Topographic Correction
- Author: O.Conrad (c) 2008
- Menu: Imagery | Tools
Description
Topographic correction tools for satellite imagery using a digital elevation model (DEM) and the position of the Sun at acquisition time to estimate and remove shading effects.
References
- Civco, D. L. (1989): Topographic Normalization of Landsat Thematic Mapper Digital Imagery. Photogrammetric Engineering and Remote Sensing, 55(9), pp.1303-1309.
- Law, K.H., Nichol, J. (2004): Topographic Correction for Differential Illumination Effects on Ikonos Satellite Imagery. ISPRS 2004 International Society for Photogrammetry and Remote Sensing. http://www.cartesia.org/geodoc/isprs2004/comm3/papers/347.pdf.
- Phua, M.-H., Saito, H. (2003): Estimation of biomass of a mountainous tropical forest using Landsat TM data. Canadian Journal of Remote Sensing, 29(4), pp.429-440.
- Riano, D., Chuvieco, E. Salas, J., Aguado, I. (2003): Assessment of Different Topographic Corrections in Landsat-TM Data for Mapping Vegetation Types. IEEE Transactions on Geoscience and Remote Sensing, 41(5), pp.1056-1061. http://www.geogra.uah.es/~emilio/pdf/Riano2003b.pdf.
- Teillet, P.M., Guindon, B., Goodenough, D.G. (1982): On the slope-aspect correction of multispectral scanner data. Canadian Journal of Remote Sensing, 8(2), pp.1537-1540.
Parameters
| Name | Type | Identifier | Description | Constraints | |
|---|---|---|---|---|---|
| Input | Elevation | grid, input | DEM | - | - |
| Bands | grid list, input | BANDS | - | - | |
| Output | Corrected Bands | grid list, output | CORRECTED | - | - |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Grid system | grid system | DEM_GRIDSYSTEM | - | - | |
| Azimuth | floating point number | AZIMUTH | direction of sun (degree, clockwise from North) | Minimum: 0.000000 Maximum: 360.000000 Default: 180.000000 | |
| Height | floating point number | HEIGHT | height of sun above horizon (degree) | Minimum: 0.000000 Maximum: 90.000000 Default: 45.000000 | |
| Method | choice | METHOD | - | Available Choices: [0] Cosine Correction (Teillet et al. 1982) [1] Cosine Correction (Civco 1989) [2] Minnaert Correction [3] Minnaert Correction with Slope (Riano et al. 2003) [4] Minnaert Correction with Slope (Law & Nichol 2004) [5] C Correction [6] Normalization (after Civco, modified by Law & Nichol) Default: 2 | |
| Minnaert Correction | floating point number | MINNAERT | - | Minimum: 0.000000 Maximum: 1.000000 Default: 0.500000 | |
| Maximum Number of Cells | integer number | MAXCELLS | Maximum number of grid cells used for trend analysis as required by C correction. | Minimum: 1000 Default: 100000 | |
| Limit Value Range | boolean | LIMIT | Avoid over and undershootings specifying value range limits. | Default: 0 | |
| Minimum | floating point number | LIMIT_MIN | - | Default: 1.000000 | |
| Maximum | floating point number | LIMIT_MAX | - | Default: 255.000000 |
Command Line
Usage: saga_cmd imagery_tools 19 [-DEM] [-BANDS ] [-CORRECTED ] [-AZIMUTH ] [-HEIGHT ] [-METHOD ] [-MINNAERT ] [-MAXCELLS ] [-LIMIT ] [-LIMIT_MIN ] [-LIMIT_MAX ] -DEM: Elevation grid, input -BANDS: Bands grid list, input -CORRECTED: Corrected Bands grid list, output -AZIMUTH: Azimuth floating point number Minimum: 0.000000 Maximum: 360.000000 Default: 180.000000 -HEIGHT: Height floating point number Minimum: 0.000000 Maximum: 90.000000 Default: 45.000000 -METHOD: Method choice Available Choices: [0] Cosine Correction (Teillet et al. 1982) [1] Cosine Correction (Civco 1989) [2] Minnaert Correction [3] Minnaert Correction with Slope (Riano et al. 2003) [4] Minnaert Correction with Slope (Law & Nichol 2004) [5] C Correction [6] Normalization (after Civco, modified by Law & Nichol) Default: 2 -MINNAERT: Minnaert Correction floating point number Minimum: 0.000000 Maximum: 1.000000 Default: 0.500000 -MAXCELLS: Maximum Number of Cells integer number Minimum: 1000 Default: 100000 -LIMIT: Limit Value Range boolean Default: 0 -LIMIT_MIN: Minimum floating point number Default: 1.000000 -LIMIT_MAX: Maximum floating point number Default: 255.000000