Questions tagged [nhd]
National Hydrology Dataset
16
questions
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0answers
11 views
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 ...
0
votes
0answers
11 views
How to identify start flags in trace geometric network resultst?
I am using the Trace Geometric Network Tool (10.5.1) in conjunction with the HEM tool from USGS in order to import an existing point layer as my "flags". This works really well to save time ...
0
votes
3answers
54 views
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 ...
1
vote
1answer
30 views
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, ...
8
votes
0answers
273 views
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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0
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1answer
42 views
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 ...
1
vote
0answers
34 views
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 ...
1
vote
2answers
185 views
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 ...
0
votes
1answer
325 views
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 ...
3
votes
2answers
18k views
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 ...
0
votes
1answer
53 views
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 ...
5
votes
2answers
862 views
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 ...
2
votes
2answers
178 views
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 ...
1
vote
0answers
48 views
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. ...
2
votes
1answer
463 views
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 ...
1
vote
0answers
109 views
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 ...
