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Service Description: The West Coast Region leverages the National Hydrography Dataset as a base dataset for managing marine and anadromous species. The NHD will be updated over time by downloading new versions from the USGS and publishing it as a new base dataset. The symbology within this map service is broken down by stream order. Stream order (calculated in the NHD using Strahler Stream Order (Strahler, A.N., 1952; Horton, R.E., 1945)) in hydrography deals with the hierarchy of streams from the source (or headwaters) downstream. The headwaters are the first order and downstream segments are defined at confluences (two streams running into each other). At a confluence, if the two streams are not the same order then the highest numbered order is maintained on the downstream segment. At a confluence of two streams with the same order, the downstream segment gets the next highest numbered order. Divergences such as braided streams actually maintain the same order all the way through the braid, just like it was a single stream; however, divergences that are not braided streams keep the upstream order number and follow the normal hierarchy further downstream. Horton, R. E. (1945), "Erosional development of streams and their drainage basins: hydro-physical approach to quantitative morphology", Geological Society of America Bulletin 56 (3): 275–370. Strahler, A. N. (1952), "Hypsometric (area-altitude) analysis of erosional topology", Geological Society of America Bulletin 63 (11): 1117–1142. https://usgs-mrs.cr.usgs.gov/NHDHelp/WebHelp/NHD_Help/Introduction_to_the_NHD/Feature_Attribution/Stream_Order.htm
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Copyright Text: USGS
Spatial Reference:
4269
(4269)
Single Fused Map Cache: false
Initial Extent:
XMin: -125.28240701006844
YMin: 38.6936118123577
XMax: -109.37428631142267
YMax: 49.81038307997146
Spatial Reference: 4269
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Full Extent:
XMin: -124.72442391684274
YMin: 32.51016838640893
XMax: -109.7705582067208
YMax: 49.039371405131135
Spatial Reference: 4269
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Units: esriDecimalDegrees
Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP
Document Info:
Title: NHD2012
Author: Shanna Dunn, GIS Analyst, Protected Resources Division
Comments: The West Coast Region leverages the National Hydrography Dataset as a base dataset for managing marine and anadromous species. The NHD will be updated over time by downloading new versions from the USGS and publishing it as a new base dataset. The symbology within this map service is broken down by stream order. Stream order (calculated in the NHD using Strahler Stream Order (Strahler, A.N., 1952; Horton, R.E., 1945)) in hydrography deals with the hierarchy of streams from the source (or headwaters) downstream. The headwaters are the first order and downstream segments are defined at confluences (two streams running into each other). At a confluence, if the two streams are not the same order then the highest numbered order is maintained on the downstream segment. At a confluence of two streams with the same order, the downstream segment gets the next highest numbered order. Divergences such as braided streams actually maintain the same order all the way through the braid, just like it was a single stream; however, divergences that are not braided streams keep the upstream order number and follow the normal hierarchy further downstream. Horton, R. E. (1945), "Erosional development of streams and their drainage basins: hydro-physical approach to quantitative morphology", Geological Society of America Bulletin 56 (3): 275–370. Strahler, A. N. (1952), "Hypsometric (area-altitude) analysis of erosional topology", Geological Society of America Bulletin 63 (11): 1117–1142. https://usgs-mrs.cr.usgs.gov/NHDHelp/WebHelp/NHD_Help/Introduction_to_the_NHD/Feature_Attribution/Stream_Order.htm
Subject: This National Hydrography Dataset (NHD) was downloaded from the United States Geological Survey site in July 2012.
Category:
Keywords: National Hydrograhpy Dataset,NHD,rivers,streams,creeks,flowline,waterbody,stream order,Strahler
AntialiasingMode: None
TextAntialiasingMode: Force
Supports Dynamic Layers: true
MaxRecordCount: 1000
MaxImageHeight: 4096
MaxImageWidth: 4096
Supported Query Formats: JSON, AMF, geoJSON
Min Scale: 0
Max Scale: 0
Supports Datum Transformation: true
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