Sub Layers:
Name: Linear Regression Rates (LRR) 1880-2006
Display Field:
Type: Group Layer
Geometry Type: null
Description: Long-term rates of shoreline change were determined by fitting a least squares regression line to all shoreline positions from the earliest (1880s) to the most recent (2006). The rate of change is the slope of the regression line. Negative values indicate erosion (movement of the shoreline away from the established baseline) and positive values indicate accretion (movement of the the shoreline towards the established baseline.) The calculation of linear regression rates requires a minimum of three shoreline years at each transect, and rates calculated with many shoreline positions can increase confidence by reducing potential errors associated with the source data, and fluctuating short-term changes (Dolan et al.and others, 1991).
The linear regression method for determining shoreline change rates assumes a linear trend of change among the shoreline dates. However, in locations where shoreline change rates have not remained constant through time, a linear trend would not exist. For example, a shoreline may exhibit accretion over the first 100 years, but in later years, the shoreline may shift to an erosional trend. In these cases, it is expected that using a linear fit to the data is poorer, and as a result the uncertainty asociated with these shoreline change rates is higher than those whose trend is more linear.
Copyright Text:
Default Visibility: true
MaxRecordCount: 0
Supported Query Formats: JSON, geoJSON
Min Scale: 1500100
Max Scale: 0
Supports Advanced Queries: false
Supports Statistics: false
Has Labels: false
Can Modify Layer: false
Can Scale Symbols: false
Use Standardized Queries: true
Extent:
XMin: -8200303.642523454
YMin: 5010338.176234476
XMax: -7996040.95122335
YMax: 5069696.421575724
Spatial Reference: 102100
(3857)
Drawing Info:
Advanced Query Capabilities:
Supports Statistics: false
Supports OrderBy: false
Supports Distinct: false
Supports Pagination: false
Supports TrueCurve: false
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: false
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false
HasZ: false
HasM: false
Has Attachments: false
HTML Popup Type: esriServerHTMLPopupTypeNone
Type ID Field: null
Fields:
None
Supported Operations:
Query
Query Attachments
Generate Renderer
Return Updates
Iteminfo
Thumbnail
Metadata