engleski

Development of a Model For Land Survey Data based on ISO 19156

Today, there are number of data formats used for storing of land survey data. Mostly, each manufacturer of land survey instruments has its own data format defined. Standardization of methods for collecting, processing and exchange of spatial data (and data in general) is a necessary prerequisite for faster, safer, and more efficient use and exchange of data. Currently there are number of international standards which define concepts of spatial data exchange. The Land Administration Domain Model (LADM), besides a generic model for land administration systems, provides the support for modelling of relationships between cadastral data and land survey procedures. OGC Observations and Measurements (v2.0) (O&M) specification, also published as ISO 19156, defines a conceptual schema for observations and features involved in sampling when doing observations. LADM and OGC O&M are associateed through LADM class LA_Source, i.e. its child class LA_SpatialSource. In the past few years the situation in Croatia has improved. State Geodetic Administration (SGA) issued technical specification for determination of coordinates of points in official coordinate system which proscribed the manners how survey should be done, which accuracy has to be satisfied and other important details. Also, the data format for storing measurement data is defined so every licensed surveyor has to provide coordinates of measured points, along with other metadata in a strictly defined CSV data format. This is a great step forward because the manner of acquiring and exchange of land survey data is more strictly defined, however such approach has some deficiencies which will be explained later in this paper. This paper analyses the data models and the legislation related to surveying and manners of processing and exchange of survey results on various use cases in Croatia, primarily through LADM and OGC O&M. Based on that analysis we developed the conceptual model for a simple GNSS observation.

land survey; OGC Observations and Measurements; data exchange; Geography Markup Language; Land Administration Domain Model

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