Lecture 6: Raster structures
Cell =
Pixel
n =
total # of rows
m =
total # of columns
# of cells =
n*m
What is spatial resolution?
smallest distance where a change can be observed
What is the smallest unit in spatial resolution?
Pixel or cell
High spatial resolution =
raster with cells equal to a small area on the ground and smaller details can be detected
Spatail resolution is calculated by=
cell width x cell height
Geometric resolution=
cell size
What does data type integer store?
negative numbers
for larger numbers you can use:
double (or long) integer
What is at least needed to store decimal numbers?
4 bytes
Decimal numbers represented are called....
floating point numbers
4 bytes representation is called...
singel precision real
8 bytes representation is called...
doubel precision real
What do maps may require in order to be precise enough?
double precision real