From: Roger André <ran...@gmail.com>
Subject: Re: [gdal-dev] Problem in importing to Google Earth a nitf image
converted from a tif image by gdal_translate
To: "mohwawang" <mohwaw...@yahoo.com>
Cc: "gdal-dev@lists.osgeo.org" <gdal-dev@lists.osgeo.org>
Date: Thursday, April 9, 2009, 4:30 PM
Hi Mo,
What is the gdalinfo output for the GeoTIFF that you
created? If you didn't get an error when you tried to
load it in GE, perhaps the georeferencing in the image
doesn't quite match what you specified in your KML.
Roger
--
On Thu, Apr 9, 2009 at 1:21 PM,
mohwawang <mohwaw...@yahoo.com>
wrote:
Hi Roger,
My goal is to be able to directly import NITF image to GE
without using KML. You can see the advantage of this
application - if it works. I'm glad that you have viewed
in GE georeferenced imagery created or altered by gdal.
Maybe you can point out what I did wrong.
It is good that you asked about GeoTIFF. So I used
gdal_translate to convert the tif image to a GeoTIFF image.
I tried to drag and drop the GeoTIFF image to GE but nothing
happened. I did not see the GeoTIFF image in GE and I did
not get any error message either.
I can open the GeoTIFF image with OpenEV and I can read the
lan/lon coordinates and they are correct. One thing is that
it seems that OpenEV does not set North to Up. Its
orientation aligns with the file coordinates - (0,0) is at
the upper left corner. I then opened tif file in the same
OpenEV and they match to each other.
Again, I can import the tif image with its kml to GE but I
can not import the GeoTIFF to GE (without using kml), it
seems that nothing happened. I can import the GeoTIFF to GE
with kml - though that is not what I want. But the GeoTIFF
is better than the NITF that could not be imported to GE
even with the same kml.
What's wrong with GeoTIFF? I mean why I could not
import it to GE? I listed the gdal_translate command line
here:
gdal_translate -of GTiff tiff.tif gtiff.gtf -a_srs
EPSG:4326 -gcp 0 0 -70.887525562763 42.8093748999134 -gcp
560 0 -70.887525562763 42.8082925732318 -gcp 560 419
-70.8894939447889 42.8082925732318 -gcp 0 419
-70.8894939447889 42.8093748999134
I don't have a .ntif file that was not created by gdal
to test GE via the "Import Image Tool".
Thanks.
Mo
--- On Thu, 4/9/09, Roger André <ran...@gmail.com>
wrote:
From: Roger André <ran...@gmail.com>
Subject: Re: [gdal-dev] Problem in importing to Google
Earth a nitf image converted from a tif image by
gdal_translate
To: "mohwawang" <mohwaw...@yahoo.com>
Cc: "gdal-dev@lists.osgeo.org"
<gdal-dev@lists.osgeo.org>
Date: Thursday, April 9, 2009, 12:47 PM
Hi Mo,
Thanks for that pointer on the differences between GE
Layers and Places. I'll be sure to take a close
look
at those links. I've had occasion in the past to
view
georeferenced imagery in Google Earth, much of it
created or
altered by gdal in some way, so this topic interests
me.
I'm curious, is your goal to view the NITF format
specifically and to have GE read the internal
georeferencing
info, or is it just to view the image in GE? It
sounds
like you have already accomplished the latter using a
KML
Ground Overlay and a tif, a method which has also
worked
reliably for me in the past as well. I've also
had
success with PNG and JPEG format files.
Since in your .nitf test the georeferencing was
supplied by
the KML file, the red "X" you are getting
implies
to me that the image format isn't being correctly
interpreted by GE for some reason. The fact that
Envi
chokes on it as well does seem to point to gdal as a
possible culprit, although the NITF format is not one
that I
have seen very much. Have you tried importing the
GeoTIFF
version of your file directly into GE Pro as well?
Also,
do you have a .nitf file that was not created by gdal,
and
which you could use to test GE via the "Add
Image
Overlay" tool?
Roger
--
On Thu, Apr 9, 2009 at 8:37 AM,
mohwawang <mohwaw...@yahoo.com>
wrote:
Roger,
I'm using Google Earth Pro 5.0. Thank you for the
suggestions.
Google Earth Pro 4.0 also supports importing NITF:
http://earth.google.com/userguide/v4/ug_importdata.html
that is for importing your data (including vector data
and
imagery data) to the Places of Google Earth while
http://earth.google.com/userguide/v4/ug_imageoverlays.html
is for "Using Image Overlays and 3D
Models".
See http://earth.google.com/userguide/v4/ug_layers.html#layers_vs_places
for the difference between Layers and Places in GE.
This is the first time I'm importing
geo-referenced
images to Google Earth Pro and so far I don't have
much
luck. As I said that I could not use GE to import the
NITF
images converted from gdal_translate (with EPSG:4326
that is
the same projection, Simple Cylindrical projection, or
known
as Lat/Lon WGS84 that GE uses). So I tried to narrow
down
the problem. This time I imported to GE an native
Erdas
IMAGINE image (.img) (with UTM projection that GE
supports
too) but still failed. The later test case has nothing
to do
with gdal and is purely a question for GE. That .img
image
can be opened by both IMAGINE and OpenEV.
The NITF image (converted by gdal_translate) not just
could
not be opened by GE it could not be opened by ENVI
4.1
either. It can be opened by OpenEV (tightly related to
gdal)
though. So it could be a problem in either
gdal_translate or
ENVI (I doubt though) or both.
Thanks.
Mo
--- On Thu, 4/9/09, Roger André <ran...@gmail.com>
wrote:
From: Roger André <ran...@gmail.com>
Subject: Re: [gdal-dev] Problem in importing to
Google
Earth a nitf image converted from a tif image by
gdal_translate
To: "mohwawang" <mohwaw...@yahoo.com>
Cc: "gdal-dev@lists.osgeo.org"
<gdal-dev@lists.osgeo.org>
Date: Thursday, April 9, 2009, 12:44 AM
Granted, I haven't
tried V 5 yet,
but your quote also states, "Google Earth
Pro or
EC". Are you using one of those versions
of
the
client? In any case, if the file opens in
OpenEV,
chances
are good that the .ntf generated by gdal is ok,
and
that
there is some sort of problem with how Google
Earth
is
reading it. Have you tried emailing the KML
support
list
as well?
--
On Wed, Apr 8, 2009 at 8:51 PM,
mohwawang <mohwaw...@yahoo.com>
wrote:
Google Earth 5.0 supports NITF see
http://earth.google.com/intl/en/userguide/v5/ug_importdata.html
[Importing Imagery
You can open GIS imagery files in Google Earth
Pro or
EC
and have the files correctly projected over the
proper
map
coordinates in the 3D viewer. Google Earth Pro
and EC
support the following types of GIS imagery:
* TIFF (.tif), including GeoTiff and
compressed
TIFF
files
* National Imagery Transmission Format
(.ntf)
* Erdas Imagine Images (.img)
In addition, you can also import the following
images.
Because they do not contain projection
information,
you must
manually edit their coordinates for correct
positioning:
* Atlantis MFF Raster (.hdr)
* PCIDSK Database File (.pix)
* Portable Pixmap Format (.pnm)
* Device Independent Bitmap (.bmp)
Note - All imagery files must contain the
correct
projection information in order to be accurately
re-projected by the Google Earth software.]
Mo
--- On Wed, 4/8/09, Roger André <ran...@gmail.com>
wrote:
From: Roger André <ran...@gmail.com>
Subject: Re: [gdal-dev] Problem in importing
to
Google
Earth a nitf image converted from a tif image
by
gdal_translate
To: "mohwawang" <mohwaw...@yahoo.com>
Cc: "gdal-dev@lists.osgeo.org"
<gdal-dev@lists.osgeo.org>
Date: Wednesday, April 8, 2009, 10:45 PM
See http://earth.google.com/userguide/v4/ug_imageoverlays.html#requirements,
I don't believe the "NITF (rw+):
National
Imagery
Transmission Format" is supported by
Google
Earth.
Roger
--
On Wed, Apr 8, 2009 at 3:27 PM,
mohwawang <mohwaw...@yahoo.com>
wrote:
Hi all,
I'm sorry that this is the third time I
tried
to
send
this message out because I myself didn't
get
the
first
two through gdal-dev@lists.osgeo.org
so I thought others might not get it
either.
I used gdal_translate to convert a tif image
to
a
nitf
image as:
gdal_translate -of nitf in.tif out.ntf
-co
ICORDS=G
Input file size is 561, 420
0...10...20...30...40...50...60...70...80...90...100
-
done.
