View In:
ArcGIS JavaScript
ArcGIS Online Map Viewer
ArcGIS Earth
ArcMap
ArcGIS Pro
View Footprint In:
ArcGIS Online Map Viewer
Service Description: This layer is HUC12s for all NHD regions that contact CA, or are upstream catchments of regions touching CA with downstream connectivity information.
It has been run through a tool that validated the HU_12_DS attribute based on a series of rules, and then the attribute was corrected for those that were wrong. So far, only the California HUC12s have been corrected. This layer also underwent further nonstandard modifications that make it somewhat incompatible with other HUC12 layers.
This layer was derived from the CWS Western_US_HUCs layer and developed to be the consistent HUC12 layer in use at the UC Davis Center for Watershed Sciences. In additiion to making a few corrections to the HU_12_DS fields, we chopped off the coastal buffer on the HUC12s using the following methods:
1)We had an old copy of the HUC12s without the coastal buffer (~January 2011).
2)Select all HUCs in this layer with HU_12_DS of Ocean.
3)Intersect the layer with the older layer, generating split coastal HUC12s.Select all polygons that are offshore. Change ID so that the first digit is now an M (instead of a 1. Stands for modified. "O" for ocean was considered, but looked too much like a zero)
5) remove the Ocean flowing HUCs from the original layer
6) Merge in the new split HUCs
Map Name: Layers
Legend
All Layers and Tables
Dynamic Legend
Dynamic All Layers
Layers:
Description:
Copyright Text: Nick Santos, UC Davis Center for Watershed Sciences
Spatial Reference:
3310
(3310)
Single Fused Map Cache: false
Initial Extent:
XMin: -619244.8229840853
YMin: -127106.38340289018
XMax: 843113.6924107835
YMax: 509217.1868094717
Spatial Reference: 3310
(3310)
Full Extent:
XMin: -384564.4894999992
YMin: -644920.2279000003
XMax: 566275.2755999985
YMax: 592275.7969999991
Spatial Reference: 3310
(3310)
Units: esriMeters
Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP
Document Info:
Title: Hydrologic Units With Downstream Connectivity
Author: Nick Santos, UC Davis Center for Watershed Sciences
Comments: This layer is HUC12s for all NHD regions that contact CA, or are upstream catchments of regions touching CA with downstream connectivity information.
It has been run through a tool that validated the HU_12_DS attribute based on a series of rules, and then the attribute was corrected for those that were wrong. So far, only the California HUC12s have been corrected. This layer also underwent further nonstandard modifications that make it somewhat incompatible with other HUC12 layers.
This layer was derived from the CWS Western_US_HUCs layer and developed to be the consistent HUC12 layer in use at the UC Davis Center for Watershed Sciences. In additiion to making a few corrections to the HU_12_DS fields, we chopped off the coastal buffer on the HUC12s using the following methods:
1)We had an old copy of the HUC12s without the coastal buffer (~January 2011).
2)Select all HUCs in this layer with HU_12_DS of Ocean.
3)Intersect the layer with the older layer, generating split coastal HUC12s.Select all polygons that are offshore. Change ID so that the first digit is now an M (instead of a 1. Stands for modified. "O" for ocean was considered, but looked too much like a zero)
5) remove the Ocean flowing HUCs from the original layer
6) Merge in the new split HUCs.
Subject: This layer is HUC12s for all NHD regions that contact CA, or are upstream catchments of regions touching CA with downstream connectivity information.
Category:
Keywords: HUC12,HUCs,HUC,Hydrologic Unit Codes,California
AntialiasingMode: None
TextAntialiasingMode: Force
Supports Dynamic Layers: true
MaxRecordCount: 1000
MaxImageHeight: 4096
MaxImageWidth: 4096
Supported Query Formats: JSON, geoJSON
Supports Query Data Elements:
Min Scale: 0
Max Scale: 0
Supports Datum Transformation: true
Child Resources:
Info
Dynamic Layer
Supported Operations:
Export Map
Identify
QueryDomains
QueryLegends
Find
Return Updates
Generate KML