ImageEnvelope¶
Extracts an image envelope.
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¶
Input Image -in image Mandatory
Input image filename.
Output Vector Data -out vectorfile Mandatory
Vector data file containing the envelope.
Sampling Rate -sr int Default value: 0
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 -elev.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 -elev.geoid filename [dtype]
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(https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb-data/blob/master/Input/DEM/egm96.grd).
Default elevation -elev.default float Default value: 0
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 -proj string
Projection to be used to compute the envelope (default is WGS84)
Examples¶
From the command-line:
otbcli_ImageEnvelope -in QB_TOULOUSE_MUL_Extract_500_500.tif -out ImageEnvelope.shp
From Python:
import otbApplication
app = otbApplication.Registry.CreateApplication("ImageEnvelope")
app.SetParameterString("in", "QB_TOULOUSE_MUL_Extract_500_500.tif")
app.SetParameterString("out", "ImageEnvelope.shp")
app.ExecuteAndWriteOutput()