Thoughts - Gaps in PGS Coverage Covered by EVS
Pepel Island - PGS Shorelines 1:30,000)
The shorelines in the above image are PGS precision shorelines. They are typically excellent in tracing Landsat imagery shorelines. That is until you have shorelines that contain wetlands. According to individuals at MDA that worked on the project, wetlands were to be excluded as shoreline. I can appreciate the logic behind the decision to exclude these water-logged areas. However, there is a problem.
Pepel Island - Landsat Image N-28-05_2000 (1-30,000)
This is the Landsat imagery that Prototype Global Shoreline (PGS) was derived from. You can see that PGS tracks only the non-wetland shoreline. Enhanced Vector Shoreline (EVS), my product, not only tracks the island shorelines, but includes the wetlands.
Pepel Island - Marplot Map (1-30,000)
This is my solution for mapping Pepel Island. The entire island is mapped to include both land and wetlands. The two warfs at the sourthern end of the island was derived from Google Earth Imagery. If I'm a dude in a boat heading into Pepel Island port, I definitely would want to see the wetlands.
Pepel Island - Landsat Image and EVS Mapping
This side-by-side shows the Landsat image used to create both PGS (red lines) and EVS (the completed map). EVS most nearly depicts the base imagery.
Enjoy!
