Please keep in mind that ArcET is just a tool, appropriate data need to be prepared to use it for any specific work. Following are some websites where you might be able to get free datasets for inputs to ArcET.

• For DEMs

  
  

  • LAND PROCESSES Distribted Active Archive Center(LPDAAC) for free lkm DEM.

  • The National Map Seamless Data Distribution System at USGS for 30m NED by interactive selction of region. This source may be good for any project at county scale.

• For station-based meteorological data:
  • National Climatic Data Center(NCDC) for US stations.
  
  

• In case you want to use PRISM monthly precipitation grid as reference (US only), visit PRISM website for available datasets

• In case that you need to make your own crop coefficient curves, you can refer to the AgriMet Crop Coefficients from The Pacific Northwest Cooperative Agricultural Weather Network .

• If measured station-specific radaition data is unavailable, you may check NOAA/NESDIS Surface Radiation Budget (SRB) products developped at the University of Maryland for any alternative surface radiation data.