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A State mosaic ready referral system
Algorithms Used :
Inside & Outside Test : "Inside and Outside test" algorithm is used for the estimation of Scene coverage of a particular state.
Transformation: Online geographic coordinate information was provided from the cursor coordinates using coordinate transformations like affine and perspective based on extent.
Applications:
This software has been extensively used in NRSA during the State Mosaic products generation for most of the Indian states from time to time. The database archived increased the throughput substantially. It can be accessed by the users through Internet and get most of the information of Indian region using various options provided. This software is being used effectively by applications scientists in their work estimation of various fields like land use, forestry, water resources management etc.
Conclusion:
The software can be used as tool in NSDI project where other product types like merged and WiFS data products were planned to be stored. This database created for this utility can be included in NSDI project. Whenever new states are formed database can be updated. Recent state formations like Uttanchal, Jarkhand and Chhattisgarh have also been updated. It can be further extended to District mosaic products (using LISS-III data) based on users response. The satellites supported are all IRS series and LANDSAT-5-TM. The scene details provided are based on the referencing schemes of the satellites, which will be correct under ideal conditions of the orbital elements. However there may be minor variations due to day to day changes in orbital position of the satellite.
References:
- Index Map and 1:1 Million scale state maps published by Survey of India.
- Digital Image warping by Dr. George Woolberg.
- Interactive Computer Graphics by Stevens.
- Handbook of IRS-1C published by NDC, NRSA.
Acknowledgements:
We are very much thankful to Dr. R. R. Navalgund, Director, NRSA for approval and encouragement in developing this package. Our sincere thanks go to Sri A.S. Manjunath, GD(SP & QE) & Mr. D.S. Jain, Head IS&SPD for their valuable suggestions as and when needed. Our special thanks goes to Mr. Y. Chandra Sekhar who provided software development support as and when required. We are thankful to Mr.Y.V.Suryanarayana and Mr.D.Srinivas of IS&SPD for providing administrative boundaries of the states and carrying out the internal software evaluation.
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