Census 2020: Blocks for San Francisco

<strong>A. SUMMARY</strong>
Census blocks, the smallest geographic area for which the Bureau of the Census collects and tabulates decennial census data, are formed by streets, roads, railroads, streams and other bodies of water, other visible physical and cultural features, and the legal boundaries shown on Census Bureau maps. More information on the census tracts can be found <u><a href="https://www.census.gov/newsroom/blogs/random-samplings/2011/07/what-are-census-blocks.html">here</a></u>.

<strong>B. HOW THE DATASET IS CREATED</strong>
The boundaries are uploaded from TIGER/Line shapefiles provided by the <u><a href="https://www.census.gov/cgi-bin/geo/shapefiles/index.php?year=2021&layergroup=Blocks+%282020%29">U.S. Census Bureau</a></u>.

<strong>C. UPDATE PROCESS</strong>
This dataset is static. Changes to the census blocks are tracked in multiple datasets. See here for <u><a href="https://data.sfgov.org/d/94d7-d6m6">2000</a></u> and <u><a href="https://data.sfgov.org/d/2uzy-uv2r">2010</a></u> census tract boundaries.

<strong>D. HOW TO USE THIS DATASET</strong>
This boundary file can be joined to other census datasets on GEOID. Column descriptions can be found on in the <u><a href="https://www.census.gov/programs-surveys/geography/technical-documentation/complete-technical-documentation/tiger-geo-line.2020.html">technical documentation</a></u> included on the census.gov website

<strong>E. RELATED DATASETS</strong>
<u><a href="https://data.sfgov.org/d/tmph-tgz9">Census 2020: Census Tracts for San Francisco</a></u>
<u><a href="https://data.sfgov.org/d/sevw-6tgi">Analysis Neighborhoods - 2020 census tracts assigned to neighborhoods</a></u>
<u><a href="https://data.sfgov.org/d/e2st-aufe">Census 2020: Blocks for San Francisco Clipped to SF Shoreline</a></u>
<u><a href="https://data.sfgov.org/d/24e8-pd2q">Census 2020: Blocks Groups for San Francisco</a></u>
<u><a href="https://data.sfgov.org/d/6rf8-dnst">Census 2020: Blocks Groups for San Francisco Clipped to SF Shoreline</a></u>

{'A. 摘要': '人口普查地块，系人口普查局收集和汇总十年一次的人口普查数据的最低地理区域，由街道、道路、铁路、溪流及其他水体、其他可见的物理和文化特征，以及人口普查局地图上所示的法律边界构成。有关人口普查区划的更多信息，请参阅[此处](https://www.census.gov/newsroom/blogs/random-samplings/2011/07/what-are-census-blocks.html)。', 'B. 数据集创建方式': '边界数据从美国人口普查局提供的TIGER/Line形状文件中上传而来。[点击此处](https://www.census.gov/cgi-bin/geo/shapefiles/index.php?year=2021&layergroup=Blocks+%282020%29)访问。', 'C. 更新过程': '此数据集为静态数据集。人口普查地块的变更在其他多个数据集中进行追踪。请参阅[此处](https://data.sfgov.org/d/94d7-d6m6)和[此处](https://data.sfgov.org/d/2uzy-uv2r)查看2000年和2010年的人口普查区划边界。', 'D. 数据集使用方法': '此边界文件可与其他基于GEOID的普查数据集进行连接。列描述可在人口普查局网站上的[技术文档](https://www.census.gov/programs-surveys/geography/technical-documentation/complete-technical-documentation/tiger-geo-line.2020.html)中找到。', 'E. 相关数据集': [{'link': '[Census 2020: Census Tracts for San Francisco](https://data.sfgov.org/d/tmph-tgz9)'}, {'link': '[Analysis Neighborhoods - 2020 census tracts assigned to neighborhoods](https://data.sfgov.org/d/sevw-6tgi)'}, {'link': '[Census 2020: Blocks for San Francisco Clipped to SF Shoreline](https://data.sfgov.org/d/e2st-aufe)'}, {'link': '[Census 2020: Blocks Groups for San Francisco](https://data.sfgov.org/d/24e8-pd2q)'}, {'link': '[Census 2020: Blocks Groups for San Francisco Clipped to SF Shoreline](https://data.sfgov.org/d/6rf8-dnst)'}]}