Completion and updating of a Landsat-based land cover polygon layer for Alberta, Canada

Castilla, Guillermo; Hird, Jennifer N.; Hall, Ronald J.; Schieck, Jim; McDermid, Gregory J.

doi:10.1080/07038992.2014.933073

Cited by 10 publications

(17 citation statements)

References 13 publications

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“…(2) Shrubs can be spectrally similar to (and thus confused with) other vegetation types (Castilla et al. ). (3) McDermid et al.…”

Section: Discussionmentioning

confidence: 99%

“…Shrub cover, conversely, was well represented across the samples, but was sampled or interpreted differently in both types of imagery (e.g., due to obstruction by taller trees or confusion with spectrally similar classes) (Castilla et al. ). Wetland was detected in twice as many samples in oblique photographs (42) compared to Landsat (21).…”

Section: Discussionmentioning

confidence: 99%

“…(1) The variable size of pixels in the oblique photographs: 1 m 2 in the midground of an image is represented by more pixels than 1 m 2 in the background, so proportions based on pixel counts could be biased in favor of features that appear in the midground (typically forest). (2) Shrubs can be spectrally similar to (and thus confused with) other vegetation types (Castilla et al 2014).…”

Section: Characterization Of the Modern Landscapementioning

confidence: 99%

“…Similar to mixedwood forest, possible explanations include obstruction of broadleaf trees by coniferous trees in an oblique view, or misclassification of broadleaf forest. Shrub cover, conversely, was well represented across the samples, but was sampled or interpreted differently in both types of imagery (e.g., due to obstruction by taller trees or confusion with spectrally similar classes) (Castilla et al 2014). Wetland was detected in twice as many samples in oblique photographs (42) compared to Landsat (21).…”

Section: Rare Categoriesmentioning

confidence: 99%

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Estimates of landscape composition from terrestrial oblique photographs suggest homogenization of Rocky Mountain landscapes over the last century

Fortin

Fisher

Rhemtulla

et al. 2018

Remote Sens Ecol Conserv

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While orthogonal (i.e., aerial or satellite) imagery has become the more conventional source of land cover data because it can yield spatially accurate land cover maps, terrestrial oblique photographs present a valuable, relatively untapped source of raw optical data for studies of land cover change. We present a case study contrasting how these two types of imagery sample landscape composition and using repeat oblique photographs to evaluate long‐term land cover change in a remote region of the Canadian Rocky Mountains. We classified 46 historical oblique photographs and their corresponding modern repeats using the same discrete land cover classes employed in a Landsat‐based map of the same area. We compared landscape‐level composition estimates from both sources and regressed the land cover proportions from Landsat against the modern oblique images, hypothesizing a linear relationship for most classes. We found that the two sources sampled the landscape in broadly similar ways, with near‐concordance for dominant land cover classes, yet that oblique photographs more frequently detected narrow landscape features and estimated higher proportions of rock compared to satellite imagery, possibly due to the higher spatial resolution of the oblique photographs, and to their angle of incidence against steep slopes. We then evaluated land cover change from corresponding historical and repeat photographs and found that the landscape has homogenized over the past century via increased coniferous forest cover. Our work shows that terrestrial oblique photographs can be used to estimate landscape composition, particularly in mountain environments. This is helpful for analyzing past landscape conditions in historical photographs, monitoring decadal‐span landscape change and assessing habitat to model biodiversity through time.

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“…(2) Shrubs can be spectrally similar to (and thus confused with) other vegetation types (Castilla et al. ). (3) McDermid et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Characterization Of the Modern Landscapementioning

confidence: 99%

Section: Rare Categoriesmentioning

confidence: 99%

See 2 more Smart Citations

Estimates of landscape composition from terrestrial oblique photographs suggest homogenization of Rocky Mountain landscapes over the last century

Fortin

Fisher

Rhemtulla

et al. 2018

Remote Sens Ecol Conserv

View full text Add to dashboard Cite

show abstract

“…However, there was no accuracy assessment provided in this paper. Castilla et al (2014) created a GIS vector layer of land cover polygons for the entire province of Alberta, Canada, based upon pre-existing, Landsat-derived, land cover raster datasets circa 2000. This map was later updated to circa 2010 using Landsat imagery and ancillary GIS information.…”

Section: Introductionmentioning

confidence: 99%

Synergistic use of RADARSAT-2 Ultra Fine and Fine Quad-Pol data to map oilsands infrastructure land: Object-based approach

Jiao

Zhang

Guindon

2015

International Journal of Applied Earth Observation and Geoinfor

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A synthetic review of terrestrial biological research from the Alberta oil sands region: 10 years of published literature

Roberts

Bayne

Beausoleil

et al. 2021

Integr Envir Assess & Manag

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In the past decade, a large volume of peer‐reviewed papers has examined the potential impacts of oil and gas resource extraction in the Canadian oil sands (OS). A large proportion focuses on terrestrial biology: wildlife, birds, and vegetation. We provide a qualitative synthesis of the condition of the environment in the oil sands region (OSR) from 2009 to 2020 to identify gaps and progress cumulative effects assessments. Our objectives were to (1) qualitatively synthesize and critically review knowledge from the OSR; (2) identify consistent trends and generalizable conclusions; and (3) pinpoint gaps in need of greater monitoring or research effort. We visualize knowledge and terrestrial monitoring foci by allocating papers to a conceptual model for the OS. Despite a recent increase in publications, focus has remained concentrated on a few key stressors, especially landscape disturbance, and a few taxa of interest. Stressor and response monitoring is well represented, but direct monitoring of pathways (linkages between stressors and responses) is limited. Important knowledge gaps include understanding effects at multiple spatial scales, mammal health effects monitoring, focused monitoring of local resources important to Indigenous communities, and geospatial coverage and availability, including higher attribute resolution in human footprint, comprehensive land cover mapping, and up‐to‐date LiDAR coverage. Causal attribution based on spatial proximity to operations or spatial orientation of monitoring in the region is common but may be limited in the strength of inference that it provides. Integr Environ Assess Manag 2022;18:388–406. © 2021 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC).

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Completion and updating of a Landsat-based land cover polygon layer for Alberta, Canada

Cited by 10 publications

References 13 publications

Estimates of landscape composition from terrestrial oblique photographs suggest homogenization of Rocky Mountain landscapes over the last century

Estimates of landscape composition from terrestrial oblique photographs suggest homogenization of Rocky Mountain landscapes over the last century

Synergistic use of RADARSAT-2 Ultra Fine and Fine Quad-Pol data to map oilsands infrastructure land: Object-based approach

A synthetic review of terrestrial biological research from the Alberta oil sands region: 10 years of published literature

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