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Layer: Black Population (ID: 2)

Name: Black Population

Display Field: NAMELSAD

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The 2022 Census TIGER boundary files for Maryland census block groups are imported into a file geodatabase, projected to Maryland State Plane HARN (NAD 83/91) US survey feet, and then joined to the City's standard 2018-2022 American Community Survey (ACS) 5-year core extract. The joined version is then exported to a separate feature class, retaining both the TIGER fields and the ACS fields.For census block groups that are wholly or partially within the City of Gaithersburg, additional fields are provided that tabulate the proportion of households, population, and dwelling units within each block groups that are attributable to areas within the City limits. These fields are based on the 2020 Decennial Census PL 94-171 Redistricting Summary File (for both total block group and City-only numbers), the City's January and July 2020 Dwelling Units and Population Reports (for City-only numbers), and the City's January and July 2020 households_population_jobs feature classes and SDAT information for areas beyond those FCs but within the Census block group (for total dwelling units based on parcels). An additional "override housing units" field is also provided, which gives the best "true" estimate of the proportion of census block groups housing units that are within the City, by (1) using the City's July 2020 households_population_jobs feature class (parcel-based) and SDAT-based parcel information for all areas of the census block group; (2) calculating 1.0 for all block groups that are entirely within the City, regardless of Decennial Census information; and (3) using 0.0 for all block groups that contain no dwelling units within the City, regardless of Decennial Census information.For additional information about the source TIGER files from the Census, please consult this web link: https://www.census.gov/geographies/mapping-files/time-series/geo/tiger-geodatabase-file.htmlFor additional information about the ACS extract, including a brief description of each included field, please consult the metadata for the Extract table and the source Excel table. Additional information about the ACS program can be found at: https://www.census.gov/programs-surveys/acs/ Additional information about definitions used by the Census in the ACS can be found at: https://www2.census.gov/programs-surveys/acs/tech_docs/subject_definitions/2022_ACSSubjectDefinitions.pdf?#

Copyright Text: U.S. Census Bureau, City of Gaithersburg.

Default Visibility: false

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0

Max Scale: 0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: true

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:
Drawing Info: Advanced Query Capabilities:
HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:
Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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