Geopolitical Units adjusted within Administrative Forest Boundaries: Congressional Districts FS revised 2020 Census (Feature Layer)

The USDA Forest Service Rapid Assessment of Vegetation Condition after Wildfire (RAVG) program produces geospatial and related data representing post-fire vegetation condition by means of standardized change detection methods based on Landsat or similar multispectral satellite imagery. RAVG data products characterize the impact of disturbance (fire) on vegetation within a fire perimeter, and include estimates of percent change in live basal area (BA), percent change in canopy cover (CC), and the standardized composite burn index (CBI). Standard thematic products include 7-class percent change in basal area (BA-7), 5-class percent change in canopy cover (CC-5), and 4-class CBI (CBI-4). Contingent upon the availability of suitable imagery, RAVG products are prepared for all wildland fires reported within the conterminous United States (CONUS) that include at least 1000 acres of forested National Forest System (NFS) land (500 acres for Regions 8 and 9 as of 2016). Data for individual fires are typically made available within 45 days after fire containment ("initial assessments"). Late-season fires, however, may be deferred until the following spring or summer ("extended assessments"). Annual national mosaics of each thematic product are prepared at the end of the fire season and updated, as needed, when additional fires from the given year are processed. The annual mosaics are available via the Raster Data Warehouse (RDW, see https://apps.fs.usda.gov/arcx/rest/services/RDW_Wildfire). A combined perimeter dataset, including the burn boundaries for all published Forest Service RAVG fires from 2012 to the present, is likewise updated as needed (at least annually). This current dataset is derived from the combined perimeter dataset and adds spatial information about land ownership (National Forest) and wilderness status, as well as the areal extent of forested land (pre-fire) that experience a modeled BA loss above 50 and 75 percent.This record was taken from the USDA Enterprise Data Inventory that feeds into the https://data.gov catalog. Data for this record includes the following resources: ISO-19139 metadata ArcGIS Hub Dataset ArcGIS GeoService OGC WMS CSV Shapefile GeoJSON KML For complete information, please visit https://data.gov.

美国农业部森林服务局迅速评估植被状况后野火（RAVG）项目，通过基于Landsat或类似多光谱卫星影像的标准化变化检测方法，生产出表示火灾后植被状况的地理空间及相关数据。RAVG数据产品描述了干扰（火灾）对火灾区域内植被的影响，并包括活立木断面积（BA）百分比变化、树冠覆盖（CC）百分比变化以及标准化综合燃烧指数（CBI）的估算。标准主题产品包括7类基面积百分比变化（BA-7）、5类树冠覆盖百分比变化（CC-5）和4类CBI（CBI-4）。根据适宜影像的可用性，RAVG产品为美国大陆范围内报告的所有至少包含1000英亩国家森林系统（NFS）林地（截至2016年，第八区和第九区为500英亩）的野火（“初始评估”）进行准备。然而，晚季火灾可能推迟至次年春季或夏季（“扩展评估”）。每种主题产品的年度国家镶嵌图在火灾季节结束时准备，并在处理给定年份的额外火灾时按需更新。年度镶嵌图可通过栅格数据仓库（RDW，请参阅https://apps.fs.usda.gov/arcx/rest/services/RDW_Wildfire）获取。包括自2012年以来所有已发布森林服务RAVG火灾的燃烧边界在内的综合边界数据集，也根据需要更新（至少每年一次）。当前数据集源自综合边界数据集，并增加了关于土地所有权（国家森林）和荒野状态的空间信息，以及经历模拟BA损失超过50%和75%的森林土地（火灾前）的面积范围。本记录来自为https://data.gov目录提供数据的美国农业部企业数据目录。本记录的数据包括以下资源：ISO-19139元数据、ArcGIS Hub数据集、ArcGIS GeoService、OGC WMS、CSV、Shapefile、GeoJSON。如需完整信息，请访问https://data.gov。