Service Description: This dataset was developed as part of an Urban Tree Canopy (UTC) assessment for Providence, Rhode Island. It shows how tree canopy changed during the period 2011-2018, highlighting trees that were gained or lost during the period. It is intended for use in monitoring patterns of change in Providence, Rhode Island tree canopy.
Service ItemId: d54bb685c76246789407bf6944a6e3d6
Has Versioned Data: false
Max Record Count: 2000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: True
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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.
Spatial Reference: 32619 (32619)
Initial Extent:
XMin: 295680.464621638
YMin: 4634263.67023247
XMax: 296834.273932832
YMax: 4635215.80396072
Spatial Reference: 32619 (32619)
Full Extent:
XMin: 294691.911
YMin: 4627334.6116
XMax: 302687.3597
YMax: 4637304.1094
Spatial Reference: 32619 (32619)
Units: esriMeters
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