http:www'uaf'eduospundergraduate'html

1
http//www.uaf.edu/osp/undergraduate.html

• Funding for undergraduate travel, research, etc.

2
(No Transcript)
3
Arcview Legend Files
Use legend editior to save you legend to a file
(extension .avl)
4
Grids

• Typically cell values represent classes or
  categories
• Use spatial analyst extension to work with grids
• Examples land cover, elevation grids
• Use File menu?Import Data Source to convert text
  file (ASCII) to grid

5
(No Transcript)
6
NCOLS 3 NROWS 3 XLLCORNER 0 YLLCORNER 0 CELLSIZE
10 3 5 2 5 5 2 3 2 2
NCOLS 3 NROWS 3 XLLCORNER 0 YLLCORNER 0 CELLSIZE
10 5 5 3 5 3 3 3 2 2
7
Map Calculator

• Analysis Menu?Map Calculator
• Output is temporary grid (Map Calculation)

8

9
Combine Request

• Analysis Menu?Map Calculator
• Requests always start with a period
• Parenthesis after a request
• means list of grids means a grid

10
(No Transcript)
11
(No Transcript)
12
(No Transcript)
13
(No Transcript)
14

15
Plot each band values for each pixel and assign
to a class
16
Interation 1
17
Compute new class means and plot new class means,
then assign class members closest to each new
class mean.
18
(No Transcript)
19
(No Transcript)
20
Classified Spectral Class Grid
Input Image
21
http//biology.usgs.gov/npsveg/aa/sect5.html

• 30 random points
• 10 water, 1 incorrect classed as unveg land
• 10 unvegetated land, 1 incorrect as water, 3
  incorrect as veg land
• 10 vegetated land, 2 incorrect as unveg land

ERROR MATRIX
Reference Truth
Map Predict
22
Class Accuracy

• Producers accuracy
• Consumers accuracy

Producer's accuracy is computed by looking at
the reference data for a class and determining
the percentage of correct predictions for these
ground truth samples. Consumers or userss
accuracy is computed by looking at the map
predictions or cover class pixels and determining
the percentage of correct predictions for that
cover class.