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Kortlægning med satellit data
 
En model af et kort med gridnet
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 HI-RES GIF (Size: 19 kb)
Et simpelt eksempel på korologisk kortlægning kan vise nogle fundamentale egenskaber ved et satellitbillede: I hvert kvadrat i gridnettet tælles antallet af huse. Resultatet af optællingen er en korologisk matrice.

Credits: ESA
 
  Korologisk matrice
 
Chorological matrix
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 HI-RES GIF (Size: 32 kb)
Chorological matrix.

Credits: ESA
 
  Histogram
 
Two classification examples based on a histogram
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The illustration shows two classification examples based on the histogram shown. One classification has four classes (agriculture, village, town, and other) whereas the other has two (rural and town).

Credits: ESA
 
  Klassifikation
 
Suitable classification depends on the purpose of the map
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 HI-RES GIF (Size: 19 kb)
Suitable classification depends on the purpose of the map.

Credits: ESA
 
 
Classifications often require compromise
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 HI-RES GIF (Size: 14 kb)
Classification often requires compromise.

Credits: ESA
 
 
A digital image is a chorological matrix
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 HI-RES JPEG (Size: 31 kb)
A digital image is a chorological matrix. The size of the squares in the grid is equal to the spatial resolution of the (satellite) image and depend upon the instrument providing the data. Similarly the numbers in the grid are determined by the ability of the equipment to distinguish variations. Digital images often contain values between 0 and 255, which are matched exactly by the capacity of 1 byte in the computer.

Credits: ESA
 


 
 
 
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