A Geodatabase Infrastructure for Texas

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Presentation transcript:

A Geodatabase Infrastructure for Texas Project Status Presented by: Tyler Jantzen GIS in Water Resources CE394K.3 November 29, 2005

Background Information National Hydrography Dataset High Resolution (NHDH) is being compiled for U.S. NHDH is listed as complete for the state of Texas 24 Subregions lie within Texas These 24 Subregions contain 1.8 million flowlines, and over 688,000 miles of streamlength. Ultimate Goal: To trace a drop of water from source to sink

Medium Resolution vs. High Resolution 1.38 GB High Resolution: 1: 24,000 20x number of lines 3x length of lines 7.33 GB 24 Subregions

NHD Subregions in Texas

Problem Definition Some subregions are missing data

Problem Definition Flowlines are not physically connected These are duplicates, and should be connected

Problem Definition Some flowlines are not initialized properly Uninitialized flow direction makes flow tracing impossible

Problem Definition How can the extent of the problem be quantified? Cannot “trace” from top to bottom of basin How can the extent of the problem be quantified? Trace should reach entire subregion Trace Upstream Trace Downstream

Data Requirements 24 NHD Subregion Personal Geodatabases Information at http://nhd.usgs.gov Download at ftp://nhdftp.cr.usgs.gov/NHD_HUC and ftp://nhdftp.usgs.gov/SubRegions Texas Natural Resource Information System (TNRIS)

Methodology Developed Place flag at subregion outlet Trace upstream or Find disconnected Place additional flags where trace ends Simulates “fixing” a disconnect Continue until majority of subregion is traced

Results Measure data completeness: Drainage Density DD<1 → Likely incomplete DD>1 → Likely complete

Results Using Trace Upstream function

Results Using Find Disconnected function

Conclusions If 55 fixes were made, 91% of the network would be connected 12 of the 24 regions are still missing data

Future Work Fill in missing data Create single geodatabase for entire state Measure connectivity for single large geodatabase

Recommendations With minimal fixes (55) over the entire state, a majority (91%) of the streams will be connected to the network These fixes, if made, will significantly increase the utility of the NHD

Questions?