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

2. STEPS FOR DIGITIZATION OF CADASTRAL VILLAGE MAPS
The process of digitization can be summarized in following steps (Fig 1):

1. 
   Collection of analog cadastral village maps (sheet-wise)
   
2. 
   DQC-1 (Input data evaluation)
   
3. 
   Tracing or re-production of the analog map
   
4. 
   Sheet indexing and scanning of the analog maps (converting analog to raster cadastral images)
   
5. 
   DQC-2 (check DPI, format, quality, speckle removal and cleaning)
   
6. 
   Grid correction of the scanned (raster) map
   
7. 
   DQC-3 (grid overlay checking with scanned map)
   
8. 
   Feature abstraction from the scanned map
   
9. 
   DQC-4 (check for the accuracy of the type, location and attributes)
   
10. 
    Layout and printing hard copy for evaluation by the Land Revenue Department (LRD)
    
11. 
    DQC-5 (detailed checking of the digitized features by the LRD)
    
12. 
    Incorporation of the corrections suggested by the LRD
    
13. 
    Sheet mosaicing of a village
    
14. 
    DQC-6 (feature continuity and attribute carry forward)
    
15. 
    Conversion of the digitized data into topologically-correct GIS data format
    
16. 
    DQC-7 (checking for GIS feature conversion, attributes, null and duplicate errors)
    
17. 
    Final deliverables (hard copy print and GIS data for geo-coding)
    
18. 
    Metadata preparation
    

2.1 Collection of the sheet-wise analog cadastral village maps
Before executing the project, availability of sheet-wise cadastral maps have to be ascertained. The maps should be up-to-date and in good condition. The condition should be such that it can be scanned through a contact (roller) scanner or a flat-bed scanner (prefer flat-bed scanner). The DQC-1 has to be performed at this stage before it is sent for scanning. The quality check procedure will include the condition of the map – it should not be a cloth mounted, nor be torn or ragged, and not have too many folds. The control points (tics) should be available. The features of the map should be clear and distinguishable. Parcel number (khasra no.) should be distinct and readable. All symbols (alamats) should be distinct and properly understandable. Once found acceptable on all the above-mentioned characteristics, the sheet is tagged suitable for scanning.