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Service Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This polygon dataset contains a time series for the spatial extent of eelgrass (Zostera marina) meadows delineated from aerial imagery at several long-term monitoring sites located along the coast of British Columbia.</SPAN></P><P><SPAN>The areal extent of eelgrass (Zostera marina) meadows is an important metric for understanding the broader dynamics of eelgrass habitats. Since 2015, the Hakai Geospatial Program has been using remotely piloted aerial systems (RPAS, aka drone) imagery to record change in eelgrass meadow extent at monitoring sites in BC. Prior to 2015, eelgrass extent at monitoring sites has been conducted using aerial fixed wing aircraft and helicopter imagery and towed underwater video (see 2014 metadata record for eelgrass sites delineated using towed underwater video). Existing methods for mapping eelgrass (e.g. low-tide walking surveys, towed video, or boat-based SCUBA surveys) can be difficult to apply repeatedly and efficiently across large geographic extents. RPASs are portable and efficient tools for mapping nearshore marine environments, such as eelgrass habitat. Despite some limitations of RPAS mapping (e.g. weather, flight time, survey size), RPASs are able to collect high-resolution data (<10 cm) during short windows of opportunity (e.g. low tide).</SPAN></P><P><SPAN>Core monitoring sites at the Hakai Institute include three eelgrass beds (Pruth Bay, Choked Pass and Koeye) that are mapped annually and three others (Triquet Bay, Goose SW, and McMullin North) which are mapped bi-annually (Fig. 1). Other sites have been mapped advantageously or as part of shorter-term projects and are included in this data package.</SPAN></P><P><SPAN>For each site, eelgrass extent was delineated using a combination of object-based image analysis (eCognition Developer 9) and manual delineation within a GIS environment (ArcGIS, v 10.8). In brief, image objects area created via a multiresolution segmentation algorithm within eCognition and the site orthomosaic. These objects are exported to a GIS environment where an analyst classifies objects as eelgrass. The minimum mapping unit for a patch of eelgrass or patch within a bed is 4 m2.</SPAN></P></DIV></DIV></DIV>
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Service Item Id: 6a8e1a1b67fd45c4aa3c09f105d4670c
Copyright Text: Hakai Institute
Spatial Reference:
3153
(3153)
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Single Fused Map Cache: false
Initial Extent:
XMin: 464531.7437429188
YMin: 573492.3788218175
XMax: 1291243.103657081
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Spatial Reference: 3153
(3153)
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XMin: NaN
YMin: NaN
XMax: NaN
YMax: NaN
Spatial Reference: 3153
(3153)
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Units: esriMeters
Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP
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Title: C:\Users\will.mcinnes\Documents\ArcGIS\Projects\MyProject9\MyProject9.aprx
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Keywords: oceans,seagrass,zostera-marina,eelgrass,nearshore,habitat-mapping,central-coast,drone
AntialiasingMode: Fast
TextAntialiasingMode: Force
Supports Dynamic Layers: true
MaxRecordCount: 2000
MaxImageHeight: 4096
MaxImageWidth: 4096
Supported Query Formats: JSON, geoJSON, PBF
Supports Query Data Elements: true
Min Scale: 0
Max Scale: 0
Supports Datum Transformation: true
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