Historical and Projected Coastal Louisiana Land Changes

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Threshold Histogram Values Acreage Sum ... ... ... ... 3 1000 154.44 317.09 2 500 77.72 162.65 1 450 69.49 84.93 0 100 15.44 15.44 Acreage was calculated by multiplying the histogram value by 25 x 25 x 0.0002471054. The 25 m value represents the resolution of the TM imagery used (25 is the meter size of each raster pixel, multiplied together to get square meters, then multiplied by the factor 0.0002471054 to convert square meters into acres). Once threshold values have been determined each TM grid histogram is reclassified. In this example, threshold 0 and 1 would be predicted to be water in 2050 and threshold 2 and above would be predicted as land. Step 3. Mapping Future Loss-Gain All reclassified LCA and CWPPRA grids along with the actively managed areas were merged back together into the final 50-year projected grid. The final grid and the classified 2000 imagery were then used in a land-change analysis to determine the final land loss and gain (fig. 18). The assessment of the methodological error shows that the projected acreages of the modified Landsat imagery are within 3% of the calculated numbers of land change. 29
30 Figure 18. Projected coastal Louisiana land changes from 2000 to 2050.
Page 1 and 2: Historical and Projected Coastal Lo
Page 3 and 4: Historical and Projected Coastal Lo
Page 5 and 6: Figures and Tables Page Tables 1 Ne
Page 7 and 8: conditions in the fall of 1990 and
Page 9 and 10: Coastwide 1999-2000/02 Land and Wat
Page 11 and 12: 6 Figure 2. Louisiana Coastal Area
Page 13 and 14: 8 Figure 3. Louisiana coastwide tre
Page 15 and 16: 10 Figure 5. 1978 to 1990 and 1990
Page 17 and 18: Figure 6. 1990 to 2000 spatial tren
Page 19 and 20: Figure 8. 1990 to 2000 spatial tren
Page 21 and 22: Figure 10. 1990 to 2000 spatial tre
Page 27 and 28: calculations denoting land or water
Page 29 and 30: Caernarvon Using the same protocol
Page 31 and 32: Small portion of CWPPRA project are
Page 33: net acreage for each project as det
Page 37 and 38: However, the spatially explicit pro
Page 39 and 40: include periodically increased sedi
Page 41 and 42: available for the upper basins, dom
Page 43 and 44: FEIS, 1984, Final Environmental Imp

Historical and Projected Coastal Louisiana Land Changes

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