Spatial data sets in hydrology project
Selection of GIS Data Sets
The selection of minimum GIS data sets will be guided by the relevance and commonality to both the surface and groundwater components of HP. Surface water analysis requires a minimum set of thematic data on land use, soil, topography and drainage, while ground water analysis will additionally require spatial data on geology (lithology/ rock type and structure) and geomorphology. General supporting data cover settlements, transport network and administrative boundaries. This only constitutes a minimum spatial data set, considering the time and manpower constraints. For example, data on irrigation command areas, canal network and other water use sectors such as industries, though useful, will be difficult to generate within the balance period of HP.
The suggested themes in
1:50,000 scale are: land use/cover (including surface water), soil,
geology (lithology/rock type and structure) and geomorphology (to be
derived from satellite data), and drainage patterns, settlements, contours
and spot heights, and transportation network from the most current Survey
of India topographic maps (Fig 2). It is envisaged that a minimum data set
will be augmented by additional spatial data sets in the course of time,
to meet fresh analysis requirements.
Inventory of Existing Spatial Data Sets and Fresh Generation Requirements
The extent of fresh data generation requirements will be assessed based on the inventory of existing data sets in map and digital format, generated under national and State programmes. The existing data sets will be reviewed under a set of standard criteria (thematic classification scheme, mapping and thematic accuracy, age of data and availability) for acceptance in HP. Additional fresh generation of data sets (thematic mapping and digitization, digitization of existing maps and format conversion of existing digital data sets) will be defined for each state. The preparation of these data sets will be as per the standard methodology proposed by HP, to ensure consistency and uniformity amongst the participating States.
A High Level Technical Group (HLTG) will approve the selection of primary themes and classification schemes, methodology manual, bidding procedure and document, and integration of GIS data sets into National and State Data Centres. The State Level Committee may have representatives from the State Ground Water Department, Surface Water Agency, Central Water Commission, CGWB, Survey of India, GSI and the State Remote Sensing Centre. The Committee will support the State GWD in conducting the inventory of existing GIS data sets, defining fresh data generation requirements, external quality audit of data products, and integration of GIS data sets into the State Data Centre.
Standard Methodology for Generating Data Sets
The methodology will cover i) fresh thematic data generation, ii) digital conversion of fresh and existing thematic maps and select details from SOI maps, and iii) format conversion of existing digital data set.
It is proposed to procure services from a large number of vendors in the preparation of spatial data sets. The manual provides technical guidelines for preparation of uniform and consistent spatial data sets by multiple vendors, by standardizing the methodology and input and output products.
The manual provides an overview of spatial data sets: selected themes, input data, output data and generation methodology, and the spatial database organization (including map tiles and TIC mark Ids) and data specifications in regard to scale, map projection, digitization accuracy, and registration accuracy between layers. Theme-wise chapters cover the classification scheme, input data specifications, methodology flowchart, feature coding standards, output file naming convention, internal QC and external QA, and specifications for deliverable products.
Annexures of the manual describe how the classification and map accuracy is estimated, the standard procedure for digitization, the internal quality control and external quality audit procedure, and provide details of the report accompanying each digital map tile including the QC/QA statement (map tile code, generation date, mapping accuracy, thematic accuracy, and digitization accuracy); brief description of input data, generation procedure, and output products; and contact address in vendors office for future follow-up.
Procedure for Generating Data Sets
The Ground Water department of each participating State will be responsible for generating data sets within the State. The data sets will be produced through outsourcing to vendors through a competitive bidding procedure.
A State Level Technical Committee consisting of representatives from the State surface and ground water agencies, Central Water Commission and Central Ground Water Board will support the State GWD. It is recommended to include the Geological Survey of India (GSI) for i) technical inputs on geology related themes and ii) to facilitate procurement of data sets from the National Geoscientific Data Centre developed under GSI-BRGM Project. The Technical Committee will provide guidance and support on defining fresh spatial data generation, external independent quality audit of data products and integration of spatial data sets into the State Surface and Groundwater Data Centres.
The HLTG will oversee all the generic aspects such as selection of minimum GIS data sets, standard methodology to be followed, bidding procedure including vendor qualification by appropriate weighting, and integration of GIS data sets into the State and National Data Centres.
Inventory of Existing Spatial Data Sets and Fresh Generation Requirements
The extent of fresh data generation requirements will be assessed based on the inventory of existing data sets in map and digital format, generated under national and State programmes. The existing data sets will be reviewed under a set of standard criteria (thematic classification scheme, mapping and thematic accuracy, age of data and availability) for acceptance in HP. Additional fresh generation of data sets (thematic mapping and digitization, digitization of existing maps and format conversion of existing digital data sets) will be defined for each state. The preparation of these data sets will be as per the standard methodology proposed by HP, to ensure consistency and uniformity amongst the participating States.
A High Level Technical Group (HLTG) will approve the selection of primary themes and classification schemes, methodology manual, bidding procedure and document, and integration of GIS data sets into National and State Data Centres. The State Level Committee may have representatives from the State Ground Water Department, Surface Water Agency, Central Water Commission, CGWB, Survey of India, GSI and the State Remote Sensing Centre. The Committee will support the State GWD in conducting the inventory of existing GIS data sets, defining fresh data generation requirements, external quality audit of data products, and integration of GIS data sets into the State Data Centre.
Standard Methodology for Generating Data Sets
The methodology will cover i) fresh thematic data generation, ii) digital conversion of fresh and existing thematic maps and select details from SOI maps, and iii) format conversion of existing digital data set.
It is proposed to procure services from a large number of vendors in the preparation of spatial data sets. The manual provides technical guidelines for preparation of uniform and consistent spatial data sets by multiple vendors, by standardizing the methodology and input and output products.