Hello William,
Here is the gdalinfo output of the the PNG file I am using:
Driver: PNG/Portable Network Graphics
Size is 8844, 7663
Coordinate System is `'
Origin = (563960.437500000000000,6098920.500000000000000)
Pixel Size = (15.000000000000000,-15.000000000000000)
Corner Coordinates:
Upper Left ( 563960.438, 6098920.500)
Lower Left ( 563960.438, 5983975.500)
Upper Right ( 696620.438, 6098920.500)
Lower Right ( 696620.438, 5983975.500)
Center ( 630290.438, 6041448.000)
Band 1 Block=8844x1 Type=Byte, ColorInterp=Red
Band 2 Block=8844x1 Type=Byte, ColorInterp=Green
Band 3 Block=8844x1 Type=Byte, ColorInterp=Blue
Band 4 Block=8844x1 Type=Byte, ColorInterp=Alpha
Projected Co-Ordinate system NAD83-UTM9
running gdal_translate for GTIFF creates a nice 245MB GeoTIFF file.
gdal seems to be working just fine.
.......
Okay after doing some tests with the new 245MB geoTiff file
(translated with gdal), QGIS and GRASS seem to be running fairly
smoothly!
hmmm so I will find/make more geoPNG files and see what the results
are in QGIS/GRASS
For now I suppose I'll work with the much larger TIFF files in QGIS
for my production work.
Thanks for the support I appreciate it.
Mars
On 9-Jul-07, at 4:01 PM, William Kyngesburye wrote:
On Jul 9, 2007, at 5:04 PM, Mars Sjoden wrote:
I am having problems with QGIS continually crashing when using a
Large (135MB) geo-referenced PNG raster relief image.
I have used this raster file in many other GIS apps, including
ArcMap, ArcScene, UDIG,
A check to see if there is something wrong with GDAL (I think Qgis
uses GDAL for image data?) - in a Terminal type (assuming you have
the GDAL framework in your shell PATH):
gdalinfo /path/to/image.png
You can also try gdal_translate to convert it to another format,
like tif, to see if GDAL can read the whole image file.
I don't have a tiff or png that large handy to test myself, though
I can whip something up tomorrow.
I have also tried this file as a geo-TIF which boosts the file size
to 147MB, and QGIS is still unstable.
Is this due to memory usage allocation?
MacBook Pro 2GB of RAM, OSX.4.10, Kyng Chaos Frameworks, QGIS,
GRASS 6.3
Running QGIS solitary with no other user applications.
ie. GRASS also crashes when using this file size.
You mean r.in.gdal?
-----
William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
http://www.kyngchaos.com/
"This is a question about the past, is it? ... How can I tell that
the past isn't a fiction designed to account for the discrepancy
between my immediate physical sensations and my state of mind?"
- The Ruler of the Universe
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