> Hi,
>
> I am trying to use gdal_grid to interpolate some data and I am having
> trouble making gdal_grid treat spatial data (WGS84 lat/lon coordinates) as
> points on a continuous plane. It seems to be ignoring the dateline so for
> example values at 45, 179 are not properly interacting with
On a sort of related topic, (another NZ projection :-)
EPSG:3994 supercedes EPSG:3752, as EPSG got the initial specification wrong.
This is a projection used for the wider region around NZ, rather than the NZ
mainland, and this projection is used primarily in ESRI to avoid 180 meridian
issues.
Extending this slightly - so it can more easily be discovered by less
technically capable users, & in binary distributions of GDAL.
Is it possible to have a command line parameter for GDAL/Proj (etc) that tells
the user what EPSG version is installed? Perhaps include this information in
the -ve
Hi Jeremy,
Outside of a GDAL solution, what format is the underlying data stored in?
I have resolved issues like this with Postgis data stores by doing the int64 to
string conversion in the query generating the data for the service, or via
views on the source tables.
Not the most elegant approach
Hi Peter,
I've looked at radaman, it is very much in a similar direction, but adds
another tool to the mix, which I'm seeking to avoid if possible.
We work with small Pacific Is nations, often with very little technical
expertise, using TIDEDA, & if a GDAL/mapserver combination is feasible, it
Hi,
I'm exploring the possibility of a GDAL driver for TIDEDA datasets. For a
description of TIDEDA, see:
http://www.niwa.co.nz/software/tideda-time-dependent-data
Briefly, it is a tool for managing timeseries data from sources like climate &
hydrometric stations. NIWA is considering Open Sour
I guess somewhat off topic for a devel list but my 02c
I'd use ogr2ogr to convert the shapefile to a GMT (Generic Mapping Tools)
format vector file & use GMT to create the (COARDS compliant) netCDF grid file
from the vector data.
GMT has several approaches possible, including triangulation,
Ensure you have appropriately modified postgreql.conf & pg_hba.conf to allow
the appropriate external access to the required database, for the required
user, from the client IP (CIDR) address. If this is not enabled, such external
connections cannot happen.
Brent Wood
--- On Sat, 5/12/12, Siju
Does Postgis ST_SimplifyPreserveTopology() work for you?
http://postgis.org/docs/ST_SimplifyPreserveTopology.html
Cheers,
Brent Wood
--- On Tue, 2/21/12, Arnd Wippermann wrote:
From: Arnd Wippermann
Subject: [gdal-dev] Simplify a polygon topology doesn't preserve the topology
To: gdal-de
Hi Martin,
I can't see why that won't work, but it does have one issue, and that is that
if there is already a match, but the parameters are in a different order, you
won't find it, & then you are effectively creating a nonstandard SRID which
duplicates a standard & supported projection.
Wh
ESRI does not use a SRID, it uses a text string that needs complex parsing to
work. If ESRI supported EPSG codes it would be easier...
The spatial_ref_sys table contains entries for all EPSG recognised projections.
If you have a reasonable case to have a projection inluded by EPSG, submit a
req
Hi Jim,
proj.4 (cs2cs) has a parameter to force lat long coords into a +-180 or 0-360
space by specifying the output central meridian.
>From the proj.4 changelog:
2006-10-12 Frank Warmerdam
* Added experimental +lon_wrap argument to set a "center point" for
longitude wrapping of lon
Thanks Stephen,
I should have included this in my first msg, apologies, but thanks for the
reply.
I'm running GDAL v1.6.1, from
ogrinfo --version
GDAL 1.6.1, released 2009/05/11
And, running isql (from unixodbc) also works.
isql --help
unixODBC 2.2.12
isql -v metp niwatest niwatest
libnuma
Hi,
Apologies for the cross posting, but I figure there are experts on both lists.
I'm trying to get a ogr virtual connection working from a Linux host to a
remote Oracle DB to use mapserver for a WFS service providing the required
data..
ODBC is working, eg:
sqlplus user/user@metp
select co
Hi,
I'm guessing this is because the DBF format ESRI decided on for aspatial
attribute data in shapefiles does not have an integer datatype
(sse: http://www.dbase.com/knowledgebase/int/db7_file_fmt.htm)
So an int field gets read into a generic numeric field in the DBF file, rather
than an int
Hi Tim,
S57 is a pretty complex format, so I suggest you look at an intermediate format
that is supported by some sort of data management capability so you can work
with it & select what is to converted to kml.
Postgis is the obvious one, or you could use shapefiles with ogr & something
like Q
Russell McOrmond wrote:
> I am aware of PostGIS, Oracle Spatial and ArcSDE. I only became aware
> that MySQL had extensions as well very recently (My
> brother started at Pythian).
>
>
> http://dev.mysql.com/doc/refman/5.5/en/mysql-gis-conformance-and-compatibility.html
> http://www.gdal.org/o
Hi,
Is there a simple way (using gdal) of retrieving the colour spectra at
specified sample points in georeferenced images?
I figure GRASS has some tools to do this, as does GMT, but was wondering if
GDAL could support this functionality directly.
Lots of points/images to work through.
Thanks
Hi Pawell,
A shapefile is not usually spatially indexed, and ogr cannot use the ESRI index
anyway, so the entire dataset is read every time to plot it. For a large
shapefile this is considerable overhead, especially when you are zoomed in &
only want to render a small region.
See the info her
assuming you are using Linux
Can you use paste to merge the files first, redirected into a new file of x y z
columns, then use GDAL on the result (assuming the order of values is the same
in all 3 files)
eg:
echo 1 > f1
echo 2 > f2
echo 3 > f3
paste f1 f2 f3
1 2 3
Brent Wood
Hi Alan,
This doesn't fix you problem specifically, but may help.
We usually use the packages from the OpenSuse Geo repository, which has SLES
specific builds available. (We are using SLES for most Linux servers in our
organisation)
See: http://download.opensuse.org/repositories/Application:
I guess another possibility would be to approach contacts in the OGC, whose
business is essentially all about open standards in the wider GIS arena.
Members of OGC who have links to FOSS/OSGEO that I'm aware of include Autodesk,
Lisasoft & TOPP, & some national bodies such as LINZ.
Brent Wood
I'm not sure if anyone knows, the last time I saw this discussed there was no
clear answer. This doesn't help muc...
http://www.acronymattic.com/OGR.html
At a guess it was something like Open Geometry Reformatter, which makes about
as much sense as anything :-)
If anyone does know, could this
Yep.
In your ogr2ogr query string query try
"select buffer(area, nn.nn) as geom from table where...;"
PostGIS will buffer it before sending it to GDAL for export to shapefile.
Or if you are repeatedly doing this, create a view in PostGIS with the buffer,
& select this with GDAL, whichever sui
Hi.
I suggest you look at OpenSuse. That's my preferred FOSS GIS platform for a few
years now.
The guys that maintain the OpenSUuse GIS repository are really efficient &
helpful. The couple of times I've wanted an updated package there I've emailed
them & it's been done in a couple of days.
Hi Frank,
My current workaround is to use the GML driver instead of Mapinfo (don't
extract the geometries as geometries), then grep/sed/tr the GML file to get a
GMT one. This does not actually use ogr2ogr to get the geometries, but returns
them as a field with the X & Y coords in a space separa
Hi,
My apologies for introducing problems from an old version, but it is what is
installed & I can't have it changed for weeks at least
The problem is with ogr2ogr in version 1.3.1 of GDAL under FreeBSD.
I need to generate GMT files for an online mapping application generating
publication
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