Washington Department of Fish and Wildlife
North Olympic Salmon Coalition
Friends of the San Juans
08/01/2008
Documented Sand Lance Spawning
vector digital data
Olympia, Washington
Washington Department of Fish and Wildlife
These data represent the documented intertidal spawning habitat for Pacific sand lance (Ammodytes hexapterus) in western Washington's marine waters. Sand lance, along with surf smelt (Hypomesus pretiosus) and Pacific herring (Clupea harengus) are collectively referred to as forage fish. They are important prey for many species of mammals, birds and fish, including salmon. Sand lance spawn in the upper intertidal zone of beaches comprised of mixed sand and gravel. These fine-grained spawning substrates are susceptible to nearshore development where substrate coarsening may reduce available habitat. The accurate representation of forage fish spawning habitat and delivery of those data to public sources is necessary for the conservation of these species.
To document the distribution of intertidal spawning habitat for Pacific sand lance. These data provide guidence for protection and restoration activities.
The line segments portrayed in this feature class were derived from survey locations specified in the Forage Fish Survey Points feature class. The points were snapped to a routed shoreline based on Washington Department of Natural Resources (WDNR) Shorezone Inventory. Arcs were generated from the routed shoreline for each survey point located within 200 feet of the shoreline. The arc length was based on the beach length attribute, with the point being the center of the arc.
Beach lengths were estimated in the field for surveys conducted after September 1991. Beach length estimates were sporadic for prior surveys. Where beach length estimates were missing, values were assigned based on the following method. First, a nearest point analysis was performed against surveys with beach length estimates. Beach length values were taken from the nearest survey point within a 750 foot buffer. Where no surveys occurred within the buffer, values of 1000 feet were assigned. The origin of the beach length value is represented in the Beach_Length_Src attribute.
Some spits, saltwater marshes, and other shoreline features that represent spawning habitat are not defined by the routed shoreline and thus not all documented sand lance spawning beaches are displayed in this feature class. These situations can be identified by using this layer in conjunction with the Forage Fish Survey Points feature class. The missing surveys for documented sand lance spawn can be displayed as points by selecting those Forage Fish Survey Points records whose Shoreline_Snap_Ind attribute value equals zero (0) and Sand_Lance_Ind attribute value equals one (1).
19720410
20080731
ground condition
As needed
-124.394323
-122.251816
49.014993
46.913025
None
biota
forage fish
Pacific sand lance
spawning
intertidal
habitat
None
Washington
Puget Sound
Strait of Juan de Fuca
Pacific coast
Hood Canal
San Juan Islands
Strait of Georgia
None
Any products derived from these data should reference Washington Department of Fish and Wildlife as the source.
Dan Penttila
Washington Depatment of Fish and Wildlife
Fish & Wildlife Biologist
mailing address
PO Box 1100
LaConner
Washington
98257
USA
360-466-4345 ext 242
penttdep@dfw.wa.gov
The majority of these data were collected by WDFW staff with contributions from the North Olympic Salmon Coalition and the Friends of the San Juans.
Unclassified
ESRI ArcCatalog 9.2.2.1350
This data set is compiled from multiple sources. WDFW is not responsible for the accuracy of data collected by non-WDFW entities. Habitat conditions reflected in this data set may have changed since the data was collected and recorded.
Some spits, saltwater marshes, and other shoreline features that represent spawning habitat are not defined by the routed shoreline and thus not all documented sand lance spawning beaches are displayed in this feature class. These situations can be identified by using this layer in conjunction with the Forage Fish Survey Points feature class. The Forage Fish Survey Points feature class can be set to display survey points where sand lance spawning was documented by selecting the SAND_LANCE_IND attribute equal to one (1). The missing beaches will be displayed as points only rather than points and lines.
Positional data were derived using several methods over the duration of the sampling effort. Surveys conducted prior to September 1993 were plotted using 1:24000 USGS quadrangle maps and have an estimated accuracy of 100 meters or better. Surveys conducted between September 1993 and May 2000 utilized consumer grade GPS units and were subject to signal degradation from selective availability. These positions were compared to 1:24000 USGS quadrangle "field maps", where GPS positions deviated more than 61 meters from the field estimated positions, the field estimated positions were used. Accuracy is estimated to be within 100 meters. Surveys conducted since May 2000 utilized consumer grade GPS units with estimated accuracies of 15 meters. Accuracy of positional data received from groups or agencies outside the Department of Fish and Wildlife can not be guaranteed.
Vertical accuracy has yet to the determined.
Dataset copied.
Dataset copied.
Dataset copied.
20100702
08364500
Vector
Simple
FALSE
0
TRUE
TRUE
coordinate pair
0.000328
0.000328
survey feet
D_North_American_1983_HARN
Geodetic Reference System 80
6378137.000000
298.257222
1.000000
Explicit elevation coordinate included with horizontal coordinates
Doc_Sand_Lance_Spawning
ArcGIS Geodatabase. Compilation of forage fish intertidal spawning habitat surveys where Pacific sand lance spawning was documented.
ESRI
Feature Class
0
OBJECTID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
OBJECTID
OID
4
10
0
Shape
Feature geometry.
ESRI
Coordinates defining the feature.
Shape
Geometry
4
0
0
Survey_Dat
Survey_Dat
Date
8
0
0
Station_Nu
Station_Nu
String
50
0
0
Beach_Leng
Beach_Leng
Integer
4
10
0
Beach_Le_1
Beach_Le_1
String
7
0
0
Data_Sourc
Data_Sourc
String
15
0
0
Lat_WGS84_
Lat_WGS84_
Double
8
38
8
Long_WGS84
Long_WGS84
Double
8
38
8
Shape_Leng
Shape_Leng
Double
8
38
8
Survey_Id
Unique survey record identification number assigned Forage Fish SQL database.
Sequential unique whole numbers that are automatically generated.
Survey_Id
Integer
4
10
0
Shape.STLength()
Shape.STLength()
Double
0
0
0
The attribute data consist of survey date, survey station number, beach length, beach length source, data source, latitude and longitude.
A data dictionary for this dataset is not yet available.
Brian Benson
Washington Department of Fish and Wildlife
Data Manager
mailing address
600 Capitol Way North
Olympia
Washington
98501
USA
(360) 902-2570
(360) 902-2207
(360) 902-2946
bensoblb@dfw.wa.gov
8:00 a.m. to 4:00 p.m. Monday through Friday
Intertidal forage fish spawning habitat surveys.
The Washington Department of Fish and Wildlife (WDFW) makes no warranty of fitness for a particular purpose and assumes no liability for the data represented here. These data do not represent exhaustive inventories, but are compilations of existing knowledge from field biologists that are updated periodically as knowledge improves. This data should be used cautiously because they are not exhaustive, and are subject to change. When conducting projects or planning for fish and wildlife, please consider using additional information gathered from field investigations and consultations with WDFW or other professional biologists
Contact data manager via telephone or email.
Approximately two weeks.
Contact data manager via telephone or email.
Requires ESRI ArcMap version 9.x.
20080818
Washington State Department of Fish and Wildlife
Brian Benson
Data Manager
mailing address
600 Capitol Way North
Olympia
Washington
98501
USA
(360) 902-2570
(360) 902-2207
(360) 902-2946
bensoblb@dfw.wa.gov
8:00 a.m. to 4:00 p.m. Monday through Friday
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
20120109
13044600
1.0
FALSE
Sand_Lance_Spawning
002
Projected
GCS_WGS_1984
Linear Unit: Meter (1.000000)
WGS_1984_Web_Mercator_Auxiliary_Sphere
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20210209
10581500
20210209
10581500
Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362
Sand_Lance_Spawning
Feature Class
dataset
EPSG
8.8(9.3.1.2)
0
20210209