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A State mosaic ready referral system
Design & Development Aspects
The software was developed using 'Java' to make it platform independent and web based. This web based software with all support files occupies maximum of 4MB disk space. All the image files and Information files are stored in compressed mode and encrypted ASCII format respectively for better data security, disk space management and to make the software more compact and faster. Image files size is restricted to 400 X 400 X 3 pixels so that users with lower PC versions can also be able to use it. This Utility can be better accessed with Netscape Navigator version 4.5 and above. The boundary information provided in this software is extracted from SOI generated state and district boundaries and 1:1 Million SOI maps etc. By placing this utility in NRSA website we wish to make the NRSA user community aware of the value added services provided by NRSA and have a ready referral of the same with the use of internet. Apart from state mosaic visual images it also provides other facilities like Geographic, Topographic and IRS scene information based on the place selection. Optimal scene coverage of selected state can also be viewed based on online sensor selection. As it provides most of the geographic information it is treated as Internet based GIS facility. Operational Aspects Iinvoking this utility the web based window with India image and neccesary information and query items will be displayed (ref. Fig. 1). The image information such as mission details, period of the data acquisition and scale of the data archived are provided in the "Scene information" block. Iinformation like number of states and union terrerories and spread of DOS centres, RRSSC centres and State remote sensing centres are also shown in "Country Information" block. On selection of any of the centres the location of the same can be seen in the image. "Mouse pointer info" block provides 1: 1 Million toposheet Id with State name and Capital over valid Indian region. State of interest can be selected either by mouse click or from list box provided. The overlays avaliable at country level are shown in the overlays list box. Multiple overlay selection option is also provided. Based on selected overlays the same will be overlaid on the image(ref. Fig. 2). Prominent places of Indian region are listed in the places list. On selection of a place from the list box location of that place will be marked on the India mosaic and geographic information of the same is shown. Package information can be viewed in detailed by using 'Package Information' button.  Fig 1 : Main menu  Fig 2 : India Mosaic with overlays and Information Once the state is selected state mosaic image of the same will be displayed along with required information and queries. Scene, State, Mouse Pointer information and Mouse Click information are shown in the left side column and the query boxes are provided in the right side column(ref. Fig. 3). State Capital and number of districts of the state, RRSSC centre availabililty and State remote sensing Centre are shown in "State information" block. On selection of capital, RRSSC or RS Centre the location of the same will be marked on the state image. Mouse movement provides 1:250,000 Toposheet Id with district name and Head quarters. Mouse Click provides Geographic coordinates, toposheet covered and selected IRS scene coverage of the mouse pointer position in "Mouse Click Info" block. Once the Mouse pointer is kept on the Head Quarter position, District and Head quarter names are shown in "Mouse Pointer Info" block. The overlays provided at state level are district boundaries, district head quarters and 1: 250,000 grid coverage. On selection all or some of the overlays can be seen over state image(ref. Fig. 4).  Fig 3 : State Mosaic with District & Head Quarters Overlays  Fig 4 : State Mosaic with toposheet Grid & District Head Quarters Overlays More than one overlays provided can be selected from the list box. Using Place selection option places covered in the selected state can be listed and position of the selected place can be viewed on the state image. By clicking the mouse on the place position the geographic coordinates, toposheet covered and IRS scene coverage can also be viewed in "Mouse Click Info" block. On line help facility is also provided. |