20240522 16293400 1.0 TRUE 150000000 5000 ItemDescription Biospatial_MangroveExtents_Nrth20240219z Mangroves Northland Wetlands Coastal Extents Machine Learning This machine learning dataset predicts the extent of mangroves along the Northland coastline. Coastline used to delineate the extent of this data is the Biospatial_SalineInfluenceExtent_Northland. <DIV STYLE="text-align:Left;"><DIV><DIV><UL><LI><P><SPAN>Mangroves were mapped using a combination of LiDAR (2018) and RGBI (2014-2016) imagery captured by Northland and Auckland Councils. </SPAN></P></LI><LI><P><SPAN>Data was derived using a combination of machine learning model training and manual output validation. </SPAN></P></LI><LI><P><SPAN>Validated was conducted using a combination of Photoblique and GIS desktop surveys. </SPAN></P></LI><LI><P><SPAN>Slope, Spectral signatures, Topographic wetness index and vegetation structure were inputs into the machine learning model. </SPAN></P></LI><LI><P><SPAN>Mangrove height of 0.5m and vegetation cover of 50% were used as guides for mapping. </SPAN></P></LI><LI><P><SPAN>Data is presented using a polygon approach for ease of display. </SPAN></P></LI><LI><P><SPAN>Elevation data has been attached for overlay in Photoblique.   </SPAN></P></LI></UL><P><SPAN>Data Limitations: </SPAN></P><UL><LI><P><SPAN>Data may be subject to false positive and/or false negative results. </SPAN></P></LI><LI><P><SPAN>The spatial extents can be used as a guide for where saltmarsh exists </SPAN></P></LI><LI><P><SPAN>Scale is created to a 1m resolution </SPAN></P></LI><LI><P><SPAN>Data is representation of the capture date of the imagery and LiDAR. </SPAN></P></LI></UL></DIV></DIV></DIV> Biospatial Limited Photoblique Limited  Auckland Council Northland Regional Council <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Northland Regional Council and Biospatial Limited maintain ownership of the dataset. </SPAN></P></DIV></DIV></DIV> 20240530