Jachs WilhelmDatabases for Measurements
1994 Leica AG made a new concept available to its clients to simplify
the processing and the management of data. For this concept, called
„Open Survey World" (OSW), the database GEODB was developed as an
interface or link between surveying and computing. The data model of
GEODB is conform to the internal storing structure of Leica’s measuring
instruments. Therefore it’s impossible to use the database respectively
OSW with other instruments (e.g. Geodimeter). But it’s also difficult
to extend or alter the data model. For that reason a concept is needed
more flexible and independent of any type of instrument or data format.
work is restricted to the development of a database which can be used
for the storage and administration of data collected by terrestrial
field surveys. Satellite positioning systems will not be considered.
Different measurements are analyzed to develop a general
entity-relationship diagram. The ER-model has to be extended by
integrating a special concept for changing and working on data. This
concept prevents information from getting lost. Two extendable routines
for the import and the export of data will make it possible to read and
import different data formats and to provide computing programs like
ANAG with necessary data. Thus the database can also be seen as a
flexible link between surveying and computing.
three different surveys are chosen to check the routines and to show
the efficiency of the database. For every example the program ANAG was
used for adjustment computations. Usually there is no interface for
this program and all the values must be imported manually. But in this
case the database was to provide ANAG with necessary data which was a
great advantage. For the future it will be important to manage the
storage of measurements of satellite positioning systems. So it will be
possible to work on terrestrial and satellite measurements to use them
for common computations especially for the remeasurement and
computation of the net of control-points.