Veris Technologies VIS_NIR Spectrophotometer Probe - Operating Instructions - Manual (Page 31)

OM17-P4000VIS-NIR
4-10
5. Clustering – Clusters the principal components (PC's) of the spectra into the same
number of clusters as desired sample points. When the clustering program opens it will
ask if the settings are correct. The settings this refers to are the number of clusters or
sample locations, and the n
umber of PC’s to use for clustering. By default there will be
3 PC’s used and 15 locations to sample. If more sample locations are desired, then this
can be changed at this time. Up to 10 PC’s can be chosen, however 95% of the data is
contained within t
he first 3 PC’s. If these settings are acceptable, then select YES or, to
update the settings press NO. If NO was selected, update the settings and press
continue to begin clustering the data. Once the data has been clustered, the program
status will say done and the complete light will be lit. Press close window or F12 to
return to the main interface.
For Probe mode the program will suggest which GPS locations along with which 10cm
increment of soil will provide optimal calibration based on the spectral variability.
Map of proposed sample locations
based on clustering. Each circle
PC scores file to be clustered. represents a sample location.
File where GPS
locations of
proposed
sample locations
is stored.
Number of
points in each
cluster.
The number of
clusters should
be equal to the
number of
desired sample
locations.
This indicates
the status of the
program. First
the program will
space the
spectra evenly,
then cluster the
spectra.
Each plot
represents a
cluster.
Map of all data
with each color
representing a
different cluster.
Figure 13