MARS2014 Lecture 17: MARS2014- Week 6 Lecture 2
Tuesday, 27 March 2018
MARS2014- Week 6 Lecture 2
Remote Imagery Sensing Pt.3 Mangroves, Seagrass, & Coral Reefs
-Mangroves:
•Topographical settings help with looking at land sea interface
•Very hard to map due to the conditions
•RS data gives textural characteristics (spatial homogeneity/heterogeneity)
-Seagrasses:
-Turbid and clear waters require varying mapping approaches (if you can see it, the
satellite wont see it)
-Manual delineation needed with turbid to clear turbid water
-3 levels of water: turbid (cant see bottom even in knee deep water), turbid to clear,
clear (can see practically all the way to the bottom even in deep water)
-High Spatial Resolution Imagery to map seagrass species and biomass
-Biomass cores cover species, cover, and weight
-Coral reefs:
-Vary is specific spatial and information scales
-Satellite images pick up different reef types (fringing, lagoon, barrier)
-Each reef can be divided into zonations
-Patch scale shows the algae, coral, benthic micro algae, sand, rubble, and rock
composition
-231,000 reefs in the world
-Large reefs need many images, however this takes time and some might be taken
at low tide whilst others at high tide
-Accuracy maps to show the quality of other maps
-Hard coral needs hard substrate
-Rules to map reef crest: consolidated (darker objects), shallowest (depth),
horizontal plane (slope angle), inward (wave height), next to slope (neighbourhood)
- Need to assess for mapping: user needs, spatial and temporal scales, remote sensing
& field resources, spatial scales & sensor, trade offs (e.g. accuracy), cost
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find more resources at oneclass.com
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Document Summary
Remote imagery sensing pt. 3 mangroves, seagrass, & coral reefs. Mangroves: topographical settings help with looking at land sea interface, very hard to map due to the conditions, rs data gives textural characteristics (spatial homogeneity/heterogeneity) Turbid and clear waters require varying mapping approaches (if you can see it, the satellite wont see it) Manual delineation needed with turbid to clear turbid water. 3 levels of water: turbid (cant see bottom even in knee deep water), turbid to clear, clear (can see practically all the way to the bottom even in deep water) High spatial resolution imagery to map seagrass species and biomass. Biomass cores cover species, cover, and weight. Vary is speci c spatial and information scales. Satellite images pick up different reef types (fringing, lagoon, barrier) Each reef can be divided into zonations. Patch scale shows the algae, coral, benthic micro algae, sand, rubble, and rock composition.
