Superimpose - Superimpose sensor

Using available image metadata, project one image onto another one

Detailed description

This application performs the projection of an image into the geometry of another one.

Parameters

This section describes in details the parameters available for this application. Table [1] presents a summary of these parameters and the parameters keys to be used in command-line and programming languages. Application key is Superimpose .

[1]Table: Parameters table for Superimpose sensor.
Parameter Key Parameter Name Parameter Type
inr Reference input Input image
inm The image to reproject Input image
elev Elevation management Group
elev.dem DEM directory Directory
elev.geoid Geoid File Input File name
elev.default Default elevation Float
lms Spacing of the deformation field Float
fv Fill Value Float
out Output image Output image
mode Mode Choices
mode default Choice Default mode
mode phr Choice Pleiades mode
interpolator Interpolation Choices
interpolator bco Choice Bicubic interpolation
interpolator nn Choice Nearest Neighbor interpolation
interpolator linear Choice Linear interpolation
interpolator.bco.radius Radius for bicubic interpolation Int
ram Available RAM (Mb) Int
inxml Load otb application from xml file XML input parameters file
outxml Save otb application to xml file XML output parameters file

Reference input: The input reference image.

The image to reproject: The image to reproject into the geometry of the reference input.

[Elevation management]: This group of parameters allows managing elevation values. Supported formats are SRTM, DTED or any geotiff. DownloadSRTMTiles application could be a useful tool to list/download tiles related to a product.

  • DEM directory: This parameter allows selecting a directory containing Digital Elevation Model files. Note that this directory should contain only DEM files. Unexpected behaviour might occurs if other images are found in this directory.
  • Geoid File: Use a geoid grid to get the height above the ellipsoid in case there is no DEM available, no coverage for some points or pixels with no_data in the DEM tiles. A version of the geoid can be found on the OTB website (http://hg.orfeo-toolbox.org/OTB-Data/raw-file/404aa6e4b3e0/Input/DEM/egm96.grd).
  • Default elevation: This parameter allows setting the default height above ellipsoid when there is no DEM available, no coverage for some points or pixels with no_data in the DEM tiles, and no geoid file has been set. This is also used by some application as an average elevation value.

Spacing of the deformation field: Generate a coarser deformation field with the given spacing.

Fill Value: Fill value for area outside the reprojected image.

Output image: Output reprojected image.

Mode: Superimposition mode. Available choices are:

  • Default mode: Default superimposition mode : uses any projection reference or sensor model found in the images.
  • Pleiades mode: Pleiades superimposition mode, designed for the case of a P+XS bundle in SENSOR geometry. It uses a simple transform on the XS image : a scaling and a residual translation.

Interpolation: This group of parameters allows defining how the input image will be interpolated during resampling. Available choices are:

  • Bicubic interpolation: Bicubic interpolation leads to very good image quality but is slow.
  • Radius for bicubic interpolation: This parameter allows controlling the size of the bicubic interpolation filter. If the target pixel size is higher than the input pixel size, increasing this parameter will reduce aliasing artifacts.
  • Nearest Neighbor interpolation: Nearest neighbor interpolation leads to poor image quality, but it is very fast.
  • Linear interpolation: Linear interpolation leads to average image quality but is quite fast.

Available RAM (Mb): Available memory for processing (in MB).

Load otb application from xml file: Load otb application from xml file.

Save otb application to xml file: Save otb application to xml file.

Example

To run this example in command-line, use the following:

otbcli_Superimpose -inr QB_Toulouse_Ortho_PAN.tif -inm QB_Toulouse_Ortho_XS.tif -out SuperimposedXS_to_PAN.tif

To run this example from Python, use the following code snippet:

#!/usr/bin/python

# Import the otb applications package
import otbApplication

# The following line creates an instance of the Superimpose application
Superimpose = otbApplication.Registry.CreateApplication("Superimpose")

# The following lines set all the application parameters:
Superimpose.SetParameterString("inr", "QB_Toulouse_Ortho_PAN.tif")

Superimpose.SetParameterString("inm", "QB_Toulouse_Ortho_XS.tif")

Superimpose.SetParameterString("out", "SuperimposedXS_to_PAN.tif")

# The following line execute the application
Superimpose.ExecuteAndWriteOutput()

Limitations

None

Authors

This application has been written by OTB-Team.