Virtual Workshop 2021: Session 5 Talk2: Bathymetry and coral/seagrass mapping in Google Earth Engine
This session will showcase supervised classification of benthic habitats using the freely available Google Earth Engine: a powerful cloud computing tool to which holds a multi-petabyte catalogue of satellite imagery ready for rapid analysis. We will cover how to visualise, explore, process and download data within a simple supervised classification using Sentinel 2 imagery. Training and validation data will be created to carry out an accuracy assessment and quantify the performance of the classification.
Chapters
0:00 Talk Introduction
4:33 Explore Sentinel-2 data
8:11 Median Composite and masking
14:25 GEE script design
17:10 GEE Median Composite
22:03 GEE bathymetry
23:38 GEE classification
30:31 Accuracy statistics and finish
Access to Earth Engine code – https://code.earthengine.google.com/?accept_repo=users/stcarp/CME_MappingWorkshop
Download GEE Simple Classification User Guide (https://projects.noc.ac.uk/cme-programme/sites/cme-programme/files/documents/CME_workshop_SimpleSentinelClassification.zip)
atoll logiciel
Very good explanation for median composite..
Thank you sir
Hi. The GEE link gives an empty script. Is it possible that a new link would be provided?
When I visit the google earth engine link attached below the video, there is nothing in the code. Can you give me the link containing the code.
Array: Parameter 'values' is required.
this error has appeared when getting bathymetry
Hi Stephen, the GEE link you provided doesn't seem to work, it gives an empty script. Could you provide a new link? Thank you!
Sorry, your GEE script link doesn't work, please give another link, thank's
I got message "Image.load: Image asset 'users/stcarp/CME_MappingWorkshop/CME_workshop_Belize_landmask' not found."
How to change users from stcarp to my asset.
Can you share the format of the bathymetry points and how you uploaded the same?
Your GEE code link does not work. Would you please share the updated link with the full script?
If you need to estimate bathymetry using Stumpf or Lyzenga before 2017-03-28 (Level 2A availability). Change lines 35 or 36 to collect level 1C imagery (i.e. var s2Sr = ee.ImageCollection('COPERNICUS/S2');) for the Stumpf and Lyzenga scripts, respectively.