OOh, ok!!! Thanks!!
De: Laurențiu Nicola
Enviado el: dilluns, 31 de juliol de 2023 15:24
Para: Abel Pau
CC: gdal-dev@lists.osgeo.org,
Asunto: Re: [gdal-dev] A question of eficiency
Hi,
GetFeatureCount() exists for GDAL users, not for driver writers. For example,
in QGIS, you can right-click
Hi,
GetFeatureCount() exists for GDAL users, not for driver writers. For example,
in QGIS, you can right-click on a layer, choose "Show Feature Count" and you'll
see the number of features next to the layer name.
Or, to give another example, a hypothetical application could use it to display
a
Hi, here I am again.
Then, after all that information I have the next doubt: for what
GetFeatureCount() is used for??
Thanks!
De: gdal-dev En nombre de Abel Pau
Enviado el: divendres, 21 de juliol de 2023 19:38
Para: Even Rouault ; gdal-dev@lists.osgeo.org
Asunto: Re: [gdal-dev] A question of
tialys.com>
Enviat: divendres, 21 de juliol de 2023 19:32
Per a: Abel Pau<mailto:a@creaf.uab.cat>;
gdal-dev@lists.osgeo.org<mailto:gdal-dev@lists.osgeo.org>
Tema: Re: [gdal-dev] A question of eficiency
Abel,
OK, I now better understand what you meant. Well, no, there's no
tting
strategy with change radically. Thankss!
*De:*gdal-dev *En nombre de *Abel Pau
*Enviado el:* divendres, 7 de juliol de 2023 12:44
*Para:* Even Rouault ;
gdal-dev@lists.osgeo.org
*Asunto:* Re: [gdal-dev] A question of eficiency
Hi again,
I can totally give this number in GetFeatureCoun
!
De: gdal-dev En nombre de Abel Pau
Enviado el: divendres, 7 de juliol de 2023 12:44
Para: Even Rouault ; gdal-dev@lists.osgeo.org
Asunto: Re: [gdal-dev] A question of eficiency
Hi again,
I can totally give this number in GetFeatureCount(). No problem from my driver
to other.
Then I understand
With some formats sizeof, fseek and ftell can be most useful
> On Jul 7, 2023, at 5:33 AM, Abel Pau wrote:
>
> Hi,
> I would like to know if when we use the code of GDAL to program a driver (or
> whatever) in vectors (so, ogr) we can assume that we can know the number of
> elements we are go
...
Thanks for your kind anwser!
De: Even Rouault
Enviado el: divendres, 7 de juliol de 2023 12:32
Para: Abel Pau ; gdal-dev@lists.osgeo.org
Asunto: Re: [gdal-dev] A question of eficiency
Abel,
At the minimum for the reading side of a vector driver, you need to implement
GetNextFeature().
If
Abel,
At the minimum for the reading side of a vector driver, you need to
implement GetNextFeature().
If there is an efficient way of knowing the number of features without
iterating over the whole file (typically a field in a header giving that
number), you may implement GetFeatureCount().
Hi,
I would like to know if when we use the code of GDAL to program a driver (or
whatever) in vectors (so, ogr) we can assume that we can know the number of
elements we are going to import in any way or it would be possible not knowing
that until NextFeature is empty (or something like that). So
Mateusz Loskot wrote
> On 15 October 2015 at 22:33, Tim Crook <
> tim.crook@
> > wrote:
>> I will be working on bugs (and eventually
>> features) of GDAL, so I want to do things like set breakpoints, maybe do
>> profiling of GDAL.
>
> You still can do it.
> ...
I have enabled the "jump to warni
On 15 October 2015 at 22:33, Tim Crook wrote:
> I am trying to build a development environment for Windows desktop. I have
> already run makegdal_gen.bat and the created project files don't load/get
> converted with Visual Studio 2015.
I have just checked:
1) Launch cmd.exe and run makegdal_gen.
On 15 October 2015 at 20:57, Tim Crook wrote:
> Hello there Mateusz.
>
> I am trying to set up a GDAL build environment using Visual Studio 2015 for
> development, not nightly builds. Are there a bunch of project files and a
> solution file archived somewhere that I can use?
Do you mean you are t
Hi,
I am trying to use the GDALDataset::RasterIO method to read all the
bands into a chunk of memory, and be able to access a pixel's values in
all bands by using a [] operator on the memory.
I got the sizes of the data types in all the bands, sum up to get the
total data type size, then
You can refer to the corresponding sample application in the source tree:
http://trac.osgeo.org/gdal/browser/trunk/gdal/swig/csharp/apps/GDALOverviews.cs
Best regards,
Tamas
2008/9/17 guo cheng <[EMAIL PROTECTED]>:
> how to use dataset.buildoverviews in C#.net.
> It seems there are only two par
how to use dataset.buildoverviews in C#.net.
It seems there are only two parameters that are not enough.
I hope you can give me an example.
Thank you very much!
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