Historical and Projected Coastal Louisiana Land Changes

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The 1978 habitat data covered all of the LCA area with the exception of the upper portions of the Barataria and Terrebonne Basins and the western portion of the Pontchartrain Basin. Loss and gain trend rates for these missing areas were assessed by visually examining historical aerial color infared photography (1978) and USGS topographic maps (from 1960s and 1970s). The estimated loss rates observed were so low that we decided to use 1990 TM data to fill in the gaps of the 1978 data set (fig. 3). Spatial changes were assessed by comparing and combining the 1978, 1990, and 2000 CM data sets to form a composite 1978 to 1990 to 2000 spatial trend data set that identified areas of no change and areas that converted to either water or land during the 22 year interval. The data set was then filtered to remove small areas of new water and new land caused by a spatial misregistration between the data sets (figs. 4 and 5). 7
8 Figure 3. Louisiana coastwide trend assessment area including the 1978 habitat data and 1990 Landsat Thematic Mapper data.
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: 6 Figure 2. Louisiana Coastal Area
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 and 34: net acreage for each project as det
Page 35 and 36: 30 Figure 18. Projected coastal Lou
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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