COVID-19 Cases by Geography and Date (archived)

This dataset has been retired as of February 17, 2023. This dataset will be kept for historical purposes, but will no longer be updated. Similar data are available on the state’s open data portal: https://data.chhs.ca.gov/dataset/covid-19-time-series-metrics-by-county-and-state.

A. DATASET DESCRIPTION
This dataset contains COVID-19 positive confirmed cases aggregated by several different geographic areas and by day. COVID-19 cases are mapped to the residence of the individual and shown on the date the positive test was collected. In addition, 2019 American Community Survey (ACS) 5-year population estimates are included to calculate the cumulative rate per 10,000 residents.

Dataset covers cases going back to March 18th, 2020 when the first person in Marin County tested positive for COVID-19. This data may not be immediately available for recently reported cases and data will change to reflect as information becomes available. Data updated daily.

COVID-19 case data undergo quality assurance and other data verification processes and are continually updated to maximize completeness and accuracy of information. This means data may change for previous days as information is updated.

Geographic areas summarized are:
1. City, Town, or Community Area
2. Census Tracts
3. Census ZIP Code Tabulation Areas (ZCTAs)

B. HOW THE DATASET IS CREATED
Addresses from the COVID-19 case data are geocoded by Marin County HHS. Those addresses are spatially joined to the geographic areas. Counts are generated based on the number of address points that match each geographic area for a given date.

The 2019 ACS estimates for population provided by the Census are used to create a cumulative rate which is equal to ([cumulative count up to that date] / [acs_population]) * 10000) representing the number of total cases per 10,000 residents (as of the specified date).

C. UPDATE PROCESS
Geographic analysis is scripted by Marin HHS staff and synced to this dataset each day.

D. HOW TO USE THIS DATASET
This dataset can be used to track the spread of COVID-19 throughout Marin County in a variety of geographic areas. Note that the new cases column in the data represents the number of new cases confirmed in a certain area on the specified day, while the cumulative cases column is the cumulative total of cases in a certain area as of the specified date.

Privacy rules in effect
To protect privacy, certain rules are in effect:
1. Any area with a cumulative case count less than 10 are dropped for all days the cumulative count was less than 10. These will be null values. For example if a zip code did not have 10 cumulative cases until June 1, 2020 that location will not be included in the dataset until June 1.
2. Once an area has a cumulative case count of 10 or greater, that area will have a new row of case data every day following.
3. 3. Cases are dropped altogether for areas where acs_population < 1000. Some adjacent geographic areas may be combined until the ACS population exceeds 1,000 to still provide information for these regions.

Note: 14-day case rate or 30-day case rate where the counts are lower than 20 may be unstable. We advise caution in interpreting rates at these small numbers.

A note on Census ZIP Code Tabulation Areas (ZCTAs)
ZIP Code Tabulation Areas are special boundaries created by the U.S. Census based on ZIP Codes developed by the USPS. They are not, however, the same thing. ZCTAs are areal representations of routes.

本数据集自2023年2月17日起已退役。出于历史目的，该数据集将予以保留，但将不再进行更新。类似数据可在州开放数据门户中获取：https://data.chhs.ca.gov/dataset/covid-19-time-series-metrics-by-county-and-state。

A. 数据集描述
本数据集包含按多个不同地理区域和日期汇总的COVID-19确诊病例。COVID-19病例根据个体居住地映射，并显示阳性检测样本采集的日期。此外，还包括2019年美国社区调查（ACS）五年人口估计值，以计算每10,000居民的累积发病率。
数据集涵盖自2020年3月18日以来发生的病例，当时马林县的第一位居民检测出COVID-19阳性。对于最近报告的病例，数据可能不会立即可用，且数据将根据信息更新而发生变化。数据每日更新。
COVID-19病例数据经过质量保证和其他数据验证流程，并持续更新，以确保信息的完整性和准确性。这意味着随着信息的更新，过去几天的数据可能会发生变化。
汇总的地理区域包括：
1. 城市、镇或社区区域
2. 人口普查区
3. 人口普查ZIP代码统计区域（ZCTA）

B. 数据集创建方式
COVID-19病例数据中的地址由马林县卫生与公众服务部门进行地理编码。这些地址与地理区域进行空间连接。基于特定日期匹配每个地理区域的地址点数量生成计数。
2019年美国社区调查（ACS）提供的人口估计值用于创建累积率，该累积率等于（至该日期为止的累积计数 / ACS人口）* 10000，表示每10,000居民的总病例数（截至指定日期）。

C. 更新过程
地理分析由马林县卫生与公众服务部门工作人员编写脚本，并每日同步到此数据集。

D. 如何使用此数据集
此数据集可用于跟踪COVID-19在马林县各个地理区域的传播情况。请注意，数据中的新增病例列表示在指定日期某个区域确认的新增病例数，而累积病例列表示截至指定日期某个区域的累积病例总数。
隐私规则
为保护隐私，实施以下规则：
1. 对于累积病例数少于10的任何区域，在累积病例数少于10的所有日期中，都将删除这些区域。这些值将显示为空值。例如，如果某个邮编直到2020年6月1日才达到10个累积病例，则该位置将不包括在数据集中，直到6月1日。
2. 一旦某个区域的累积病例数为10或更多，该区域将在之后每一天都有一行新的病例数据。
3. 对于ACS人口少于1000的区域，将删除所有病例。一些相邻的地理区域可能会合并，直到ACS人口超过1000，以仍为这些地区提供信息。
注意：14天病例率或30天病例率，如果计数低于20，则可能不稳定。我们建议在解释这些小数字的比率时谨慎行事。
关于人口普查ZIP代码统计区域（ZCTA）的说明
ZIP代码统计区域是美国人口普查局基于美国邮政局开发的ZIP代码创建的特殊边界。然而，它们并不相同。ZCTA是路线的空间表示。