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Service Description: The AGS Apps - Hydrologic Unit Code Watersheds of Alberta map service represents the standardized Hydrologic Unit Code (HUC) watershed framework for the province of Alberta. These watershed units provide a consistent hydrologic baseline and support province‑wide analysis, planning, and mapping workflows. This service is published in the NAD 1983 10TM AEP Forest (EPSG: 3400) projection and supports AGS applications.The HUC Watersheds of Alberta consist of four nested, hierarchically structured drainage basin feature classes: HUC 2 (coarsest level), HUC 4, HUC 6, and HUC 8 (finest level). Successively smaller hydrologic units are nested within larger units to create hierarchical watershed boundaries based on hydrologic principles such as flow direction. The alphanumeric watershed coding follows the United States Geological Survey (USGS) Hydrologic Unit Code system, adapted to reflect the pre-existing Canadian classification system, and links to the Environment Canada Water Survey of Canada coding. The watershed units are subject to periodic review and update, and further delineation beyond the HUC 8 level may be required where smaller, more refined watershed units are needed. Polygons may be represented as multipart polygons, typically where two or more polygons flow into another province or territory.Note: This map service is optimized for AGS applications and is intended to support efficient visualization and map performance. For more detailed information, please refer to the “hydrologic_unit_code_watersheds_of_alberta” map service instead of this version.Data Use LimitationsThis digital data is protected under copyright to the Government of Alberta with all rights reserved. Use by the general public is subject to the conditions outlined in the Informatics Branch License Agreement for Digital Data. Government of Alberta ministries and authorized agencies may conditionally use this data for internal business purposes, including conditional sharing with third parties (such as contractors and stakeholders) where necessary for reasonable use of the data relating to the provision of services to the Crown as represented by each ministry.
Map Name: ags_apps_hydrologic_unit_code_watersheds_of_alberta
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Description: The AGS Apps - Hydrologic Unit Code Watersheds of Alberta map service represents the standardized Hydrologic Unit Code (HUC) watershed framework for the province of Alberta. These watershed units provide a consistent hydrologic baseline and support province‑wide analysis, planning, and mapping workflows. This service is published in the NAD 1983 10TM AEP Forest (EPSG: 3400) projection and supports AGS applications.Note: This map service is optimized for AGS applications and is intended to support efficient visualization and map performance. For more detailed information, please refer to the “hydrologic_unit_code_watersheds_of_alberta” map service instead of this version.
Service Item Id: 31670735c1a44a35a8578425bb71e267
Copyright Text: Copyright Government of Alberta
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Title: ags_apps_hydrologic_unit_code_watersheds_of_alberta
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Comments: The AGS Apps - Hydrologic Unit Code Watersheds of Alberta map service represents the standardized Hydrologic Unit Code (HUC) watershed framework for the province of Alberta. These watershed units provide a consistent hydrologic baseline and support province‑wide analysis, planning, and mapping workflows. This service is published in the NAD 1983 10TM AEP Forest coordinate reference system (EPSG: 3400) and supports AGS applications.This data frame represents the Hydrologic Unit Code Watersheds of Alberta collection of feature classes, which is intended to define hydrologic units that form a standardized baseline that covers the province of Alberta. Successively smaller hydrologic units are nested within larger hydrologic units to create hierarchical watershed boundaries. These standard units are based on sound hydrologic principles (flow direction) and have been reconciled between and within the feature classes that form the dataset. Existing high-resolution watersheds or catchment polygons have been collated into larger watershed units to achieve the hierarchical, nested polygon dataset structure. This dataset is produced for the Government of Alberta and is available to the general public. Please consult the Distribution Information of this metadata for the appropriate contact to acquire this dataset. The Hydrologic Unit Code (HUC) Watersheds of Alberta represents a collection of four nested hierarchically structured drainage basin feature classes that have been created using the Hydrologic Unit Code system of classification developed by the United States Geological Survey (USGS), with accommodation to reflect the pre-existing Canadian classification system. The pour points associated with the delineation of these watersheds have also been included as a point feature class. The HUC Watersheds of Alberta consist of successively smaller hydrologic units that nest within larger hydrologic units, resulting in a hierarchical grouping of alphanumeric-coded watersheds feature classes. These nesting watersheds feature classes were created using ArcHydro Tools v.2 (Alberta Environment and Parks) and are subject to periodic review and update. There are currently individual feature classes for HUC 2 (coarsest level), HUC 4, HUC 6, and HUC 8 (finest level). These are all contained within a single feature dataset. The HUC Watersheds of Alberta co-exists with the Watersheds of Alberta (GOA) as well as a number of other non-GOA watersheds datasets, such as the Prairie Farm Rehabilitation Administration watersheds data published by Agriculture and Agri-Food Canada. The alphanumeric watershed coding follows the USGS system and also has a direct link to the Environment Canada Water Survey of Canada coding (as outlined by departmental Water Policy and Operations staff). Where possible, Water Survey of Canada regions (00XX level) were approximated by the HUC 6 level of delineation, but some exceptions will be noted. Further delineation past the HUC 8 level may be required where smaller, more refined watershed units are needed. More information on the USGS hydrologic units can be found at http://water.usgs.gov/GIS/huc.html. It should be noted that the HUC Watersheds of Alberta feature class polygons may be represented as multipart polygons (i.e., there may be only one record in the database associated with more than one polygon). Multipart polygons are typically located in the same watershed or basin where two (or more) polygons flow into another province or territory. Multipart polygons may be exploded into single-part polygons if required. The Hydrologic Unit Code Watersheds of Alberta are not visible beyond the scale of 1:13,866,973. Data Use Limitations GENERAL PUBLIC: This digital data is protected under copyright to the Government of Alberta, with all rights reserved, and is subject to the conditions outlined in the Informatics Branch License Agreement for Digital Data. Government of Alberta Ministries: GOVERNMENT OF ALBERTA AND AUTHORIZED AGENCIES: Government of Alberta Ministries and authorized agencies may conditionally use this data for internal business purposes, which includes conditional sharing of the data with other third parties (i.e., contractors, stakeholders) if necessary for reasonable use of the data relating to the provision of services to the Crown as represented by each Ministry.Note: This map service is optimized for AGS applications and is intended to support efficient visualization and map performance. For more detailed information, please refer to the “hydrologic_unit_code_watersheds_of_alberta” map service instead of this version.
Subject: The AGS Apps - Hydrologic Unit Code Watersheds of Alberta map service represents the standardized Hydrologic Unit Code (HUC) watershed framework for the province of Alberta. These watershed units provide a consistent hydrologic baseline and support province‑wide analysis, planning, and mapping workflows. This service is published in the NAD 1983 10TM AEP Forest coordinate reference system (EPSG: 3400) and supports AGS applications.
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Keywords: AGS Apps - Hydrologic Unit Code Watersheds of Alberta,ags_apps_hydrologic_unit_code_watersheds_of_alberta,hydrologic unit code,HUC,hydrologic,watershed
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