Tool IMCORR - Feature Tracking
The tool performs an image correlation based on two raster data sets. Additionally, two DTMs can be given and used to optain 3D displacement vectors.
This is a SAGA implementation of the standalone IMCORR software provided by the National Snow and Ice Data Center in Boulder, Colorado / US.
References
- Fahnestock, M. A., Scambos, T. A., and Bindschadler, R. A. (1992): Semi-automated ice velocity determination from satellite imagery. Eos, 73, 493.
- Fey, C., Rutzinger, M., Wichmann, V., Prager, C., Bremer, M., and Zangerl, C. (2015): Deriving 3D displacement vectors from multi-temporal airborne laser scanning data for landslide activity analyses. GIScience & Remote Sensing, 52(4), 437-461. DOI 10.1080/15481603.2015.1045278.
- Scambos, T. A., Dutkiewicz, M. J., Wilson, J. C., and Bindschadler, R. A. (1992): Application of image cross-correlation to the measurement of glacier velocity using satellite image data. Remote Sensing Environ., 42(3), 177-186.
- Author: Magnus Bremer (c) 2012
- Menu: Grid|Analysis
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Grid 1 | grid, input | GRID_1 | The first grid to correlate | - |
| Grid 2 | grid, input | GRID_2 | The second grid to correlate | - |
| DTM 1 (*) | grid, input, optional | DTM_1 | The first DTM used to assign height information to grid 1 | - |
| DTM 2 (*) | grid, input, optional | DTM_2 | The second DTM used to assign height information to grid 2 | - |
| Output | Correlated Points | shapes, output | CORRPOINTS | Correlated points with displacement and correlation information | - |
| Displacement Vector | shapes, output | CORRLINES | Displacement vectors between correlated points | - |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Search Chip Size (Cells) | choice | SEARCH_CHIPSIZE | Chip size of search chip, used to find correlating reference chip | Available Choices:
[0] 16x16
[1] 32x32
[2] 64x64
[3] 128x128
[4] 256x256
Default: 2 |
| Reference Chip Size (Cells) | choice | REF_CHIPSIZE | Chip size of reference chip to be found in search chip | Available Choices:
[0] 16x16
[1] 32x32
[2] 64x64
[3] 128x128
Default: 1 |
| Grid Spacing (Map Units) | floating point number | GRID_SPACING | Grid spacing used for the construction of correlated points [map units] | Minimum: 0.100000
Maximum: 256.000000
Default: 10.000000 |
| (*) optional |
Command-line
Usage: saga_cmd grid_analysis 19 [-GRID_1 <str>] [-GRID_2 <str>] [-DTM_1 <str>] [-DTM_2 <str>] [-CORRPOINTS <str>] [-CORRLINES <str>] [-SEARCH_CHIPSIZE <str>] [-REF_CHIPSIZE <str>] [-GRID_SPACING <double>]
-GRID_1:<str> Grid 1
grid, input
-GRID_2:<str> Grid 2
grid, input
-DTM_1:<str> DTM 1
grid, input, optional
-DTM_2:<str> DTM 2
grid, input, optional
-CORRPOINTS:<str> Correlated Points
shapes, output
-CORRLINES:<str> Displacement Vector
shapes, output
-SEARCH_CHIPSIZE:<str> Search Chip Size (Cells)
choice
Available Choices:
[0] 16x16
[1] 32x32
[2] 64x64
[3] 128x128
[4] 256x256
Default: 2
-REF_CHIPSIZE:<str> Reference Chip Size (Cells)
choice
Available Choices:
[0] 16x16
[1] 32x32
[2] 64x64
[3] 128x128
Default: 1
-GRID_SPACING:<double> Grid Spacing (Map Units)
floating point number
Minimum: 0.100000
Maximum: 256.000000
Default: 10.000000