Land Administration for Nagpur Municipal Corporation
The Nagpur Municipal Council (NMC) was established in 1864, with a population of 82,000 and a jurisdictional area of 15.5 sq. km, which was expanded to 227.37 sq. km as per the Government Resolution dated 14th May 2013.
The key responsibility for providing Nagpur’s citizens basic urban services lies with the NMC, including water supply, sewerage, waste management, slum improvement, land use planning, construction and maintenance of internal roads, street lighting, maintenance of parks and gardens, providing primary health and education facilities, etc. NMC coordinates with various other government organizations like NIT, MHADA, MSRTC, the Traffic Police, MPCB, etc. for delivering these basic urban services.
It was soon identified that there was a need to link resource mobilization with spatial development planning focusing on credit enhancement mechanisms. This made the preparation of land use maps the first step towards city development.
NMC assigned this task to IIC Technologies, India, based on the competitive merits for the preparation of the Development Plan as per MRTP Act 1966 for the NMC Area.
The main objective of the project was to develop a detailed GIS Base map on a scale of 1:1,000 for the entire NMC area in stereo mode. All features like Buildings, Vacant Plots, Roads (National Highways, State Highways, City Roads and Streets), Bridges (Flyovers, Railway Bridges, etc.), Railway Tracks, Parks, Gardens, Stadiums, Slums, Traffic Squares, Water Bodies (Reservoirs, River, Lake, Pond, Drainage, Canal etc), Over Head Tanks, etc. to be extracted from Aerial imagery through stereo mode.
Scope of work
The project involved Desktop study, establishing a precise Ground Control Network using Dual frequency GNSS/GPS in relative static positioning method, Digital Aerial Photography ≤ 10cm GSD using fixed wing Aircraft, Geo referencing & Creation of DEM, Contour generation and \Ortho Photo, Geo-Referenced Existing Land Use Map, Geo-referenced Land Records System, Development & installation of EGIS system, Creation of Base map for entire NMC and Training.
Data collected during the preparation of the Base map was used for planning purposes of all infrastructure projects for NMC and other government departments. Maps/ data set/ information was prepared for existing Utilities (such as Road, Railway, HT & LT Power lines, OFC cable etc.) or existing water bodies, existing structures, slums, religious structures, industrial areas, the height of structures etc.
The collected data was also used for slope analysis and finding out the catchment area of a given location/ spot/ village/ river etc. with the help of 0.5m contours and a Digital Elevation Model (DEM) generated. It was also useful for analysis of structure density, type of structures, use of structure, the area under the structure as per its use area under defence, industry etc. The ground surveys and collected attribute information were linked to the Final Base Map to create a comprehensive GIS database.
The Generation of Spatial Database Infrastructure includes the Inception Report, Ground Control Network (.shp), Aerial Imagery (Geo Tiff), Geo referencing & Creation of DEM \ Ortho Photo for the entire NMC region, Index Plan, Key Plan on 1:50,000 Scale, Detailed Survey Plan on 1:5000 Scale, Existing Land Use Plan on 1:5000 Scale, Existing Land Use Report, Geo-Referenced Existing Land Use Map & Report, Geo-referenced Land Records System, Base map for entire NMC region, Development & installation of GIS software, All created Maps and Training.
Geo Referencing, DEM creation, Contours, Ortho-Photo generation
Geo Referencing: All distributed ground controls used for Geo referencing of Aerial imagery, made with polynomial order 2 with suitable transformation method.
DEM Compilation: All photogrammetric Digital Elevation Model (DEM) collection was carried out using Z/I ImageStation to meet the ortho photo standards. IIC converted the final DEM (after the QA/QC steps) into 3D ASCII XYZ format. Cell sizes were 20m for 10m for rural and urban respectively.
Generation of Contours: High-accuracy contours generated at 5m were thoroughly checked and corrected with the help of DTM/TIN.
Surface/DEM Generation: Surface generated using final DTM used for orthophoto and DEM generation.
Pre-Processing: Project setup to be done to define coordinate system information, rotation angle, ISPM project and its Orthorectification settings, seamlines, mosaic parameters etc.
Orthorectification: Performed to correct relief and tilt errors. Outputs from this task are ortho-photographs.
Feature Extraction: Digital Aerial imagery analysed under high zoom to identify features listed in the data model using heads on digitization technique. All features are extracted from imagery through the on-screen / Heads-on digitization technique.
Digitization: Data capturing is carried out by attaching input imagery from the server as a reference in the CAD environment. Base Map in Geodatabase.
About the NMC EGIS Geo Portal Solution
The respective department’s surveyed datasets are made available to internal and external stakeholders of NMC through the EGIS GeoPortal Solution via Web, Mobile, and Tablets Access.
Detailed Technical Architecture Diagram for NAGPUR GIS web-enabled Geo Portal
The above diagram depicts the overall proposed logical technical Solution architecture for NMC EGIS web-enabled GeoPortal System with Mobile Client access. It displays accurate Surveyed outputs in various Spatial layers and supports Integrations with current IT systems, Data and Spatial systems in the scope of the EGIS Project.
Layer 1: Outputs of all approved spatial surveyed datasets, collection of any/all spatial datasets, access to documents from servers, integration of existing Systems in NMC with integration to both spatial and non-spatial information of respective land systems.
Layer 2: Application Data and Integration Layer – usage of verified Spatial Data files and approved for usage in the geoportal solution.
Layer 3: Data Storage Layer – centralized distributed storage where PostgreSQL PostGIS RDBMS server is proposed to be used for storing both spatial and non-spatial data and the centralized file storage server.
Layer 4: Data Analytics Layer – static and dynamic report generation and dynamic dashboard with statistical computations as needed for the Nagpur NMC EGIS Geo Portal Solution.
Layer 5: Business Layer – Geospatial server and QGIS server-side computational layer. Both spatial and non-spatial functionality like User, Roles, Security single sign-on, spatial layers access, OGC compliant access of attributes, etc. is supported in this server-side layer.
Layer 6 and Layer 7: Presentation Actual UI Access Layers. Users can log in, query and retrieve the respective datasets from the catalogue for spatial and non-spatial views, and export the dataset into required formats where needed.
Indicative NMC EGIS Geoportal Screen showing the list of Illegal Constructions in selected AOI
- Pre-Flight Panelling: Performed to save time and costs of aerial mapping and surveying for saving time and costs. Panels visible in photographs were reduced, runtime errors nullified, and nearly 100% accurate datasets and permanent markers were obtained.
- Ground Control Points: Obtaining GCPs usually consumes a lot of time, affecting final project delivery. A simplified technique was used instead for establishing GCPs in project areas while obtaining permissions.
- Base Map Preparation: Tasks and requests with NMC’s requirements kept in mind, rather than creating a generic Base map.
- Tool Development: The focus was on the automation of work and avoiding manual errors. Data Migration played an important role in transferring data into the Database.
- Auto Migration of data into the database
- Auto QC using spatial tools
- Robust Architecture: Focus on website efficiency. A highly scalable and reliable web portal was established that was flexible, and easily integrable with third-party.
- Knowledge Transfer: Multiple levels of knowledge transfer to NMC staff are conducted for better understanding of the usage and process of the application, making them become self-sustainable.
- Project Management: Tools developed to monitor the online progress of the application using Mobile application for easy navigation access by citizens as well.
