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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004 
  
to the user level by displaying the computation and their results, 
to navigate between different computations, survey points and 
measurements. Furthermore, SQL Queries provide easy 
functionality to navigate through the huge data amount a 
surveyor needs to have in the field. 
The Sketch 
A sketch is often used as part of the field book to record 
information not recorded in the field-book. COGO information 
does not always have a physical source but may sometimes come 
from the implied knowledge of the user. For example street edges 
may often be accepted in the field as having parallel edges. Leica 
MobileMatriX offers tools (available if working with TabletPCs), 
which allows writing field notes and sketches directly in 
MobileMatriX (see Fig. 3). 
  
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Figure 3: Working with the TabletPC tools 
Attribute collection in the field 
While out in the field and observing features, the survey crew or 
other specialist can directly connect the feature attributes and 
store them directly in the database together with the feature (see 
Further more pictures or 
to each feature. 
    
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Figure 4: Attribute collection 
Synchronization with ESRI Databases 
Leica MobileMatriX provides tools for synchronizing the 
office database with the field database and vice versa. More 
and more mobile users, such as a field survey crew, require 
similar functionality. They need to work independent from an 
organization's infrastructure and database connection, often 
documents can be attached 
  
for a longer period of time. When preparing for a particular 
work order or project, the relevant data would be transferred 
to a portable device, such as a TabletPC. This device would 
then be disconnected from the network, enabling the user to 
operate independently. 
Mobile users may then continue to work with and modify the 
data in the field even though they are disconnected from the 
office network. When a connection to the network is re- 
established, any changes made to the data will be transferred 
to, and integrated with, data maintained in the central 
database. 
Survey Features 
Survey Feature - the fundamental MobileMatriX object used 
when surveying. When surveying, a Survey Feature should be 
created for each real-world object that is about to be surveyed. 
Leica MobileMatriX makes it possible to fill the gap between 
surveying and GIS by using survey points to define the 
vertices of features. This allows the user to link the existing 
feature data with the measured points in the field. Instead of 
deleting valuable thematic information and creating a feature 
completely new, the existing feature can be transformed to the 
accurate position measured in the field or new features can be 
surveyed while the thematic feature information is linked to 
the survey point. 
By linking features to survey points it is possible to associate 
feature geometry with the accuracy defined for the survey 
points (see Fig. 5). This gives the user additional knowledge 
about the quality of features, whether they come from an old 
map that has been digitized or from a highly accurate GPS 
device. With Leica MobileMatriX, it is always possible to 
have information on feature source and quality. Survey points 
are associated with measurements and computations and can 
be linked to features in the Geodatabase. These features are 
called survey features. Survey features should not be thought 
of as different to any other features. They are simply features 
that have become survey-aware and are created while you 
perform a survey 
task 
  
GIS Layer 
  
  
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Survey Layer 
  
Figure 5: The link between survey and GIS data 
The end result of an update is that each survey feature geo- 
metry is altered to coincide with the geometry of the link survey 
points. ; 
An easy example for that functionality, illustrated in Fig.6: You 
simple sketch the feature you want to survey, then you simple 
survey, maybe using a TPS or GPS, the vertices of the building