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HARPgroup / r-dh-ecohydro

A set of R scripts for generating Ecological Limit Functions (ELF), storing the modeled output with REST in drupal VAHydro (dH), and a set of scripts for querying and analyzing processed ELF data
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EROM data needing fixing #86

Open rburghol opened 6 years ago

rburghol commented 6 years ago

Some points had bad matches with EROM (or old version of NHD or EROM had bad intersection), or EROM was screwy due to bad connectivity.

Example:

image

image

jenniferRapp commented 6 years ago

Rob, what does bad connectivity mean? I take a look at my data layer that I did to join the points to the stream and see what my joined EROM dataset would have had for the flow there. I don't see an NHDPlus stream anywhere in the map view, so I wonder how far away that point had to be associated with the nearest stream. Are you planning to investigate all the HUC10 points that may have these anomalies?

Jennifer Lynn Rapp, Biogeographer and GIS Specialist jrapp@usgs.gov U.S. Geological Survey Virginia and West Virginia Water Science Center 1730 East Parham Road Richmond, VA 23228 w. 804-261-2635

On Fri, Aug 3, 2018 at 2:32 PM, rburghol notifications@github.com wrote:

Some points had bad matches with EROM (or old version of NHD or EROM had bad intersection), or EROM was screwy due to bad connectivity.

Example:

  • Fish Site: DGIF302138
  • NHDplus COMID: 8525447
  • Mean Annual; 1.54 cfs
  • Issue: from map, HUC look like it has considerable upstream drainage so should have higher Q, and fish site has NT = 22, so that suggests higher flow site as well.

[image: image] https://user-images.githubusercontent.com/4571170/43659319-a48a6fc0-9729-11e8-8617-3f91baf85b35.png

[image: image] https://user-images.githubusercontent.com/4571170/43659440-0a732c8c-972a-11e8-8f7c-3e2e77af330e.png

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rburghol commented 6 years ago

"Bad connectivity" refers to the linkage upstream for the NHDplus watershed segment. Based on the EROM data that we have for this location, the stream shows an area of about 1.0 square mile, and then the EROM flow which is 1.54. But, looking at the topographic map here, this segment of NHDplus receives flow from upstream segments, but it is not represented as such in our version of EROM.

We associated the monitoring points via containment on the NHDplus catchments layers -- interested to see what drainage area and flow does your version of EROM show for this watershed/comid? (maybe we have an error in our version?).

As for QA'ing, this is me implementing the process that will be used as we move forward at DEQ. i.e., you identify a location, look at available data, QA if need be, and do analysis. We have done this all along at the HUC8 and HUC6 level (but not as much as we would have liked of course), but this is the first time (to my knowledge) that we are doing at the HUC10.

jenniferRapp commented 6 years ago

All these characterizations match with the NHD spatial joins I conducted. The DA was 1.687 square miles and the MAF was 1.54. It looks like it snapped to the correct stream reach, given the location on the landscape and the proximity to the streams. The only thing I can guess is that for some reason the data don't fit with the nhd stream characterizations is if the LAt long were slightly off. There are numerous VDGIF sample sites on the mainstem just north of the sample in question. If this site had a lat of 37.51 it would be plotting on Craig Creek with 250 square miles DA, not the small 2nd order trib. Do you all have attribute data from VDGIF that states the stream the data were collected on? It may be in EDAS.

Jen

Jennifer Lynn Rapp, Biogeographer and GIS Specialist jrapp@usgs.gov U.S. Geological Survey Virginia and West Virginia Water Science Center 1730 East Parham Road Richmond, VA 23228 w. 804-261-2635

On Fri, Aug 3, 2018 at 2:32 PM, rburghol notifications@github.com wrote:

Some points had bad matches with EROM (or old version of NHD or EROM had bad intersection), or EROM was screwy due to bad connectivity.

Example:

  • Fish Site: DGIF302138
  • NHDplus COMID: 8525447
  • Mean Annual; 1.54 cfs
  • Issue: from map, HUC look like it has considerable upstream drainage so should have higher Q, and fish site has NT = 22, so that suggests higher flow site as well.

[image: image] https://user-images.githubusercontent.com/4571170/43659319-a48a6fc0-9729-11e8-8617-3f91baf85b35.png

[image: image] https://user-images.githubusercontent.com/4571170/43659440-0a732c8c-972a-11e8-8f7c-3e2e77af330e.png

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/HARPgroup/r-dh-ecohydro/issues/86, or mute the thread https://github.com/notifications/unsubscribe-auth/AgIeBUVicm53MOPlGO2LySDROPZAgSFcks5uNJc8gaJpZM4Vubyw .

rburghol commented 6 years ago

Good idea on EDAS - I will check that. What I am actually thinking is that the NHDplus looks erroneous here, as I think it's missing an upstream trib -- but an error in the DGIF lat/lon is certainly a good possibility. I will report back if I learn anything.

rburghol commented 6 years ago

Alas. Stream name not indicated in EDAS for this record.

jenniferRapp commented 6 years ago

bummer. We could ask VDGIF.

Jen

Jennifer Lynn Rapp, Biogeographer and GIS Specialist jrapp@usgs.gov U.S. Geological Survey Virginia and West Virginia Water Science Center 1730 East Parham Road Richmond, VA 23228 w. 804-261-2635

On Mon, Aug 6, 2018 at 11:45 AM, rburghol notifications@github.com wrote:

Alas. Stream name not indicated in EDAS for this record.

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