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Geodata Overlay Viewer (GOVu): An innovative way to handle high-resolution imagery
Tiling Tab: In the third tab, the user can specify the number of tiles to be created from the selected export area and the file naming convention to be used for the exported image tiles. This feature enables exporting different parts of the image. The number of exported files will be equal to the number of tiles.
- The user can export an area by tiling it into a maximum of 2500 individual image tiles.
- The area of each exported image tile is specified on the top left corner of the window.
- After cutting the image into multiple tiles, the user can select one or more tiles for eventual export. To select all tiles for export, there is an option to select all. Otherwise the user can select or deselect a tile by pressing shift and clicking on that tile.
- The export window also displays the amount of memory needed to export the selected area and the free memory available at the bottom of the Export dialog box.
- When the user has made his selections for export, the selected tiles are exported by clicking on the GO button.
- When the export process commences, a dialog box appears which indicates the status of the export
- progress, the exported file name and the estimated time left for completion.
- If the export file which is to be created already exists at that location, then the systems asks for a confirmation to overwrite the existing file. The user also has the option to cancel the export in between by clicking on the cancel button.
Featuring GoVu:
- Goviewer is a “viewer” for viewing compressed data formats like MrSID, ECW. It provides easy and fast access to aerial photographs. The viewer is also able to load vector data (.tab, .shp , .dxf) formats over the aerial image.
- It has a special functionality of overlaying imagery of the same area taken at different time periods vintages and blend them. It has a Print Preview that allows the user to print customized print templates. The Quality of the data is maintained while zooming of data.
- The most important feature of the GOViewer is its user-friendliness and ease-of-use.
- The object-based component architecture based on n-tier architecture enables customization and extensibility of the basic system.
- WYSWYG print: Includes creating and saving of print template, adding text and bmp to the print
- Browser like Back and Forward features
- Slider based zooming with beautiful graphics effects
- Tiling and exporting of images into jpeg, tiff, bmp and geotiff formats
- Measuring tool for calculating distance, area and perimeters etc.
- Overlaying of shape files over the Raster image.
- Many other features like Lens, Telescope, Gazetteer, Snapshot, Grid etc.
Technology:
The Geodata Overlay Viewer is built using MFC classes without any support of outside controls. However MrSID and ECW 2 decompression SDKs are used for image rendering and libraries are used for export and vector overlays.
Supported Formats:
ECW and MrSID formats are encrypted inside .gov format. The .gov format can be created with a tool called GOMaker (included with the application). The proprietary .gov files consist of a compressed MrSID or ECW image, an index map as a bitmap (*.bmp) and metadata for the image.
Recommended System Requirements:
Operating System: Microsoft Windows 98/NT Workstation with Service Pack 6
Processor: Intel Pentium III
RAM: 256 MB
Hard Disk Space: 25 MB
Further business prospects/Conclusions:
- Goviewer can be used as a hosted service, which can provide online access to the highest resolution, most up to date archive of Aerial photography.
- Download AOI revealed imagery into the desktop GIS Project
- Saving time, cost and no hassle in locating AOI image
- No waiting time required for delivery
- Managing Large image files/volumes
Acknowledgements:
The author would like to thank Mr. Pavitra Aggarwal, Leena, Gurvinder and Farid for their wonderful contribution while developing the viewer, without their support it would had not been possible to accomplish this task.
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