Elk Home Range - Timmons - 2017-2021 [ds2998]
type: Dataset
description: The project lead for the collection of this data was Carrington Hilson. Elk (2 adult females) were captured and equipped with GPS collars (Lotek Iridium) transmitting data from 2017-2021. The Timmons herd does not migrate between traditional summer and winter seasonal ranges. Therefore, annual home ranges were modeled using year-round data to demarcate high use areas in lieu of modeling the specific winter ranges commonly seen in other ungulate analyses in California. GPS locations were fixed between 1-6 hour intervals in the dataset. To improve the quality of the data set as per Bjørneraas et al. (2010), the GPS data were filtered prior to analysis to remove locations which were: i) further from either the previous point or subsequent point than an individual pronghorn is able to travel in the elapsed time, ii) forming spikes in the movement trajectory based on outgoing and incoming speeds and turning angles sharper than a predefined threshold , or iii) fixed in 2D space and visually assessed as a bad fix by the analyst. The methodology used for this migration analysis allowed for the mapping of the herd''s home range. Brownian bridge movement models (BBMMs; Sawyer et al. 2009) were constructed with GPS collar data from 2 elk, including 6 annual home range sequences, location, date, time, and average location error as inputs in Migration Mapper. BBMMs were produced at a spatial resolution of 50 m using a sequential fix interval of les than 27 hours. Large water bodies were clipped from the final output. Home range is visualized as the 50thpercentile contour (high use) and the 99thpercentile contour of the year-round utilization distribution. Home range designations for this herd may expand with a larger sample.
issued: 2022-03-17T19:13:39+00:00
modified: 2022-03-17T19:13:51.453000+00:00
contact point: Organization
  fn: BIOS_Admin
keyword: amerigeo
keyword: amerigeoss
keyword: authcdfw
keyword: brownian-bridge-movement-model
keyword: california
keyword: california-department-of-fish-and-wildlife
keyword: california-natural-resources-agency
keyword: caopendata
keyword: cdfw
keyword: cervus-canadensis
keyword: ckan
keyword: connectivity
keyword: ds299820220303wm
keyword: elk
keyword: geo
keyword: geoss
keyword: gps
keyword: home-range
keyword: humboldt
keyword: migration-mapper
keyword: national
keyword: north-america
keyword: north-coast
keyword: telemetry
keyword: united-states
theme: {"Natural Resources"
theme: Water}

GeoJSON
type: Distribution
format: GeoJSON
issued: 2022-04-28T02:02:18.726394
modified: 2025-11-20T14:48:21.434880
access URL: https://gis.data.cnra.ca.gov/datasets/CDFW::elk-home-range-timmons-2017-2021-ds2998.geojson
media type: application/geo+json

ArcGIS GeoService
type: Distribution
format: ArcGIS GeoServices REST API
issued: 2022-04-28T02:02:18.726388
modified: 2025-11-20T14:48:21.434479
access URL: https://services2.arcgis.com/Uq9r85Potqm3MfRV/arcgis/rest/services/biosds2998_fpu/FeatureServer/0
media type: application/octet-stream

KML
type: Distribution
format: KML
issued: 2022-04-28T02:02:18.726404
modified: 2025-11-20T14:48:21.435690
access URL: https://gis.data.cnra.ca.gov/datasets/CDFW::elk-home-range-timmons-2017-2021-ds2998.kml
media type: application/vnd.google-earth.kml+xml

CSV
type: Distribution
format: CSV
issued: 2022-04-28T02:02:18.726399
modified: 2025-11-20T14:48:21.435280
access URL: https://gis.data.cnra.ca.gov/datasets/CDFW::elk-home-range-timmons-2017-2021-ds2998.csv
media type: text/csv

ArcGIS Hub Dataset
type: Distribution
format: HTML
issued: 2022-04-28T02:02:18.726376
modified: 2025-11-20T14:48:21.434034
access URL: https://gis.data.cnra.ca.gov/maps/CDFW::elk-home-range-timmons-2017-2021-ds2998

Shapefile
type: Distribution
format: ZIP
issued: 2022-04-28T02:02:18.726409
modified: 2025-11-20T14:48:21.436087
access URL: https://gis.data.cnra.ca.gov/datasets/CDFW::elk-home-range-timmons-2017-2021-ds2998.zip
media type: application/zip

US Migrating
type: Agent