[Qgis-user] Selecting rasters with vector layer

Wed Mar 5 02:44:27 PST 2014

Thank you Eric,

I had to chose FME to save the ECW. My third party software supports other
formats, but TIFF files are huge, so it is not a viable solution.

2014-03-04 17:07 GMT+01:00 Eric Goddard <egoddard1010 at gmail.com>:

> Hi Asher,
>
> Sorry, I didn't read the full GDAL page regarding ECW support
> (http://www.gdal.org/frmt_ecw.html). ECW is a proprietary format owned
> by intergraph. GDAL allows reading and writing of ECW files, but in
> order to write ECW files you have to have a licensing key from
> Intergraph. On Linux, when configuring the the ECW plugin it asks for
> the key, and if the user doesn't have one it is configuring in
> read-only mode. I'm assuming you used the OSGeo4Win installer, which I
> think configures the ECW support as read only by default. If you do
> have a key, I'm not sure how you would go about setting up GDAL ECW
> support to recognize it.
>
> From the gdal ECW page:
> The ECW 4.x SDK from ERDAS is only free for image decompression. To
> compress images it is necessary to build with the read/write SDK and
> to provide an OEM licensing key at runtime which may be purchased from
> ERDAS.
>
>
> Does the third party software you have to use not support any other
> formats?
>
> On Tue, Mar 4, 2014 at 3:41 AM, Asher Kamiraze <asher.kamiraze at gmail.com>
> wrote:
> > Eric,
> >
> > I just tried to create a VRT from all ecw images in a folder.
> Unfortunately,
> > it does not work, the command line seems to be rejected when there are
> too
> > many input files. The problem also appear if directly using the
> gdalbuildvrt
> > from the command line. The only solution I found was to build an
> > input_file_list with the following command:
> >
> > cd <to_my_ecw_folder>
> > dir /b *.ecw > listin_ecw.txt
> > gdalbuildvrt -input_file_list listin_ecw.txt all_ecw.vrt
> >
> > Then, if I try to save the cropping result as an ECW file, I got the
> > following error:
> >
> > Output driver `ECW' not recognised or does not support
> > direct output file creation. The following format drivers are configured
> > and support direct output:
> > GeoRaster: Oracle Spatial GeoRaster
> > VRT: Virtual Raster
> > GTiff: GeoTIFF
> > NITF: National Imagery Transmission Format
> > HFA: Erdas Imagine Images (.img)
> > ELAS: ELAS
> > MEM: In Memory Raster
> > BMP: MS Windows Device Independent Bitmap
> > PCIDSK: PCIDSK Database File
> > ILWIS: ILWIS Raster Map
> > SGI: SGI Image File Format 1.0
> > Leveller: Leveller heightfield
> > Terragen: Terragen heightfield
> > netCDF: Network Common Data Format
> > HDF4Image: HDF4 Dataset
> > ISIS2: USGS Astrogeology ISIS cube (Version 2)
> > ERS: ERMapper .ers Labelled
> > RMF: Raster Matrix Format
> > RST: Idrisi Raster A.1
> > INGR: Intergraph Raster
> > GSBG: Golden Software Binary Grid (.grd)
> > GS7BG: Golden Software 7 Binary Grid (.grd)
> > PNM: Portable Pixmap Format (netpbm)
> > ENVI: ENVI .hdr Labelled
> > EHdr: ESRI .hdr Labelled
> > PAux: PCI .aux Labelled
> > MFF: Vexcel MFF Raster
> > MFF2: Vexcel MFF2 (HKV) Raster
> > BT: VTP .bt (Binary Terrain) 1.3 Format
> > LAN: Erdas .LAN/.GIS
> > IDA: Image Data and Analysis
> > GTX: NOAA Vertical Datum .GTX
> > NTv2: NTv2 Datum Grid Shift
> > CTable2: CTable2 Datum Grid Shift
> > ADRG: ARC Digitized Raster Graphics
> > SAGA: SAGA GIS Binary Grid (.sdat)
> >
> > The generated command line by QGIs is:
> >
> > gdalwarp -q -cutline "F:\\MY_SHP_PATH\\Commune_Aix-en-Provence.shp"
> > -crop_to_cutline -of ECW F:\MY_VRT_PATH\Toutes_dalles_13.vrt
> > "F:/MY_OUTPUT_PATH/crop.ecw"
> >
> > It does not seem to be a "\" "/" issue, since if I choose a .vrt output
> it
> > works fine.
> >
> > Any idea on how to solve the problem?
> >
> > I am running QGIS 2.2.0 on 64 bits windows.
> >
> > Regards
> >
> >
> >
> > 2014-03-04 1:51 GMT+01:00 Eric Goddard <egoddard1010 at gmail.com>:
> >
> >> Yes, you should be able to choose ECW from the files of type drop down
> in
> >> the output file selection dialog and select ECW.
> >>
> >> Eric
> >>
> >>
> >> On Mon, Mar 3, 2014 at 4:48 PM, Asher Kamiraze <
> asher.kamiraze at gmail.com>
> >> wrote:
> >>>
> >>> Thanks Eric, sounds really good. Is there a way to save the resulting
> >>> file (clipped) as an ECW file? I need to process it later with a 3rd
> party
> >>> software.
> >>>
> >>> Regards
> >>>
> >>>
> >>> 2014-03-03 23:26 GMT+01:00 Eric Goddard <egoddard1010 at gmail.com>:
> >>>
> >>>> Hi asher, if you go to raster -> miscellaneous, there is a menu entry
> >>>> called build virtual raster catalog. You can use that to virtually
> mosaic
> >>>> all of your ECW files. This tool creates a new file you can load in
> as a
> >>>> raster that references all of the individual ECW files to display them
> >>>> seamlessly in qgis without having to spend the time to actually
> mosaic all
> >>>> of them together. Load the resulting vrt file into qgis using add
> raster and
> >>>> clip the vrt to your polygon layer using raster -> extraction ->
> clipper.
> >>>>
> >>>> Eric
> >>>>
> >>>> On Mar 3, 2014 3:53 PM, "Asher Kamiraze" <asher.kamiraze at gmail.com>
> >>>> wrote:
> >>>>>
> >>>>> Hi all,
> >>>>>
> >>>>> I have a set of more than 200 ecw rasters that I can easily load in
> >>>>> QGIS. I also have a vector polygon layer which bounds an area
> covering a
> >>>>> part of the area covered by the whole set of rasters. What I would
> like to
> >>>>> do is to extract only, the raster which are intersected by the vector
> >>>>> boundary. As a final goal, I would like to only mosaic thoses
> images. I did
> >>>>> not found a way to easily do this in QGIS. Any idea on how to
> achieve this?
> >>>>>
> >>>>> As a workaround, I have opened only the raster intersecting the
> vector,
> >>>>> and would like to mosaic them. However, it does not seem to be a
> function in
> >>>>> QGIS ready to mosaic all opened (or selected) rasters. Any idea on
> how to
> >>>>> automate the process?
> >>>>>
> >>>>> Hope you could help
> >>>>>
> >>>>> Regards
> >>>>>
> >>>>> _______________________________________________
> >>>>> Qgis-user mailing list
> >>>>> Qgis-user at lists.osgeo.org
> >>>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
> >>>
> >>>
> >>
> >
>
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