Getting vector output segmentation algorithms to work in QGIS

Question

I am using QGIS 2.0.

I'm trying to run the Watershed Segmentation algorithm, specifically, but I have been receiving the same error message using any of the available segmentation algorithms. I'm new to QGIS and have been running it in OSX 10.9.

The error message I receive says:

Oooops! The following output layers could not be open Output vector file: /var/folders/mq/01l7wc357319d3bxlsfp8n840000gn/T/processing/606c5f7baef84d2c9d91b5fc023a5947/-mode vector -mode.vector.out.shp The above files could not be opened, which probably indicates that they were not correctly produced by the executed algorithm Checking the log information might help you see why those layers were not created as expected

After checking the log, the OTB execution console output says:

OTB execution console output Segmentation -filter watershed -in /Volumes/New Volume/Thesis/soterra_LCmap/soterra_mosaic -filter.watershed.threshold 0.01 -filter.watershed.level 0.1 -mode.vector.inmask /Volumes/New Volume/hancockseg/hancockrst/hancockmask.shp -mode.vector.stitch true -mode.vector.minsize 1 -mode.vector.simplify 0 -mode.vector.layername layer -mode.vector.tilesize 1024 -mode.vector.startlabel 1 -mode.vector.outmode ulco -mode vector -mode.vector.out /var/folders/mq/01l7wc357319d3bxlsfp8n840000gn/T/processing/606c5f7baef84d2c9d91b5fc023a5947/-mode vector -mode.vector.out.shp

ERROR: option -mode.vector.out.shp does not exist in the application.

How can I overcome this issue?

As I said, I'm new to QGIS and don't have any experience with open source GIS/RS software in general. My experience has mostly been with ESRI, ERDAS, and IDRISI. I'm very interested in performing some basic segmentation and classification but with a very specific goal in mind which I doubt I could accomplish using the Semi-Automatic Classification Plugin. I'm tempted to give it a try.

Answer 1

I suspect that there is a bug in Sextante. The command line build regarding user defined parameters is not construct properly. The problem is for the vector data output name.

mode vector -mode.vector.out /var/folders/mq/01l7wc357319d3bxlsfp8n840000gn/T/processing/606c5f7baef84d2c9d91b5fc023a5947/-mode vector -mode.vector.out.shp

This parameter is defined twice (-mode vector).

The application try to create a shapefile

/var/folders/mq/01l7wc357319d3bxlsfp8n840000gn/T/processing/606c5f7baef84d2c9d91b5fc023a5947/-mode vector

which is not.

You should report this issue on the QGIS/sextante bugtracker:

https://hub.qgis.org/projects/sextante/issues

• AndreJ: Does it help to specify the output file directly?