[Fit-elevation] USGS 3DEP requirement for breaklines and NHD

[EDWARDS Jacob * DGMI]

Hello,

Below is a link to a doodle poll for a meeting to discuss Oregon NHD updates via 3DEP lidar projects. The goals of the meeting are:


*         Understand the current workflow for updating NHD in Oregon - who is doing what

*         Review new 3DEP optional requirements for NHD updates - what does USGS require and does that meet NHD needs

*         Discuss optional workflows to incorporate NHD delineation and attribution as part of OLC 3DEP projects

Please feel free to send the link to the doodle poll to anyone you feel should be in attendance.

https://doodle.com/poll/c36gc2qvn25mq9sd

Thank you and have a good day.

Jacob Edwards
Oregon Lidar Consortium Coordinator
Oregon Department of Geology and Mineral Industries
800 NE Oregon Street, Suite 965, Portland, Oregon 97232
Direct: (971) 865-1073
Jacob.edwards at oregon.gov<mailto:Jacob.edwards at oregon.gov>




From: EDWARDS Jacob * DGMI
Sent: Monday, April 30, 2018 10:15 AM
To: ANTHONY Lowell * DGMI <Lowell.ANTHONY at oregon.gov<mailto:Lowell.ANTHONY at oregon.gov>>; ROBERTS Jed * DGMI <Jed.ROBERTS at oregon.gov<mailto:Jed.ROBERTS at oregon.gov>>; WILLIAMS Matt * DGMI <Matt.WILLIAMS at oregon.gov<mailto:Matt.WILLIAMS at oregon.gov>>; Bob Harmon <robert.c.harmon at state.or.us<mailto:robert.c.harmon at state.or.us>>
Cc: HAIRSTON-PORTER Robert * DGMI <Robert.HAIRSTON-PORTER at oregon.gov<mailto:Robert.HAIRSTON-PORTER at oregon.gov>>; ELEVATION FIT LISTSERV (fit-elevation at listsmart.osl.state.or.us<mailto:fit-elevation at listsmart.osl.state.or.us>) <fit-elevation at listsmart.osl.state.or.us<mailto:fit-elevation at listsmart.osl.state.or.us>>
Subject: USGS 3DEP requirement for breaklines and NHD

Hello,

The new version of Lidar Base Specification version 1.3  - https://pubs.usgs.gov/tm/11b4/pdf/tm11-B4.pdf has made some significant changes to the process of producing hydro-flattened Bare Earth rasters. Starting on page 16 of the document, USGS has outlined how it would like the 3D breaklines, which are used to create the hydro-flattened DEM, to be properly attributed for inclusion in the NHD.  This appears to be a significant step towards streamlining NHD updated via lidar. I have emailed you because you have worked on NHD updates and I want to solicit your thoughts on this update.

Currently DOGAMI is still planning on paying QSI to create hydro-breaklines and produce hydro-flattened DEMs. However, this might be an opportunity to involve State NHD champions in the production of breakline data. Currently DOGAMI has two planned 3DEP collections this year that may or may/not have to meet this new requirement. Therefore I want to open up the discussion on what the state's response should be to the recent changes to the USGS 3DEP project. What I basically want to know, is if you think that we should continue to rely on QSI to produce breakline or should adjust the process to involve hydrologic professional in the creation of the breaklines which will be used to update the NHD.

Feel free to share this email with other folks that you feel should be involved in the discussion.

Thank you,

Jacob Edwards
Oregon Lidar Consortium Coordinator
Oregon Department of Geology and Mineral Industries
800 NE Oregon Street, Suite 965, Portland, Oregon 97232
Direct: (971) 865-1073
Jacob.edwards at oregon.gov<mailto:Jacob.edwards at oregon.gov>

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