In SuperMap, the grid data contains two parts: grid dataset (GRID) and image dataset (IMAGE). The former is usually used in grid analysis and the later is used to display or as maps. SuperMap provides multiple pixel formats because of the complex forms. Users can select the appropriate pixel format to operate according to the work actual needs.
Grid Dataset Pixel Format
| Pixel Format | Format | Description |
|---|---|---|
| 1 bit | The range is [0,1]. If there is no value, the default is 0. In some cases the default is 1 or -9999. | |
| 4 bits | Bit | The range is [0,1]. If there is no value, the default is 0. In some cases the default is 15 or -9999. |
| 8 bits (single byte) | Byte | The range is [0,1]. If there is no value, the default is 0. In some cases the default is 255 or -9999. |
| 16 bits (double byte) | TByte | The range is [-2e+15, 2e+15-1]. If there is no value, the default is -9999. |
| 24 bits (three byte) | The range is [-2e+23, 2e+23-1]. If there is no value, the default is -9999. | |
| 32 bits (Int) | Int | The range is [-2e+31, 2e+31-1]. If there is no value, the default is -9999. |
| 64 bits (Long) | Long | The range is [-2e+63, 2e+63-1]. If there is no value, the default is -9999. |
| Single-precision float | Float | The range is [-2e+31, 2e+31-1]. If there is no value, the default is -9999. |
| Double-precision float | Double | The range is [-2e+64, 2e+64-1]. If there is no value, the default is -9999. |
The Pixel Format of image dataset
| Pixel Format | Format | Description |
|---|---|---|
| monochrome | It can represents black and white. | |
| 16 | Bit | It can represents 16 colors. These colors are index color and can be defined in the color table. |
| 256 | Byte | It can represents 256 gradual colors. These colors are index color and can be defined in the color table. |
| color | TByte | Each pixel is represented by 16 bits. Red, green and blue each is represented in 5 bits and 1 bit is not used. |
| true color | RGB | Each pixel is represented by 24 bits. Red, green and blue each is represented in 8 bits |
| Enhance true color | RGBA | Each pixel is represented by 32 bits. Red, green, blue and alpha each is represented in 8 bits and It doesn’t support multiple images. |