Am 19.09.2012 05:11, schrieb Antonio Silva:
Now I'm getting: Warning : the input vector layer has a SRS, but the
source raster dataset does not.
Cutline results may be incorrect.
So, what is going wrong? The asc (raster file) and the shape with the
polygon can be downloaded at
One other thing, you want to collect statistics for your clipped raster, so
when you clip the raster make sure that you tick 'no data value' and enter a
value of (say) -3. This will set the value of the pixels in your clipped
raster that lie outside of your area of interest to 'null' and they
Dear Nick and André
Finally I got to the proper results:
STATISTICS_MAXIMUM=22.629600524902
STATISTICS_MEAN=21.829234117232
STATISTICS_MINIMUM=20.97500038147
STATISTICS_STDDEV=0.40600423541182
Thank you all very much!
Antonio
2012/9/19 Nick Hopton nhop...@gmail.com
One other thing, you want
Antonio Silva wrote
Following the suggestions I got an error message: Cannot compute bounding
box of cutline. when cutting the raster.
Just checking, but the raster layer and the vector polygon layer do have the
same CRS? You can't cut a raster with a vector unless both have the same
native
Am 18.09.2012 10:32, schrieb Nick Hopton:
Antonio Silva wrote
Following the suggestions I got an error message: Cannot compute bounding
box of cutline. when cutting the raster.
Just checking, but the raster layer and the vector polygon layer do have the
same CRS? You can't cut a raster with
hi all,
all layers must have same SR
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Thanks again for the attention and patience, but I'm still not succeed.
A checklist:
1) on-the-fly CRS transformation turned off - OK
2) when I load the raster layer I indicate the CRS WGS84
(+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs)
Once it's loaded I change the map color from grey to
Thanks Nick and Carlos,
Following the suggestions I got an error message: Cannot compute bounding
box of cutline. when cutting the raster. I cannot understand where is the
problem. It happened only with this kind of raster. I tried with nautical
charts and georeferenced maps from Google Earth
Hi Antonio,
I recommend that you enable Sextante pluging for Quantum, in the latest
version comes with tools SAGA, there are algorithms for working with
raster, but I still have not successfully tested.
The other option is to use raster tools, such as Clipper, it gives you
an option to use a
I think the first thing to do is clip the raster to your area of interest
using the vector polygon. Raster - Extraction - Clipper. Select the
polygon shapefile as the mask layer.
To get the statistics load the clipped raster, right-click on it in the
layers panel, select Properties and then click
Hi fellows
This is my first post in this list. I've been using QGIS since the end of
last year. I run QGIS on a UBUNTU 12.04 64 bits system.
My purpose is to visualize and analyze fishery and oceanography information
on a GIS platform. I'm biologist / oceanographer and I work at Sao Paulo
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