Name: NED Elevation Contours

Display Field: PERMANENT_

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: This dataset represents variant packaging of USGS elevation data. The primary USGS elevation products are gridded elevation points; contours are derived from these data for standard contour maps, and these contour data are also published as GIS vectors. Contours are typically a means of representing elevations for human visualization on maps, and are never more accurate than the gridded elevation data they are derived from.This contour featureclass was generated from the 1/3 arc-second version of the 3D Elevation Program. The intended viewing scale for these features is 1:24,000. The contours are derived from a filtered elevation raster to achieve smoother arcs. In some areas, the 3DEP data may be modified by the National Hydrography Dataset (NHD) flow lines and water bodies to facilitate improved integration between the hypsography and hydrography on USGS map products. These contours were generated primarily for use as a layer in GeoPDFs created in the digital mapping program. The raster data source of contours is the 3D Elevation Program 1/3 arc-second layer. Secondary datasets include the high resolution flow lines, water bodies, and areas from the National Hydrography Dataset (NHD). The NHD layers are used in hydro-enforcement of the DEM prior to contour generation. The goals of the hydro-enforcement are to prevent contour lines from extending over the surface of water bodies and to align the contour reentrants with the NHD single- line streams. The 3DEP raster cells are converted to points. Those points, along with the NHD flow lines are input into an interpolation tool to create a new surface. The NHD water bodies and areas are preprocessed to attach the minimum and maximum elevation to each polygon. From these precalculated values, an appropriate value is calculated by which to raise the elevation cells under the NHD polygons. The NHD polygons are then converted into rasters, which in turn will be used to generate a mosaic that includes the new raster surface. The mosaic is filtered to provide smoother contour lines. Contours are generated and depression and index contours are identified. There is no guarantee or warranty concerning the accuracy of the data. Users should be aware that temporal changes may have occurred since these data were collected and generated and that some parts of these data may no longer represent actual surface conditions. Hydro-enforcement and generalization can also significantly alter the spatial characteristics of the contours. Users should not use these data for critical applications without a full awareness of its limitations

Copyright Text: U.S. Geological Survey, National Geospatial Program, 20220429, USGS NED 1/3 arc-second Contours for Los Angeles W, California 20220429 1 X 1 degree FileGDB 10.1: U.S. Geological Survey. Publication Date: 2022-04-29

Default Visibility: false

MaxRecordCount: 1000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 9100.0

Max Scale: 0.0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: true

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: -1.33013040870005E7
YMin: 4034236.500355349
XMax: -1.3205934417373372E7
YMax: 4151394.3898230367
Spatial Reference: 102100  (3857)  LatestVCSWkid(0)

Drawing Info:

Renderer:
Simple Renderer:
Symbol:
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Color: [115, 38, 0, 255]
Width: 1
Label: N/A
Description: N/A
Transparency: 0
Labeling Info:
Label Placement: esriServerLinePlacementCenterAlong
Label Expression: [CONTOURELE]
Use Coded Values: true
Symbol:
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Background Color: N/A
Outline Color: N/A
Vertical Alignment: bottom
Horizontal Alignment: center
Right to Left: false
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YOffset: 0
Size: 8
Font Family: Arial
Font Style: normal
Font Weight: bold
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Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false
Supports Percentile Statistics: true
Supports Having Clause: true
Supports Count Distinct: true
Supports Time Relation: true
Supports Sql Format: false
Supports Query Analytic: true
Supports Query With Current User: true

HasZ: true

HasM: true

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• PERMANENT_ ( type: esriFieldTypeString, alias: Permanent_, length: 40 )
• SOURCE_FEA ( type: esriFieldTypeString, alias: Source_Fea, length: 40 )
• SOURCE_DAT ( type: esriFieldTypeString, alias: Source_Dat, length: 40 )
• SOURCE_D_1 ( type: esriFieldTypeString, alias: Source_D_1, length: 100 )
• SOURCE_ORI ( type: esriFieldTypeString, alias: Source_Ori, length: 130 )
• DATA_SECUR ( type: esriFieldTypeInteger, alias: Data_Secur )
• DISTRIBUTI ( type: esriFieldTypeString, alias: Distributi, length: 4 )
• LOADDATE ( type: esriFieldTypeDate, alias: LoadDate, length: 8 )
• FCODE ( type: esriFieldTypeInteger, alias: FCode )
• CONTOURELE ( type: esriFieldTypeDouble, alias: ContourEle )
• CONTOURUNI ( type: esriFieldTypeInteger, alias: ContourUni )
• CONTOURINT ( type: esriFieldTypeDouble, alias: ContourInt )
• NEDRESOLUT ( type: esriFieldTypeDouble, alias: NEDResolut )
• CELL_ID ( type: esriFieldTypeInteger, alias: Cell_ID )
• SHAPE_LENG ( type: esriFieldTypeDouble, alias: Shape_Leng )
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• SHAPE ( type: esriFieldTypeGeometry, alias: Shape )
• SHAPE.LEN ( type: esriFieldTypeDouble, alias: SHAPE.LEN )

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

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