Description: "Significant Ecological area (SEA)" means an area that is determined to possess an example of biotic resources that cumulatively represent biological diversity, for the purposes of protecting biotic diversity, as part of the Los Angeles County general plan or the city's general plan. UPDATE HISTORY:12/27/12 - for the updated Santa Clarita Valley Area Plan going into effect. 9/5/13 - to take out insignificant parcel portions (slivers and portions of parcels less than 100 sq. feet) as decided on at a Project Review meeting on 8/5/13 - Management and County Counsel present. SEA numbers in newly adopted Santa Clarita Valley Area Plan also taken out.6/17/15 - updated the SEAs in the Antelope Valley following final Board adoption on 6/16/15.11/5/15 - following effective date of General Plan, all boundary adjustments within the General Plan area were incoroporated into this layer.
Copyright Text: County of Los Angeles
Department of Regional Planning
GIS Section
Description: These data identify the areas (in general) where crticial habitat for threatened species reside. UPDATED - 12/4/14 - data current as of October, 2014. Below is a list of species in Los Angeles County and their Federal Register info (spreadsheet can be found in OTHER_AGENCIES/USFWS/2014_Download)Brodiaea, Thread-Leaved (Brodiaea filifolia)Federal Register (Feb 8, 2011)Butterfly, Palos Verdes Blue (Glaucopsyche lygdamus palosverdesensis)Federal Register (Jul 2, 1980)Condor, California (Gymnogyps californianus)Federal Register (Sep 22, 1977)Flycatcher, Southwestern Willow (Empidonax traillii extimus)Federal Register (Jan 3, 2013)Frog, California red-legged (Rana draytonii)Federal Register (Mar 17, 2010)Frog, Mountain Yellow-Legged (Rana muscosa)Federal Register (Sep 14, 2006)Gnatcatcher, Coastal California (Polioptila californica californica)Federal Register (Dec 19, 2007)Goby, Tidewater (Eucyclogobius newberryi)Federal Register (Feb 6, 2013)Milk-vetch, Braunton's (Astragalus brauntonii)Federal Register (Nov 14, 2006)Navarretia, Spreading (Navarretia fossalis)Federal Register (Oct 7, 2010)Pentachaeta, Lyon's (Pentachaeta lyonii)Federal Register (Nov 14, 2006)Plover, western snowy (Charadrius nivosus ssp. nivosus)Federal Register (Jun 19, 2012)Steelhead (Oncorhynchus (=salmo) mykiss)Federal Register (Sep 2, 2005)Sucker, Santa Ana (Catostomus santaanae)Federal Register (Dec 14, 2010)Toad, arroyo (Anaxyrus californicus)Federal Register (Feb 9, 2011)Tortoise, Desert (Gopherus agassizii)Federal Register (Feb 8, 1994)Vireo, Least Bell's (Vireo bellii pusillus)Federal Register (Feb 2, 1994)
Description: Established in 1982, Government Code Section 65570 mandates FMMP to biennially report on the conversion of farmland and grazing land, and to provide maps and data to local government and the public. Updated, 4/29/25 for latest data for 2020.
Copyright Text: A citation for the Farmland Mapping and Monitoring Program on any map products, graphic media, or data analyses based on the data is appreciated.
Description: One-mile buffer polygons created and dissolved around areas containing Juniper and Joshua (with which Juniper often co-occurs) retrieved from the California Department of Forestry and Fire Protection Fire and Resource Assessment Program (FRAP) map of California vegetation.
Copyright Text: County of Los Angeles, Dept. of Regional Planning, GIS Section
Contact Information:
Joseph Decruyenaere, Biologist
jdecruyenaere@planning.lacounty.gov
(213) 974-1448
Description: Significant ridgelines that have been adopted by several CSDs or Plans within in the unincorporated parts of the county.UPDATE HISTORY:2/27/13 - for the Santa Clarita Valley Area Plan update.9/8/14 - to delete a ridgeline that was taken out per the Agua Dulce CSD that was Adopted by the Board of Supervisors on 3/4/14.10/22/14 - to update ridgelines as a result of the final certification of the Santa Monica Mountains Coastal Plan.11/21/18 - updated for Plum Canyon / Skyline Ranch / North Sand Canyon Annexation. This annexation was effective on 11/15/18, and a link to the official LAFCO annexation document is here.9/9/21 - updated for the adoption of Leona Valley CSD update on 8/10/21 (became effective on this date).12/20/22 - updated for Reorganization (Tesoro Del Valle) between Santa Clarita and Santa Clarita Valley. Effective on 11/14/22.6/21/24 - added ridgelines in the East San Gabriel Valley Area Plan after the adoption of that plan update. For the mapping of these ridgelines, click here.
Copyright Text: County of Los Angeles
Department of Regional Planning
GIS Section
Description: ADDED TO SDE 11/30/16. Downloaded from this website. Data current as of May 1, 2016.This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). The National Wetlands Inventory - Version 2, Surface Waters and Wetlands Inventory was derived by retaining the wetland and deepwater polygons that compose the NWI digital wetlands spatial data layer and reintroducing any linear wetland or surface water features that were orphaned from the original NWI hard copy maps by converting them to narrow polygonal features. Additionally, the data are supplemented with hydrography data, buffered to become polygonal features, as a secondary source for any single-line stream features not mapped by the NWI and to complete segmented connections. Wetland mapping conducted in WA, OR, CA, NV and ID after 2012 and most other projects mapped after 2015 were mapped to include all surface water features and are not derived data. The linear hydrography dataset used to derive Version 2 was the U.S. Geological Survey's National Hydrography Dataset (NHD). Specific information on the NHD version used to derive Version 2 and where Version 2 was mapped can be found in the 'comments' field of the Wetlands_Project_Metadata feature class. Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and near shore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery. By policy, the Service also excludes certain types of "farmed wetlands" as may be defined by the Food Security Act or that do not coincide with the Cowardin et al. definition. Contact the Service's Regional Wetland Coordinator for additional information on what types of farmed wetlands are included on wetland maps. This dataset should be used in conjunction with the Wetlands_Project_Metadata layer, which contains project specific wetlands mapping procedures and information on dates, scales and emulsion of imagery used to map the wetlands within specific project boundaries.
Copyright Text: U.S. Fish and Wildlife Service
National Wetlands Inventory
Description: This layer is a version of the USFWS Wetlands layer with a 100 foot buffer around LA County Wetlands. Downloaded and added to SDE 04/24/2024. Downloaded from this website. Data current as of 10/23/2023.This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). The National Wetlands Inventory - Version 2, Surface Waters and Wetlands Inventory was derived by retaining the wetland and deepwater polygons that compose the NWI digital wetlands spatial data layer and reintroducing any linear wetland or surface water features that were orphaned from the original NWI hard copy maps by converting them to narrow polygonal features. Additionally, the data are supplemented with hydrography data, buffered to become polygonal features, as a secondary source for any single-line stream features not mapped by the NWI and to complete segmented connections. Wetland mapping conducted in WA, OR, CA, NV and ID after 2012 and most other projects mapped after 2015 were mapped to include all surface water features and are not derived data. The linear hydrography dataset used to derive Version 2 was the U.S. Geological Survey's National Hydrography Dataset (NHD). Specific information on the NHD version used to derive Version 2 and where Version 2 was mapped can be found in the 'comments' field of the Wetlands_Project_Metadata feature class. Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and near shore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery. By policy, the Service also excludes certain types of "farmed wetlands" as may be defined by the Food Security Act or that do not coincide with the Cowardin et al. definition. Contact the Service's Regional Wetland Coordinator for additional information on what types of farmed wetlands are included on wetland maps. This dataset should be used in conjunction with the Wetlands_Project_Metadata layer, which contains project specific wetlands mapping procedures and information on dates, scales and emulsion of imagery used to map the wetlands within specific project boundaries.
Copyright Text: U.S. Fish and Wildlife Service
National Wetlands Inventory
Description: A Linkage Design addresses the potential movement needs for several focal species. For more details on the methods used for creating each Linkage Design refer to the individual linkage reports here, in the 'South Coast Missing Linkages' section. This 'Linkage Designs' feature class delineates the outer-boundaries of 12 critical landscape linkages identified by the South Coast Missing Linkages Project. The 3 cross-border landscape linkages are not included in this generalized feature class.
