Table 1. The list of input data.
| Data | Source | Description | Year |
|---|---|---|---|
| DEM | MD-DNR | LiDAR-based 2 meter resolution | 2006 |
| Land use | USDA-NASS | Cropland Data Layer (CDL) | 2008 ~ 2012 |
| MRLC | National Land Cover Database (NLCD) | 2006 | |
| USDA-FSA-APFO | National Agricultural Imagery Program digital Orthophoto quad imagery | 1998 | |
| US Census Bureau | TIGER road map | 2010 | |
| Soils | USDA-NRCS | Soil Survey Geographical Database (SSURGO) | 2012 |
| Climate | NCDC | Daily precipitation and temperature | 1999 ~ 2008 |
| Stream flow | USGS | Monthly stream flow | 2001 ~ 2008 |
| Water quality | USGS and CBP | Daily grab NO3-N samples | 2001 ~ 2008 |
Note: MD-DNR stands for Maryland Department of Natural Resources. USDA-FSA-APFO stands for USDA-Farm Service Agency-Aerial Photography Field Office.