Compute features attributes of a vector dataset over an image.
This application computes radiometric and shapes attributes on a vector dataset, using an image. The results are stored in the attribute table. Shape attributes are : number of pixels, flatness, roundness, elongation, perimeter. Radiometric attributes are for each band of the input image : mean, standard-deviation, median, variance, kurtosis, skewness.
This application has several output images and supports “multi-writing”. Instead of computing and writing each image independently, the streamed image blocks are written in a synchronous way for each output. The output images will be computed strip by strip, using the available RAM to compute the strip size, and a user defined streaming mode can be specified using the streaming extended filenames (type, mode and value). Note that multi-writing can be disabled using the multi-write extended filename option: &multiwrite=false, in this case the output images will be written one by one. Note that multi-writing is not supported for MPI writers.
Input vector dataset
-in filename [dtype] Mandatory
Input vector dataset providing segmentation.
Input reference image
-im image Mandatory
Input image used to compute radiometric attributes.
-field string Default value: label
Name of the field containing object IDs.
-background int Default value: 0
Background value. Needs to be different of any object ID.
From the command-line:
otbcli_ObjectsRadiometricStatistics -in segmentation.shp -im image_XS.tif -field label -background 0
import otbApplication app = otbApplication.Registry.CreateApplication("ObjectsRadiometricStatistics") app.SetParameterString("in", "segmentation.shp") app.SetParameterString("im", "image_XS.tif") app.SetParameterString("field", "label") app.SetParameterInt("background", 0) app.ExecuteAndWriteOutput()