ImageEnvelope - Image Envelope¶
Extracts an image envelope.
Detailed description¶
Build a vector data containing the image envelope polygon. Useful for some projection, you can set the polygon with more points with the sr parameter. This filter supports user-specified output projection. If no projection is defined, the standard WGS84 projection will be used.
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 ImageEnvelope .
| [1] | Table: Parameters table for Image Envelope. |
| Parameter Key | Parameter Name | Parameter Type |
|---|---|---|
| in | Input Image | Input image |
| out | Output Vector Data | Output vector data |
| sr | Sampling Rate | Int |
| elev | Elevation management | Group |
| elev.dem | DEM directory | Directory |
| elev.geoid | Geoid File | Input File name |
| elev.default | Default elevation | Float |
| proj | Projection | String |
| inxml | Load otb application from xml file | XML input parameters file |
| outxml | Save otb application to xml file | XML output parameters file |
Input Image: Input image filename.
Output Vector Data: Vector data file containing the envelope.
Sampling Rate: Sampling rate for image edges (in pixel).
[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.
Projection: Projection to be used to compute the envelope (default is WGS84).
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_ImageEnvelope -in QB_TOULOUSE_MUL_Extract_500_500.tif -out ImageEnvelope.shp
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 ImageEnvelope application
ImageEnvelope = otbApplication.Registry.CreateApplication("ImageEnvelope")
# The following lines set all the application parameters:
ImageEnvelope.SetParameterString("in", "QB_TOULOUSE_MUL_Extract_500_500.tif")
ImageEnvelope.SetParameterString("out", "ImageEnvelope.shp")
# The following line execute the application
ImageEnvelope.ExecuteAndWriteOutput()
Limitations¶
None
Authors¶
This application has been written by OTB-Team.