Dear all
We are using gdal_contour to generate shape files. They look good and appear to
be correct, but we need to label them with the value they represent.
However, no such information appears to be available in the shape files. We
thought we could work with the ID attribute which is the only
Ole,
You can specify a field in the contour features using the '-a' option. You
can also use the '-3d' option to include the elevation value in the z value
at every vertex. (http://www.gdal.org/gdal_contour.html)
On Wed, Jul 7, 2010 at 1:26 PM, Ole Nielsen wrote:
> Dear all
>
>
>
> We are usin
Hello there,
is it possible to identify the two neighbouring OGRGeometries of another
OGRGeometry??
Therefore I miss an adequate function in the GDAL-API.
Greets,
Alex
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Thank you very much for your reply. I misunderstood the –a option. It works
beautifully and our SHP as well as KML files now have each contour clearly
labelled with its value.
Here’s an example of a command that does the trick.
gdal_contour -a Thickness[cm] -fl 1.00 2.00 5.00 50.000
Ole,
You create contours directly into KML format using the -f option.
On Wed, Jul 7, 2010 at 2:42 PM, Ole Nielsen wrote:
> Thank you very much for your reply. I misunderstood the –a option. It
> works beautifully and our SHP as well as KML files now have each contour
> clearly labelled with i
Alex,
If I understand you correctly, the method OGRGeometry::Touches() can help
you.
You can see it's description and similar functions at
http://gdal.org/ogr/classOGRGeometry.html
On Wed, Jul 7, 2010 at 2:17 PM, Alexander Plum wrote:
> Hello there,
>
> is it possible to identify the two neighb
Look,
I am working on a function which paints OGRGeometries representing highlines.
Before painting them I want to make sure wether the new OGRGeometry should be
painted or not. If the distance to the two neighbours is too near to its both
neighbours, the
new highlinie should not be painted. I a
Hi All,
Can I convert huge PNG image to JP2 using GDAL.
Thanks in advance.
Best,
Tejas
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Gajera Tejas wrote:
Hi All,
Can I convert huge PNG image to JP2 using GDAL.
Thanks in advance.
Tejas,
Yes, assuming you have a JPEG2000 driver enabled in GDAL (there are none
in a default build). For instance, if you have built against the Kakadu
library you could do:
gdal_translate -of JP2
Hello Peter,
The approach of scaling values into integers, if I recall correctly, is also
used in the transfer protocol for ArcSDE. I have considered this as an
option and was wondering if any of the non-ESRI datasources used that
approach.
I have seen the second method you describe being used fo
The fix in
http://trac.osgeo.org/gdal/changeset/19985
I can download and replace the file in the 1.7.2 version of gdal I have
and compile gdal again and it will work?
Or should I wait for 1.7.3?
Yours
Tomas
Tomas R skrev 2010-07-06 20:02:
So a solution/a fix is available when 1.7.3 is rel
RoadMap http://roadmap.sourceforge.net/
uses a similar compression trick of storing data in spatial "squares"
Each square has an origin of x,y, and all coordinates within the square
are stored relative to the square origin. So depending on your needed
resolution you might be able to compress an
Tomas,
Yes, you can patch the file rikdataset.cpp in 1.7.2 using
http://trac.osgeo.org/gdal/changeset/19986 and compile it.
There have been no other changes.
On Wed, Jul 7, 2010 at 10:28 PM, Tomas R wrote:
> The fix in
> http://trac.osgeo.org/gdal/changeset/19985
> I can download and replace t
Le Wednesday 07 July 2010 18:58:45 Tomas R, vous avez écrit :
> The fix in
> http://trac.osgeo.org/gdal/changeset/19985
> I can download and replace the file in the 1.7.2 version of gdal I have
> and compile gdal again and it will work?
Yes it should work just fine
__
nice :)
thanks.
Even Rouault skrev 2010-07-07 19:52:
Le Wednesday 07 July 2010 18:58:45 Tomas R, vous avez écrit :
The fix in
http://trac.osgeo.org/gdal/changeset/19985
I can download and replace the file in the 1.7.2 version of gdal I have
and compile gdal again and it will work?
Yes it
and it works, as expected, as it should.
Thanks.
Tomas R skrev 2010-07-07 20:29:
nice :)
thanks.
Even Rouault skrev 2010-07-07 19:52:
Le Wednesday 07 July 2010 18:58:45 Tomas R, vous avez écrit :
The fix in
http://trac.osgeo.org/gdal/changeset/19985
I can download and replace the file
Greg,
Histogram for each band of a raster can be viewed using the '-hist' option
with gdalinfo. However, the display is not pretty and will be slow.
On Thu, Jul 8, 2010 at 3:30 AM, Greg Coats wrote:
> http://www.gdal.org/classGDALRasterBand.html indicates that there is
> support within GDAL for
No one?
Ok, I guess then that there are no common function/method of doing this.
My approach will the be trial and error. From WGS 84 transform to the
local coordinate system and back again to WGS84 and check if the result
seems valid.
Should work or any expert here have another solution?
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.
Hi,
first of all I'm collecting OGRGeometries from OGRFeatures. The OGRFeatures
exist in a OGRLayer in which the function 'GDALContourGenerate' has written.
I put these OGRGeometries (these geometries should later be painted) into a
std::vector. Before putting the next OGRGeometry into this vect
You mean
area_of_use_code="2847"
which gives
area_of_use="Sweden. For medium and small scale applications:- all
country. For large scale applications:- communes between approximately
14 deg 40 min and 16 deg 55 min East. See information source for map."
information_source="Lantmateriverket (N
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