Relasphone - Mobile and Participative In Situ Forest Biomass Measurements Supporting Satellite Image Mapping

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http://hdl.handle.net/10138/169885

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Molinier , M , Lopez-Sanchez , C A , Toivanen , T , Korpela , I , Corral-Rivas , J J , Tergujeff , R & Häme , T 2016 , ' Relasphone - Mobile and Participative In Situ Forest Biomass Measurements Supporting Satellite Image Mapping ' , Remote Sensing , vol. 8 , no. 10 , 869 . https://doi.org/10.3390/rs8100869

Title: Relasphone - Mobile and Participative In Situ Forest Biomass Measurements Supporting Satellite Image Mapping
Author: Molinier, Matthieu; Lopez-Sanchez, Carlos A.; Toivanen, Timo; Korpela, Ilkka; Corral-Rivas, Jose J.; Tergujeff, Renne; Häme, Tuomas
Contributor organization: Department of Forest Sciences
Ilkka Korpela / Principal Investigator
Forest Ecology and Management
Date: 2016-10
Language: eng
Number of pages: 23
Belongs to series: Remote Sensing
ISSN: 2072-4292
DOI: https://doi.org/10.3390/rs8100869
URI: http://hdl.handle.net/10138/169885
Abstract: Due to the high cost of traditional forest plot measurements, the availability of up-to-date in situ forest inventory data has been a bottleneck for remote sensing image analysis in support of the important global forest biomass mapping. Capitalizing on the proliferation of smartphones, citizen science is a promising approach to increase spatial and temporal coverages of in situ forest observations in a cost-effective way. Digital cameras can be used as a relascope device to measure basal area, a forest density variable that is closely related to biomass. In this paper, we present the Relasphone mobile application with extensive accuracy assessment in two mixed forest sites from different biomes. Basal area measurements in Finland ( boreal zone) were in good agreement with reference forest inventory plot data on pine ( R-2 = 0.75, RMSE = 5.33 m(2)/ha), spruce ( R-2 = 0.75, RMSE = 6.73 m(2)/ha) and birch ( R-2 = 0.71, RMSE = 4.98 m(2)/ha), with total relative RMSE ( %) = 29.66%. In Durango, Mexico ( temperate zone), Relasphone stem volume measurements were best for pine ( R-2 = 0.88, RMSE = 32.46 m(3)/ha) and total stem volume ( R-2 = 0.87, RMSE = 35.21 m(3)/ha). Relasphone data were then successfully utilized as the only reference data in combination with optical satellite images to produce biomass maps. The Relasphone concept has been validated for future use by citizens in other locations.
Subject: citizen science
participatory sensing
digital relascope
basal area
optical satellite images
aboveground forest biomass
growing stock volume
digital camera
smartphone app
VOLUNTEERED GEOGRAPHIC INFORMATION
TREE SPECIES CLASSIFICATION
EUROPEAN BOREAL FOREST
GROUND-BASED LIDAR
LAND-COVER
TROPICAL FORESTS
CITIZEN SCIENCE
COMBINING SATELLITE
AIRBORNE LIDAR
ACCURACY
4112 Forestry
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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