Draft operational guidelines of digital india land records modernization programme (dilrmp) introduction

6. Conversion of the digitized data into topologically correct GIS data format
6.1 After mosaicing, the digital data is converted into topologically-corrected GIS data features. The GIS data will have separate point, line, polygon and annotation features. The strength of the GIS features is the establishment of the spatial relationships within and between the various features with respect to position, containment, contiguity, proximity, adjacent and intersection. After establishing the topology, the attribute data in the standard structure should be filled up. The unique primary key and the foreign key are generated. The completeness and accuracy of the attributes are checked by both display and automatic S/W method.


6.2 Null and duplicate attributes’ lists are generated, both as text file and spatial data outputs. This forms part of the DQC-7 procedure. The error report is again evaluated and checked. Wherever possible, corrections are incorporated, or else tagged with appropriate error codes. The data, at this stage, is ready for the further process of overlaying on the satellite data and query.


7. Final deliverables (hard copy print and GIS data for geo-coding)
The final hard copy print is taken on a paper of specified thickness (preferably 150 GSM of A1 size) of the actual sheet size for archival. The GIS data in prescribed format has to be stored in the central data warehouse and used for further processing of linking with the RoR data.


8. Metadata preparation
8.1 The system and procedures of database generation should evolve a strong metadata, for which the metadata standard has to be designed. The objectives of the standard are to provide a common set of terminology and definitions for the documentation of digital geospatial data. The standard establishes the names of data elements and compound elements (groups of data elements) to be used for these purposes, the definitions of these compound elements and data elements, and information about the values that are to be provided for the data elements.


8.2 The major uses of metadata are:

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  to maintain an organization's internal investment in geospatial data,
  
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  to provide information about an organization's data holdings to data catalogues, clearinghouses, and brokerages, and
  
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  to provide information needed to process and interpret data to be received through a transfer from an external source.
  

8.3 The information included in the standard are based on four roles that metadata play:

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  Availability -- data needed to determine the sets of data that exist for a geographic location.
  

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  Fitness for use -- data needed to determine if a set of data meets a specific need.
  
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  Access -- data needed to acquire an identified set of data.
  
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  Transfer -- data needed to process and use a set of data.
  

Finally, developed metadata will store information pertaining to the each cadastral village map layer and tabular data available from all sources. Future metadata should also describe the updation rate, time and history of the land transaction.