Validate an infolayer with another layer as a reference layer

This page describes how to use the Validation window, used as tool to analyse grids and images.

See below a how to for each type:

See also:


Thematic or classified image validation:

* Sampling rate: defines an interval, in pixels, defines a rate with the samples will be taken. If sa = t5, this means that for each 5 lines and columns (a 5x5 pixels region), a pixel will be taken as a sample for the validation;

* Kappa index: is a statistical measure of inter-rater agreement for qualitative (categorical) items. The kappa index has the following agreement table:

Kappa Index Agreement
< 0 No agreement
0.00 a 0.19 Poor
0.20 a 0.39 Weak
0.40 a 0.59 Moderate
0.60 a 0.79 Strong
0.80 a 1.00 Excellent

Kappa index calculation example:


Example: Classified image validation:

The following picture shows a Validation window example.


The following picture shows a Report window example.


The following picture shows a Graph window example.




Regular grid validation:

Exemplo Validação de Grades:

The following picture shows a Validation window example.


The following picture shows a Report window example.


The following picture shows some Graph window examples.