ACE Irreplaceability (Rank 4 & 5)

The full Terrestrial Irreplaceability dataset is part of the Areas of Conservation Emphasis (ACE) project from CA Department of Fish and Wildlife (CDFW). ACE Terrestrial Irreplaceability provides a measure of the relative importance of an area based on the number of California endemic, special-status species found there, and the breadth of their distribution, so that species which are more geographically constrained produce a higher score. This geographic weighting system makes a site more ‘irreplaceable’ because it supports species which are found in fewer locations. Rare endemic species are identified by the California Species of Special Concern reports, the California Rare Plant Rank 1B plants, State or Federally-listed species (threatened, endangered, or candidate species), and fully-protected species. 

Ranks 4 and 5 are used as an exclusion in the biological planning priorities component of the Core and SB 100 Terrestrial Climate Resilience Study Screens. This ensures that areas of technical resource potential identified through screening avoid lands with higher conservation value for irreplaceability.This layer is featured in the CEC 2023 Land-Use Screens for Electric System Planning data viewer. 

For more information about this layer and its use in electric system planning, please refer to the Land Use Screens Staff Report in the CEC Energy Planning Library. 

Data and Resources

Field Value
accessLevel public
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
datagov_dedupe_retained 20250724164837
identifier 8268065f-9b56-4921-80ac-2667f88f136f
issued 2023-03-01T00:57:27.000Z
license http://www.opendefinition.org/licenses/cc-by
modified 2023-03-06T22:10:28.290Z
publisher California Energy Commission
resource-type Dataset
source_datajson_identifier true
source_hash d2b10edf04a16f4c5164554a606987432894c4e97b8c71a4ad46e9555b4131b3
source_schema_version 1.1
theme {"Natural Resources"}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • AmeriGEO
  • AmeriGEOSS
  • CKAN
  • GEO
  • GEOSS
  • National
  • North America
  • United States
  • california-energy-commission
  • california-natural-resources-agency
  • caopendata
  • sb-100
  • sb100
  • step
isopen False
license_id other-license-specified
license_title other-license-specified
maintainer tdavid_CAEnergy
maintainer_email gis@energy.ca.gov
metadata_created 2025-09-23T19:51:41.719387
metadata_modified 2025-09-23T19:51:41.719394
notes <div style='text-align:Left;'><p></p><p><span style='color:black;'>The full Terrestrial Irreplaceability dataset is part of the </span><a href='https://wildlife.ca.gov/Data/Analysis/ACE' target='_blank' rel='nofollow ugc noopener noreferrer'>Areas of Conservation Emphasis (ACE)</a><span style='color:black;'> project from CA Department of Fish and Wildlife (CDFW). </span><a href='https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150816&amp;inline' target='_blank' rel='nofollow ugc noopener noreferrer'>ACE Terrestrial Irreplaceability</a><span style='color:black;'> provides a measure of the relative importance of an area based on the number of California endemic, special-status species found there, and the breadth of their distribution, so that species which are more geographically constrained produce a higher score. This geographic weighting system makes a site more ‘irreplaceable’ because it supports species which are found in fewer locations. Rare endemic species are identified by the California Species of Special Concern reports, the California Rare Plant Rank 1B plants, State or Federally-listed species (threatened, endangered, or candidate species), and fully-protected species. </span></p> <p><span style='color:black;'>Ranks 4 and 5 are used as an exclusion in the biological planning priorities component of the Core and SB 100 Terrestrial Climate Resilience Study Screens. This ensures that areas of technical resource potential identified through screening avoid lands with higher conservation value for irreplaceability.</span></p><p><span style='color:black;'>This layer is featured in the </span><a href='https://experience.arcgis.com/experience/de6ab11146bf47068ff294d87780ce00' target='_blank' rel='nofollow ugc noopener noreferrer'>CEC 2023 Land-Use Screens for Electric System Planning</a><span style='color:black;'> data viewer. </span></p> <p><span style='color:black;'>For more information about this layer and its use in electric system planning, please refer to the </span><a href='https://www.energy.ca.gov/data-reports/california-energy-planning-library/land-use-screens' target='_blank' rel='nofollow ugc noopener noreferrer'>Land Use Screens Staff Report in the CEC Energy Planning Library.</a><span style='color:black;'> </span></p><br /><p></p></div>
num_resources 14
num_tags 14
title ACE Irreplaceability (Rank 4 & 5)