Name: Existing Trees

Display Field: Class_name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This layer is a high-resolution tree canopy change-detection layer for Providence, Rhode Island representing change in the period 2011 to 2018, and classified in three categories: (1) No Change; (2) Gain; and (3) Loss. It was created by extracting tree canopy from existing high-resolution land-cover maps for 2011 and 2018 and then comparing the mapped trees directly. Tree canopy that existed during both time periods was assigned to the No Change category while trees removed by development, storms, or disease were assigned to the Loss class. Trees planted during the interval were assigned to the Gain category, as were the edges of existing trees that expanded noticeably. Direct comparison was possible because both the 2011 and 2018 maps were created using object-based image analysis (OBIA) and included similar source datasets (LiDAR-derived surface models, multispectral imagery, and thematic GIS inputs). OBIA systems work by grouping pixels into meaningful objects based on their spectral and spatial properties, while taking into account boundaries imposed by existing vector datasets. Within the OBIA environment a rule-based expert system was designed to effectively mimic the process of manual image analysis by incorporating the elements of image interpretation (color/tone, texture, pattern, location, size, and shape) into the classification process. A series of morphological procedures were employed to insure that the end product is both accurate and cartographically pleasing. No accuracy assessment was conducted, but the dataset will be subjected to manual review and correction.

Copyright Text: University of Vermont Spatial Analysis Laboratory in collaboration with the City of Providence and NASA, in partnership with American Forests.

Min. Scale: 0

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

XMin: -7947329.44447035
YMin: 5134692.96817621
XMax: -7946307.01376835
YMax: 5135719.22306203
Spatial Reference: 102100 (3857)

Drawing Info:

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Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID

Unique ID Field:

Name : OBJECTID

IsSystemMaintained : True

Global ID Field:

Type ID Field:

Fields:

• OBJECTID (type: esriFieldTypeOID, alias: OBJECTID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
• Class_name (type: esriFieldTypeString, alias: Class_name, SQL Type: sqlTypeOther, length: 254, nullable: true, editable: true)
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• Shape__Length (type: esriFieldTypeDouble, alias: Shape__Length, SQL Type: sqlTypeDouble, nullable: true, editable: false)

Templates:

Name: Existing Trees
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 5/3/2026 10:32:30 PM

Schema Last Edit Date: 5/3/2026 10:32:30 PM

Data Last Edit Date: 5/3/2026 10:32:30 PM

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