Raster Modeling of Indicator Plant Species for Monitoring Restoration
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Transcript of Raster Modeling of Indicator Plant Species for Monitoring Restoration
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Raster Modeling of Indicator Plant Species for Monitoring Restoration
of the Longleaf Pine Ecosystem
Michael RasserUniversity of Texas Marine Science Institute
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The Problem
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Restoration of Longleaf Pine• Prescribed Fire
• Planting of Longleaf Seedlings
• Restoration of ground cover
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Objectives
• Test the efficacy of using the geostatistical analyst to interpolate surfaces of species distribution based on point data.
• Generate distribution maps for 7 indicator species important for monitoring restoration success.
• Create a map that can be used to prioritize areas for restoration.
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Study Site
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Previous Land Use
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Methodology
1. Geo-reference data from relational database with sample point locations
2. Determine appropriate geostatistical model to interpolate point layer into raster surface
3. Create grid surfaces for each of the indicator species.
4. Create a map of “ecological integrity” that can be used to prioritize restoration areas.
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Data• Biological Communities Map
(.shp)
• Vegetation Sampling Database (MS access)
• Property Boundary (.shp)
• Sample Point Locations (.shp)
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Georeferencing of Tabular Data
MS ACCESS
ARCGIS Attribute Table
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Testing of Geostatistical Models
Model Validation
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Testing of Geostatistical Models Species RMS Prediction Error
Kriging IDW
Longleaf Pine 15.02 15.44
Turkey Oak 6.592 6.946
Laurel Oak 10.4 11.64
Black Cherry 0.6105 0.5965
Wire Grass 10.4 11.64
Winged Sumac 12.89 13.15
Cross Validation
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Creation of Species Maps
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Raster Calculations
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Development of Ecological Integrity Map
Combined 4 species negatively associated with ecological quantityby creating a new raster layer with the mean value.
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Reclassification of Cell Values
Legend
piparanked
VALUE
1
2
3
4
5
6
7
8
9
10
Legend
PIPA
ValueHigh : 32.495926
Low : 0.000000
Reclassified 5 layers
Woody SpeciesWire GrassLongleaf PineTurkey Oak
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Creation of Weighted Raster Layer for Ecological Integrity
• Weighted species based on Importance
• Reclassified after weighting to create 0 – 10 scale
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Incorporated Existing Biological Community Map
Convert Grid to shapefileClip shapefile with existing biological communities shapefile to exclude all but longleaf pine community
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