Parent Layer: Additional Information

Name: HOLC Rating (Nelson & Ayers)

Display Field: city

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This layer delineates areas which meets one of the 4 criteria listed in the 2021 Tree Solutions Now Act of 2021. Specifically, 1. A neighborhood that was, at any point in time, redlined or graded as “hazardous” by the Home Owners’ Loan CorporationHOLC neighborhoods graded as "hazardous" were identified using data from:Robert K. Nelson and Edward L. Ayers, accessed March 30, 2026, https://dsl.richmond.edu/panorama/redlining/

Copyright Text: MD DNR Forest Service, University of Richmond, Nelson and Ayers

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: false

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: -8544136.046265934
YMin: 4755533.14722629
XMax: -8520211.261342686
YMax: 4768906.7281835815
Spatial Reference: 102100  (3857)

Drawing Info:

Renderer:
Simple Renderer:
Symbol:
Style: esriSFSSolid
Color: [255, 0, 0, 127]
Outline:
Style: esriSLSSolid
Color: [153, 153, 153, 63]
Width: 1
Label: N/A
Description: N/A
Transparency: 0
Labeling Info:

Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false

HasZ: true

HasM: true

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• area_id ( type: esriFieldTypeDouble, alias: area_id )
• city ( type: esriFieldTypeString, alias: city, length: 254 )
• state ( type: esriFieldTypeString, alias: state, length: 254 )
• city_surve ( type: esriFieldTypeString, alias: city_surve, length: 254 )
• cat ( type: esriFieldTypeString, alias: cat, length: 254 )
• grade ( type: esriFieldTypeString, alias: grade, length: 254 )
• label ( type: esriFieldTypeString, alias: label, length: 254 )
• res ( type: esriFieldTypeString, alias: res, length: 254 )
• com ( type: esriFieldTypeString, alias: com, length: 254 )
• ind ( type: esriFieldTypeString, alias: ind, length: 254 )
• fill ( type: esriFieldTypeString, alias: fill, length: 254 )
• GISJOIN ( type: esriFieldTypeString, alias: GISJOIN, length: 254 )
• GEOID ( type: esriFieldTypeString, alias: GEOID, length: 254 )
• calc_area ( type: esriFieldTypeDouble, alias: calc_area )
• pct_tract ( type: esriFieldTypeDouble, alias: pct_tract )
• Shape_Leng ( type: esriFieldTypeDouble, alias: Shape_Leng )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• Shape.STArea() ( type: esriFieldTypeDouble, alias: Shape.STArea() )
• Shape.STLength() ( type: esriFieldTypeDouble, alias: Shape.STLength() )

Supported Operations:   Query   Query Attachments   Generate Renderer   Return Updates

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