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Stacked Landsat scene Land pixels deleted with polygon mask Stacked Landsat scene minus land Landsat Band 1 Bands 1, 2, 3, 4, 5, and 7 are stacked Stacked.

Published byPaulina Wilkinson Modified over 8 years ago

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Presentation on theme: "Stacked Landsat scene Land pixels deleted with polygon mask Stacked Landsat scene minus land Landsat Band 1 Bands 1, 2, 3, 4, 5, and 7 are stacked Stacked."— Presentation transcript:

1 Stacked Landsat scene Land pixels deleted with polygon mask Stacked Landsat scene minus land Landsat Band 1 Bands 1, 2, 3, 4, 5, and 7 are stacked Stacked 7-band Landsat scene Landsat Band 2 Landsat Band 3 Landsat Band 4 Landsat Band 5 Landsat Band 7 Identification and deletion of cloud pixels via unsupervised classification Stacked Landsat scene minus land and minus clouds (cloudless water) Step 1: Stacking bands for a given Landsat scene (path, row, day) Step 2: Deleting land and clouds to reduce pixel confusion

2 Stacked 7-band cloudless water pixels Band ratio B3/B1 Output grid of B3/B1 Step 3: Running and comparing enhancement techniques Stacked 7-band cloudless water pixels Band ratio B2/B1 Output grid of B2/B1 Stacked 7-band cloudless water pixels Clay enhancement Output grid of clay enhancement Stacked 7-band cloudless water pixels Iron oxide enhancement Output grid of Iron oxide enhancement Visual comparison of enhancement techniques Good output. Save Output grid of B3/B1 Good output. Save Output grid of B2/B1 Good output. save clay enhancement grid

3 Step 4: Extraction of suspended sediment from enhancements Output grid of B3/B1 Output grid of B2/B1 Output grid of clay enhancement Extraction of suspended sediment pixels based on high pixel values Extraction of suspended sediment pixels based on high pixel values Extraction of suspended sediment pixels based on high pixel values Grid of pixels representing varying intensities of suspended sediment for B3/B1 Grid of pixels representing varying intensities of suspended sediment for B2/B1 Grid of pixels representing varying intensities of suspended sediment for clay enhancement Suspended sediment pixels mosaicked Grid of combined suspended sediment from enhancements

4 Step 5: Supervised classification (performed twice – once for the western side and once for the eastern side of the image due to pixel confusion from sunglint) Stacked 7-band cloudless water pixels Supervised classification of western side of image Supervised grid with classes representing suspended sediment, clear water, and cloud fringes Extraction of suspended sediment pixels in western side of image Grid of pixels representing varying intensities of suspended sediment in western part of image Stacked 7-band cloudless water pixels Supervised classification of eastern side of image Supervised grid with classes representing suspended sediment, clear water, and cloud fringes Extraction of suspended sediment pixels in eastern side of image Grid of pixels representing varying intensities of suspended sediment in eastern part of image

5 Step 6: Final products (metadata was also written to accompany the final image) Grid of pixels representing varying intensities of suspended sediment in western part of image Grid of pixels representing varying intensities of suspended sediment in eastern part of image Grid of combined suspended sediment from enhancements Suspended sediment pixels mosaicked Grid of combined suspended sediment pixels Clean-up of error pixels (mainly cloud pixels and image edges) Final image of the Landsat scene enhanced to show suspended sediment

6 GSA Product Methodology Flow Chart All bands combined to make a stacked image Clouds and land removed Traditional enhancements applied Supervised classification Results combined and edited Final image showing enhanced suspended sediment FGDC metadata produced for final image Final image, metadata, and original stacked image uploaded to ITSC ftp site Original Landsat bands downloaded from ITSC ftp site

7 GSA Product Methodology Flow Chart All bands combined to make a stacked image Clouds and land removed Traditional enhancements applied Supervised classification Results combined and edited Final image showing enhanced suspended sediment FGDC metadata produced for final image Final image, metadata, and original stacked image uploaded to ITSC ftp site Original Landsat bands downloaded from ITSC ftp site

8 GSA Product Methodology Flow Chart All bands combined to make a stacked image Clouds and land removed Traditional enhancements applied Supervised classification Results combined and edited Final image showing enhanced suspended sediment FGDC metadata produced for final image Final image, metadata, and original stacked image uploaded to ITSC ftp site Original Landsat bands downloaded from ITSC ftp site

9 GSA Product Methodology Flow Chart All bands combined to make a stacked image Clouds and land removed Traditional enhancements applied Supervised classification Results combined and edited Final image showing enhanced suspended sediment FGDC metadata produced for final image Final image, metadata, and original stacked image uploaded to ITSC ftp site Original Landsat bands downloaded from ITSC ftp site

10 GSA Product Methodology Flow Chart All bands combined to make a stacked image Clouds and land removed Traditional enhancements applied Supervised classification Results combined and edited Final image showing enhanced suspended sediment FGDC metadata produced for final image Final image, metadata, and original stacked image uploaded to ITSC ftp site Original Landsat bands downloaded from ITSC ftp site

11 GSA Product Methodology Flow Chart All bands combined to make a stacked image Clouds and land removed Traditional enhancements applied Supervised classification Results combined and edited Final image showing enhanced suspended sediment FGDC metadata produced for final image Final image, metadata, and original stacked image uploaded to ITSC ftp site Original Landsat bands downloaded from ITSC ftp site

12 GSA Product Methodology Flow Chart All bands combined to make a stacked image Clouds and land removed Traditional enhancements applied Supervised classification Results combined and edited Final image showing enhanced suspended sediment FGDC metadata produced for final image Final image, metadata, and original stacked image uploaded to ITSC ftp site Original Landsat bands downloaded from ITSC ftp site

13 Final Step: Visual inspection and documentation of features discovered in enhancement and processing of imagery Oil sheen off shore of Louisiana two days after Katrina. This oil was washed out from the oil spills onland. Patterns of the sheen help indicate flow and transport direction. Southeasterly pointing wisps of suspended sediment showing normal (pre-Arlene) sediment transport patterns. These wisps correlate with sand ridges on the seafloor.

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