Erdas Imagine Case Study

India’s State of West Bengal is the largest producer of fish and fish products in the country, covering more than 20 million impounded water bodies. In addition, there are open water resources from rivers, canals, streams, tributaries, etc. within a geographical area of about 88,000 square kilometres. The Department of Fisheries helps manage the state’s increasing demand for fish by focusing on fish production using its existing water resources; and provides micro-financing services to encourage alternate livelihood for fishermen.

The Department required an exhaustive inventory and spatial database of its infrastructure and assets using high-resolution satellite imagery and storing it in a single, centralised system accessible by district fisheries officials and other departments. All spatial information would be web-hosted to help office personnel access information on-the-fly.

West Bengal Fisheries – Key benefits of Hexagon Geospatial Solution

The Mapping Office at the Department of Fisheries has created detailed inventory of all water bodies using GeoMedia®, and ERDAS IMAGINE®. This inventory includes information such as surface water type (perennial or seasonal / rain-fed, natural, or manmade), type of water body, usage, co-relation with revenue records, roads (metalled and non-metalled) and railway network, habitation in clusters, fishery cooperative societies, and other places of importance in different layers.

ERDAS APOLLO® for imagery management and web-publishing that also facilitates vector-editing on the web was also deployed at the Department. The new consolidated geospatial database manages 20 terabytes of raster data (raw and processed images) and about 01 terabyte of vector data.

This central GIS database is the first of its kind in India in terms of large-scale mapping using high-resolution satellite imagery data, prompting other states to implement similar projects. The Mapping Office plans to capture sea-fishing areas in the Bay of Bengal and coastline, mark national and international waters, and provide real-time tracking of fishing boats on the sea in addition to the ongoing work for real-time updates to GIS-based digital maps and databases.

Read/download the full case study here.



ERDAS IMAGINE - Land & Property Services

 

Land and Property Services use IMAGINE to detect rock features for the Department of Agriculture and Rural Development

 

Background of LPS and DARD
Land and Property Services (LPS) are responsible for a number of areas including; collection and administration of rates, reliefs and benefits, providing a valuation for all rateable properties in Northern Ireland, producing a range of paper and digital Ordnance Survey Northern Ireland products, maintaining the land registry. The Department of Agriculture and Rural Development (DARD) aims to promote sustainable economic growth and development of the countryside.

 

Project Objective
DARD are responsible for EU farm payments for land owners, however these payments are dependent on land surface type. Rocks, scree and shale covered areas cannot be included in land area calculations when processing these payments. The objective is to classify these rock/stone areas, known as ineligible features, and extract these areas from the grant calculations. 

 

Overview of ERDAS IMAGINE
ERDAS IMAGINE is a suite of software for creating, visualising, geocorrecting, reprojecting and compressing geospatial data. IMAGINE combines remote sensing, photogrammetry and radar into a single product. 

The LPS use ERDAS IMAGINE to detect ineligible features in common areas (upland fields which are owned by more than one farmer) by analysing the colour infrared imagery provided by LPS. IMAGINE creates NDVI models from the NIR and Red bands.
 

Overcoming Challenges
Previously LPS viewed and classified the rocky areas off 40cm ortho imagery. Reclassification was then processed using a different desktop application, mosaicking 16 tiles into 1 sheet output. IMAGINE has the ability to mosaic quickly, reducing the number of steps in this process. LPS utilised the Spatial Modeller in IMAGINE, using criteria based statements, to carry out this process.

In addition, some images/tiles had different shading. IMGAINE pan-sharpen functionality processed and matched the shading across all tiles.


Realising Results
LPS were successfully able to identity ineligible areas and we able to run the entire process, including reclassification, using IMAGINE’s Spatial Modeller software. In addition, the predefined process they worked on can be applied to other areas if required.


Moving Forward
In the future, LPS will be able to reproduce this process for the feature creation using the 4 band imagery for other projects.

Irish Mapping and GIS Solutions (IMGS)
We are Ireland's leading supplier of spatial solutions for government, utility and telecommunications industries. Our solutions are built on our partner's technology platforms and enable organisations to Survey, Visualise, and Integrate spatial data into their enterprise information systems. 

We believe that the key to our success is our focus on customer's needs and delivering solutions to meet those needs. We believe that delivering the solution is just the beginning and carries very little value if not backed by top class support.

 

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