Spatial Pattern Analysis Exploring the relationship between ecological pattern, ecological function...
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Spatial Pattern AnalysisSpatial Pattern Analysis
Exploring the relationship between ecological pattern, ecological function and ecological processes.
Spatial Structure -> Ecological Function -> Change …. pressure, state, response
CompositionComposition ConfigurationConfiguration
Spatial StructureSpatial Structure
www.mosaicr.com
Assess PatternAssess Pattern
Input = classified input Output = spreadsheet of selected metrics
• Composition = The presence and amount of each element type without spatially explicit measures.– Proportion, richness, evenness, diversity
• Configuration = The physical distribution in space and spatial character of elements.– Isolation, placement, adjacency
Spatial StructureSpatial Structure
Rugosity
Jeff Jenness and Pat Iampietro
3 band “true color”Red, Green, Blue;
1 band, Red wavelength
5 class Natural breaksJenk’s classifier
5 class Equal Intervalequal-sized sub-ranges
11 class (1/2 equal Interval)
Defined IntervalAn interval which equallyDivides a range
5 class QuantileEach class has equal Number of features
5 class Quantile1 standarddeviation
5 class, “isodata”R,G,B,IR
Histogram ClassificationHistogram Classification
original continuous data
Various histogram classification results
Multi
Clustering MultivariateSpatial DataClustering MultivariateSpatial Data
Clusters
ISODATA clusters
Inner radiusOuter radius
Classification
Ridge
Upper Slope
Middle Slope
Flat
Lower Slope
Valley
3 “patches”Same “class”
1 “patches”differ “class”
1 “landscape”
Types of Metrics• Area, Density, Diversity• Shape• Core area• Isolation/proximity, Nearest-Neighbor• Contrast metrics• Contagion / Interspersion• Connectivity• Diversity
Area, Density, Diversity Metrics
Patch Density
Shannon Diversity Index
Fractal: a pattern composed of identical parts
Shape Metricsperimeter-area relationships
• Shape Index (SHAPE) -- complexity of patch compared to standard shape – vector uses circular; raster uses square– Mean Shape Index (MSI) = perimeter-to-area
ratio– Area-Weighted Mean Shape Index (AWMSI)– Landscape Shape Index (LSI)
fractal dimension indicates the extent to which the fractal object fills the Euclidean dimension
Fractal Dimension (D), or (FRACT)
- log P = 1/2D*log A; P = perimeter, A = area
E = total edgeA = total area
Contagion, Interspersion and Juxtaposition
• When first proposed (O’Neill 1988) proved incorrect, Li & Reynolds (1993) alternative• Based upon the product of two (2) probabilities
– Randomly chosen cell belongs to patch “i”– Conditional probability of given type “i” neighboring cells belongs to “j”
• Interspersion (the intermixing of units of different patch types) and Juxtaposition (the mix of different types being adjacent) index (IJI)
M = number of classesEik = length of edge between classes
Landscape Metrics
Class Metrics
Number of Patches
Largest Patch
Area-weighted mean shape
Shannon’s Diversity
Interspersion
Percent of Landscape | Patch Density | Patch Size CV | Area-weighted Mean Shape
4
89
1.45
.69
30.2
10 2 0 1.30
1 1 0 1 89 1 0 1.60
5
32
1.85
1.10
40
27 3 4 1.5
4 2 .25 1.12
69 5 4 1.87
19
13
?
?
?
? ? ? ?
1
100
1
0
0
Landscape Ecology
• Structure = the spatial relationships among the distinctive ecosystems or “elements”
• Function = the interactions among the spatial elements
• Change = the alteration in the structure and function of the ecological mosaic over time
Landscape Structure Physiognomy / Pattern
• Composition = The presence and amount of each element type without spatially explicit measures.– Proportion, richness, evenness, diversity
• Configuration = The physical distribution in space and spatial character of elements.– Isolation, placement, adjacency
• ** some metrics do both **
Types of Metics
• Area Metrics• Patch Density, Size and Variability• Edge Metrics• Shape Metrics• Core Area Metrics• Nearest-Neighbor Metrics• Diversity Metrics• Contagion and Interspersion Metrics
Shape Metricsperimeter-area relationships
• Shape Index (SHAPE) -- complexity of patch compared to standard shape – vector uses circular; raster uses square– Mean Shape Index (MSI) = perimeter-to-area ratio
– Area-Weighted Mean Shape Index (AWMSI)– Landscape Shape Index (LSI)
• Fractal Dimension (D), or (FRACT) – log P = 1/2D*log A; P = perimeter, A = area– P = sq.rt. A raised to D, and D = 1 (a line)– as polygons move to complexity P = A, and D -> 2– A few fractal metrics
• Double log fractal dimension (DLFD)• Mean patch fractal (MPFD)• Area-weighted mean patch fractal dimension (AWMPFD)
Contagion, Interspersion and Juxtaposition
• When first proposed (O’Neill 1988) proved incorrect, Li & Reynolds (1993) alternative
• Based upon the product of two (2) probabilities– Randomly chosen cell belongs to patch “i”– Conditional probability of given type “i” neighboring
cells belongs to “j”
• Interspersion (the intermixing of units of different patch types) and Juxtaposition (the mix of different types being adjacent) index (IJI)