trawling_gom_landsat_index.jpg

Index map showing locations of Landsat satellite images used for this study. Backdrop is shaded-relief topography and bathymetry.

Trawling - Gulf of Mexico - Landsat Index

Please contact SkyTruth (info@skytruth.org) for more information and permission to use.

John Amos

SkyTruth

trawling_gom_areas1234_index.jpg

Index map showing locations of Landsat satellite images used for this study, and target areas 1,2,3 and 4. Backdrop is shaded-relief topography and bathymetry.

Trawling - Gulf of Mexico - Landsat Index, Areas 1-4

Please contact SkyTruth (info@skytruth.org) for more information and permission to use.

John Amos

SkyTruth

trawling_gom_areas56_index.jpg

Index map showing locations of Landsat satellite images used for this study, and target areas 5 and 6. Backdrop is shaded-relief topography and bathymetry.

Trawling - Gulf of Mexico - Landsat Index, Areas 5 and 6

Please contact SkyTruth (info@skytruth.org) for more information and permission to use.

John Amos

SkyTruth

trawling_gom_GE_1.JPG

Google Earth image showing numerous trawlers generating sediment trails along the Louisiana coast. Oblique panoramic view to the northwest.

Sediment Trails off Louisiana - Google Earth Oblique View

Please contact SkyTruth (info@skytruth.org) for more information and permission to use.

John Amos

SkyTruth

trawling_gom_GE_2.JPG

Google Earth image showing trawlers generating sediment trails along the Louisiana coast. Vertical view.

Sediment Trails off Louisiana - Google Earth Vertical View

Please contact SkyTruth (info@skytruth.org) for more information and permission to use.

John Amos

SkyTruth

organization

trawling_gom_GE_3.JPG

Closeup of Google Earth image showing a shrimp trawler generating a sediment trail along the Louisiana coast. Individual "strands" of sediment appear about 50 meters off the stern, and within 150 meters coalesce into a single broad plume of sediment. Vessel is about 24 meters long. Vertical view.

Trawler and Sediment Trail off Louisiana - Google Earth Closeup

trawling_gom_area1_24oct99_detail.jpg

trawling_gom_area1_24oct99.jpg

Landsat satellite image, Gulf of Mexico, Area 1, taken on 10/24/99. Note abundant sediment trails, likely caused by intense trawling in this area. Water depth <20m. Large, indistinct bright blue patches are cloud/haze. Landsat spectral bands 1,2,3 presented as a natural-color composite.

Area 1 - October 24, 1999

Please contact SkyTruth (info@skytruth.org) for more information and permission to use.

trawling_gom_area2_12oct92.jpg

Landsat satellite image, Gulf of Mexico, Area 2 (mouth of Vermillion Bay, Louisiana, immediately east of Area 1), taken on 10/12/92. Note abundant narrow sediment trails, most in shallow water (<20m), possibly caused by trawling. Landsat spectral bands 1,2,3 presented as a natural-color composite.

Area 2 - October 12, 1992

trawling_gom_area3_24oct99.jpg

Landsat satellite image, Gulf of Mexico, Area 3, taken on 10/24/99. Note abundant sediment trails, likely caused by intense trawling in this area. Water depth approaches 70m at bottom left (140km offshore). Landsat spectral bands 1,2,3 presented as a natural-color composite.

Area 3 - October 24, 1999

Please contact SkyTruth (info@skytruth.org) for more information and permission to use.

trawling_gom_area2_12oct92_detail.jpg

Detail from Landsat satellite image, Gulf of Mexico, Area 2, taken on 10/12/92. Note abundant narrow sediment trails, most in shallow water (<20m), possibly caused by trawling, in an area of generally high suspended sediment concentration. Landsat spectral bands 1,2,3 presented as a natural-color composite.

Area 2, Detail - October 12, 1992

trawling_gom_area3_24oct99_detail.jpg

Detail from Landsat satellite image, Gulf of Mexico, Area 3, taken on 10/24/99. Water depth is about 68m in this area (140km offshore). Landsat spectral bands 1,2,3 presented as a natural-color composite.

Area 3, Detail - October 24, 1999

Please contact SkyTruth (info@skytruth.org) for more information and permission to use.

John Amos

trawling_gom_area4_6dec86.jpg

Landsat satellite image, Gulf of Mexico, Area 4 (off Cameron, Louisiana), taken on 12/06/86. Numerous sediment trails are apparent. Bright blue streaks in lower left and right are clouds/haze. Landsat spectral bands 1,2,3 presented as a natural-color composite.

Area 4 - December 6, 1986

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trawling_gom_area5_1oct92.jpg

Landsat satellite image, Gulf of Mexico, Area 5 (Matagorda Bay, Texas), taken on 10/01/92. Numerous sediment trails are apparent in the coastal lagoon (sediment patterns offshore suggest high wind conditions). Note power-plant smoke or steam plume at top center. Landsat spectral bands 1,2,3 presented as a natural-color composite.

Area 5 - October 1, 1992

trawling_gom_area4_6dec86_detail.jpg

Detail from Landsat satellite image, Gulf of Mexico, Area 4, taken on 12/06/86. Numerous sediment trails are apparent. Note brown sediment-laden plume emanating from coastal lagoon outlet channel (right). Landsat spectral bands 1,2,3 presented as a natural-color composite.

Area 4, Detail - December 6, 1986

Please contact SkyTruth (info@skytruth.org) for more information and permission to use.

trawling_gom_area5_1oct92_detail.jpg

Detail from Landsat satellite image, Gulf of Mexico, Area 5, taken on 10/01/92. Numerous sediment trails are apparent in the coastal lagoon (sediment patterns offshore suggest high wind conditions). Note power-plant smoke or steam plume at top center. Landsat spectral bands 1,2,3 presented as a natural-color composite.

Area 5, Detail - October 1, 1992

trawling_gom_area6_1oct92_detail.jpg

Detail from Landsat satellite image, Gulf of Mexico, Area 6, taken on 10/01/92. Sediment trails are apparent throughout the lagoon. Landsat spectral bands 1,2,3 presented as a natural-color composite.

Area 6, Detail - October 1, 1992

Please contact SkyTruth (info@skytruth.org) for more information and permission to use.

John Amos

trawling_gom_area6_1oct92.jpg

Landsat satellite image, Gulf of Mexico, Area 6 (Corpus Christi, Texas), taken on 10/01/92. Sediment trails are apparent throughout the lagoon. Landsat spectral bands 1,2,3 presented as a natural-color composite.

Area 6 - October 1, 1992

Please contact SkyTruth (info@skytruth.org) for more information and permission to use.

John Amos