Agisoft Metashape Professional 1.6 is capable of processing the panchromatic and multispectral satellite images, provided that sufficiently accurate Rational Polynomial Coefficients (RPC) data is available for each image. 

RPC coefficients are loaded automatically if they are present in RPC coefficient tag of image EXIF data. Alternatively, they can be loaded from supplementary rpc.txt or .rpb files (if available).


Sample image data used for this tutorial is accessible from ISPRS web-site:

https://www.isprs.org/data/ikonos_hobart/default.aspx



To load satellite images (satellite images with RPC coefficients)

If RPC coefficients are provided as supplementary rpc.txt or .rpb files make sure that "Load satellite RPC data from auxiliary TXT files" option is enabled in the Advanced tab of the Preferences dialog before adding images to the project:


1. Select Preferences command from Tools menu. Click Advanced tab and turn on the check box "Load satellite RPC data from auxiliary TXT files". 


2. Make sure the RPC coefficients were loaded correctly. To do this check that Camera type is automatically set to RPC for the calibration group in Camera Calibration dialog related to the load satellite images.

Note: 

  • Satellite images often have very large resolution and navigation in the Photo view may be slow. Metashape can take advantage of multi resolution TIFF files with overviews, which greatly improve user experience.
  • If the available satellite images do not contain overviews, it is highly recommended to create them first. This can done using Convert Images command from the Export submenu from the File menu.


To generate optimized TIFF images for faster navigation


1. Add original images to an empty project as described in the previous procedure. 


2. Select Convert Images... command from the File Menu -> Export submenu. 


3. In the Convert Images dialog make sure that Write tiled TIFF and Generate TIFF overviews options are enabled. If the images are larger than 4GB you will also need to enable Write BigTIFF file option


4. Make sure that Filename template is initialized to some reasonable value. The default {filename}.{fileext} value should work in most cases. 


5. In the Apply to section select All cameras and click OK button. 


6. In the Select Folder dialog select a folder to save optimized images. It is recommended to select a new empty folder for the images to make sure that original files are not overwritten. 


7. Click on Select Folder button to start conversion. 



8. After conversion is complete generated images can be loaded into a new project for processing. 


Note:

  • Convert Images command automatically embeds RPC coefficients to EXIF meta data of the generated files, so you don't need to copy auxiliary TXT files to the new image folder.


Align images

1. Create a New project and add the images using Add Photos command in the Workflow menu. If the auxiliary text files with RPC coefficients are available, make sure that the names of the image files correspond to the filenames of the auxiliary files.


2. Check that Camera type is switched to RPC for the related calibration groups in Camera Calibration dialog.


3. Align images. Select Align photos command from the Workflow menu.

Guided image matching option can be enabled, if the number of detected tie points does not suffice the required needs.


4. Click OK button.


Optimization


1. Select Optimize button on the Reference pane.



2. In Optimize Camera Alignment dialog box check cx and cy parameters to be optimized:

3. Click OK button.


Build Dense Cloud   


1.  Select Build Dense Cloud command from the Workflow menu. Set the following recommended values for the parameters in the Build Dense Cloud dialog:


2. Click OK button.


Build DEM


1. Select Build DEM command from the Workflow menu. Set the following recommended values for the parameters in the Build DEM dialog:


2. Click OK button.

Build Orthomosaic 


1. Select the Build Orthomosaic... command from the Workflow menu. 


2. In the Build Orthomosaic dialog box set parameters for building orthomosaic:


3. Click OK button.