Welcome to the 2019 TUgis Conference. TUgis: Maryland’s Geospatial Conference is a cooperative undertaking of three primary partners—Maryland State Geographic Information Committee, Maryland Department of Information Technology, and Towson University. TUgis is dedicated to growing and empowering the GIS community throughout the Mid-Atlantic. The annual conference connects the Maryland GIS community to new ideas and trends and offers ample opportunities to find ways to collaborate.
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Thursday, August 8 • 1:15pm - 1:45pm
Comparing Streamline Generation Tools for Large-Scale Applications

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A time-consuming and labor-intensive task of floodplain modeling is reconciling the detailed geometry of a studied stream with its greater stream network and watershed. The hydrology and watershed of the studied reach can be adequately determined with lower-resolution DEMs, but the corresponding hydraulics and floodplain extents necessitates higher-resolution DEM data. That is, the streamline of the studied reach must match not only aerial imagery but also high-resolution lidar. As higher and higher resolution DEMs become available, the effort required to produce a high-quality streamline also becomes higher and higher. Readily available National Hydrography Dataset (NHD)+ Hi Res streamline data contains important reach connectivity information, but often fails to match the resolution of the best-available lidar. Even the best lidar typically hydro-enforces bridges, but not culverts or dams. Although hydro-connectors resolve this issue, this data is not always available, and to create them using only visual inspection is a tedious, time-consuming, and expensive task. High-quality DEMs also come at the cost of longer and more intensive computing requirements. Fortunately, there are a multitude of tools, algorithms, and GIS platforms that can reduce both human and computing cost. Newer versions of Esri's ArcMap Desktop and ArcMap Pro offer more complex flow direction algorithms in addition to faster processing speeds. GRASS (Geographic Resources Analysis Support System) and Whitebox offer similar capabilities, but do not require expensive licenses. These free, open-source softwares also include hydrology-tailored toolboxes that rival or even surpass that of the well-known Esri ArcHydro toolbox. This presentation will outline some of these tools and compare and contrast the algorithms, processing time, and output quality associated with each of them. This analysis can help floodplain modelers devise a cost-effective strategy for automating streamline generation across a variety of terrains.


Jennifer Pfister

GIS Analyst III, KCI Technologies Inc., Geospatial Solutions

avatar for John Paul Miller

John Paul Miller

Water Resources Planner, Wood
Mr. Miller is a certified hydrologist-in-training (HIT) and an expert in multiple areas of water resources science and regulatory support. His work has helped more than a dozen municipal and private clients meet permitting requirements for MS4, TMDL, SWPPP, and NPDES regulations... Read More →
avatar for Kristine Mosuela

Kristine Mosuela

Water Resources Engineer, Wood
Kristine Mosuela is a water resources engineer at Wood. She specializes in developing hydrologic and hydraulic 1D and 2D models for various floodplain studies. When she is not clicking away on HEC-RAS, she enjoys participating in her department’s “Coding Collective” group, where... Read More →

Thursday August 8, 2019 1:15pm - 1:45pm EDT
LA 4110 Liberal Arts Building - 251 University Ave. Towson, MD 21204