So I've got an update on this.
If I run this with the command line (gdal 2.1):
gdalwarp -cutline acid_forest_buffer.shp low_east.tif output.tif
/Processing input file low_east.tif.//
//Using internal nodata values (e.g. -3.40282e+38) for image low_east.tif.//
//Warning 1: Self-intersection at or near point 2309.5402184630693
1121.2793755624425//
//ERROR 1: Cutline is not valid after transformation/
I had one community member confirm the clip works in 2.14.1. I think
ultimately this is a gdal version problem - sort of.
If I look at the shapefile in QGIS I get an error using the topology
tools looking for overlaps. I seem to have 2 multipolygons in this data.
I clean those up and the tool runs as expected.
Is there something with gdal 2.1 that chokes with a multipolygon in
running this type of clip against a raster?
On 10/07/2016 09:27 AM, Randal Hale wrote:
I've tried this on:
* 2.14.6 on Windows
* 2.16.3 on Linux
* Master on Linux
Dropbox Link:
https://www.dropbox.com/sh/zg8miobad8ax0ef/AABXzPzTd8920I248_IprKjba?dl=0
I have a raster and polygons. All matching in projection. M one worry
is the raster is a float32 tiff and something it wrong with it. I
didn't create the raster but I am trying to help someone work their
way through this exercise for a College Class.
When I use the processing tool to clip the raster with the vector I
get an output image that in the legend shows the values as being nan -
which I guess is null. No matter what I do - there is no clip. Just a
large image that is black or nan (null).
Thoughts? I'm stuck. I don't know if I'm seeing a bug or I've got a
bad image. The person originally working through this said it all
works correctly with 2.8 (but I haven't attempted that version as of
yet).
Randy
--
------------------------------------------------
Randal Hale
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611rjh...@northrivergeographic.com
twitter:rjhalehttp://about.me/rjhale
http://www.northrivergeographic.com/introduction-to-quantum-gis
https://www.facebook.com/NRGSInc
--
------------------------------------------------
Randal Hale
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 rjh...@northrivergeographic.com
twitter:rjhale http://about.me/rjhale
http://www.northrivergeographic.com/introduction-to-quantum-gis
https://www.facebook.com/NRGSInc
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