Mateusz, Refer to OGR's VRT format driver page. http://www.gdal.org/ogr/drv_vrt.html
2011/8/11 Mateusz Kędzior <matand...@gmail.com> > Hi Chaitanya, > > I try to add full path to csv file - is it correct? > > ===================================================NEW VRT > FILE==================================== > <OGRVRTDataSource> > <OGRVRTLayer name="evap_OBCXYZn"> > > <SrcDataSource>"/media/windows/studia/2_sem_mgr/mgr/prof_Zawadzki/dods/gldas/00Z07Apr2009_00Z15Apr2009/evap_OBCXYZn.csv"</SrcDataSource> > > <GeometryType>wkbPoint</GeometryType> > <LayerSRS>WGS84</LayerSRS> > <GeometryField encoding="PointFromColumns" x="Longitude" > y="Latitude"/> > </OGRVRTLayer> > </OGRVRTDataSource> > > ================================================================================================ > > When I try use ogrinfor I get an error message: > > FAILURE: > Unable to open datasource `evap_OBCXYZn.vrt' with the following drivers. > > When I use the same tool at csv file I get: > > ================================= > > INFO: Open of `evap_OBCXYZn.csv' > using driver `CSV' successful. > 1: evap_OBCXYZn (None) > > ================================ > > The CSV file contain such information: > > ============================ > Longitude,Latitude,Name > 20.132145,52.4227439,1.78132e-05 > 20.382145,52.4227439,1.89083e-05 > ... > and so on.. > ============================ > > How I can change it to get vector-point layer? As I wrote I can only get a > layer without geometry if I point to csv file. > > ============ > Best regards, > Mateusz > > > > W dniu 11 sierpnia 2011 10:04 użytkownik Chaitanya kumar CH < > chaitanya...@gmail.com> napisał: > > What is the output of ogrinfo on the .vrt file? >> >> >> 2011/8/11 Mateusz Kędzior <matand...@gmail.com> >> >>> Hi Chaitanya, >>> >>> I say that I don't need to create VRT file, but I was wrong. When I try >>> to run ogr2ogr utility: >>> * >>> ogr2ogr -f GML output_file.gml input_file.csv* >>> >>> I discover that created file contain only table - if I choose ESRI >>> shapefile as output, I get only dbf file. >>> >>> So i try to generate such file: >>> >>> >>> ================================================================================ >>> <OGRVRTDataSource> >>> <OGRVRTLayer name="evap_OBC_OBCXYZn"> >>> <SrcDataSource>evap_OBC_OBCXYZn.csv</SrcDataSource> >>> >>> <GeometryType>wkbPoint</GeometryType> >>> <LayerSRS>WGS84</LayerSRS> >>> <GeometryField encoding="PointFromColumns" x="Longitude" >>> y="Latitude"/> >>> </OGRVRTLayer> >>> </OGRVRTDataSource> >>> >>> ================================================================================= >>> >>> but: >>> >>> - if I type .vrt file as input I get an empty GML file >>> - if I I type .csv file as input I get an output which contain only >>> table (without geometry) >>> >>> How I can run it properly? >>> Which values are allowed in <GeometryField encoding> property? >>> =================== >>> Best regards, >>> Mateusz >>> >>> W dniu 10 sierpnia 2011 05:58 użytkownik Chaitanya kumar CH < >>> chaitanya...@gmail.com> napisał: >>> >>> Mateusz, >>>> >>>> You have to change the OGRVRTLayer name property to point to the file >>>> name without the extension. Also change the SrcDataSource element. >>>> >>>> FYI, this process creates a vector file with points. gdal_polygonize >>>> produces polygons. >>>> >>>> >>>> 2011/8/10 Mateusz Kędzior <matand...@gmail.com> >>>> >>>>> Hi again, >>>>> >>>>> is it mandatory to create such file? >>>>> Regarding to information on GDAL/OGR page should I create simple text >>>>> file which contains only other OGRVRTLayer name property : >>>>> >>>>> <OGRVRTDataSource> >>>>> <OGRVRTLayer name="test"> >>>>> <SrcDataSource>test.csv</SrcDataSource> >>>>> <GeometryType>wkbPoint</GeometryType> >>>>> <LayerSRS>WGS84</LayerSRS> >>>>> <GeometryField encoding="PointFromColumns" x="Longitude" >>>>> y="Latitude"/> >>>>> </OGRVRTLayer> >>>>> </OGRVRTDataSource> >>>>> >>>>> ============== >>>>> Best regards, >>>>> Mateusz >>>>> >>>>> W dniu 9 sierpnia 2011 20:13 użytkownik Chaitanya kumar CH < >>>>> chaitanya...@gmail.com> napisał: >>>>> >>>>>> Create a text file with just the header. Use the cat command to join >>>>>> this file and the xyz file. >>>>>> $ cat HeaderFile.csv file1.csv > file1.cHi sv >>>>>> >>>>>> You can repeat this on all files in a shell script. >>>>>> >>>>>> Otherwise add the following line in the gdal2xyz.py script at line 144 >>>>>> [1]. >>>>>> >>>>>> dst_fh.write( 'Longitude,Latitude,Name' ) >>>>>> >>>>>> You will also have to create a separate vrt file for each csv file. >>>>>> The SrcDataSource element value changes for each file. >>>>>> >>>>>> [1]: >>>>>> http://trac.osgeo.org/gdal/browser/trunk/gdal/swig/python/scripts/gdal2xyz.py?rev=21127#L145 >>>>>> >>>>>> >>>>>> 2011/8/9 Mateusz Kędzior <matand...@gmail.com> >>>>>> >>>>>>> Chaitanya, >>>>>>> >>>>>>> if I understand properly, I need to add one line to each of processed >>>>>>> files. >>>>>>> How I can do it quickly? Is there any option in gdal2xyz.py script? >>>>>>> >>>>>>> If no - what would You recommend? >>>>>>> I think about sed utility, but it's general difficult in use. >>>>>>> >>>>>>> When I am thinking about Python I see only one possibility - load >>>>>>> each file to variable and then assign to another first line plus >>>>>>> variable >>>>>>> and at last - save it. >>>>>>> >>>>>>> ============== >>>>>>> Best Regards, >>>>>>> Mateusz >>>>>>> >>>>>>> W dniu 9 sierpnia 2011 13:38 użytkownik Chaitanya kumar CH < >>>>>>> chaitanya...@gmail.com> napisał: >>>>>>> >>>>>>> Mateusz, >>>>>>>> >>>>>>>> gdal2xyz.py creates space delimited fields. Consider running it with >>>>>>>> the -csv option to delimit it with comma. >>>>>>>> Now you can almost use it as a csv format vector file. You just need >>>>>>>> to add a header row and define a small VRT file as described in OGR's >>>>>>>> CSV >>>>>>>> driver page[1]. >>>>>>>> Run ogrinfo and ogr2ogr on the .vrt file to check the file. >>>>>>>> >>>>>>>> [1]: http://www.gdal.org/ogr/drv_csv.html >>>>>>>> >>>>>>>> 2011/8/9 Mateusz Kędzior <matand...@gmail.com> >>>>>>>> >>>>>>>>> Hello, >>>>>>>>> >>>>>>>>> I would like to show value of each raster cell as label. My idea (I >>>>>>>>> don't know any plugin or any functionality in GDAL/OGR which allow to >>>>>>>>> do it >>>>>>>>> easier) is to export raster using gdal2xyz.py into coordinates-value >>>>>>>>> format >>>>>>>>> and then save it as vector (GML or shapefile). For this second task, >>>>>>>>> I try >>>>>>>>> to use >>>>>>>>> >>>>>>>>> ================================================================================================================================================= >>>>>>>>> gdal_polygonize.py: >>>>>>>>> gdal_polygonize.py rainfXYZ.txt rainf.shp Creating output rainf.shp >>>>>>>>> of format GML. 0...10...20...30...40...50...60...70...80...90...100 - >>>>>>>>> done. >>>>>>>>> >>>>>>>>> ================================================================================================================================================= >>>>>>>>> unfortunately I am unable to load created file (even if I change >>>>>>>>> the extension to .gml) >>>>>>>>> ogr2ogr tool don't even recognize this format. >>>>>>>>> >>>>>>>>> ========================= >>>>>>>>> Thank You in advance, >>>>>>>>> Mateusz >>>>>>>>> >>>>>>>>> _______________________________________________ >>>>>>>>> gdal-dev mailing list >>>>>>>>> gdal-dev@lists.osgeo.org >>>>>>>>> http://lists.osgeo.org/mailman/listinfo/gdal-dev >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> Best regards, >>>>>>>> Chaitanya kumar CH. >>>>>>>> >>>>>>>> +91-9494447584 >>>>>>>> 17.2416N 80.1426E >>>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> Best regards, >>>>>> Chaitanya kumar CH. >>>>>> >>>>>> +91-9494447584 >>>>>> 17.2416N 80.1426E >>>>>> >>>>> >>>>> >>>> >>>> >>>> -- >>>> Best regards, >>>> Chaitanya kumar CH. >>>> >>>> +91-9494447584 >>>> 17.2416N 80.1426E >>>> >>> >>> >> >> >> -- >> Best regards, >> Chaitanya kumar CH. >> >> +91-9494447584 >> 17.2416N 80.1426E >> > > -- Best regards, Chaitanya kumar CH. +91-9494447584 17.2416N 80.1426E
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