Layers:

Layer: i15_LandUse_Mendocino2010_Southwest (0)

Name: i15_LandUse_Mendocino2010_Southwest

Display Field: WATERSOURC

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This data represents a land use survey of the southern and western portions of Mendocino County. The northern boundary of the survey area coincides with the northern boundaries of the following three Detailed Analysis Units(DAUs): Big-Noyo-Ten Mile, Forsythe and Coyote-Russian River. DAUs are the smallest study area, within a Hydrologic Region, for the analysis of water supply and use (California Water Plan Update 2013). The survey was conducted by the California Department of Water Resources, North Central Region Office staff. Land use field boundaries were digitized with ArcGIS 9.3 using 2009 U.S.D.A National Agriculture Imagery Program (NAIP) one-meter imagery as the base. Agricultural fields were delineated by following actual field boundaries instead of using the centerlines of roads to represent the field borders. Field boundaries were reviewed using 2010 NAIP and Landsat 5 imagery. Field boundaries were not drawn to represent legal parcel (ownership) boundaries, and are not meant to be used as parcel boundaries. The field work for this survey was conducted between the end of July and the beginning of October 2010. Images, land use boundaries and ESRI ArcMap software were loaded onto laptop computers that were used as the field data collection tools. Staff took these laptops into the field and virtually all agricultural fields were visited to identify the land use. Global positioning system (GPS) units connected to the laptops were used to confirm the surveyor's location with respect to the fields. Land use codes were digitized in the field using a customized data entry program developed by DWR to work with ArcMap software. ArcGIS geoprocessing tools and topology rules were used to locate errors for quality control. The primary focus of this land use survey is mapping agricultural fields. Urban residences and other urban areas were delineated using aerial photo interpretation of 2009 and 2010 NAIP imagery. Some urban areas may have been missed, especially in forested areas. Rural residential land use was delineated by drawing polygons to surround houses and other buildings along with some of the surrounding land. These footprint areas do not represent the entire footprint of urban land. Sources of irrigation water were identified for general areas and occasionally supplemented by information obtained from landowners. Water source information was not collected for each field in the survey, so the water source listed for a specific agricultural field may not be accurate. Before final processing, standard quality control procedures were performed jointly by staff at DWR’s North Central Region, and at DSIWM headquarters under the leadership of Jean Woods. Senior Land and Water Use Supervisor. After quality control procedures were completed, the data was finalized. The positional accuracy of the digital line work, which is based upon the orthorectified NAIP imagery, is approximately 6 meters. The land use attribute accuracy for agricultural fields is high, because almost every delineated field was visited by a surveyor. The accuracy is 95 percent because some errors may have occurred. Possible sources of attribute errors are: a) Human error in the identification of crop types, b) Data entry errors.

Copyright Text: Department of Water Resources, Division of Integrated Regional Water Management, North Central Region Office, Land and Water Use and Conservation Section.

Default Visibility: true

MaxRecordCount: 1000

Supported Query Formats: JSON, geoJSON, PBF

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Max Scale: 0.0

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

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YMin: 4687116.306299999
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YMax: 4866237.385499999
Spatial Reference: 102100  (3857)  LatestVCSWkid(0)



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Field 2: N/A
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  Label: P | PASTURE
  Description: N/A
  Symbol:
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  Color: [74, 148, 135, 255]
  Outline:
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• Value: G
  Label: G | GRAIN AND HAY CROP
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• Value: T
  Label: T | TRUCK NURSERY AND BERRY CROPS
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  Label: F | FIELD CROPS
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  Label: C | CITRUS AND SUBTROPICAL
  Description: N/A
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  Label: D | DECIDUOUS FRUITS AND NUTS
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  Label: V | VINEYARD
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  Label: S | SEMIAGRICULTURAL AND INCIDENTAL TO AGRICULTURE
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  Label: UC | URBAN COMMERCIAL
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• Value: UI
  Label: UI | URBAN INDUSTRIAL
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  Label: UL | URBAN LANDSCAPE
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  Label: UR | URBAN RESIDENTIAL
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  Label: NS | NOT SURVEYED
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