ith the same attribute value (an id number) into a single geometry?
Thanks for your help,
Francis Markham
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Thanks for the feedback Antonio and Even, it is very helpful.
I probably should have specified that I want to do message passing across a
cluster using MPI, rather than shared memory multithreading. I'll do some
performance testing to see what the relative speeds of having workers send
their data
Is there any way to disable the block cache altogether? Does setting the
cache size to zero work? And is there a way to do this from a python
script?
Cheers,
Francis
On 9 February 2011 10:40, Frank Warmerdam wrote:
> So, with some care you could in theory write from multiple threads,
> but y
Ouch, I guess I'll be slicing and mosaicing, sending all my data across the
network, or looking for another IO library. Which approach would you
recommend? Are you aware if any of the major non-GDAL libraries for popular
formats (e.g. libgeotiff) support concurrent writes?
-Francis
On 9 Februar
reads to
read and write concurrently, but I am unsure how I might do this safely.
Any suggestions would be greatly appreciated.
Kind Regards,
Francis Markham
On 9 February 2011 09:14, Even Rouault wrote:
> Le mardi 08 février 2011 23:07:36, Stefano Moratto a écrit :
> > Thanks for
Is there any reason not to include a heuristic that uses strtod() or
similar to test for the zeroness of the last argument?
-Francis Markham
On 29 November 2010 15:24, Frank Warmerdam wrote:
> Ole Nielsen wrote:
>>
>> I am posting this again without test files attached due the 50
If you're using Python, I'd recommend checking out the shapely package (
http://pypi.python.org/pypi/Shapely ):
You can load your shapefile using ogr, and then import the geometry to
shapely where you can do the geometry predicate calculations:
>>> import ogr
>>> from shapely.wkb import loads
>>>
Thanks for your encyclopedic response Jason! If you don't mind
detailing the problems with running GDAL scripts in process, and your
work-around for avoiding it, I would be very interested.
Cheers,
Francis
On 12 August 2010 02:49, Jason Roberts wrote:
> ArcGIS 10 installs Python 2.6 and numpy
The driver and datasource are going out of scope. The former can be fixed
by using ogr.Open instead of driver.Open The latter can be fixed by
returning it from the function. A revised version of your code would look
like:
# import modules
from osgeo import ogr
def openShapeLine(shapefile):
#
Is there an FAQ somewhere we can put this? It bit me when I was
starting with GDAL and Python too.
Cheers,
Francis
On 21 July 2010 04:00, Howard Butler wrote:
>
> On Jul 20, 2010, at 12:51 PM, Python Gis wrote:
>
>> Hi
>> this is my code:
>>
>> from osgeo import ogr
>>
>> def OpenLayer(shape_p
ieving the encoding
would need to be paired with this.
Is this the appropriate place to have this discussion? I would be
happy to provide a patch implementing this feature however it is
deemed most appropriate.
Kind Regards,
Francis Markham
__
nto infinite loops or alike.
> not to hard to step from (in WGS84) 180 to -180 and +85 to -85 and check for
> every fifth degree, or so, if the transformation is valid. When
> transformation not valid the plan is to switch to WGS84 which seems to work
> even though results can be interestin
I think the EPSG dictionary defines areas of validity for the defined
coordinate systems. That could be a starting point, although there
may be a better solution
-Francis
On 8 July 2010 16:01, Tomas R wrote:
> No one?
>
> Ok, I guess then that there are no common function/method of doing this.
gt; Some time ago, there was a mail on this list about problems in case of
>>> conflicting information in the .cpg file compared to the Language Driver
>>> ID
>>> (LDID) in the header of a dBASE file, see:
>>> http://lists.osgeo.org/pipermail/gdal-dev/2010-May/0
al-dev/2010-May/024619.html
>
> Hermann
>
> On 06/07/2010 04:13, Francis Markham wrote:
>
> Okay, I will take that approach then. Thank you all for your help.
>
> What specific value should I write into the .cpg? The string '65001'
> or the string 'utf-8&
;
> Peter
>
> On Mon, 2010-07-05 at 19:18 +1000, Francis Markham wrote:
>> At the bottom of this page, for one:
>> http://resources.arcgis.com/content/kbase?fa=articleShow&d=21106
>>
>> But honestly I've found hard to find information about this. I'd
ote:
> Francis, you wrote:
>
>> > I have heard that the use of UTF-8 in shapefiles is not portable.
>
> Where did you hear this?
>
> Regards, Hermann
>
>
> On 03/07/2010 04:40, Francis Markham wrote:
>>
>> Hi there,
>>
>> I'm trying
g can store a shapefile's codepage. I
don't know how to put these pieces together to create a portable
solution, however.
Apologies if this is a newbie question, but I can't find answers on the web.
Thanks,
Francis Markham
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