Aerial Photography Date Files

• 1930's Air Photo Date Centroids
• 1950's Air Photo Date Centroids
• 1960's Air Photo Date Centroids
• 1970's Air Photo Date Centroids
• 1980's Air Photo Date Centroids
• 1990's Air Photo Date Boundaries
• 2002 CIR Air Photo Date Boundaries
• 2007 NAIP Air Photo Date Boundaries
• 2007 2x4 Air Photo Date Boundaries
• 2008 NAIP Air Photo Date Boundaries
• 2009 NAIP Air Photo Date Boundaries
• 2009 2x4 Air Photo Date Boundaries
• 2010 NAIP Air Photo Date Boundaries
• 2010 2x4 Air Photo Date Boundaries
• 2011 NAIP Air Photo Date Boundaries

2002 Color-Infra-Red Aerial Photography Support Data

• Adjusting the color-balance/contrast of county mosaics, in ArcView
• Using the 2002 CIR document
• Diapositive Centers shapefile
• Diapositive outlines shapefile
• Ortho Centers shapefile
• Ortho Outlines shapefile
• Ground-truthing shapefile
• Date Summary .dbf file
• Photo Day-Time .dbf file
• Stand-Alone MrSid Viewer

2000 Census Support Data

• Census Readme
• Census Profile Technical Documentation
• Summary File 1 Technical Documentation
• Summary File 3 Technical Documentation
• Summary File 1 Block and Tract Tables
• Summary File 3 Block-group and Tract Tables
• Fields of Interest Readme
• Fields of Interest Summary File 1 Tables
• Fields of Interest Summary File 3 Tables
• Legislative Block Assignment Files

LiDAR

•    Lidar Flight Dates

National Hydrogrophy Dataset (NHD) Support Data

• NHD quickstart Tutorial
• NHD Toolkit
• NHD Toolkit Tutorial

Soils Support Data

• Iowa Soil Properties and Interpretations Database (ISPAID) Users Guide ver.7.0
• ISPAID Soil State-wide .dbf file
• ISPAID Spot State-wide .dbf file
• ISPAID Drain State-wide .dbf file
• Soil Survey Geographic (SSURGO) Data Base - Data Use Information

Watershed Support Data

• Basin Statistics and Land Cover / Land Use .dbf files