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U.S. Geological Survey U.S. Department of Interior GFSAD30m Global Cropland Extent Products of Nominal 250 m (GCE V2.0) Area claculations Pardhasaradhi.

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Presentation on theme: "U.S. Geological Survey U.S. Department of Interior GFSAD30m Global Cropland Extent Products of Nominal 250 m (GCE V2.0) Area claculations Pardhasaradhi."— Presentation transcript:

1 U.S. Geological Survey U.S. Department of Interior GFSAD30m Global Cropland Extent Products of Australia @ Nominal 250 m (GCE V2.0) Area claculations Pardhasaradhi Teluguntla, Prasad Thenkabail and Jun Xiong 21 st May, 2015

2 GFSAD 250m Cropland Products of Australia Automated Cropland Classification Algorithm (ACCA) U.S. Geological Survey U.S. Department of Interior  Based on Ideal spectral signatures, developed Automated Cropland Classification Algorithm (ACCA) for each of 3 cropland masks of Australia.  Validated ACCA-2014 results with SMT-2014 results  Applied ACCA year to year (2000-2014) to study cropland change dynamics over 15 years Recall…

3 U.S. Geological Survey U.S. Department of Interior GFSAD 250m Cropland Products of Australia : Updates Cropland change dynamics (2000-2014)  Sub pixel area calculations  Accuracy assessment with other available sources

4 U.S. Geological Survey U.S. Department of Interior Australia GCE V2.0 Projection: GDA_1994_Australia_AlbersProjection: Geographic

5 U.S. Geological Survey U.S. Department of Interior Australia GCE V2.0 vs DLCD Full Pixel Area Projection: GDA_1994_Australia_Albers

6 U.S. Geological Survey U.S. Department of Interior Australia GCE V2.0 vs DLCD Projection: GDA_1994_Australia_Albers DLCD = Dynamic Land Cover Dataset produced by Geoscience Australia, Lymburner et al, 2014. GCEV2-Australia DLCD-Australia

7 U.S. Geological Survey U.S. Department of Interior Australia GCE V2.0 vs DLCD Full Pixel Area Projection: GDA_1994_Australia_Albers

8 U.S. Geological Survey U.S. Department of Interior Area Calculations  Full pixel area calculation (FPA)  Crop area fraction calculation (CAF)  Sub pixel area calculation (SPA)  Actual area calculation  Accuracy assessment with other available sources 1.GCE V2.0 FPA vs. DLCD 2.GCE V2.0 SPA vs. FAO

9 U.S. Geological Survey U.S. Department of Interior Full Pixel Area Calculation 1.Lat = Latitude of center of each pixel 2.Cos (Lat in radians) 3.Area of each Pixel (in sq.meters) = cos (Lat in radian)*(233.7 m*233.7 m) [ Pixel size in dd = 0.0021 Pixel size in meters = (40075*1000/360)*0.0021 = 233.77 ]

10 U.S. Geological Survey U.S. Department of Interior Full Pixel Area Calculation

11 U.S. Geological Survey U.S. Department of Interior Full Pixel Area of Australia Croplands

12 U.S. Geological Survey U.S. Department of Interior Full Pixel Area of Australia Croplands

13 U.S. Geological Survey U.S. Department of Interior Crop Area Fraction Calculation

14 U.S. Geological Survey U.S. Department of Interior Crop Area Fraction Calculation

15 U.S. Geological Survey U.S. Department of Interior Crop Area Fraction Calculation

16 U.S. Geological Survey U.S. Department of Interior Crop Area Fraction Calculation for Australia Croplands

17 U.S. Geological Survey U.S. Department of Interior Sub Pixel Area Calculation (SPA) SPA= FPA * CAF

18 U.S. Geological Survey U.S. Department of Interior Sub Pixel Area of Australia Croplands (SPA)

19 U.S. Geological Survey U.S. Department of Interior Actual Area of Australia Croplands Aggregated 3 classes

20 U.S. Geological Survey U.S. Department of Interior


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