Name: Tree Canopy Cover

Display Field: VALUE

Type: Raster Layer

Geometry Type: null

Description: Methods:This lidar derivative provides information about tree (and tall shrub) cover. The 3-foot resolution raster was produced from the 2020 Quality Level 1 classified lidar point cloud, which was provided by Sanborn Map Company, Inc. Tukman Geospatial developed the canopy cover raster from the classified point cloud using the following processing steps in LasTools:Create Tiles (lastile)Height Normalize the Point Cloud (lasheight)Set points classified as buildings to 0 heightThin the remaining points, taking the highest point in a 1.5 x 1.5 foot area (lasthin)Convert the thinned point cloud to a DEM (las2dem)Assign all pixels with values >= 15 feet to 1 (tree canopy), and all others to 0 (no tree canopy)The data was developed based on a horizontal projection/datum of NAD83 (2011).Lidar was collected in early 2020, while no snow was on the ground and rivers were at or below normal levels. To postprocess the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, Sanborn Map Company, Inc., utilized a total of 25 ground control points that were used to calibrate the lidar to known ground locations established throughout the project area.An additional 125 independent accuracy checkpoints, 70 in Bare Earth and Urban landcovers (70 NVA points), 55 in Tall Grass and Brushland/Low Trees categories (55 VVA points), were used to assess the vertical accuracy of the data. These check points were not used to calibrate or post process the data.

Service Item Id: 82f8f7891b5b47228cfc4ea2f8308910

Copyright Text: San Mateo County Resource Conservation District, CAL FIRE, Sanborn Map Company, Inc., Tukman Geospatial LLC

Default Visibility: true

MaxRecordCount: 0

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 4514

Max Scale: 0

Supports Advanced Queries: false

Supports Statistics: false

Has Labels: false

Can Modify Layer: false

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: -1.3609425284487637E7
YMin: 4417738.444425778
XMax: -1.3487336614842933E7
YMax: 4513289.620218279
Spatial Reference: 102100  (3857)

Drawing Info:

N/A

Advanced Query Capabilities:

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

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeNone

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• VALUE ( type: esriFieldTypeInteger, alias: VALUE )
• COUNT ( type: esriFieldTypeDouble, alias: COUNT )

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

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