Table 2.
Aerial photograph data.
| Product | Resolution
|
||
|---|---|---|---|
| Years | Spatial | Spectral | |
| Historical Photos | 1939-current | Varied | varied |
| National High Altitude Photography (NHAP) | 1980–1987 | 2 m | BW, CIR |
| National Aerial Photograph Program (NAPP) | 1987–present | 1 m | BW, CIR |
| National Agriculture Imagery Program (NAIP) | 2003–present | 1m and 2m | Color, CIR |
Selected websites:
Earth explorer: http://earthexplorer.usgs.gov.
Geospatial data gateway: http://datagateway.nrcs.usda.gov/GatewayHome.html.
Global Visualization Viewer (GloVis): http://glovis.usgs.gov.
Historic Aerials: http://www.historicaerials.com/.
Illinois Natural Resources Geospatial Clearinghouse: http://www.isgs.uiuc.edu/nsdihome/webdocs/ilhap/.
Iowa Geographic Map Server: http://ortho.gis.iastate.edu/.
The National Archives: http://www.archives.gov/index.html.
USDA Farm Service Agency: http://www.fsa.usda.gov/.