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How Edit Signatures works

Available with Spatial Analyst license.

The Edit Signatures tool is designed to modify the existing signature file. Most frequently, this tool is used to reduce the number of classes. To determine which class signatures should be changed to produce a more accurate classification, view the tree diagram with the Dendrogram tool.

Example

The following example shows how a signature file with 14 classes is edited to have only 7 classes. This is done by deleting unnecessary classes and merging like classes. The following is the input signature remap file that will be used to edit the signature file. It will merge classes 8 and 21 with 3, 9 with 1, 14 with 4, 15 with 7, and 23 with 6. It will also delete class 11.

 8 : 3
 9 : 1
11 : -9999
14 : 4
15 : 7
21 : 3
23 : 6

Output signature file

The resulting output signature file from Edit Signatures is listed below:

# Signatures Produced by ClassSig from Class-Grid zsamp12 and Stack redl123
#    Number of selected grids
/*           3
#    Layer-Number    Grid-name
/*           1       redlands1
/*           2       redlands2
/*           3       redlands3

# Type  Number of Classes  Number of Layers  Number of Parametric Layers
   1             14               3                3
# ===============================================================

#  Class ID     Number of Cells    Class Name
        1             4493         
# Layers         1            2            3
# Means    
             	 57.4801      55.1022      34.5615
# Covariance
1           	755.8841     389.1188     165.2408
2           	389.1188     451.9519     248.4967
3           	165.2408     248.4967     163.7970
# -------------------------------------------------------

#  Class ID     Number of Cells    Class Name
        2             1464         
# Layers        1            2            3
# Means    
            142.5451      48.3053      22.8818
# Covariance
1           301.2310      61.3188     -24.5077
2            61.3188     150.2574     102.7169
3           -24.5077     102.7169     103.9020
# ------------------------------------------------------

#  Class ID     Number of Cells    Class Name
        3            142         
# Layers        1            2            3
# Means    
            226.2817      94.4225      25.4789
# Covariance
1          1250.7286     448.2489     -11.1146
2           448.2489     302.1464      75.3991
3           -11.1146      75.3991      67.7407
# ------------------------------------------------------
#  Class ID     Number of Cells    Class Name
        4            399         
# Layers        1            2            3
# Means    
            161.6867     174.5113     177.4386
# Covariance
1            29.0699      23.6907      32.0523
2            23.6907      65.3359      38.7300
3            32.0523      38.7300      55.1061
# ------------------------------------------------------

#  Class ID     Number of Cells    Class Name
        5             1476         
# Layers        1            2            3
# Means    
              0.0589     0.0976     1.2026
# Covariance
1             3.1321     2.4268     3.5081
2             2.4268     2.8922     3.9924
3             3.5081     3.9924     6.7094
# ------------------------------------------------------
#  Class ID     Number of Cells    Class Name
        6               225         
# Layers        1            2            3
# Means    
            138.5378     140.1644     168.5600
# Covariance
1           151.4461     120.3978     142.3225
2           120.3978     142.5309     128.7914
3           142.3225     128.7914     149.9618
# ------------------------------------------------------

#  Class ID     Number of Cells    Class Name
        7               383         
# Layers        1            2            3
# Means    
            129.2950     146.6136      97.0836
# Covariance
1            72.6745      21.6483      74.7947
2            21.6483      20.2377      38.7392
3            74.7947      38.7392     164.1239
# ------------------------------------------------------

#  Class ID     Number of Cells    Class Name
        8                948         
# Layers        1            2            3
# Means    
            251.3091      76.7447      22.7795
# Covariance
1            49.3943       2.3736     -16.1440
2             2.3736      89.0773      13.2319
3           -16.1440      13.2319      12.8732
# -----------------------------------------------------
#  Class ID     Number of Cells    Class Name
        9               446         
# Layers        1            2            3
# Means    
            100.0022      61.6861      39.1323
# Covariance
1            50.9685       3.0816      -2.7846
2             3.0816      81.6765      57.7427
3            -2.7846      57.7427      57.0229
# ------------------------------------------------------

#  Class ID     Number of Cells    Class Name
       11              244         
# Layers        1            2            3
# Means    
            133.8402      85.3934      84.4672
# Covariance
1            78.2336      -1.2908     -20.0320
2            -1.2908      58.4454      29.1652
3           -20.0320      29.1652      77.5586
# -----------------------------------------------------

#  Class ID     Number of Cells    Class Name
       14             186         
# Layers        1            2            3
# Means    
            159.5753     212.3172     163.9677
# Covariance
1           112.8186     197.4165     155.3484
2           197.4165     432.0772     319.2643
3           155.3484     319.2643     265.5773
# ------------------------------------------------------

#  Class ID     Number of Cells    Class Name
       15             149         
# Layers        1            2             3
# Means    
            144.9262     154.2483     113.9262
# Covariance
1           191.0824      27.4239     137.5486
2            27.4239      81.4717      13.0252
3           137.5486      13.0252     114.0283
# -----------------------------------------------------

#  Class ID     Number of Cells    Class Name
       21             253         
# Layers        1            2            3
# Means    
            235.0514      98.1107      32.6324
# Covariance
1           278.8188      81.3633     -12.5802
2            81.3633     132.3131      36.1639
3           -12.5802      36.1639      38.6699
# ----------------------------------------------------
#  Class ID     Number of Cells    Class Name
       23             121         
# Layers        1            2             3
# Means    
            145.3223     143.9669     155.3058
# Covariance
1            21.4536      16.4524      24.5590
2            16.4524      43.2322      14.8685
3            24.5590      14.8685      79.9140

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