Re: [gdal-dev] cropping a tif with lat/lon
Dan, Can you tell what your error message was? On Thu, Apr 21, 2011 at 1:41 AM, spalt d...@nac.net wrote: Hi there! Please forgive this terribly newbie question. Been searching all day and I just don't get it. I have a geotiff VFR image from the FAA with the following coordinates as reported by gdalinfo: Upper Left ( -143411.876, 94058.326) ( 78d44'4.05W, 39d49'53.24N) Lower Left ( -143411.876, -93607.521) ( 78d41'40.46W, 38d 7'55.46N) Upper Right ( 111698.876, 94058.326) ( 75d44'16.70W, 39d50'10.29N) Lower Right ( 111698.876, -93607.521) ( 75d46'8.55W, 38d 8'12.11N) Center ( -15856.500, 225.403) ( 77d14'2.52W, 38d59'36.84N) I would like to crop the file as follows: West_Bounding_Coordinate: -78.734457 East_Bounding_Coordinate: -75.737971 North_Bounding_Coordinate: 39.843493 South_Bounding_Coordinate: 38.132073 I guess the problem is I need to convert the -78.734457 into paramaters for gdal_translate, but when I run this it gives an error: gdal_translate -projwin -78.734457 39.843493 -75.737971 38.132073 in.tif out.tif What am I missing? Thanks!! -Dan -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/cropping-a-tif-with-lat-lon-tp6292065p6292065.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Best regards, Chaitanya kumar CH. /tʃaɪθənjə/ /kʊmɑr/ +91-9494447584 17.2416N 80.1426E ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
[gdal-dev] Extract Extent or Bounding Box for a subset of shapes for a shapefile
Hi All, I think this is the right list for the question below, as I cannot find a different list that matches my question better. I'm using ogr2ogr and ogrinfo (v1.4), and I want to extract the extent from the result of a subsetting where argument. I have a solution here that works but I'm wondering if I'm missing some more obvious solution. In a bash script, I do the following (the core snippet only, as I took out the shebang and option-getting/setting code:) --- rm -rf /tmp/tmpshpfile.* ogr2ogr -where $WHERECLAUSE /tmp/tmpshpfile.shp $FILE ogrinfo -ro -so -al /tmp/tmpshpfile.shp | \ grep Extent | \ tr -d '[:alpha:]:() -' | \ tr ',' ' ' rm -rf /tmp/tmpshpfile.* --- I can use it as follows: --- $ ./bbox.sh -f /path/to/shp/shp_counties.shp -w COUNTY_NAME='Yellow Medicine' 226206.484375 4934737.00313007.25 4979500.50 --- Where the argument to '-w' is put into the '$WHERECLAUSE' variable in the script. This works. As I wrote, though, am I missing something obvious in command-line switches to either of these programs that would simplify this so I wouldn't have to use this script? Or is there some other, better way of doing this? Also, is there a way to pipe the output of ogr2ogr on stdout directly to the stdin of ogrinfo? Thanks, Matt ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] Extract Extent or Bounding Box for a subset of shapes for a shapefile
Sig, ogrinfo doesn't force the recomputation of extent. It is considered as a costly operation. ogrinfo just reports the stored extent. Whereas in ogr2ogr, creating a new file automatically computes the extents. On Fri, Apr 22, 2011 at 7:44 PM, Luca Sigfrido Percich sigfr...@tiscali.itwrote: Hi Matthew, Your question is interesting. ogrinfo -where seemed to be the answer, but... I tried ogrinfo with the -where sql where option with both MapInfo and PostGIS layers. In your case it should be: ogrinfo -ro -so -al -where $WHERECLAUSE whole_shapefile.shp The returned extent is always the same, regardless of the presence or composition of the -where clause, so it refers to the whole layer rather than to the selected features. (I'm using GDAL 1.9 dev) Is this the expected behaviour of ogrinfo -where ...? Or sould -where affect the returned Extent too? Thank you all Sig Il giorno ven, 22/04/2011 alle 08.22 -0500, Matthew Pettis ha scritto: Hi All, I think this is the right list for the question below, as I cannot find a different list that matches my question better. I'm using ogr2ogr and ogrinfo (v1.4), and I want to extract the extent from the result of a subsetting where argument. I have a solution here that works but I'm wondering if I'm missing some more obvious solution. In a bash script, I do the following (the core snippet only, as I took out the shebang and option-getting/setting code:) --- rm -rf /tmp/tmpshpfile.* ogr2ogr -where $WHERECLAUSE /tmp/tmpshpfile.shp $FILE ogrinfo -ro -so -al /tmp/tmpshpfile.shp | \ grep Extent | \ tr -d '[:alpha:]:() -' | \ tr ',' ' ' rm -rf /tmp/tmpshpfile.* --- I can use it as follows: --- $ ./bbox.sh -f /path/to/shp/shp_counties.shp -w COUNTY_NAME='Yellow Medicine' 226206.484375 4934737.00313007.25 4979500.50 --- Where the argument to '-w' is put into the '$WHERECLAUSE' variable in the script. This works. As I wrote, though, am I missing something obvious in command-line switches to either of these programs that would simplify this so I wouldn't have to use this script? Or is there some other, better way of doing this? Also, is there a way to pipe the output of ogr2ogr on stdout directly to the stdin of ogrinfo? Thanks, Matt ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Best regards, Chaitanya kumar CH. /tʃaɪθənjə/ /kʊmɑr/ +91-9494447584 17.2416N 80.1426E ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] Extract Extent or Bounding Box for a subset of shapes for a shapefile
Thank you Chaitanya. I think that this makes great sense when dealing with a summary of the whole layer, especially because a lot of formats store the extent in the layer metadata/header. But if I need to dump all the features, or to get a dump or summary of a filtered set of features (in which case I presume ogr will scan all the features to apply the filter), checking for boundary limits shouldn't add much cost to the already expensive operation. Probably this goes beyond the intended scope of ogrinfo. And Matthew's workaround works fine. Thanks again Sig Il giorno ven, 22/04/2011 alle 20.20 +0530, Chaitanya kumar CH ha scritto: Sig, ogrinfo doesn't force the recomputation of extent. It is considered as a costly operation. ogrinfo just reports the stored extent. Whereas in ogr2ogr, creating a new file automatically computes the extents. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
[gdal-dev] Polygonize from C# ?
Hi list, Can anyone point to any guidance or (preferably) examples on using GDAL.Polygonize() with C# bindings ? I see what the interface is, but there are some unexplained parameters, e.g. string[] options. My eventual goal is to open a raster and produce a WKT POLYGON string enclosing the good (non-NoData) area of the raster. Thanks. . Jay Jennings Senior Software Developer (NASDAQ: GEOY) jennings@geoeye.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] Polygonize from C# ?
Selon Jay Jennings jennings@geoeye.com: Generally, refering to the C/C++ doc is a good way of finding the info : See http://gdal.org/gdal__alg_8h.html#3f522a9035d3512b5d414fb4752671b1 Hi list, Can anyone point to any guidance or (preferably) examples on using GDAL.Polygonize() with C# bindings ? I see what the interface is, but there are some unexplained parameters, e.g. string[] options. My eventual goal is to open a raster and produce a WKT POLYGON string enclosing the good (non-NoData) area of the raster. Thanks. . Jay Jennings Senior Software Developer (NASDAQ: GEOY) jennings@geoeye.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] gdal2tiles.py issue
Thank you thank you thank you, GREATLY appreciated! Typed with thumbs... On Apr 22, 2011 12:25 PM, Klokan Petr Pridal klo...@klokan.cz wrote: Hi Jerl, please read this issue report: http://code.google.com/p/maptiler/issues/detail?id=6 It gives you also explanation and also workaround for this problem Best regards, Petr alias Klokan On Thu, Apr 21, 2011 at 5:50 PM, Jerl Simpson jsimp...@wxtrends.com wrote: Hi guys: I posted a similar question a week or so ago, but have slightly different information that might help me reach a solution. I'm using gdal2tiles.py to tile up an image for google maps. It works great right up to the 180th meridian. That's where it introduces a transparent strip on the edge of the image. Here's the original image: http://maps.craniumjuice.com/TMXF.png Here's a screen shot showing the gap: http://maps.craniumjuice.com/gap.png If I slice up the original file using imagemagick, there's no gap at the border. It takes forever and I didn't get a screen shot. Plus the Y values are flipped so it doesn't overlay properly, it was just a proof of concept that the full image is really there, it definitely is. Any ideas what could be causing the transparent strip at the end? This gdal2tiles.py command gives me the gap from the screen shot: gdal2tiles.py -s EPSG:4326 -z 2 TMXF.png . I also tried treating it as just a raster file and got really bizarre results: gdal2tiles.py -p raster -z 2 TMXF.png . If I use an image that's the size of the original data, I don't get all the images. If I use gdal_translate to make it a 4096x4096 image, it gives me all the tiles, but they're not right either. That gives me a 64x64 image with the rest of the 256x256 of the image transparent. http://maps.craniumjuice.com/1.png I'm sure there's some setting or something I can do to get the full image tiled up with out adding these transparent stripes around the tile, I just can't find it. I'm using GDAL 1.8.0, released 2011/01/12 I appreciate any insight you might be able to give. Thanks Jerl ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev -- http://blog.klokan.cz/ http://www.maptiler.org/ http://www.oldmapsonline.org/ ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
RE: [gdal-dev] Polygonize from C# ?
I see, thanks. But since I have satellite images, this part of the doc is alarming: ...For non-thematic raster data (such as satellite images) the result will essentially be one small polygon per pixel, and memory and output layer sizes will be substantial. The algorithm is primarily intended for relatively simple thematic imagery, masks, and classification results. I just want one polygon enclosing the non-zero pixels (or alternatively, enclosing the zero pixels, then I could do a geometric difference). Is there any way to trick the method into doing that, to maybe avoid the heavy resource needs ? -Original Message- From: Even Rouault [mailto:even.roua...@mines-paris.org] Sent: Friday, April 22, 2011 11:45 AM To: Jay Jennings Cc: gdal-dev@lists.osgeo.org Subject: Re: [gdal-dev] Polygonize from C# ? Selon Jay Jennings jennings@geoeye.com: Generally, refering to the C/C++ doc is a good way of finding the info : See http://gdal.org/gdal__alg_8h.html#3f522a9035d3512b5d414fb4752671b1 Hi list, Can anyone point to any guidance or (preferably) examples on using GDAL.Polygonize() with C# bindings ? I see what the interface is, but there are some unexplained parameters, e.g. string[] options. My eventual goal is to open a raster and produce a WKT POLYGON string enclosing the good (non-NoData) area of the raster. Thanks. . Jay Jennings Senior Software Developer (NASDAQ: GEOY) jennings@geoeye.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] Polygonize from C# ?
Jay, do you basically want a footprint shape of the useful data in the Sat images (say, without the collar), or is the problem more complex, where perhaps you have a mosaic of several images and, like swiss cheese, there are no-data holes within the image? It sounds to me like you just want a footprint of the collarless area; is this correct? /Elijah Jay Jennings wrote: I see, thanks. But since I have satellite images, this part of the doc is alarming: ...For non-thematic raster data (such as satellite images) the result will essentially be one small polygon per pixel, and memory and output layer sizes will be substantial. The algorithm is primarily intended for relatively simple thematic imagery, masks, and classification results. I just want one polygon enclosing the non-zero pixels (or alternatively, enclosing the zero pixels, then I could do a geometric difference). Is there any way to trick the method into doing that, to maybe avoid the heavy resource needs ? -Original Message- From: Even Rouault [mailto:even.roua...@mines-paris.org] Sent: Friday, April 22, 2011 11:45 AM To: Jay Jennings Cc: gdal-dev@lists.osgeo.org Subject: Re: [gdal-dev] Polygonize from C# ? Selon Jay Jennings jennings@geoeye.com: Generally, refering to the C/C++ doc is a good way of finding the info : See http://gdal.org/gdal__alg_8h.html#3f522a9035d3512b5d414fb4752671b1 Hi list, Can anyone point to any guidance or (preferably) examples on using GDAL.Polygonize() with C# bindings ? I see what the interface is, but there are some unexplained parameters, e.g. string[] options. My eventual goal is to open a raster and produce a WKT POLYGON string enclosing the good (non-NoData) area of the raster. Thanks. . Jay Jennings Senior Software Developer (NASDAQ: GEOY) jennings@geoeye.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
RE: [gdal-dev] Polygonize from C# ?
Correct, we just need the footprint of the good (non-NODATA) area, which will often approximate a simple 4-point polygon with no holes. -Original Message- From: Elijah Robison [mailto:eli...@villagis.com] Sent: Friday, April 22, 2011 2:07 PM To: Jay Jennings Cc: gdal-dev@lists.osgeo.org Subject: Re: [gdal-dev] Polygonize from C# ? Jay, do you basically want a footprint shape of the useful data in the Sat images (say, without the collar), or is the problem more complex, where perhaps you have a mosaic of several images and, like swiss cheese, there are no-data holes within the image? It sounds to me like you just want a footprint of the collarless area; is this correct? /Elijah Jay Jennings wrote: I see, thanks. But since I have satellite images, this part of the doc is alarming: ...For non-thematic raster data (such as satellite images) the result will essentially be one small polygon per pixel, and memory and output layer sizes will be substantial. The algorithm is primarily intended for relatively simple thematic imagery, masks, and classification results. I just want one polygon enclosing the non-zero pixels (or alternatively, enclosing the zero pixels, then I could do a geometric difference). Is there any way to trick the method into doing that, to maybe avoid the heavy resource needs ? -Original Message- From: Even Rouault [mailto:even.roua...@mines-paris.org] Sent: Friday, April 22, 2011 11:45 AM To: Jay Jennings Cc: gdal-dev@lists.osgeo.org Subject: Re: [gdal-dev] Polygonize from C# ? Selon Jay Jennings jennings@geoeye.com: Generally, refering to the C/C++ doc is a good way of finding the info : See http://gdal.org/gdal__alg_8h.html#3f522a9035d3512b5d414fb4752671b1 Hi list, Can anyone point to any guidance or (preferably) examples on using GDAL.Polygonize() with C# bindings ? I see what the interface is, but there are some unexplained parameters, e.g. string[] options. My eventual goal is to open a raster and produce a WKT POLYGON string enclosing the good (non-NoData) area of the raster. Thanks. . Jay Jennings Senior Software Developer (NASDAQ: GEOY) jennings@geoeye.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] Polygonize from C# ?
Hi Jay, you might want to review the following thread (Get extent from rasters). Based on a cursory read of his advice, I believe Trent offers a solution that might accommodate your task: http://lists.maptools.org/pipermail/fwtools/2010-October/001886.html /Elijah Jay Jennings wrote: Correct, we just need the footprint of the good (non-NODATA) area, which will often approximate a simple 4-point polygon with no holes. -Original Message- From: Elijah Robison [mailto:eli...@villagis.com] Sent: Friday, April 22, 2011 2:07 PM To: Jay Jennings Cc: gdal-dev@lists.osgeo.org Subject: Re: [gdal-dev] Polygonize from C# ? Jay, do you basically want a footprint shape of the useful data in the Sat images (say, without the collar), or is the problem more complex, where perhaps you have a mosaic of several images and, like swiss cheese, there are no-data holes within the image? It sounds to me like you just want a footprint of the collarless area; is this correct? /Elijah Jay Jennings wrote: I see, thanks. But since I have satellite images, this part of the doc is alarming: ...For non-thematic raster data (such as satellite images) the result will essentially be one small polygon per pixel, and memory and output layer sizes will be substantial. The algorithm is primarily intended for relatively simple thematic imagery, masks, and classification results. I just want one polygon enclosing the non-zero pixels (or alternatively, enclosing the zero pixels, then I could do a geometric difference). Is there any way to trick the method into doing that, to maybe avoid the heavy resource needs ? -Original Message- From: Even Rouault [mailto:even.roua...@mines-paris.org] Sent: Friday, April 22, 2011 11:45 AM To: Jay Jennings Cc: gdal-dev@lists.osgeo.org Subject: Re: [gdal-dev] Polygonize from C# ? Selon Jay Jennings jennings@geoeye.com: Generally, refering to the C/C++ doc is a good way of finding the info : See http://gdal.org/gdal__alg_8h.html#3f522a9035d3512b5d414fb4752671b1 Hi list, Can anyone point to any guidance or (preferably) examples on using GDAL.Polygonize() with C# bindings ? I see what the interface is, but there are some unexplained parameters, e.g. string[] options. My eventual goal is to open a raster and produce a WKT POLYGON string enclosing the good (non-NoData) area of the raster. Thanks. . Jay Jennings Senior Software Developer (NASDAQ: GEOY) jennings@geoeye.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] Polygonize from C# ?
Jay, I made the plugin for QGIS, where, calculate the boundary of image with pixel value upper to zero, i believe is what you want, footprint shape. The plugin read all images of directories and create one vector layer with all boundary of images. For calculate, the background of image need have pixel value equal a zero. I wrote the program with Python, but, i called the GDAL functions for calculus. The name of plugin is Image Boundary, and you can install inside QGIS(contributed repository), or read the source by http://spatialserver.net/pyqgis_1.0/contributed/imgboundary.zip Regards, Luiz Motta 2011/4/22 Jay Jennings jennings@geoeye.com: Correct, we just need the footprint of the good (non-NODATA) area, which will often approximate a simple 4-point polygon with no holes. -Original Message- From: Elijah Robison [mailto:eli...@villagis.com] Sent: Friday, April 22, 2011 2:07 PM To: Jay Jennings Cc: gdal-dev@lists.osgeo.org Subject: Re: [gdal-dev] Polygonize from C# ? Jay, do you basically want a footprint shape of the useful data in the Sat images (say, without the collar), or is the problem more complex, where perhaps you have a mosaic of several images and, like swiss cheese, there are no-data holes within the image? It sounds to me like you just want a footprint of the collarless area; is this correct? /Elijah Jay Jennings wrote: I see, thanks. But since I have satellite images, this part of the doc is alarming: ...For non-thematic raster data (such as satellite images) the result will essentially be one small polygon per pixel, and memory and output layer sizes will be substantial. The algorithm is primarily intended for relatively simple thematic imagery, masks, and classification results. I just want one polygon enclosing the non-zero pixels (or alternatively, enclosing the zero pixels, then I could do a geometric difference). Is there any way to trick the method into doing that, to maybe avoid the heavy resource needs ? -Original Message- From: Even Rouault [mailto:even.roua...@mines-paris.org] Sent: Friday, April 22, 2011 11:45 AM To: Jay Jennings Cc: gdal-dev@lists.osgeo.org Subject: Re: [gdal-dev] Polygonize from C# ? Selon Jay Jennings jennings@geoeye.com: Generally, refering to the C/C++ doc is a good way of finding the info : See http://gdal.org/gdal__alg_8h.html#3f522a9035d3512b5d414fb4752671b1 Hi list, Can anyone point to any guidance or (preferably) examples on using GDAL.Polygonize() with C# bindings ? I see what the interface is, but there are some unexplained parameters, e.g. string[] options. My eventual goal is to open a raster and produce a WKT POLYGON string enclosing the good (non-NoData) area of the raster. Thanks. . Jay Jennings Senior Software Developer (NASDAQ: GEOY) jennings@geoeye.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] Extract Extent or Bounding Box for a subset of shapes for a shapefile
Luca,
You can also loop through the features with relatively simple Python
code to get the extents. See sample below (adapt at will):
def findPoints(geometry, results):
for i in range(geometry.GetPointCount()):
x,y,z = geometry.GetPoint(i)
if results['north'] == None or results['north'][1] y:
results['north'] = (x,y)
if results['south'] == None or results['south'][1] y:
results['south'] = (x,y)
if results['east'] == None or results['east'][0] x:
results['east'] = (x,y)
if results['west'] == None or results['west'][0] x:
results['west'] = (x,y)
for i in range(geometry.GetGeometryCount()):
findPoints(geometry.GetGeometryRef(i), results)
inSHP = 'test.shp'
shapefile = osgeo.ogr.Open(inSHP)
layer = shapefile.GetLayer(0)
for feat in range(layer.GetFeatureCount()):
feature = layer.GetFeature(feat)
geometry = feature.GetGeometryRef()
results = {'north' : None, 'south' : None, 'east' : None, 'west' :
None}
findPoints(geometry, results)
-marius
On Fri, 2011-04-22 at 17:39 +0200, Luca Sigfrido Percich wrote:
Thank you Chaitanya.
I think that this makes great sense when dealing with a summary of the
whole layer, especially because a lot of formats store the extent in the
layer metadata/header.
But if I need to dump all the features, or to get a dump or summary of a
filtered set of features (in which case I presume ogr will scan all the
features to apply the filter), checking for boundary limits shouldn't
add much cost to the already expensive operation.
Probably this goes beyond the intended scope of ogrinfo. And Matthew's
workaround works fine.
Thanks again
Sig
Il giorno ven, 22/04/2011 alle 20.20 +0530, Chaitanya kumar CH ha
scritto:
Sig,
ogrinfo doesn't force the recomputation of extent. It is considered as
a costly operation. ogrinfo just reports the stored extent.
Whereas in ogr2ogr, creating a new file automatically computes the
extents.
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