hello
how can I change data type of a shapefile by ogr2ogr ?
regards
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Frederick,
You can use GCPs you used to create the polynomials directly in gdal
utilities to correct the deformed images.
I assume that your current images don't have any projection info.
1. First use gdal_translate with the -gcp option to create a dataset with
your control points. You may also
Hi, I’m using gdal c++ API.
I’d like to implement an algorithm to georeference noaa L1b images(of
Argentine in particular). The number of GCPs returned by the L1b driver are
not enough to use triangulation(midcourse solution until a better algorithm
can be implemented).
Searching gdal-dev
Hi Chaitanya,
first of all I'd like to thank you for the information.
So if I understood you correctly, it is not necesseary to use the polynomial
we calculated but only a dataset of the control points we used and
gdal_transalate calculates a polynomial internally. Do you know how exactly
this
Hi
From memory the l1b driver doesn't use enough points to get proper
geolocation because it sub-samples the 51 which are provided in the l1b
file. The best solution (that recommended by NOAA) is to use lagrange
interpolation across the 51 points. A lagrange algorithm has been provided
in the
Ahmet,
You can use OGR SQL [1] to typecast fields and other stuff. You can use
ogr2ogr [2] with the -sql option and supply the sql statement.
[1]: http://trac.osgeo.org/gdal/wiki/rfc21_ogrsqlcast
[2]: http://www.gdal.org/ogr2ogr.html
2011/6/15 ahmet temiz ahmettemi...@gmail.com
hello
how
On 11-06-14 09:18 PM, Cole, Derek wrote:
Hrmm, that is sort of unfortunate. I have set up a tiling algorithm to read
in tiles at a time of imagery data, which is already slow-ish, even doing it
it with threads. Having to do a whole new read of the entire image at once
(since it doesnt seem
Ahmet,
You can also change geometry type, it is also an option with
ogr2ogr [2], -nlt. I've only used -nlt to promote to multi-geometry.
Eli
On 6/15/2011 at 7:27 AM, in message
BANLkTik8UghqaRv8E-pES6OSv-+e=a3...@mail.gmail.com, Chaitanya kumar
CH
chaitanya...@gmail.com wrote:
Ahmet,
Hi,
Assuming the following:
src_ds = gdal.Open('test_3.ter') dst_ds =
driver.CreateCopy('test_6.hf2', src_ds, 0)
dst_ds.SetGeoTransform([582495,1,0.5,4512717,0.5,-1])0 srs =
osr.SpatialReference() srs.SetUTM(18,1)0
srs.SetWellKnownGeogCS('WGS84')0 dst_ds.SetProjection(
Frederick,
GCP is a control point. Ground Control Point. They are not visible in the
image. Just a map of pixel-line to coordinates.
I am not familiar with how the warping algorithm handles the GCPs. But if
you want, you can also set the projection info after you use your own method
to correct
Hi Folks,
Multipart question
I am using gdal_translate to pull out files from JPEG2000 files
wrapped by an NTF wrapper.
It seems fine, but I am losing all metadata and no headers are built
when I do this.
I can get readable ENVI files or Geotiffs but they're often flipped
back to front, or
Hi Folks,
I've run into a strange thing, gdal_translate -co compress=lzw is
creating files that are larger than the source uncompressed image.
Input:
04/04/2006 08:39 AM 959,236,993 A1.tif
Results of gdal_translate -co compress=[lzw,packbits,none]
15/06/2011 10:35 AM
Bringing this back up, as I am curious. I have started playing around with
using RasterIO and providing smaller output buffers for the read-in data, thus
making GDAL do the downsampling (which apparently is nearest neighbor type?).
Do you think this is faster than creating Overview imagery,
Its just how compression works. If some data is reduced in size then
other has to grow in size. Try -co compress=deflate -co PREDICTOR=2
On 2011-06-15 19:43, Matt Wilkie wrote:
Hi Folks,
I've run into a strange thing, gdal_translate -co compress=lzw is
creating files that are larger than the
On 11-06-15 01:43 PM, Matt Wilkie wrote:
Hi Folks,
I've run into a strange thing, gdal_translate -co compress=lzw is creating
files that are larger than the source uncompressed image.
Input:
04/04/2006 08:39 AM 959,236,993 A1.tif
Results of gdal_translate -co compress=[lzw,packbits,none]
Hi all,
I'm trying to open the metadata from a subdataset of an HDF5 file...
When I open the file by it's filename and then ask for the metadata
it returns the metadata asociated to the root and all the subdatasets
But when I open the file by specifying the subdataset name to
On 11-06-15 03:19 PM, Alex Mantaut wrote:
Hi all,
I'm trying to open the metadata from a subdataset of an HDF5 file...
When I open the file by it's filename and then ask for the metadata it
returns the metadata asociated to the root and all the subdatasets But when
I open
I'm curious as to why I've not encountered this before as I use lzw
compression all the time. Anyway, as always thanks for the education. :)
I've discovered that for my present project that jpeg-in-geotiff
compression is good enough, which makes me happy because even with
predictor=2 the
Hi Frank:
Thanks for the swift reply.
Right now it opens the metadata asociated to the root, and also
the metadata asociated with all the other groups, but it doesn't open the
metadata asociated to the specified element (bug?)
regards
2011/6/15 Frank Warmerdam
On 11-06-15 03:50 PM, Alex Mantaut wrote:
Hi Frank:
Thanks for the swift reply.
Right now it opens the metadata asociated to the root, and also
the metadata asociated with all the other groups, but it doesn't open the
metadata asociated to the specified element (bug?)
Frank:
I opened a new defect ticket, and suggested a way around the
problem (I'm not sure if it's the best solution)
http://trac.osgeo.org/gdal/ticket/4121
Regards
2011/6/15 Frank Warmerdam warmer...@pobox.com
On 11-06-15 03:50 PM, Alex Mantaut wrote:
Hi Frank:
Hi Chaitanya,
thanks again for your help. I tried to find some information about how to
set the projection info after our method and also how and with which command
apply the modified GCP's... hoping to find a solution soon.
Thank you again,
frederick
--
View this message in context:
What about using the VRT driver? Is that for the situation I am describing?
According to the CreateCopy documentation:
It is intended that CreateCopy() will often be used with a source dataset which
is a virtual dataset allowing configuration of band types, and other
information without
Hi Frank, hi Alex,
Il 15/06/2011 22:34, Frank Warmerdam ha scritto:
On 11-06-15 03:50 PM, Alex Mantaut wrote:
Hi Frank:
Thanks for the swift reply.
Right now it opens the metadata asociated to the root,
and also
the metadata asociated with all the other groups,
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