Raster Data
What is Raster Data?
Raster data represent real world data, within the GIS environment. Its consists of a matrix of cells (pixels) organized into rows and columns (grid) where each cell contains a value representing information. Raster database represents continuous data such as Elevation, Slope, Surface.
Raster Database are Digital Aerial Photographs, Satellites imagery, Digital pictures, or even scanned Maps.
- Grid and cells
- For continuous data such as elevation, slope, surfaces
Raster File Formats
| File Formats | Full Form |
|---|---|
| BMP | Bit Map Image |
| ECW | Enhanced Compression Wavelet |
| JPEG (JPG) | Joint Photographic Experts Group |
| PCX | Personal Computer Exchange |
| PNG | Portable Network Graphics |
| TIFF | Tagged Image File Format |
| GIF | Graphics Interchange Format |
| PICT | Image Originator Apple Computer |
| RLC | Run Length Compressed |
| IGS | Image in Grayscale |
| GEOSPOT | Spot Image Corp.(Georeferenced Image) |
| GEOTIFF | Georeferenced Tiff Image |
| MRSID | Multiresolution Seamless Image Database |
| Exif | Exchangeable Image File Format |
| PSD | Adobe PhotoShop Document |
| ADRG | Arc Digitized Raster Graphics |
| SDTS | Spatial Data Transfer Standard |
| IMG | Erdas Imagine Image |
| CALS | Computer-aided Acquisition Logistics and support |
| TGA (TARGA) | A Simple run length encoded image format |