| Section 1 | Overview | |||
| Originator | Iowa State University | |||
| Title | Stream Power Index (SPI) | |||
| Abstract | High-resolution LiDAR-derived topographic data are processed with custom algorithms (Gelder, 2017) to generate a hydrologically-enforced 2 m digital elevation model (DEM) of each HUC 12 level minor watershed. These algorithms result in hydrologically accurate elevation models by removing major impediments to flow such as roads and railroads but maintaining natural depressions such as prairie potholes and sinkholes. Processing settings maintain all depressions deeper than 9 cm (0.5 × root mean square error [RMSE]) or larger than 100 m2, thus maintaining most structural conservation practices such as terraces and water and sediment control basins. SPI is then calculated as SPI = ln(FA * tan(S)) where “FA”= Flow Accumulation and “S”=Slope in radians. | |||
| Purpose | ||||
| Time Period of Content Date | 2018 | |||
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| Spatial Extent of Data | ||||
| Bounding Coordinates | -97.379297 -89.465155 49.331444 43.264236 | |||
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| Contact Person Information | Brian Gelder,
Iowa State University 3354 Elings Hall Ames, IA 50011 Phone: Email: bkgelder@iastate.edu | |||
| Browse Graphic | None available | |||
| Associated Data Sets | ||||
| Section 2 | Data Quality | |||
| Attribute Accuracy | ||||
| Logical Consistency | ||||
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| Horizontal Positional Accuracy | ||||
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| Section 3 | Spatial Data Organization (not used in this metadata) | |||
| Section 4 | Coordinate System | |||
| Horizontal Coordinate Scheme | Universal Transverse Mercator | |||
| UTM Zone Number | 15 | |||
| Horizontal Datum | NAD83 | |||
| Horizontal Units | meters | |||
| Section 5 | Attributes | |||
| Overview | ||||
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| Section 6 | Distribution | |||
| Publisher | ||||
| Publication Date | ||||
| Contact Person Information | Brian Gelder,
Iowa State University 3354 Elings Hall Ames, IA 50011 Phone: Email: bkgelder@iastate.edu | |||
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| Online Linkage | None available | |||
| Section 7 | Metadata Reference | |||
| Metadata Date | 01/31/2025 | |||
| Contact Person Information | Kristi Nixon,
GIS Specialist Natural Resources Research Institute, University of Minnesota 5013 Miller Trunk Highway Duluth, MN 55811 Phone: 218-788-2645 Email: knixon@d.umn.edu | |||
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