California Land Ownership

This ownership dataset utilizes a methodology that results in a federal ownership extent that matches the Federal Responsibility Areas (FRA) footprint from CAL FIRE's State Responsibility Areas for Fire Protection (SRA) data. FRA lands are snapped to county parcel data, thus federal ownership areas will also be snapped. Since SRA Fees were first implemented in 2011, CAL FIRE has devoted significant resources to improve the quality of SRA data. This includes comparing SRA data to data from other federal, state, and local agencies, an annual comparison to county assessor roll files, and a formal SRA review process that includes input from CAL FIRE Units. As a result, FRA lands provide a solid basis as the footprint for federal lands in California (except in the southeastern desert area). The methodology for federal lands involves: 1) snapping federal data sources to parcels; 2) clipping to the FRA footprint; 3) overlaying the federal data sources and using a hierarchy when sources overlap to resolve coding issues (BIA, UFW, NPS, USF, BLM, DOD, ACE, BOR); 4) utilizing an automated process to merge “unknown” FRA slivers with appropriate adjacent ownerships; and 5) a manual review of FRA areas not assigned a federal agency by this process. Non-Federal ownership information was obtained from the California Protected Areas Database (CPAD), was clipped to the non-FRA area, and an automated process was used to fill in some sliver-gaps that occurred between the federal and non-federal data. Southeastern Desert Area: CAL FIRE does not devote the same level of resources for maintaining SRA data in this region of the state, since we have no fire protection responsibility. This includes almost all of Imperial County, and the desert portions of Riverside, and San Bernardino Counties. In these areas, we used federal protection areas from the current version of the Direct Protection Areas (DPA) dataset. Due to the fact that there were draw-issues with the previous version of ownership, this version does NOT fill in the areas that are not assigned to one of the owner groups (it does not cover all lands in the state). Also unlike previous versions of the dataset, this version only defines ownership down to the agency level - it does not contain more specific property information (for example, which National Forest). The option for a more detailed future release remains, however, and due to the use of automated tools, could always be created without much additional effort.This dataset includes a representation to symbolize based on the Own_Group field using the standard color scheme utilized on DPA maps.For more details about data inputs, see the Lineage section of the metadata. For detailed notes on previous versions, see the Supplemental Information section of the metadata.本权属数据集采用的方法可使联邦权属范围与加州消防局（CAL FIRE）的州消防责任区域（State Responsibility Areas for Fire Protection, SRA）数据中的联邦责任区域（Federal Responsibility Areas, FRA）范围保持一致。联邦责任区域地块将匹配县级宗地数据，因此联邦权属区域亦将完成匹配。 自2011年SRA收费政策实施以来，加州消防局投入大量资源提升SRA数据质量，具体包括将SRA数据与其他联邦、州及地方机构的数据开展比对，每年与县评估员的档案文件进行校验，以及包含加州消防局各单位参与的正式SRA审核流程。 据此，联邦责任区域可作为加利福尼亚州联邦土地的可靠基底（东南部沙漠区域除外）。联邦土地的处理流程如下：1）将联邦数据源匹配至县级宗地；2）裁剪至联邦责任区域范围；3）叠加联邦数据源，并在数据源重叠时通过层级规则解决编码冲突（涉及印第安事务局（BIA）、美国鱼类及野生动物管理局（UFW）、国家公园管理局（NPS）、美国鱼类及野生动物局（USF）、土地管理局（BLM）、国防部（DOD）、陆军工程兵团（ACE）、垦务局（BOR））；4）利用自动化流程将"未知"的联邦责任区域窄条地块与相邻的对应权属地块合并；5）人工审核本流程未分配至联邦机构的联邦责任区域。 非联邦权属信息源自加利福尼亚保护区域数据库（California Protected Areas Database, CPAD），先裁剪至非联邦责任区域范围，再通过自动化流程填补联邦与非联邦数据间出现的部分窄条间隙。 东南部沙漠区域：由于加州消防局无该区域的消防管护责任，因此未投入同等资源维护SRA数据，该区域几乎涵盖帝国县全部范围，以及河滨县与圣贝纳迪诺县的沙漠片区。在此类区域中，我们采用了当前版本的直接保护区域（Direct Protection Areas, DPA）数据集中的联邦保护区域信息。 鉴于此前版本的权属数据存在绘制缺陷，本版本**未**填充未分配至任一权属组的区域（未覆盖全州所有土地）。与此前版本不同，本版本仅定义至机构层级的权属信息，不包含更具体的地块详情（例如某座国家森林的具体范围）。不过未来仍可推出更详细的版本，且由于采用了自动化工具，仅需少量额外工作即可完成。 本数据集包含基于Own_Group字段、采用直接保护区域地图标准配色方案进行符号化的表达。 如需了解数据输入的更多详情，请参阅元数据的谱系（Lineage）章节；如需查阅过往版本的详细说明，请参阅元数据的补充信息（Supplemental Information）章节。