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This polygon data is the product of 2020 census block group boundaries split by LA County legal city boundaries and unincorporated areas (commonly known as CSA) as well as by 2021 Supervisorial District boundaries. |
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This polygon data is the product of 2020 census block group boundaries split by LA County legal city boundaries and unincorporated areas (commonly known as CSA) as well as by 2021 Supervisorial District boundaries. |
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Census Bureau, Los Angeles County Internal Services Department (ISD), Los Angeles County Department of Public Work (DPW).
This polygon boundary data is created by ISD - GIS Section. |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN>This data is the product of 2020 census block group split by 2024 incorporated city boundaries and unincorporated community/countywide statistical areas (CSA) boundaries and 2021 Supervisorial District boundaries. The split block group boundaries have been altered and aligned where necessary with legal city boundaries and unincorporated areas, including along shoreline/coastal areas. This data is also known as the Split Tract data. </SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">Census Tract</SPAN><SPAN>:</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>The Census Bureau (</SPAN><A href="http://www.census.gov/)"><SPAN><SPAN>https://www.census.gov/)</SPAN></SPAN></A><SPAN><SPAN>released 2020 geographic boundaries data including census tracts for the analysis and mapping of demographic information across the United States. </SPAN></SPAN></P><P><SPAN STYLE="font-weight:bold;">Census Block Group</SPAN><SPAN>: </SPAN></P><P><SPAN>Block Groups (BGs) are statistical sub-divisions of census tracts, and are used to present data and control block numbering. A block group consist of cluster of blocks having the same first digit of their four-digit identifying number within the same census tract. BGs are generally defined to contain between 600 and 3,000 people and 240 and 1,200 housing unit. BGs are the smallest geographic unit for which the Census Bureau tabulates sample data. A BG usually covers a contiguous area and BGs are uniquely numbered within the census tract. Within the standard census geography hierarchy, BGs never cross state, county, or census tract boundaries but may cross the boundaries of any other geographic entity. There are little more number of Census Block Groups within Los Angeles County in 2020 Census TIGER/Line Shapefiles, compared in 2010.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">City Boundary</SPAN><SPAN>:</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>City Boundary data is the base map information for the County of Los Angeles. These City Boundaries are based on the Los Angeles County Seamless Cadastral Landbase. The Landbase is jointly maintained by the Los Angeles County Assessor and the Los Angeles County Department of Public Works (DPW). This layer represents current city boundaries within Los Angeles County. The DPW provides the most current shapefiles representing city boundaries and city annexations. True, legal boundaries are only determined on the ground by surveyors licensed in the State of California.</SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">Countywide Statistical Areas (CSA): </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>The countywide Statistical Area (CSA) was defined to provide a common geographic boundary for reporting departmental statistics for unincorporated areas and incorporated Los Angeles city to the Board of Supervisors. The CSA boundary and CSA names are established by the CIO and the LA County Enterprise GIS group worked with the Los Angeles County Board of Supervisors Unincorporated Area and Field Deputies that reflect as best as possible the general name preferences of residents and historical names of areas. This data is primarily focused on broad statistics and reporting, not mapping of communities. This data is not designed to perfectly represent communities, nor jurisdictional boundaries such as Angeles National Forest. </SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">Low and Moderate Data</SPAN><SPAN>:</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>The low- and moderate-income summary data (LMISD) based on the American Community Survey 2016-2020 5-year estimates (2020 ACS) published by U.S. Department of Housing and Urban Development HUD).</SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">Data Field</SPAN><SPAN>:</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>UniqueID: ID field (combination of 2020 census block group number, 2024 city/community and 2021 supervisorial District number)</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>CT20: 2020 Census Tract</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>CTLABEL: census tract number with two decimal places</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>CTBG20: 2020 census tract and block group number</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>BG20: 2020 census block group number</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>CITYNAME: Incorporated city name or unincorporated area</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>COMMNAME: Legal city name or unincorporated area community name</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>SUP: 2021 supervisorial district number</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>LOW: Number of persons with family income less than 50% of the Area Median Income (AMI)</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>MOD (moderate): Number of persons with family income at least 50% but less than 80% of the AMI</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>LOWMOD: Sum of LOW and MOD / number of persons with family income less than 80% of the AMI</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>LOWMODUNIV: Number of persons with the potential for being deemed LOW or MOD. Use as denominator for calculating percentage</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>LOWMOD_PCT: The percentage of persons who are of low/moderate income; calculated by LOWMOD/LOWMODUNIV times 100</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>POP_TOT: Number of people from 2020 ACS 5YR Summary File (TabID B01001)</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>PARTICIPANT: Incorporated cities and unincorporated communities participating the CDBG (Community Development Block Grant) funding.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>DIS_POP: </SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">How this data created?</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>This polygon data is created by intersecting 2020 census block group polygons, LA Country incorporated city and unincorporated community polygons and the 2021 supervisorial district polygons. The resulting polygon boundary aligned and matched with the legal city boundary whenever possible. </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">Data created: 2024 August </SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>This data is for LACDA Map Locator purpose only and may not have been prepared for or be suitable for geoprocessing analysis, and/or for legal, engineering, or surveying intents. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information.</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>The County of Los Angeles provides this data with no claim as to the completeness, usefulness, or accuracy of its content, positional or otherwise. The user hereby acknowledges that the data is subject to change and that its accuracy cannot be guaranteed. The County and its officials and employees make no warranty, express or implied, and assume no legal liability or responsibility for the ability of users to fulfill their intended purposes in accessing or using this data. The data could include technical inaccuracies and typographical errors. The data is presented "as is," without warranty of any kind, including, but not limited to, the implied warranties of merchantability, fitness for a particular purpose, or non-infringement. </SPAN></P></DIV></DIV></DIV> |
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CDC.CDC.BG20_CSA24_SD21_LOWMOD |
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["Legal City","City","Incorporated City","Unincorporated Area","Census Tract","Census Block Group","BGs","Split Block Group"] |
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en-US |
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150000000 |
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