Data

High tide and low tide composites 25m v. 2.0.0

Geoscience Australia
Commonwealth of Australia (Geoscience Australia)
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://pid.geoscience.gov.au/dataset/ga/113843&rft.title=High tide and low tide composites 25m v. 2.0.0&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/113843&rft.description=The High and Low Tide Composites product is composed of two surface reflectance composite mosaics of Landsat TM and ETM+ (Landsat 5 and Landsat 7 respectively) and OLI (Landsat 8) surface reflectance data (Li et al., 2012). These products have been produced using Digital Earth Australia (DEA). The two mosaics allow cloud free and noise reduced visualisation of the shallow water and inter-tidal coastal regions of Australia, as observed at high and low tide respectively (Sagar et al., 2018). The composites are generated utilising the geomedian approach of Roberts et al (2017) to ensure a valid surface reflectance spectra suitable for uses such as habitat mapping. The time range used for composite generation in each polygon of the mosaic is tailored to ensure dynamic coastal features are captured whilst still allowing a clean and cloud free composite to be generated. The concepts of the Observed Tidal Range (OTR), and Highest and Lowest Observed Tide (HOT, LOT) are discussed and described fully in Sagar et al. (2017) and the product description for the ITEM v 1.0 product (Geoscience Australia, 2016).Maintenance and Update Frequency: asNeededStatement: The product has been developed to provide a geomedian composite visualisation of coastal regions of Australia for the highest and lowest 20% of the observed tidal rangein the Landsat catalogue. Coastal Landsat observations are composited relative to tidal modelling of the Australian coastline (split into 306 polygons, characterised by similar tidal characteristics) using Oregon State Tidal Prediction Software (OTPS, Egbert and Erofeeva, 2002, 2010)). Egbert, G.D., Erofeeva, S.Y., 2010. The OSU TOPEX/Poseiden Global Inverse Solution TPXO [WWW Document]. TPXO8-Atlas Version 10. URL http://volkov.oce.orst.edu/tides/global.html (accessed 2.15.16). Egbert, G.D., Erofeeva, S.Y., 2002. Efficient Inverse Modeling of Barotropic Ocean Tides. J. Atmospheric Ocean. Technol. 19, 183–204. doi:10.1175/1520-0426(2002)0192.0.CO;2 basic_html&rft.creator=Commonwealth of Australia (Geoscience Australia) &rft.date=2017&rft.coverage=westlimit=-1943830; southlimit=-1119030; eastlimit=2170690; northlimit=-4856630&rft.coverage=westlimit=-1943830; southlimit=-1119030; eastlimit=2170690; northlimit=-4856630&rft_rights=&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=http://creativecommons.org/licenses/&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Australian Government Security ClassificationSystem&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=geoscientificInformation&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
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CC-BY

Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

Creative Commons Attribution 4.0 International Licence

CC-BY

4.0

http://creativecommons.org/licenses/

WWW:LINK-1.0-http--link

Australian Government Security ClassificationSystem

https://www.protectivesecurity.gov.au/Pages/default.aspx

WWW:LINK-1.0-http--link

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Brief description

The High and Low Tide Composites product is composed of two surface reflectance composite mosaics of Landsat TM and ETM+ (Landsat 5 and Landsat 7 respectively) and OLI (Landsat 8) surface reflectance data (Li et al., 2012). These products have been produced using Digital Earth Australia (DEA). The two mosaics allow cloud free and noise reduced visualisation of the shallow water and inter-tidal coastal regions of Australia, as observed at high and low tide respectively (Sagar et al., 2018). The composites are generated utilising the geomedian approach of Roberts et al (2017) to ensure a valid surface reflectance spectra suitable for uses such as habitat mapping. The time range used for composite generation in each polygon of the mosaic is tailored to ensure dynamic coastal features are captured whilst still allowing a clean and cloud free composite to be generated. The concepts of the Observed Tidal Range (OTR), and Highest and Lowest Observed Tide (HOT, LOT) are discussed and described fully in Sagar et al. (2017) and the product description for the ITEM v 1.0 product (Geoscience Australia, 2016).

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Maintenance and Update Frequency: asNeeded
Statement: The product has been developed to provide a geomedian composite visualisation of coastal regions of Australia for the highest and lowest 20% of the observed tidal rangein the Landsat catalogue. Coastal Landsat observations are composited relative to tidal modelling of the Australian coastline (split into 306 polygons, characterised by similar tidal characteristics) using Oregon State Tidal Prediction Software (OTPS, Egbert and Erofeeva, 2002, 2010)). Egbert, G.D., Erofeeva, S.Y., 2010. The OSU TOPEX/Poseiden Global Inverse Solution TPXO [WWW Document]. TPXO8-Atlas Version 10. URL http://volkov.oce.orst.edu/tides/global.html (accessed 2.15.16). Egbert, G.D., Erofeeva, S.Y., 2002. Efficient Inverse Modeling of Barotropic Ocean Tides. J. Atmospheric Ocean. Technol. 19, 183–204. doi:10.1175/1520-0426(2002)019<0183:EIMOBO>2.0.CO;2 basic_html

Created: 09 05 2017

Issued: 01 11 2017

Modified: 01 11 2017

Modified: 19 01 2018

Modified: 20 02 2018

Modified: 23 04 2018

Modified: 26 04 2018

Modified: 28 06 2018

Modified: 28 06 2018

Modified: 03 05 2019

Modified: 03 05 2019

Modified: 20 05 2019

Modified: 20 05 2019

Modified: 23 05 2019

Modified: 23 05 2019

Data time period: 16 08 1986 to 31 07 2017

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Spatial Coverage And Location

text: westlimit=-1943830; southlimit=-1119030; eastlimit=2170690; northlimit=-4856630

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Published_External | geoscientificInformation |

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Product description

uri : https://d28rz98at9flks.cloudfront.net/113843/HLTC_Product_Description.pdf

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