Free satellite imagery and digital elevation model analyses enabling natural resource management in the developing world: Case studies from Eastern Indonesia

Fisher, Rohan; Hobgen, Sarah Elizabeth; Haleberek, Kristianus; Sula, Nelson; Mandaya, Iradaf

doi:10.1111/sjtg.12210

Cited by 9 publications

(6 citation statements)

References 40 publications

(47 reference statements)

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“…The use of UAV imagery to assess canopy cover is usually recommended only if a detailed terrain model is available, since the DSM only penetrates the terrain if there are gaps in the forest [32], as dense canopies limit the assessment of under-story objects . In Argentina, the available DTM has a resolution of 30 m/pixel with an error of 3 m in altitude, which is far less precise than those of lower than 1 m horizontal and 0.15 m vertical resolutions in some developed countries [26,77]. However, from this research, a step forward in the assessment of fire-induced open forest areas was achieved.…”

Section: Discussionmentioning

confidence: 90%

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Combining Satellite and UAV Imagery to Delineate Forest Cover and Basal Area after Mixed-Severity Fires

2018

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In northern Argentina, the assessment of degraded forests is a big challenge for both science and practice, due to their heterogeneous structure. However, new technologies could contribute to mapping post-disturbance canopy cover and basal area in detail. Therefore, this research assesses whether or not the inclusion of partial cover unmanned aerial vehicle imagery could reduce the classification error of a SPOT6 image used in an area-based inventory. BA was calculated from 77 ground inventory plots over 3944 ha of a forest affected by mixed-severity fires in the Argentinian Yungas. In total, 74% of the area was covered with UAV flights, and canopy height models were calculated to estimate partial canopy cover at three tree height classes. Basal area and partial canopy cover were used to formulate the adjusted canopy cover index, and it was calculated for 70 ground plots and an additional 20 image plots. Four classes of fire severity were created based on basal area and adjusted canopy cover index, and were used to run two supervised classifications over a segmented (algorithm multiresolution) wall-to-wall SPOT6 image. The comparison of the Cohan’s Kappa coefficient of both classifications shows that they are not significantly different (p-value: 0.43). However, the approach based on the adjusted canopy cover index achieved more homogeneous strata (Welch t-test with 95% of confidence). Additionally, UAV-derived canopy height model estimates of tree height were compared with field measurements of 71 alive trees. The canopy height models underestimated tree height with an RMSE ranging from 2.8 to 8.3 m. The best accuracy of the canopy height model was achieved using a larger pixel size (10 m), and for lower stocked plots due to high fire severity.

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Section: Discussionmentioning

confidence: 90%

“…Attempts to assess canopy opening caused by selective logging [20][21][22] and wildfire [23][24][25] have been made with different satellite sensors [26,27]. However, those approaches have their limitations with respect to possible ground resolution, frequent cloud cover, and costs of the imagery [28,29].…”

Section: Introductionmentioning

confidence: 99%

Combining Satellite and UAV Imagery to Delineate Forest Cover and Basal Area after Mixed-Severity Fires

2018

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“…As noted in prior Editorials (Bunnell & Lu, 2016; Lu & Bunnell, 2018) the SJTG is equally receptive to physical and human geography, as well as to papers that span these fields. Amongst the https://onlinelibrary.wiley.com/page/journal/14679493/homepage/best_paper_prize.htm of the best paper award in recent years was another multi‐authored paper (Fisher et al ., 2018) based on an Indonesian case study that draws on open access satellite imagery and digital elevation modelling to study natural resource management.…”

Section: Category Best Graduate Student Paper Best Overall Papermentioning

confidence: 99%

Editorial: Decolonial Tropical Geographies?

Sidaway

Chang

Feng

et al. 2021

Singap J Trop Geogr

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“…In an era in which geography as a discipline is increasingly grappling with the powers of visual agendas and imagery in public socioenvironmental debates (Thomsen 2015;Burke, Ockwell, and Whitmarsh 2018), recent geographical scholarship on mining landscapes and remote sensing has advocated making satellite images more accessible, free, and better linked to local knowledge and government decision making (Fisher et al 2017). Especially with geographers dedicating vast amounts of attention and resources to remote sensing, questions about other forms of visualization and philosophical questions about the nature of photography itself are exceedingly important: What kinds of nonaerial photos matter in a given context and for what reasons?…”

Section: Geographies Of Photo Making and (Dis)connection: From Landscmentioning

confidence: 99%

Visual Storytelling and Socioenvironmental Change: Images, Photographic Encounters, and Knowledge Construction in Resource Frontiers

Spiegel

2019

Annals of the American Association of Geographers

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Practices of visually representing places of resource extraction and land degradation can be deeply contentious, embedded in a wide variety of values, ethics, goals, and relations. Photographs are pervasively used to generate narratives about environmental change, particular social groups, and places. Yet, the sociocultural processes and power relations at play in producing "visual knowledge" and interpreting images often remain underexplored, with limited attention to how photographs and visual storytelling are engaged to (re)orient discussions about change. Challenging ways of seeing, this article discusses relational practices around photography and the narrating, experiencing, and circulating of images. It explores experiences with photovoice-a methodology aimed at realigning the dynamics of who decides what photos matter, how, why, and with what implications, sometimes pitched as a way to "decolonize" research. The study examines interactions in a village in Central Kalimantan, Indonesia, where women shared visual stories to express challenges they face in relation to deforestation and other landscape changes, depleted gold deposits, limited livelihood options, and other themes, conveying place histories and ideas about home, identity, governance, and community. Reflecting on intergenerational dialogues and anxieties about the future, the analysis considers photovoice processes in refracting everyday struggles, arguing for feminist epistemologies that carefully attend to the situated ethics and contingent performative powers of visual storytelling where multiple forms of resource extraction powerfully shape community life. The article calls for greater focus on women's place-based storytelling and its communicative power, highlighting the significance of positionality when studying socioecological visualization, affect, and change.

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Free satellite imagery and digital elevation model analyses enabling natural resource management in the developing world: Case studies from Eastern Indonesia

Cited by 9 publications

References 40 publications

Combining Satellite and UAV Imagery to Delineate Forest Cover and Basal Area after Mixed-Severity Fires

Combining Satellite and UAV Imagery to Delineate Forest Cover and Basal Area after Mixed-Severity Fires

Editorial: Decolonial Tropical Geographies?

Visual Storytelling and Socioenvironmental Change: Images, Photographic Encounters, and Knowledge Construction in Resource Frontiers

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