GEEDiT

The Google Earth Engine Digitisation Tool (GEEDiT) is designed to allow users to rapidly access time series of full resolution satellite imagery from anywhere on the planet, and to manually digitise, review and export margin information.

GEEDiT version 2
This provides an update (and hopefully improvement) to version 1, to now include:

  • Improved margin drawing tools, removing the lag time between users digitising points and them appearing on screen
  • Option to digitise polygons (note where polygons and lines are digitised together, these must be exported as a GeoJSON file, as mixing of geometry types is not allowed in shapefile exports)
  • Ability to edit margins that have already been digitised
  • Inclusion of ASTER satellite data as an option for visualisation (note true colour visualisations are note possible with this satellite)
  • Extra image quality flag options that are automatically appended to margins
  • Addition of hour, minute and second metadata to margins (UTC timezone)
  • Changes to code structure to prevent appearance of “Page unresponsive” warnings
  • Addition of option to skip to any available image that is temporally closest to a user defined date
  • Option to revisualise margins that have already been digitised
  • Option to compare a visualised image with those that immediately precede/follow it.

If you use this tool, please continue to cite the paper below.

Margin changes mapped from these tools can be quantified quickly and easily using the Margin Change Quantification Tool (MaQiT).

  • Extra information and access to the tools

IMPORTANT: If you use these tools to explore satellite imagery or digitise margins that are used as part of your work, you agree to cite: Lea, J. M. (2018). Google Earth Engine Digitisation Tool (GEEDiT), and Margin change Quantification Tool (MaQiT) – simple tools for the rapid mapping and quantification of changing Earth surface margins, Earth Surf. Dynam. in any publications.

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GEEDiT links:

Current versions:

      GEEDiT v2.03 – Tier 1 imagery – highest quality imagery

      GEEDiT v2.03 – Tier 2 imagery – imagery that does not meet Tier 1 criteria (see below)

      Update from v2.02: Landsat 9 data now included. Note Landsat 9 image collection is TOA rather than TOA_RT.

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Older GEEDiT versions:

      GEEDiT v2.02 – Tier 1 imagery – highest quality imagery

      GEEDiT v2.02 – Tier 2 imagery – imagery that does not meet Tier 1 criteria (see below)

      Fixes from v2.01: error in Landsat 5 image collection path rectified; fix to allow cloud cover and
export numbers defined by user to be properly passed to the UI; in Tier 2 version Landsat 7 and 8 image collections corrected from LX_RT_TOA to LX_TOA.

      GEEDiT v2.01 – Tier 1 imagery – highest quality imagery

      GEEDiT v2.01 – Tier 2 imagery – imagery that does not meet Tier 1 criteria (see below)

GEEDiT v1.012 – Tier 1 imagery – highest quality imagery

GEEDiT v1.012 – Tier 2 imagery – imagery that does not meet Tier 1 criteria – includes Antarctic imagery currently missing from Tier 1 image collections

For more information on the differences between Tier 1 and Tier 2 imagery see this link.

Current version allows GEEDiT to run following recent updates to the Google Chrome browser. If issues arise using other browsers please contact me

Legacy versions (may not work on current browsers):

GEEDiT v1.0 – version described in the publication

GEEDiT v1.01 – Tier 1 imagery – support for exporting data as shapefiles now included. Landsat Tier 1 imagery only (see: https://landsat.usgs.gov/what-are-landsat-collection-1-tiers for more information). Centreline shapefile compatibility issue with MaQiT fixed.

GEEDiT v1.01 – Tier 2 imagery (formerly GEEDiT v1.011) – Landsat collections changed from Tier 1 to Tier 2, so now includes acquisitions from Antarctica (thanks to Bertie Miles for flagging). Note that this will include imagery that does not meet Tier 1 processing criteria (see: https://landsat.usgs.gov/what-are-landsat-collection-1-tiers for more information). This may result in some imagery being of poor quality and/or having poor geolocation accuracy relative to Tier 1.

GEEDiT Reviewer links:

GEEDiT Reviewer v1.0 – version described in the publication

GEEDiT Reviewer v1.01 – default data export format changed to shapefile

GEEDiT Regional links

GEEDiT Regional v1.0

As with any code, while I have done my best to identify and fix bugs in the code I cannot 100% guarantee that some don’t exist. Functionality exists within GEEDiT to guard against loss of analysis during use that may arise from the user’s internet connection dropping or other unexpected problems. The user has full responsibility for the quality and integrity of data generated using these tools.

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