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Watershed Boundary Dataset (WBD) Current State Process for Ordering and Updating

This document provides an overview of the current state process for ordering and updating the Watershed Boundary Dataset (WBD). It includes information on NCGC WBD responsibilities, data ordering options, state updates, data formats, and more.

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Watershed Boundary Dataset (WBD) Current State Process for Ordering and Updating

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  1. Watershed Boundary Dataset (WBD)Current State Process forOrdering and Updating Laura Davenport Cartographer/National WBD Technical Support Team USDA-NRCS National Cartography and Geospatial Center (NCGC), Fort Worth, Texas

  2. Highlights: • NCGC WBD Responsibilities • Gateway Data Ordering • In-State WBD Re-Submittal Options

  3. NCGC WBD Responsibilities * Assist USGS with National Technical Review and to ensure the integrity of the certified WBD* SDE Geodatabase integration of National layers of Watershed Boundary certified data and updates submitted by in-state data stewards* Serve data online via the Geospatial Data Gateway; http://datagateway.nrcs.usda.gov* Data Storage and Archiving

  4. http://datagateway.nrcs.usda.gov

  5. WBD Data Ordering By State: order defaults to delivery by one shapefile for Area of Interest. By County: order defaults to delivery by separate individual sub-basins but can be overridden in Step 3 to one shapefile delivered by Area of Interest. Define Order Area: use a Bounding Box to define Area of Interest; defaults to delivery by separate individual sub-basins but can be overridden in Step 3 to one shapefile delivered by Area of Interest.

  6. Data is delivered for free via ftp download. Fees are assessed for deliveries on CDROM or DVD to the public and non-USDA entities.

  7. Ordering Seamless National Layers for Lower 48:

  8. Future Gateway Direction for WBD • Currently, the Gateway delivers only shapefiles. • Geodatabase deliveries will be implemented in the future. • The HUC250K layer will be retired and archived. • WBDHU8: A new “unofficial” 8 digit HUC layer at 1:24,000 scale has been created by NCGC for download to replace the HUC250K 8 digit layer.

  9. State Updates to WBD Contact In-state Data Stewards to request/suggest updates: http://www.ncgc.nrcs.usda.gov/products/datasets/watershed/coordinators.html Accepted Data Formats for Linework and Polygons: *ArcInfo Coverage (Cleaned and Built) or * ArcGIS Personal or File Based Geodatabase (Topology Rules Applied); ask NCGC for topology.rul file that includes these rules for error correction:

  10. State WBD Resubmission Whether Resubmitting the Entire State or only a Portion of the State: * Submit ALL linework with polygons after a topology check * Proper Projection Information: Geographic, NAD 83 (contactNCGC for .prj file) Data may require conversion to another projection for editing, but does need to be converted back to Geographic, NAD 83 for resubmission. * Ensure “ACRES” field is up to date and rounded to nearest whole number. * Updated metadata and associated “META_ID” fields in both polygons and linework * Conduct full coordination with border states throughout the edit process * Let NCGC know edge match plan if submitting polygons that overlap into bordering state(s); whether new polygons replace (preferred method) existing polygons in SDE version or to do a clip to state boundary and merge polygons at borders.

  11. Updates: Alternative to Downloading • In-State WBD Stewards can contact me at laura.davenport@ftw.usda.gov to obtain a “Check-Out” of their data to edit instead of downloading from the Gateway and converting to a geodatabase or an ArcInfo Coverage. • Conditions that apply to editing a check-out: * Do not edit the outer perimeter of checked-out extent * Do not change the structure of the checked-out geodatabase (naming, layer structure, etc.) * Editing would need to be done in Geographic. Add data source to ArcMap first and let WBD reproject on the fly. * Editor of the Check-Out must be using the same version of ArcGIS from which the SDE Check-Out was derived (Currently 9.2 sp5). An exact service pack match is not necessarily required. Service Pack 6 edits have also been checking in properly to a Service Pack 5 version of the SDE database, but sp5 could have issues checking in to an sp6 SDE version. **In ANY geodatabases DO NOT use True Curves in your data. This creates problems for Shapefiles for they do not have the precision to support True Curves.**

  12. What Happens to the Data once it arrives at NCGC? Ask about “WBD SDE Geodatabase Integration and Gateway Processing”

  13. Additional Questions/Comments? Contact Laura Davenport laura.davenport@ftw.usda.gov This document is available for download: ftp://ftp.ftw.nrcs.usda.gov/pub/wbd/hu_qa/WBD_GDB_FY09_StatesCurrentProcess.ppt

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