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Remote Sens. 2014, 6(3), 2134-2153; doi:10.3390/rs6032134

Artificial Neural Network Modeling of High Arctic Phytomass Using Synthetic Aperture Radar and Multispectral Data

1,* , 1
1 Department of Geography, Queen's University, Kingston, ON K7L 3N6, Canada 2 Canada Centre for Remote Sensing, Natural Resources Canada, 588 Booth Street, Ottawa, ON K1A 0Y7, Canada 3 Department of Geography, Ryerson University, 350 Victoria St., Toronto, ON M5B 2K3, Canada
* Author to whom correspondence should be addressed.
Received: 3 November 2013 / Revised: 10 February 2014 / Accepted: 27 February 2014 / Published: 7 March 2014
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Vegetation in the Arctic is often sparse, spatially heterogeneous, and difficult to model. Synthetic Aperture Radar (SAR) has shown some promise in above-ground phytomass estimation at sub-arctic latitudes, but the utility of this type of data is not known in the context of the unique environments of the Canadian High Arctic. In this paper, Artificial Neural Networks (ANNs) were created to model the relationship between variables derived from high resolution multi-incidence angle RADARSAT-2 SAR data and optically-derived (GeoEye-1) Soil Adjusted Vegetation Index (SAVI) values. The modeled SAVI values (i.e., from SAR variables) were then used to create maps of above-ground phytomass across the study area. SAVI model results for individual ecological classes of polar semi-desert, mesic heath, wet sedge, and felsenmeer were reasonable, with r2 values of 0.43, 0.43, 0.30, and 0.59, respectively. When the outputs of these models were combined to analyze the relationship between the model output and SAVI as a group, the r2 value was 0.60, with an 8% normalized root mean square error (% of the total range of phytomass values), a positive indicator of a relationship. The above-ground phytomass model also resulted in a very strong relationship (r2 = 0.87) between SAR-modeled and field-measured phytomass. A positive relationship was also found between optically derived SAVI values and field measured phytomass (r2 = 0.79). These relationships demonstrate the utility of SAR data, compared to using optical data alone, for modeling above-ground phytomass in a high arctic environment possessing relatively low levels of vegetation.
Keywords: Arctic; synthetic aperture radar; phytomass; artificial neural network Arctic; synthetic aperture radar; phytomass; artificial neural network
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Collingwood, A.; Treitz, P.; Charbonneau, F.; Atkinson, D.M. Artificial Neural Network Modeling of High Arctic Phytomass Using Synthetic Aperture Radar and Multispectral Data. Remote Sens. 2014, 6, 2134-2153.

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