Environmental Modeling Application of Suitability Index.

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Presentation transcript:

Environmental Modeling Application of Suitability Index

1. The Issue ► ► To simulate caribou migration of the Paleo-Indian period to validate locations of archaeological sites, in order to understand the Paleo-Indian hunting activities ► ► Archaeological data are scarce, and GIS gives additional evidence ► Krist, F.J., and D. G. Brown, GIS modeling of paleo-Indian period Caribu migrations and viewsheds in Northern Lower Michigan. Photogrammetric Engineering and Remote Sensing, 60(9):

2. 2. Major Factors : ► ► Where caribou are Caribou can be intercepted at natural traps or from watercraft at lacustrine or riverine environments ► ► Where people are People live near waters: lake benches, beaches, shallow bays, lagoons, lake inlets or outlets, lake beds, shorelines

3. 3. Major Factors.. ► ► How caribou move Follow contours in hilly areas e.g. ridgelines, valley bottom, gentle slopes, and hillsides Pass water bodies e.g. lakes, swamps, rivers, creeks, etc.

4. Data ► ► Slope angle (15 classes) and slope aspect (10 classes) - Contour maps ► ► Lakes, swamps, creeks, marshes, lake inlets and outlets - 1:24,000 quadrangles ► ► Swamps - Soil maps ► ► Ancient lakes - Contour maps (10ft interval) ► ► Archaeological sites - Field survey

5. Operation - 5. Operation - Simulating Migration Pathways ► Friction Surface - Terrain factors - Hydrography factors

Friction Surface

Travel Time Calculation

Friction Surface Friction Surface Data Layer Start Point Data Layer Cumulative Travel Time Data Layer

Friction Surface

Friction Surface - Terrain Factors ► Evaluated based in travel directions, NW or SE - Slope angle - Slope angle - Slope aspect - Slope aspect to represent uphill, down hill, and slope side Scores 0-100

Terrain Factors

Friction surface - Hydrography Factors ► ► Relative barriers - lakes (120) vs. swamps (80) - rivers (160) vs. creeks (107) - deep water (240), intermediate (200), shallow (120) ► ► Hydrography barriers are deemed more difficult than terrain factors

Friction Surface

Optimal Routes ► ► Compute the cumulative travel cost from 8 starting points to determine the most likely migration trails

Terrain Factors

6. Operation - Viewshed Analysis ► ► To evaluate the relationship between the location of the archaeological sites and the routes: Viewshed (vs. buffer) - from the highest point within 0.4km of each site - view height 1.4m above the ground

Viewshed analysis Line of sight n

Viewshed The above maps show the results of analyses around Saddleback (left) and Old Blue (right) mountains. On the maps, green areas are visible from the location cited (shown in yellow), while gray areas are obstructed from view. The Appalachian Trail is shown in red.

Terrain Factors

7. Results ► ► Several migration routes converged near the three sites ► ► Each site has visibility of (1) lowland bordering rivers (2) visibility of caribou migration trails, and (3) natural features to divert caribou to traps or to intercept caribou near creeks/river valleys

8. 8. Further Development ► ► Need more archaeological data ► ► Test against modern caribou trails ► ► Spatial analysis for other human activities