Skip to main content

Annual California Sea Otter Census: 2016 Range Extent Shapefile

Dates

Publication Date
Start Date
2016-05-01
End Date
2016-05-11

Citation

Tinker, M.T., and Hatfield, B.B., 2016, Annual California Sea Otter Census - 2016 Spring Census Summary: U.S. Geological Survey data release, http://dx.doi.org/10.5066/F7FJ2DWJ.

Summary

The GIS shapfile "Range extent of southern sea otter 2016" is a simple polyline representing the geographic distribution of the southern sea otter (Enhydra lutris nereis) in mainland California, based on data collected during the spring 2016 range-wide census. The USGS range-wide sea otter census has been undertaken twice a year since 1982, once in May and once in October, using consistent methodology involving both ground-based and aerial-based counts. The spring census is considered more accurate than the fall count, and provides the primary basis for gauging population trends by State and Federal management agencies. Sea otter distribution in California (the mainland range) is considered to comprise a band of potential habitat stretching [...]

Contacts

Point of Contact :
M. Tim Tinker
Originator :
M. Tim Tinker, Brian Hatfield
Metadata Contact :
William M Perry
Distributor :
U.S. Geological Survey - ScienceBase

Attached Files

Click on title to download individual files attached to this item.

Shapefile: Range Extent of southern sea otters 2016.zip
Range Extent of southern sea otters 2016.CPG 5 Bytes
Range Extent of southern sea otters 2016.dbf 73 Bytes
Range Extent of southern sea otters 2016.prj 468 Bytes
Range Extent of southern sea otters 2016.sbn 132 Bytes
Range Extent of southern sea otters 2016.sbx 116 Bytes
Range Extent of southern sea otters 2016.shp 15.65 KB
Range Extent of southern sea otters 2016.shx 108 Bytes

Purpose

The range-wide census is conducted to monitor trends in abundance of the southern sea otter, and thus provide State and Federal resource agencies with the information they need for effective management. Because the censuses represent uncorrected total counts (rather than sample-based surveys), they cannot be considered as accurate estimates of true population abundance. Instead, these data represent a valuable time-series of index counts, and provide the means of assessing spatial and temporal trends in relative abundance and distribution. The range extent GIS layer is useful for evaluating the range expansion of the sea otter population over time, and for identifying areas where significant sea otter impacts on near-shore marine communities are likely to occur.

Rights

The authors of these data require that data users contact them regarding intended use and to assist with understanding limitations and interpretation. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Map

Spatial Services

ScienceBase WMS

ScienceBase WFS

Communities

  • USGS Western Ecological Research Center

Tags

Provenance

Data source
Input directly

Additional Information

Shapefile Extension

boundingBox
minY34.418157191773965
minX-122.37337670778538
maxY37.19621975111545
maxX-120.27346114485816
files
nameRange Extent of southern sea otters 2016.CPG
contentTypetext/plain
pathOnDisk__disk__89/6d/4a/896d4a07c81dc36cd563e8fc55c0bb0181fd8c02
size5
dateUploadedThu Aug 04 12:24:10 MDT 2016
nameRange Extent of southern sea otters 2016.dbf
contentTypeapplication/unknown
pathOnDisk__disk__9b/12/8d/9b128de2c47c93834fc5aa9733bebf0dfbb81d04
size73
dateUploadedThu Aug 04 12:24:10 MDT 2016
nameRange Extent of southern sea otters 2016.prj
contentTypetext/plain
pathOnDisk__disk__b6/c5/59/b6c5593fbf54aba237c87eb44b0bcf4b099c05e0
size468
dateUploadedThu Aug 04 12:24:10 MDT 2016
nameRange Extent of southern sea otters 2016.sbn
contentTypex-gis/x-shapefile
pathOnDisk__disk__39/f0/fa/39f0face0cabdc3dcc305bb4824dfc45343d99bd
size132
dateUploadedThu Aug 04 12:24:10 MDT 2016
nameRange Extent of southern sea otters 2016.sbx
contentTypex-gis/x-shapefile
pathOnDisk__disk__ec/82/75/ec827531c4f0e42ec7aa03975974da0bc0ddc883
size116
dateUploadedThu Aug 04 12:24:10 MDT 2016
nameRange Extent of southern sea otters 2016.shp
contentTypex-gis/x-shapefile
pathOnDisk__disk__d1/90/8d/d1908d9a8266f995cb9ec0c801c29b5a911c9a20
size16028
dateUploadedThu Aug 04 12:24:11 MDT 2016
nameRange Extent of southern sea otters 2016.shx
contentTypex-gis/x-shapefile
pathOnDisk__disk__2f/90/88/2f90880ef078b94278ee60d5e673069a400caabd
size108
dateUploadedThu Aug 04 12:24:11 MDT 2016
nameRange Extent of southern sea otters 2016_FGDC.xml
contentTypeapplication/fgdc+xml
pathOnDisk__disk__ec/6f/8a/ec6f8a38c67abaf628ea5d58b0be0ed7b183e14a
dateUploadedThu Aug 27 22:38:18 MDT 2020
originalMetadatatrue
checksum
valuecf1b968c722c3b16a9dcdc6c9d69b3a1
typeMD5
geometryTypeMultiLineString
nameRange Extent of southern sea otters 2016
nativeCrsEPSG:3310

Item Actions

View Item as ...

Save Item as ...

View Item...