lab2CoastalMappingTutorial110113

lab2CoastalMappingTutorial110113 - DERM Reef Mapping...

Info iconThis preview shows pages 1–16. Sign up to view the full content.

View Full Document Right Arrow Icon
DERM Reef Mapping Tutorial Prepared by Cindy Shaw Geosciences Department Florida Atlantic University
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The entire Palm Beach County coastline is contained in a series of one foot resolution tiff files obtained from the Department of Environmental Resources Management (DERM). The coastline is approximately 45 miles long. These images have been mosaiced, and then subset into about 90 smaller, manageable images using Erdas Imagine. Their accompanying tfw files have also been created, so that their spatial reference values have been retained.
Background image of page 2
Processing Image in Photo Shop Adobe Photo Shop is capable of recognizing pixels of similar spectral value within an image. Because of this, we are able to extract ‘reef’ pixels, which will later be converted into shapefiles, the final product. This is where a combination of careful evaluation and subjective artistry will help you to achieve an accurate and acceptable final product.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
NOTE! While dependency is placed upon the spectral acumen of digital programs utilized in mapping, some knowledge of marine geomorphology is necessary. Similar spectral characteristics do not insure that all pixels being selected fall into one category!
Background image of page 4
Schools of baitfish
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Patches of seaweed Nearshore Reef
Background image of page 6
Artificial reef
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Rubble Nearshore reef
Background image of page 8
Open the subset tiff image in Photo Shop. (File> Open, navigate to directory) Double-click padlock to open window, and click ‘OK’. This allows layer to be edited.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Go to Image>Adjustments>Brightness/Contrast Increase the contrast for maximum definition. This will enable both you and Photoshop to discern the reef pixels better. If the contrast is inadequate the first time, you can click ‘OK’, close the window and do it again. Also, adjust the brightness if desired. Click ‘OK’.
Background image of page 10
Click ‘Create New Layer’. You will see that a layer has been added.
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This new layer which has been generated is initially transparent. It is going to have only 2 classifications of pixels- reef and water. To begin, color the whole new layer blue, to represent water. Make sure Layer 1 is highlighted. (Whichever layer is highlighted is the one that will be affected by any processing in Photoshop.) Click Foreground Color square on Toolbar. Color Picker window will open. Click on deep blue in color bar>top right of square>’OK’. Then open Paint Bucket tool, and click on Layer. Foreground Color
Background image of page 12