Land Cover Classification and Modeling of Ecosystem Carbon Flux in the Barrow Environmental Observatory Using IKONOS Satellite Imagery
Craig E. Tweedie, Fred Huemmrich, Robert D. Hollister, John A. Gamon, Glen Kinoshita, Patrick J. Webber, Brian Noyle, Diana Karwan, Steve Oberbauer, Andrea Kuchy, Walter C. Oechel, Stan Houston, Erika Anderson, Hyojung Kwon, Rommel C. Zulueta, Joe Verfaillie and Stuart Gage.Modeling of Carbon Flux (GEE)
- The acquisition of the high resolution IKONOS multispectral imagery for the BEO presents an unprecedented opportunity for scaling from plot-based functional studies to the landscape level using empirical models.
- A spatially explicit light-use efficiency model of Gross Ecosystem Carbon Exchange (GEE) has been developed. A flow chart illustrating model development, data integration and collaborative effort is given in Figure 4.
- The model incorporates atmospheric and instrument spectral corrections as well as transfer functions for red and near infra-red bands of IKONOS imagery developed from ground based hyperspectral reflectances measured along the CSULA tramline (Fig. 9). Hyperspectral reflectances taken on plots where diurnal flux measurements have been made by FIU/MSU and SDSU, have been used with the transfer functions to parameterise models of Fpar (the fraction of incident Photosynthetically Active Radiation (PAR) absorbed by plants) versus NDVI (Normalized Difference Vegetation Index), Apar (amount of PAR absorbed by the canopy), and GEE versus Apar. All of these models show strong statistical correlation and have been applied to the IKONOS imagery to predict GEE for the 16th of August when the best cloud free IKONOS imagery was acquired for region of the BEO and neighbouring lands where the majority of terrestrial functional studies near Barrow are located (Fig. 7).
- The model illustrates nicely, the different Carbon Flux attributes of the land cover types classified above. Model validation using eddy tower and or aircraft data, however, is required to substantiate this.
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| Fig. 5 - SDSU Moist site. | Fig. 6 - CSULA Tamline. |
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| Fig. 8 - Land Cover map of GEE model area | Fig. 7 - IKONOS pan-corrected MSS image of GEE model area. |
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| Fig. 12 - GEE gC m-2 for 16th August 2000 (total = 9.12 tC/day). | |
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| Fig. 9 - IKONOS Correction. | Fig. 10 - CSULA Fpar vs NDVI. |
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| Fig. 11 - CSULA GEE vs Apar | |
- Beginning
- Introduction
- IKONOS Satellite Imagery
- Land Cover Classification
- Modeling of Carbon Flux (GEE)
- Conclusions
- References