The main focus of Geoscience under Remote Sensing and GIS (application areas) is to cater the need of the NE Region by using core Geological knowledge in combination with latest technology. And also to provide professional training, inputs and support to state (user) departments dealing with Geo-sciences applications, such as mineral exploration, engineering geological survey for tunnels and dams, road alignment, GNSS Surveying and groundwater exploration etc. Number of research and operational projects in different fields of geological sciences have successfully executed & completed. It has also completed no. of user specific projects of various state & central government organization. The thrust areas includes Landslide, Environmental Hazards, Mine Mapping, Ground Water, Road alignment, Active Tectonic and Crustal Deformation, Earthquake Precursors, SAR interferometry, hyperspectral and thermal image analysis.

National Mission Participation

Involved in various national projects of societal importance initiated by ISRO/DOS. Few of the completed projects are:

• Landslide hazard zonation along Shillong-Silchar-Aizawl National Highway Corridor
• Groundwater Prospects Mapping
• National Geomorphology and Lineament Mapping (NGLM)
• Seasonal Landslide Inventory Mapping (SLIM),
• Groundwater Quality Mapping -under national rural drinking water mission

Monitoring and Evaluation of IWMP Watersheds

The project envisages monitoring and evaluation of IWMP projects using Bhuvan web services and Mobile app for the sanctioned projects from 2009-10 to 2014- 15 (This may differ State to State) for entire India and NESAC is carrying out the project for North Eastern part of India. Each project has to be monitored for a period of 5 years from the date of implementation. The project is being implemented at NRSC and geo spatial tools have been developed (Srishti – a web GIS interface on Bhuvan and Drishti – a mobile based android application). The project duration is up to 2020. The scope of the work of this project include Processing of high resolution satellite data – LISS-IV and Cartosat; Correction / fine tuning of Watershed boundaries based on SIS-DP database; Generation of LULC maps, NDVI, evaluation and assessment based on Drishti photographs , preparation of maps showing change detection in projects supported by limited ground truth of representative sites. The approach includes report generation for each project area year wise in suggested format. NESAC is carrying out following activities in collaboration with State Remote Sensing Application Centers of NER:

  • Processing of high resolution satellite data- LISS IV and Cartosat.
  • Correction/ fine tuning of watershed boundaries based on SIS-DP Satellite Image.
  • Generation of LULC maps, NDVI, evaluation and assessment based on Dristi photographs, change detections maps coupled with ground truth as well as year wise report generation for each project area.
  • All the processed data will be made available for online analysis/interpretation.

User Support

Provides supports & guidance to government departments, NGOs on requirements of space technology inputs in their respective planning and developmental activities. It actively carries out user specific projects based on the requirement. Some of the user projects are:

• Hazard Risk Vulnerability Assessment (HRVA) Guwahati City, Silchar, Dibrugarh Towns and Dhemaji District, Assam
• Road Alignment Planning from Dumro to Same Basti, Upper Siang and Lower Dibang Valley Districts, Arunachal Pradesh
• Landslide Hazard Zonation and reservoir rim stability studies for SLP, Arunachal Pradesh
• Feasibility study for a proposed bridge across Lohit River near Dhola, Assam
• Geospatial inputs for development of Meghalaya Zoo near Umtru River, Ri-Bhoi District, Meghalaya

In-House

Actively engaged in R & D and Technology Demonstration projects as an in-house activities in order to achieve indebt knowledge and understand various requirements where space technology can be effectively utilized for societal benefits. Some of the important activities are highlighted below:

• Road network gap assessment and alignment for new roads in Ri-Bhoi district, Meghalaya (Completed)
• Heavy metal Contamination in Coal Mining areas of Jaintia Hills District, Meghalaya – A Remote Sensing and GIS Perspective (Ongoing)
• GPS based TEC for Earthquake Precursor for understanding Seismicity in Shillong Plateau(Ongoing)
• Active fault mapping for identification of potential deformation zones in NER (Ongoing).

Future Initiatives

Looking forward to study various other aspects of space technology applications that may utilized as an essential inputs in disaster mitigation planning. Some of the proposed activities are as follows:

• Development of cost effective sensors to generate site specific early warning of Landslide(s)
• Active tectonics and Crustal deformation study in NER
• Landslide Susceptibility Mapping for development of Rainfall Induced Landslide Early Warning System (LEWS) in NER
• Industrial hazard assessment for offsite emergency planning & management of major accident hazard (MAH) units in NER.

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