Presentation on theme: "Digitization of cadastral maps, its integration with computerized R-O-R data and launching of Bhu – Chitra For CITIZENS [AS IMPLEMENTED IN WEST BENGAL]"— Presentation transcript:
Digitization of cadastral maps, its integration with computerized R-O-R data and launching of Bhu – Chitra For CITIZENS [AS IMPLEMENTED IN WEST BENGAL]
Details of presentation Brief on rich tradition of cadastral mapping in West Bengal Digitisation of Cadastral Map Computerised services to citizens Integrating RoR database with its digitized maps Single window mutation service on registration- status Achievements
Cadastral mapping & Land Records First series of cadastral survey (CS) to prepare village maps & land records covering State, undertaken & completed during District Survey & Settlement Operations of 1888 - 1940 Revisional Settlement (RS) Operation of CS maps & records conducted during 1954 – 1962 LR settlement operation to update RS maps & records was started in 1972 and is nearing completion. Maps are prepared first & then the RORs
Existing LR cadastral maps in West Bengal Mauza(Revenue village) wise map sheets containing 1000/1200 plots in big size 120 GSM paper [A0 (84cm X 119cm)/A1 (84cmX59cm) size] 68,321 map sheets mostly in scale 1:3960 and rest in bigger scale 1:1980 or 1:990 Covers all 42042 Mouzas of the State
Computerization of Land Records & maps - status Digital keeping of ROR legalised by the State in the year 2000 Manual certified copy of ROR banned & strictly discontinued Employees trained to operate the software to carry out daily business
Computerization of Land Records & maps -status Started in West Bengal during 1986-87 with active involvement of NIC, West Bengal. NIC developed software, named BHUMI in 1989 & its subsequent numerous versions- latest being BHUCHITRA All 36.70 million ROR records are digitally available. 45079 out of 68321 map sheets are digitised & integrated with RORs Digital ROR maintained, updated and provided to citizens from all 341 Blocks of WB
Computerised services delivered to Citizens/Departments Certified Copies of RORs Plot information Plot map (BHUCHITRA) in A4 size paper Digital data also provided to other Government Departments. All these are paid services with nominal charges
Data Updation & On-line Mutation Updation of land records taken up in 2008-09 and till date 69 (of 341) blocks covered Computerised ROR is made at par with the paper ROR and no further correction/operation on paper ROR allowed Paper based Mouza volumes are sealed and subsequent corrections/operations done on digital data using BHUCHITRA software Entire work targeted to be completed by Dec 2010 considering that the work is complex, time consuming and requires 100% checking
REASONS FOR DIGITISATION OF MAPS Printed cadastral maps are in A0 size paper and are difficult to handle and preserve. Number of maps printed is not in large numbers and are not easily available to public. Problem of storage of these maps in block offices. Locating a particular map also takes lot of time. Problem of printing of maps can also be solved by digitization of maps. About 15,000 maps found mutilated or torn which is a hindrance in preparation of LR maps. This problem effectively overcome by using map digitization technique
Details of Digitisation Digitization of cadastral maps and their integration with text Record of Rights (ROR) data is a very complex and technical work Cadastral map Digitisation calls for a very high level of accuracy Digitization of map done in 3 Geographical layers i.e. in point, line, area to capture all features in the existing map.
Details of Digitisation Each plot of land is digitized as a polygon and plot numbers, symbols, etc. depicted on the map. Digitised plots (polygons) updatable based on field measurements Software for digitization of map, its integration with R- O-R data developed by NIC, West Bengal. Scheme of digitization of maps initially approved by State Govt. in 2007-08 and later approved & fully funded by Govt. of India.
Digitization Digitization is a process by which Raster Image is converted to a Vector Map
Components of a GIS ready Map. A Map is represented in different Layers, in a GIS ready map. All spatial and non spatial features are represented in different layers.
Representation of Map The most common representation of a map is by using vector data, that consists of points, line and polygons.
Line Layer Line is stored by the sequence of first and last point together with the associated properties
Area layer (Polygon) Polygon is represented by a closed sequence of lines. Unlike line or poly- line (sequence of lines), polygon is always closed. That is, the first point is equal to the last point.
Map Digitization Process 1.Accurate scanning of paper map 2.Vectorization of scanned Map from RASTER format. 3.Building the layers for the Complete map for different map and non map features. 4.Converting each layer to GIS ready map format. (SHAPE file format). 5.Checking of HARD Copy of the line work submitted by the Agency with the Original Map. 6.Checking of SOFT COPY of the map with the specifications. 7.Composing the Map and checking the final plotted map from the soft copy with the original map
Role of Agency 1.Scanning of map Sheets 2.Digitizing the sheets in various layers (area, line & point) 3.Attaching respective plot number to each polygon (vectorised plots) 4.Providing digitized data in *.shp format (all layers) 5.Providing non-map features in different *.gif formats (images) 6.Providing one hardcopy for one – to- one matching with the original
Responsibility of the Directorate Stringent checking of work of the agency to identify any digitization errors, if any, for its correction by the agency COMPOSITION OF a MAP sheet in its final form from all the files (more or less 36 in all) delivered by the agency Printing of final map on A0/A1 size paper for final verification using glass table
SCANNING OF MAP sheets SCANNING ERROR MAY COME FROM POOR PAPER QUALITY FOLDING OF MAPS VARIABLE THICKNESS OF PAPERS DUST ABSORBED IN PAPER SCANNING ERRORS
Dust Should Be Cleaned From Map Maps Should Be Kept In A Flat Position With A Pressure On It, So That to avoid Error Due To Folding Of Maps As Per Variable Thickness Of Papers, Maps may be sorted in different Categories And Setting of Scanner Roller may be adjusted suitably for each categories. AVOIDING SCANNING ERROR
Map Should Be Scanned In A Calibrated Scanner The Scanning Should Be At Least In 300 Dpi Mode A Good Practice To Take A Raster Printing Before Digitizing It, but one should think about the cost AVOIDING SCANNING ERROR
DIGITIZATION of Line Works Any Raster To Vector Conversion Software Like Auto Cad Overlay, R2v Etc May Be Used Maps Can Be Digitized Using Automatic Or Semi- automatic Or Manual Mode During Digitization Raster Should Be Zoomed And The Line Width During Digitization Should Be At Least Six Times Of The Original
Digitize The Line In Such A Way That Each Plot Should Form A Closed Polygon. In That Way It Will Generate The Area Of The Plot A Good Practice is to set Map In 1:1 Scale And Digitizing In Manual Mode only DIGITIZATION of LINE WORKS
ERROR DETECTION PROCEDURE Hard Copy Checking : By taking a print copy from calibrated Plotter and its one to one matching with the original One using glass table Soft Copy Checking : Auto checking of individual digitally calculated plot area with its maually calculated value available in ROR
Error Checking Procedure Using customised NIC Developed Software 1.Compare the digitized mouza area with the Total area recorded in the JL of that mouza with the tolerance of 0.50% up to area of 500 acres and 0.25% for areas above 500 acres. 2.Compare each digitize plot area with the data recorded in ROR with the tolerance as per provision in the technical manual of survey.
Total Area Matching Here the total digitized area is showing 141.53 Acres where as it is recorded in JL as 141.12 Acres
Each & Every Plot Area Checking Here the red marking plots are erroneous. The count showing the erroneous plots are 37 in number.
Generating digital map from 36 files (composed map) COMPOSITION OF all 32 files to create finished MAPS WITH ALL ALAMATS & NON-MAP FEATURES (Using NIC-Developed Software) PLOTTING OF MAPS After Receiving Error Free Digitized Data following Processes are Required
COMPOSITION OF MAPS TO COMPOSE A MAP IT NEEDS DIGITIZED PLOT BOUNDARIES INCLUSION OF 54/92 NON-MAP FEATURES WHEREVER IT WAS IN ORIGINAL MAP INCLUSION OF PLOT NUMBERS INCLUSION OF TEXT IN UNICODE FORMAT INCLUSION OF AUTHENTICATION SEAL, LEGEND, BATA PLOT INFORMATION IN THE FORM OF IMAGE
92 ALAMATHS TO REPRESENT ALL THE NON-MAP FEATURES ON A MAP, DIRECTORATE OF LAND RECORDS & SURVEYS SELECTED 92 SYMBOLS. SOME OF THE SYMBOLS ARE IN-SITU (LIKE BUILDING) AND SOME OF THOSE ARE NOT IN-SITU (LIKE COCONUT TREE, KUCHA BUILDING ETC) TO REPRESENT ALL THE SYMBOLS IN A MAP FURTHER IT NEEDS THE POSITION,WHICH IS TO BE DIGITIZED
DIGITIZATION SHOULD BE IN THE FORM OF LINE (THAT IS FOR RIVER, RAILWAY LINE, ROADS, PONDSIDE ETC) AREA (THAT IS FOR BUILDING WHICH ARE IN- SITU, PAN BOROZE ETC) POINT (THAT IS FOR TRAVERSE STATION, TREE POSITION, TELEGRAPH POST ETC) 92 ALAMATHS
INCLUSION OF PLOT NUMBERS TO DEPICT THE PLOT NUMBER AT EACH PLOT IT NEEDS TO GENERATE THE CENTROID OF EACH PLOT FROM THE AREA LAYER OF THE DIGITIZED DATA. ANY GIS TOOL MAY BE USED FOR THIS INCLUSION. UNICODE FONT MAY BE USED TO GET THE PLOT NUMBERS IN THE FORM OF LOCAL LANGUAGE.
Realisation of NLRMP vision- status of WB All 222 out of 237 Registration offices computerised where registration is completed on the same day using CORD & DOCUNIC software developed by NIC Sri Asim Dasgupta, Finance Minister inaugurating Srirampur office
Realisation of NLRMP vision- status of WB continued….. Formar Finance Secretary Sri Samar Ghosh inaugurating Janai Office
Realisation of NLRMP vision- status of WB continued…. All 341 Block Land offices are computerised where computerised certified ROR, plot information service provided Data sharing and process re-engineering between two departments (L&LR and Finance ) has been finalized to automate mutation on registration NIC started developing the software to integrate BHUCHITRA with CORD to provide single window mutation service to citizen
Benefits of Integration of digitized map with R-O-R data Providing BhuChitra to the public in A-4 size paper. To study various aspects of R-O-R and map data like extraction of plot area, area under Barga cultivation, Govt. lands, agriculture, water bodies, etc. Useful in rectifying the discrepancies that may exist for a particular plot area in the R-O-R and map by ground truthing.
ACHIEVEMENTS Till date out of 68321 maps 45,079 maps digitized. Updation of land records completed in 69 Blocks & in progress in 40 Blocks Integration of digitised maps and ROR data completed for 44500 sheets Service of BHUCHITRA launched for the public.