Rocky Mountain and foothills landscapes Wheeler Irrigation Survey, - - PowerPoint PPT Presentation

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Rocky Mountain and foothills landscapes Wheeler Irrigation Survey, - - PowerPoint PPT Presentation

Jan 16, 2024 268 likes •811 views

Georeferencing oblique landscape photos to evaluate century-scale changes in the structure of Rocky Mountain and foothills landscapes Wheeler Irrigation Survey, 1895-1897 Chris Stockdale - PhD Candidate Committee Ellen Macdonald - supervisor

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Georeferencing oblique landscape photos to evaluate century-scale changes in the structure of Rocky Mountain and foothills landscapes

Wheeler Irrigation Survey, 1895-1897 Higgs, 2009 Chris Stockdale - PhD Candidate Committee Ellen Macdonald - supervisor Mike Flannigan Eric Higgs April 25, 2014 Banff AB Mountain Cartography Workshop

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History

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Planning for the future without knowledge of the past is inherently riskier than the alternative.

“We are more likely to use the present to attempt to reconstruct the past, than we are to use the past to understand the present and guide the future.”

  • Stephen Pyne
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From: Swetnam et al. 1999. Applied Historical Ecology: Using the past to manage for the future

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From: Swetnam et al. 1999. Applied Historical Ecology: Using the past to manage for the future

FOREST MANAGEMENT

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1949

Wheeler 1895 Higgs, 2009

1885 MLP Canada-wide aerial photography 1939 – southern Alberta

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1949

Wheeler 1895 Higgs, 2009

1885 MLP Canada-wide aerial photography 1939 – southern Alberta

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1949

Wheeler 1895 Higgs, 2009 Requirements?

  • Photographs taken at nadir
  • Every pixel = same area*
  • Lots of software tools available
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Rubbersheeting Can’t interpret vegetation after georeferencing

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Bridgland, 1913

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From: C. Bozzini, M. Conedera, P. Krebs 2012. A New Monoplotting Tool to Extract Georeferenced Vector Data and Orthorectified Raster Data from Oblique Non-Metric Photographs. International Journal of Heritage in the Digital Era

Digital Monoplotting for Georeferencing Oblique Photography

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ACCURACY TEST

  • 1. 8 images used
  • 2. 21 control points established in each image
  • 3. 6 Anchor Points used to georeference the image
  • 4. Remaining 15 control points (TEST points) are georeferenced

in Monoplotting tool

  • 5. Locations compared to Control Point
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ACCURACY TEST

  • 1. 8 images used
  • 2. 21 control points established in each image
  • 3. 6 Anchor Points used to georeference the image
  • 4. Remaining 15 control points (TEST points) are georeferenced

in Monoplotting tool

  • 5. Locations compared to Control Point
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1.

Polygon based approach

2.

Raster based approach

3.

Hybrid polygon/raster

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Classify vegetation in plots in Monoplotting Tool

NOTE: Oblique view, MLP image

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Export spatially referenced objects to ArcGIS (or other GIS)

NOTE: Orthogonal view in GIS

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NOTE: Orthogonal view in GIS overlain on Orthophoto

  • f same time as MLP image
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MLP image

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Ortho image of same region

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Viewshed Analysis of image showing what part

  • f landscape is visible in

photograph

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30m grid

Insert spatially referenced grid in Visible landscape

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30 m 30 m 30 m 30 m 30 m 30 m 30 m 30 m 30 30 m 30 m 30 m 30 m

Export spatially referenced grid to Monoplotting tool for classification of 2009 image

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1899 image with grid

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1899

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1899 2009

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Initial Final

Grass Shrub Decid. Mixed Conif er Grass

  • 1
  • 2
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Shrub

1

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Deciduous

2 1

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Mixed

3 2 1

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Conifer

4 3 2 1 Table 1: Vegetation Transition Matrix

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Initial Final

Grass Shrub Decid. Mixed Conif er Grass

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Shrub

1

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Deciduous

2 1

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Mixed

3 2 1

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Conifer

4 3 2 1 Table 1: Vegetation Transition Matrix Figure 1: Raster “change” surface

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250m 250m 250m 250m 250m 250m

Put plots on landscape

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1913 2009

Is 1913 more variable than 2009? Patch sizes, edge to interior, # of patches, fractal dimension, contagion, TPSA Has the leading tree species of the forest changed? Where? Is this to more or less advanced successional species? Is the forest more dense (stem density) in 2009 than 1913? Where is this observed? What were the original conditions? Is the age class distribution of the forest older and more homogenous?

Note: Mock classified imagery

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Primary Funding Sources Additional Funding Sources In-Kind Support

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  • Bridgland 1912-1913
  • Wheeler 1895-1899
  • Total 1462 Image

pairs

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5 km viewshed from all photos

Choose area with extensive view coverage

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Beaver Mines West Castle Castle Waterton Lakes NP