Satellite / Aerial Images
Sections
Terminology
- "band"
- refers to an image which represents a certain range of the
electromagnetic spectrum, e.g. the "Red band"
- "panchromatic"
- a monochromatic image - shades of grey (greyscale) from black to
white, which generally covers a wide part of the spectrum, hence "pan"
- "multispectral" means color information, but usually not visible
light spectrum
- when these bands, which include non-visible light, are combined, the
result is a "false color" image
- common bands: red, green, infrared
- sometimes abbreviated to MSS
- "geospecific" means a texture that represents what the ground
actually looks like in a specific location
- "geotypical" means a generic texture
- e.g. "grass" which is used for any grassy area
- aerial images are usually either visible light or infrared
- satellite images are usually not visible light, since the visible
spectrum (especially blue) does not travel well into space
Cell Registration
- is it good to know the cell registration
of an image, though nearly all images rasters are supplied with data extents
which are based on the corners of each pixel