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Bernese GPS Software Version 5.0 - Bernese GNSS Software

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22.8 Station Related Files<br />

By using such a cluster definition file it is possible to define clusters of sites. The intention<br />

is to handle all sites within a cluster with correct correlations in program <strong>GPS</strong>EST. If the<br />

correct handling of the correlations is not required (not the highest accuracy requirements)<br />

a subdivision into clusters is not necessary. Due to memory and computer time limitations<br />

it is not recommended to handle more than about 40 sites with correct correlations. If your<br />

network consists of considerably more sites, you may use the cluster definition file to form<br />

clusters of baselines with the program SNGDIF, then process the individual clusters (with<br />

correct correlations), and finally combine the cluster normal equation using ADDNEQ2 to<br />

a complete network solution. It only makes sense to specify a cluster definition file, if you<br />

also specify a cluster definition output file in SNGDIF (see next section).<br />

Note: The maximum number of clusters allowed is 100 (00–99).<br />

22.8.17 Cluster Definitions (Output)<br />

Type: ASCII<br />

Directory: Campaign-specific directory STA.<br />

Extension: CLB<br />

Content: Cluster definitions to be used in connection with <strong>GPS</strong>EST.<br />

Created by: SNGDIF (”Menu>Processing>Baseline file creation”), MKCLUS (”Menu>Service>Automated<br />

processing>Form clusters”).<br />

Used by: <strong>GPS</strong>EST (”Menu>Processing>Parameter estimation”) in an automatic processing for<br />

the selection of the observation files.<br />

Example: Figure 22.44 and ${X}/DOC/EXAMPLE.CLB.<br />

If you specify a cluster definition input (CLU) file in SNGDIF (see previous section) containing,<br />

e.g., n clusters, you should also specify a cluster definition output (CLB) filename (e.g.,<br />

CLUST ). SNGDIF then creates, according to the cluster numbers cc specified in the CLU file,<br />

n files with the filenames CLUST cc.CLB. In each of these files the baselines belonging to the<br />

cluster number cc are stored. Each baseline is assigned to the cluster the first of the two<br />

stations belongs to.<br />

A cluster definition output file may be used for a cluster-wise parallelization of the processing<br />

in the BPE. In each parallel run of program <strong>GPS</strong>EST the observation file selection may be<br />

specified by inserting the content of the file to the corresponding keyword in the program<br />

input file using a putkey-command (see Section 19.6.4).<br />

Cluster definition file entries written by program MKCLUS include path and extension,<br />

entries written by program SNGDIF contains the file base names. The menu system handles<br />

both cases.<br />

CBGU1951<br />

CHEI1951<br />

KELP1951<br />

YAKT1951<br />

........<br />

Figure 22.44: Cluster definition output (CLB) file for one particular cluster (from SNGDIF).<br />

<strong>Bernese</strong> <strong>GPS</strong> <strong>Software</strong> <strong>Version</strong> <strong>5.0</strong> Page 531

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