U.S. Geological Survey
2011
Land area change in coastal Louisiana from 1932 to 2010
first
remote-sensing image
U.S. Geological Survey
Scientific Investigations Map 3164
Lafayette, LA
U.S. Geological Survey
Couvillion, B.R.; Barras, J.A.; Steyer, G.D.; Sleavin, William; Fischer, Michelle; Beck, Holly; Trahan, Nadine; Griffin, Brad; and Heckman, David, 2011, Land area change in coastal Louisiana from 1932 to 2010: U.S. Geological Survey Scientific Investigations Map 3164, scale 1:265,000, 12 p. pamphlet.
The purpose of this study is to provide updated estimates of persistent land change and historical land change trends for coastal Louisiana and for each hydrologic basin, as defined by the Coastal Wetlands Planning, Protection and Restoration Act Program (n.d.), for the 1932-2010 period of record. The use of 17 datasets plus the application of consistent change criteria in this study provide opportunities to better understand the timing and causal mechanisms of wetland loss, which are critical for forecasting landscape changes in the future.
EnglishThe analyses of landscape change presented in this dataset use historical surveys, aerial data, and satellite data to track landscape changes in coastal Louisiana. Persistent loss and gain data are presented for 1932-2010. The U.S. Geological Survey (USGS) analyzed landscape changes in coastal Louisiana by determining land and water classifications for 17 datasets. These datasets include survey data from 1932, aerial data from 1956, and Landsat Multispectral Scanner System (MSS) and Thematic Mapper (TM) data from the 1970s to 2010.Variable data coverage among the 1932 and 1956 datasets and all subsequent data required an assumption of no change in the area of no data coverage (areas with no overlap) in those datasets. No change is assumed in land area from 1932 to 1956 and from 1956 to 1973 in portions of the dataset that occur outside the boundaries of the 1932 and 1956 data coverage. (Refer to SIM 3164 for more information regarding the areas within the coastal basins to which this assumption was applied.)
19322010
ground condition
Irregular
wetland change
wetland losslandscape changechange analysisshoreline erosionhurricane effects
Louisiana
coastal Louisiana
1932-2010
None
The U.S. Geological Survey requests to be acknowledged as originators of these data in future products or derivative research.
Brady Couvillion
U.S. Geological Survey, National Wetlands Research Center, Coastal Restoration Field Station
Geographer
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
225-578-7484
225-578-7927
bcouvillion@usgs.gov
M-F, 8:30-4:30 EST
Brady Couvillion
Geographer
USGS National Wetlands Research Center
Coastal Restoration Field Station
c/o Livestock Show Office
Parker Coliseum, LSU
Baton Rouge, LA 70803
Acknowledgment of the U.S. Geological Survey, National Wetlands Research Center, as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected. Sharing of new data layers developed directly from these data would also be appreciated by the U.S. Geological Survey staff. Users should be aware that comparisons with other datasets for the same area from other time periods may be inaccurate because of inconsistencies resulting from changes in photointerpretation, mapping conventions, and digital processes over time. These data are not legal documents and are not to be used as such.
Unclassified
Unclassified
None
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350
2011IMG
Brady CouvillionUSGS National Wetlands Research Center
mailing and physical address
c/o Livestock Show Office
Baton Rouge
LA
70803
USA
Parker Coliseum, LSU
M-F, 8:00-4:30 CST
Geographer225-578-7484225-578-7927bcouvillion@usgs.gov
Preprocessing of all datasets included use of ERDAS IMAGINE AutoSync (ERDAS Inc., Norcross, Ga.), a software that uses an automated process to align common landform features between images. To assess change, the geometric registration between datasets must be highly accurate. Misalignment of features at the same location could produce invalid land change results. This processing step was critical in ensuring that the 1932 and 1956 data aligned with the later satellite-based data.ERDAS IMAGINE 9.3
Brady Couvillion
USGS National Wetlands Research Center
Geographer
mailing and physical address
c/o Livestock Show Office
Baton Rouge
LA
70803
USA
Parker Coliseum, LSU
225-578-7484
M-F, 8:30-4:30 CST
bcouvillion@usgs.gov
The Landsat MSS data (1973, 1977, and 1979), which have a native 60-meter (m) resolution, were first resampled to a 30-m resolution by using a cubic convolution resampling method to facilitate comparability with later Landsat TM-based data (native 30-m resolution). Conducting this resampling prior to land-water classification is more appropriate than resampling the results of the land-water classification.ERDAS IMAGINE 9.3
c/o Livestock Show Office mailing addressParker Coliseum, LSU Baton RougeLA70803USABrady CouvillionUSGS National Wetlands Research CenterGeographer225-578-7484225-578-7927bcouvillion@usgs.govAll satellite imagery data were then classified into land/water categories by using a standard methodology similar to that used in previous studies (Barras, 2006, 2007; Barras and others, 2008). The methodology used in this study relied heavily on the use of the near infrared band of Landsat data (MSS: Band 4; TM: Band 5) in the early stages of classification. Near infrared (NIR) was selected because the wavelengths in this range, 1.55-1.75 micrometers, are particularly informative and discriminatory with regard to land and water categories. Supervised and unsupervised classification was then used to account for areas that may be incorrectly classified by the NIR band alone. Areas that need further attention for accurate classification commonly include highly turbid water areas and floating aquatic vegetation. These areas were manually recoded to their appropriate land/water categories by expert analyses.c/o Livestock Show Office mailing addressParker Coliseum, LSU Baton RougeLA70803USABrady CouvillionUSGS National Wetlands Research CenterGeographer225-578-7484225-578-7927bcouvillion@usgs.govTo reduce some of the errors associated with apparent land change caused by misclassification or transient environmental phenomena, two approaches were utilized. Changes must persist for at least two time periods (of variable length, depending upon availability of cloud-free imagery) following the initial change, and anomalous changes among land and water categories can only occur in less than 20 percent of the remaining datasets. The mapped dataset identifies only these areas of persistent and consistent change. For this reason, recent land changes (2008-2009 and 2009-2010) cannot yet be defined as persistent because data are not available to confirm that these changes have persisted into the two following analysis periods. These unconfirmed changes are instead referred to as "new land investigation areas" and "new water investigation areas".Metadata imported.I:\raster\SIMs\SIM_1932_2010_Land_Change\Metadata\mod_myd_13q1_metadata_draft.xml2011051811245200
WRS-2
Raster
Pixel
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Universal Transverse Mercator
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0.999600-93.0000000500000.0000000
row and column
30.000000
30.000000
meters
D_WGS_1984
WGS_1984
6378137
298.257224
UTM Zone 15
U.S. Geological Survey
Brady Couvillion
Geographer
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
225-578-7484
M-F, 8:00-4:30 CST
225-578-7927bcouvillion@usgs.govc/o Livestock Show Office
Parker Coliseum, LSU
Baton Rouge, LA 70803
SIM 3164
These data were prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
ERDAS
GeoTIFF
DVD
DVD
Vary
Contact U.S. Geological Survey.
Vary
Contact U.S. Geological Survey for details.
20022009
Brady Couvillion
USGS National Wetlands Research Center, Coastal Research Field Station
Geographer
mailing and physical address
c/o Livestock Show Office, parker Coliseum, LSU
Baton Rouge
LA
70803
USA
225-578-7484
M-F, 8:30-4:30 EST
bcouvillion@usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
20110518
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