(This functionality is available with the Input / Output module)
This topic documents the concept of using feature codes and operation codes when performing field surveys that are to be processed in the system.
Feature Codes
Feature codes are entered with observations and are used to pre define the attributes of the object being observed.
When a field survey is processed by the system, the feature codes used in the survey are matched to feature codes in a user selected code table. The code table is first set up by the user to pre define the attributes that are to be associated with each feature code used in the field.
The feature code structure is totally user definable and is interpreted by the system according to the structure settings made in the Code Definition dialog box.
The feature code field size may be set at between one and ten characters.
There is an option to define up to two of the characters at the start or end of the feature code field as string identifiers. This allows points with identical string identifiers to be joined by lines in the reduction process.
If the feature code structure has a string identifier component, you can also define a non stringing character to be used when points are not to be part of a string.
If the feature code structure does not have a string identifier, the system will string consecutive contiguous points which have identical feature codes. There is also an option to string all points of the same feature code as they are encountered, whether they are consecutive or not.
The only exceptions to these stringing rules are that fixed coordinate points are never strung regardless of their feature codes. Such points appear in a field file as record types 061 to 065.
It is imperative that the feature code structure defined in the code definition dialog box matches the actual code structure used in the field. Otherwise the codes will not be interpreted or strung as desired.
The flexibility available in defining the feature code structure, as well as lookup tables and code tables, ensures that virtually any field coding system used can be successfully interpreted by the system.
See Also
(for further information about code tables)
(for defining the feature code structure)
Operation Codes
Operation codes are special codes that may be entered in some data recorders, whereby the system will automatically use the operation codes to carry out certain functions in the reduction process. An example of an operation code use may be to define a string line as a spline. The operation codes available for use with the system are documented under the topics listed below by instrument manufacturer. Select the appropriate topic to review the operation codes available.
Leica GPS-500 Field Operations
This is an alternative set of operation codes for Leica/Wild Instruments which closely resembles the operation codes used in Wildsoft field coding.
Husky Hunter / Optimal Field Operations