Parent Layer:
SAR Seasonal Flood Maps [GSI]
Name: 2020-2021 SAR Seasonal Flood Map [GSI]
Display Field: flood_ID
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>The map shows observed peak flood extents which took place between Autumn 2020 and Summer 2021. </SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>The map was made using Synthetic Aperture Radar (SAR) images from the Copernicus Programme Sentinel-1 satellites. SAR systems emit radar pulses and record the return signal at the satellite. Flat surfaces such as water return a low signal. Based on this low signal, SAR imagery can be classified into non-flooded and flooded (i.e. flat) pixels.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>Flood extents were created using Python 2.7 algorithms developed by Geological Survey Ireland. They were refined using a series of post processing filters. Please read the lineage for more information.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>The flood map shows flood extents which have been observed to occur. A lack of flooding in any part of the map only implies that a flood was not observed. It does not imply that a flood cannot occur in that location at present or in the future.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>This flood extent map is to the scale 1:20,000. This means it should be viewed at that scale. When printed at that scale 1cm on the map relates to a distance of 200m.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>It is a vector dataset. Vector data portray the world using points, lines, and polygons (areas). The flood extents are shown as polygons. Each polygon has information on the confidence of the flood extent (high, medium or low), a flood id and a unique id.</SPAN></P></DIV></DIV></DIV>
Service Item Id: b67e2f3699d248a2ab90c0b0c880c180
Copyright Text: Contains Irish Public Sector Data (Geological Survey Ireland) licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 (CC BY-NC-ND 4.0) International Licence
Default Visibility: false
MaxRecordCount: 2000
Supported Query Formats: JSON, geoJSON, PBF
Min Scale: 0
Max Scale: 0
Effective Max Scale: 10000
Supports Advanced Queries: true
Supports Statistics: true
Has Labels: false
Can Modify Layer: true
Can Scale Symbols: false
Use Standardized Queries: true
Supports Datum Transformation: true
Extent:
XMin: 433885
YMin: 525885
XMax: 731645
YMax: 956485
Spatial Reference: 2157
(2157)
Drawing Info:
Renderer:
Unique Value Renderer:
Field 1: confidence
Field 2: N/A
Field 3: N/A
Field Delimiter: ,
Default Symbol:
Default Label: N/A
UniqueValueInfos:
-
Value: high
Label: High Confidence
Description: N/A
Symbol:
Style: esriSFSSolid
Color:
[255, 35, 15, 255]
Outline:
-
Value: medium
Label: Medium Confidence
Description: N/A
Symbol:
Style: esriSFSSolid
Color:
[237, 103, 25, 255]
Outline:
-
Value: low
Label: Low Confidence
Description: N/A
Symbol:
Style: esriSFSSolid
Color:
[255, 175, 1, 255]
Outline:
Transparency: 60
Labeling Info:
Advanced Query Capabilities:
Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
HasZ: false
HasM: false
Has Attachments: false
HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText
Type ID Field: null
Fields:
-
OBJECTID
(
type: esriFieldTypeOID, alias: OBJECTID
)
-
FLOOD_ID
(
type: esriFieldTypeInteger, alias: Flood ID
)
-
CONFIDENCE
(
type: esriFieldTypeString, alias: Confidence, length: 7
,
Coded Values:
[high: High Confidence]
,
[low: Low Confidence]
,
[medium: Medium Confidence]
)
-
SAR2021_ID
(
type: esriFieldTypeString, alias: GSI Unique ID, length: 25
)
Supported Operations:
Query
Query Attachments
Generate Renderer
Return Updates
Iteminfo
Thumbnail
Metadata