Services Directory - Draft_Vegmap(MapServer)

Draft_Vegmap (Map Service)

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Current Version: 10.81

Service Description:

The Sonoma County fine scale vegetation and habitat map is an 82-class vegetation map of Sonoma County with 212,391 polygons. The fine scale vegetation and habitat map represents the state of the landscape in 2013 and adheres to the National Vegetation Classification System (NVC). The map was designed to be used at scales of 1:5,000 and smaller.

The full datasheet for this product is available here: https://sonomaopenspace.egnyte.com/dl/qOm3JEb3tD
The final report for the fine scale vegetation map, containing methods and an accuracy assessment, is available here: https://sonomaopenspace.egnyte.com/dl/1SWyCSirE9
Class definitions, as well as a dichotomous key for the map classes, can be found in the Sonoma Vegetation and Habitat Map Key (https://sonomaopenspace.egnyte.com/dl/xObbaG6lF8)

The fine scale vegetation and habitat map was created using semi-automated methods that include field work, computer-based machine learning, and manual aerial photo interpretation. The vegetation and habitat map was developed by first creating a lifeform map, an 18-class map that served as a foundation for the fine-scale map. The lifeform map was created using “expert systems” rulesets in Trimble Ecognition. These rulesets combine automated image segmentation (stand delineation) with object based image classification techniques. In contrast with machine learning approaches, expert systems rulesets are developed heuristically based on the knowledge of experienced image analysts. Key data sets used in the expert systems rulesets for lifeform included: orthophotography (’11 and ’13), the LiDAR derived Canopy Height Model (CHM), and other LiDAR derived landscape metrics.

After it was produced using Ecognition, the preliminary lifeform map product was manually edited by photo interpreters. Manual editing corrected errors where the automated methods produced incorrect results. Edits were made to correct two types of errors: 1) unsatisfactory polygon (stand) delineations and 2) incorrect polygon labels.

The mapping team used the lifeform map as the foundation for the finer scale and more floristically detailed Fine Scale Vegetation and Habitat map. For example, a single polygon mapped in the lifeform map as forest might be divided into four polygons in the in the fine scale map including redwood forest, Douglas-fir forest, Oregon white oak forest, and bay forest.

The fine scale vegetation and habitat map was developed using a semi-automated approach. The approach combines Ecognition segmentation, extensive field data collection, machine learning, manual editing, and expert review. Ecognition segmentation results in a refinement of the lifeform polygons. Field data collection results in a large number of training polygons labeled with their field-validated map class. Machine learning relies on the field collected data as training data and a stack of GIS datasets as predictor variables. The resulting model is used to create automated fine-scale labels countywide. Machine learning algorithms for this project included both Random Forests and Support Vector Machines (SVMs). Machine learning is followed by extensive manual editing, which is used to 1) edit segment (polygon) labels when they are incorrect and 2) edit segment (polygon) shape when necessary.

The map classes in the fine scale vegetation and habitat map generally correspond to the alliance level of the National Vegetation Classification, but some map classes - especially riparian vegetation and herbaceous types - correspond to higher levels of the hierarchy (such as group or macrogroup).

Map Name: Layers

Legend

All Layers and Tables

Layers:

SonomaVegMap_5_1_Delivered(0)

Tables:

Description:

The full datasheet for this product is available here: https://sonomaopenspace.egnyte.com/dl/qOm3JEb3tD
The final report for the fine scale vegetation map, containing methods and an accuracy assessment, is available here: https://sonomaopenspace.egnyte.com/dl/1SWyCSirE9
Class definitions, as well as a dichotomous key for the map classes, can be found in the Sonoma Vegetation and Habitat Map Key (https://sonomaopenspace.egnyte.com/dl/xObbaG6lF8)

Copyright Text: Sonoma County Vegetation Mapping and LiDAR Program

Spatial Reference:
102100

Single Fused Map Cache: true

Capabilities: Map,TilesOnly

Tile Info:

Height: 256
Width: 256
DPI: 96
Levels of Detail: (# Levels: 20)

Level ID: 0 [Start Tile, End Tile]
Level ID: 1 [Start Tile, End Tile]
Level ID: 2 [Start Tile, End Tile]
Level ID: 3 [Start Tile, End Tile]
Level ID: 4 [Start Tile, End Tile]
Level ID: 5 [Start Tile, End Tile]
Level ID: 6 [Start Tile, End Tile]
Level ID: 7 [Start Tile, End Tile]
Level ID: 8 [Start Tile, End Tile]
Level ID: 9 [Start Tile, End Tile]
Level ID: 10 [Start Tile, End Tile]
Level ID: 11 [Start Tile, End Tile]
Level ID: 12 [Start Tile, End Tile]
Level ID: 13 [Start Tile, End Tile]
Level ID: 14 [Start Tile, End Tile]
Level ID: 15 [Start Tile, End Tile]
Level ID: 16 [Start Tile, End Tile]
Level ID: 17 [Start Tile, End Tile]
Level ID: 18 [Start Tile, End Tile]
Level ID: 19 [Start Tile, End Tile]

Format: PNG
Compression Quality: 0
Origin:
Spatial Reference:
102100

Initial Extent:

Full Extent:

Min Scale: 5.91657527591555E8
Max Scale: 4513.988705

Min LOD: 0
Max LOD: 17

Units: esriMeters

Supported Image Format Types: PNG

Export Tiles Allowed: true
Max Export Tiles Count: 100000

Document Info:

Title: Sonoma County Vegetation and Habitat Map (Tile Service)
Author: mtukman_osd
Comments:
Subject: Sonoma County Vegetatation and Habitat Map (v. 5/1/17)
Category:
Keywords: Vegetation, Sonoma county, veg map, habitat, sonoma, vector tile