Equal range, quantiles, standard deviations, and natural breaks
Equal range
equal distance between the class breaks
Quantile
Equal number of observations in each class
Standard Deviations
Class breaks based on distance of standard deviations from the mean
Natural Breaks
Class breaks conform to gaps in data distribution
Spatial Overlay
Process of superimposing layers of geographic data that cover the same area to study the relationship between them.
Overlay
Two or more maps or layers are superimposed for showing relationships between features
Vector Overlay Tools
Identity; intersect; symmetrical difference, union, update
Identity
Input features, split by overlay features
Intersect
Only features common to all input layers
Symmetrical Difference
Features common to either input layer or overlay, but not both
Union
All input features
Update
Input feature geometry replaced by update layer
Raster Overlay Tools
Zonal statistics combine, single output map algebra, weighted overlay, and weighted sum.
Zonal Statistics
Summarizes values in a raster layer by zone (categories) in another layer; For example, calculate the mean elevation for each vegetation category.
Combine
Assigns a value to each cell in the output layer based on unique combinations of values from several input layers.
Single Output Map Algebra
Let you combine multiple raster layer by using an expression you enter; For example, you can add several ranked layers to create an overall ranking.
Weighted Overlay
Automates the raster overlay process and let you assign weights to each layer before adding
Weighted Sum
Overlays several rasters multiply each by their given weight and sum them together
Map Algebra
Various functions performed on cells based on neighboring cells for raster datasets.
Local operations
Combine rasters that ovelay each other
Global operations
apply a formula to all cells
Focal operations
calculates a value based on all neighboring cells
Zonal operations
computing a value based on cells in a particular zone
Descriptive statistics
The discipline of quantitatively describing the main features of a collection of information (e.g. summarizing a sample to learn about the population)
Summary statistics
Used to summarize a set of observations
