Leica DM2000, Planning a Survey
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5 Planning a Survey
Jobsite Investiga-
tion
To carry out a survey with the DS2000 in the most efficient way, gather all available
information:
• Make yourself familiar with the jobsite features.
• Obtain technical maps about existing utilities on the jobsite.
• Supplement the acquired scan data by opening manholes onsite.
Jobsite Features The basic requirement for carrying out a survey is understanding the features of the
jobsite. When gathering information about the jobsite, keep in mind the objectives of
the survey. Consider the following points when preparing the survey:
• Do you need any specific permissions to carry out the survey on the jobsite, for
example, access permission to pedestrian zones or permission to interrupt the
traffic flow?
• Are there any difficulties in accessing the jobsite? (Available space, any architec-
tural features forming an obstacle, etc.).
• Is the jobsite in an area with a high level of urban traffic, such as streets, squares
or pavements? Are there parked cars that could be in the way during the survey?
Technical Maps of
existing utilities
Technical maps of existing utilities are normally created by public utility companies.
Such maps give a schematic overview about the type and position of utilities that are
constructed and managed by the public utility companies. Even if these maps are
generic, they can give a first impression of the existing utilities and provide additional
information during the data acquisition and interpretation phase.
To obtain technical maps of the jobsite, contact the cartographic or planning
office of the different utility companies. Clearly specify the streets and areas
of interest. Request the maps early enough in advance to the survey, to ensure
that the maps are available for the data acquisition phase.
The following list contains the most important types of utilities that need to be consid-
ered:
• Street lights
• Low, medium and high-voltage electricity cables
• Telephone cables
• Gas pipes
• Water supply pipes
• Sewage pipes
Opening manholes Once the data acquisition is complete, the opening of manholes on site can provide
you with further information regarding depth, diameter and direction of the utility.
This information serves as reference data during the interpretation phase and allows
you to estimate the propagation velocity in order to calculate the depth of a utility as
precisely as possible.
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