You will need a place name, the latitude and longitude, or any other information that will help to distinguish your area of interest.Learn more:Maps, Imagery, and PublicationsProducts & Data Available
A USGS DRG is a scanned image of a U.S. Geological Survey (USGS) topographic map. The term refers to products created in the period 1995-2000 that conform to a specific technical standard. This product series is now inactive, replaced by the larger and...
Digital Line Graphs (DLG) are an early GIS vector data product. The product line has been inactive since the mid 1990s, and has been superceded by more modern GIS datasets.  
Focal length is the distance from the middle of the camera lens to the focal plane (i.e. the film). As focal length increases, image distortion decreases. The focal length is precisely measured when the camera is calibrated. Knowledge of the focal length...
Simply defined, scale can be expressed as the ratio or proportion between a distance on the aerial photographs (or maps) and the actual distance on the ground or land surface. It is a ratio that could represent any unit of measurement and this ratio is...
Remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring its reflected and emitted radiation at a distance from the targeted area. Special cameras collect remotely sensed images of the Earth, which...
The majority of USGS aircraft photography is used for cartographic purposes. Image distortion is minimized when photographs are acquired looking straight down or vertically.Learn more:National Aerial Photography ProgramNational High Altitude Photography...
Yes.  Scanning of the EROS film archives is following a plan to capture images from rolls at risk of decay from vinegar syndrome. Science requirements are also reviewed on a regular basis, but a formal, on-line schedule is not available at this time....
The high resolution orthophoto and the Digital Orthophoto Quadrangle (DOQ) provides the most detail. You would probably be able to identify your neighborhood. There is no guarantee that your home would be distinguishable.What you can distinguish is...
Once you've gathered as many facts about family history and customs as possible, turn to maps to uncover more specific information or to solve historical mysteries.Old and new maps can help you track down facts about a branch of your family. How? In the...