Questions tagged [nhd]

National Hydrology Dataset

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7
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0answers
206 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. ...
0
votes
0answers
15 views

Select paths downstream from multiple points in ArcMap

I have two datasets - (1) a stream network (National Hydrography Dataset) and (2) a rail network. I want to create a dataset of all streams that are downstream a given distance from the intersection ...
0
votes
1answer
29 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
32 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
148 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
292 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
16k 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
708 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
164 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
422 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
108 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 ...