Questions tagged [nhd]
For questions about the National Hydrology Dataset (NHD) by the US Geological Survey (USGS)
22
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Clipping large National datasets to large river basins, or merging many smaller geodatabases/tiles in ArcGIS Pro
My question is more about finding the most efficient way to process large national datasets. I am trying to summarize land-use change, agriculture crop area,soils,and hydrological and streamflow ...
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NHD HR Dataset looks corrupt when I query intermittent and ephemeral streams
I am trying to create a dataset for dry stream observations using NHD HR Dataset. But when I select only the streams with Feature Code "Intermittent" or "Ephemeral" it returns a ...
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Missing results when using the Identify Tool in QGIS
This is my first time using QGIS and I am working on the NHD Plus HR shapefile for the Connecticut River watershed.
Within this, I am trying to use the identity tool to identify the NHDPlusID ...
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Stream order data for Canadian streams
I am researching streams and I want to select 1st-3rd order streams in North America. The NHD Plus V2 Flowline Network contains stream order (Strahler) in the packaged data and I was wondering if ...
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How to download NHDFlowline data for the Lower Colorado (area 15)
https://www.epa.gov/water-data-and-tools/nhdplus-lower-colorado-data-vector-processing-unit-15 doesn't seem to have a download link.
Maybe https://nhdplus.com/NHDPlus/NHDPlusV2_15.php has them but ...
- 205
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Include dam in DEM based stream burning
I am about to include many dams inside a watershed into the stream burning process.
The raw input is NHDPlus flowline with the stream order information (VAA). Because NHD has too many flowline, we ...
- 290
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1
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Extending points upstream to create stream reach using ArcGIS Pro
I'm a PhD student tasked with analyzing a very large set of fisheries surveys conducted within discrete stream reaches. Unfortunately, the only information provided on location of each reach is (a) ...
3
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66
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Working with the FlowDir in the national hydography dataset
In the National Hydrography Dataset there's a FlowDir field.
According to https://www.townofnewipswich.org/sites/g/files/vyhlif4766/f/uploads/dataset_dictionary.pdf the two possible values for FlowDir ...
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3
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138
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Tracing Upstream Accumulation from a polygon start
I am new to ESRI products (I typically use QGIS), but am using it in order to analyze upstream/downstream flowlines with the National Hydrography Dataset (specifically, HUC-4 mapping units for NHDPLUS ...
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NHD Utilities (National Hydrography Dataset) for newer versions of ArcGIS
Applied GIS ArcGIS utility question here that maybe somebody stumbles across. I am using the United States Geological Survey National Hydrography Dataset dataset - rivers, lakes, flow directions, ...
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Accessing watershed boundary for lakes in R
I have had success accessing unique database IDs and polygons for various lakes in the US. I'm now looking to get polygons for the watersheds associated with these lakes, but have stumbled a bit.
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56
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Using Spatial Join to join geologic features to polylines
I want to spatially join polygons (geologic features, major aquifers) to where the NHD polylines (rivers/streams) fall. I want to be able to click on a polyline and see what geologic feature or major ...
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35
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Remeasuring portion of NHD route system?
How do I remeasure a portion of the NHD route system? So that it measures continuous through each confluence, that is, if 0 station is at the first confluence then when we reach the next confluence it ...
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2
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206
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Unable to create geometric network on NHDFlowline - invalid enabled field type
I need to create a geometric network in order to perform a downstream trace on a NHDFlowline data in my ArcGIS.
I have two flowline layers on one of them I am able to create a geometric network and ...
- 121
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1
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357
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NHD layers won't redraw in ArcGIS 10.1 at small scale?
If I am already zoomed in to a smaller scale and then add the NHD Hydrography dataset (already clipped to just Texas), I can see all the NHDFlowlines, NHDAreas, and other layers that come in the ...
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3
votes
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Calculate line distances inside of polygons using ArcGIS for Desktop?
I'm working with two data sets:
NHD polyline stream layer for my entire state
HUC Watershed boundary Polygons for the entire state
I am looking for a way to calculate the total length of streams ...
- 137
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1:250 streams data - USA wide - where can I find it?
I have 1:250 streams data for a few western states. I find this scale to be excellent in many settings as base hydro data.
I have never been able to find a USA or better yet, NA wide dataset of this ...
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Using QGIS with National Hydrography Dataset (NHD)? [closed]
I'm a trying to learn QGIS. I am trying to download and open with QGIS 2.0.1 state-specific data from the USGS NHD Viewer, and i think i have at least managed to do the downloading correctly. For ...
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2
answers
205
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How to begin creating a linear referenced gdb with NHD
Our legacy fish distribution data contains data by reaches. Reaches are arbitrary locations on streams, eg. reach 1, 2, 3. Each reach's from-to are known, but not by x,y coords. An example is 'brown ...
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create table with IDs for all arcs downstream of all others
I need to summarize downstream information associated with each arc in an NHD dataset. I have a table with the downstream ID for stream segment but am not sure how to get all of the downstream IDs. ...
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494
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Does the National Hydrology Dataset geodatabase work in qgis? [duplicate]
I am running QGIS 1.8 on a windows xp pc and trying to put the USGS National Hydrology Dataset (more info herefor Oregon into a project. I try to "add vector data", using directory option then ...
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How to get partial polyline from stream trace?
I am creating SOE to do stream trace. That works fine. The geometric network only have NHD flowline. The problem is that tracing result return whole flow line. I am wondering if the result only return ...
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