Hello Jody,
I even tested with GeoTools v29-snapshot with this code below and it
returned size 18 x 5 instead of 17 x 3 for gdal_translate or 17 x 4 for
geoserver WCS GetCoverage.
I thought using geotools should yield the same result as geoserver WCS
GetCoverage, but it is not.
Do you have any suggestions for the code before?
File file = new File("/home/aaa/Downloads/temp/test.tif");
Hints hint = new Hints();
hint.put(Hints.DEFAULT_COORDINATE_REFERENCE_SYSTEM, WGS84);
hint.put(Hints.FORCE_LONGITUDE_FIRST_AXIS_ORDER, Boolean.TRUE);
GeoTiffReader reader = new GeoTiffReader(file, hint);
GridCoverage2D coverage = reader.read(null);
CoverageProcessor processor = CoverageProcessor.getInstance();
final ParameterValueGroup param =
processor.getOperation("CoverageCrop").getParameters();
// 137.915315044103 -36.51629558851893 154.64770004642423
-40.081875882617666
double minLong = 137.915315044103;
double maxLong = 154.64770004642423;
double minLat = -40.081875882617666;
double maxLat = -36.51629558851893;
final GeneralEnvelope crop = new GeneralEnvelope(new
GeographicBoundingBoxImpl(minLong, maxLong,
minLat, maxLat));
ReferencedEnvelope envelope = new ReferencedEnvelope(new
Envelope(minLong, maxLong,
minLat, maxLat), WGS84);
param.parameter("Source").setValue(coverage);
param.parameter("Envelope").setValue(envelope);
GridCoverage2D cropped = (GridCoverage2D) processor.doOperation(param);
GridCoverageFactory gcf = new GridCoverageFactory();
GridCoverage2D gc = gcf.create("name",
cropped.getRenderedImage(), cropped.getEnvelope());
String url = "/tmp/geotools.tif";
File outputFile = new File(url);
GeoTiffWriter writer = new GeoTiffWriter(outputFile);
writer.write(gc, null);
writer.dispose();
gdalinfo /tmp/geotools.tif
Size is 18, 5
On Mon, 3 Apr 2023 at 16:08, Jody Garnett <jody.garn...@gmail.com> wrote:
> To our request defines the grid locations, you may have to read the
> standard to determine exactly how the grid is defined for your request.
> The standard is available on the OGC website.
>
> Thanks
>
> On Mon, Apr 3, 2023 at 7:00 AM Pham Huu Bang <a09...@gmail.com> wrote:
>
>> Hello Jody,
>>
>> >I find WCS tricky to use, did you use the WCS Request Builder to produce
>> your curl command?
>> No, I didn't use any tool for that. The parameters in curl command are
>> standard WCS 2.0.1 GetCoverage request.
>>
>> >One thing I could not determine from your curl example is what what
>> target coverage layout is being used (which is probably what your question
>> is about). I am not sure if WCS 2 allows you to specify that manually or
>> not.
>> I'm not sure about this either. I used only standard parameters request
>> for WCS GetCoverage.
>>
>> >Given your raster contains both shifted pixels and one additional row
>> than anticipated by gdal. This may be a difference between sampling at the
>> grid locations defined (WCS), rather that defining a grid of pixels and
>> sampling in the middle of each pixel defined (gdal)?
>> I'm not sure about this either. I used GeoServer normally to create a
>> data source as one TIFF file, then published it as a Layer and I didn't
>> define any grid locations.
>>
>> On Mon, 3 Apr 2023 at 15:56, Jody Garnett <jody.garn...@gmail.com> wrote:
>>
>>> I find WCS tricky to use, did you use the WCS Request Builder to produce
>>> your curl command?
>>>
>>> One thing I could not determine from your curl example is what what
>>> target coverage layout is being used (which is probably what your question
>>> is about). I am not sure if WCS 2 allows you to specify that manually or
>>> not.
>>>
>>> Given your raster contains both shifted pixels and one additional row
>>> than anticipated by gdal. This may be a difference between sampling at the
>>> grid locations defined (WCS), rather that defining a grid of pixels and
>>> sampling in the middle of each pixel defined (gdal)?
>>>
>>> Jody
>>>
>>> On Mon, Apr 3, 2023 at 5:48 AM Pham Huu Bang <a09...@gmail.com> wrote:
>>>
>>>> Hello,
>>>>
>>>> I've a hard time understanding which one should be the correct result
>>>> by gdal_translate or GeoServer.
>>>>
>>>> My system (Ubuntu 22.04) has:
>>>> - GDAL 3.4.1
>>>> - Geoserver 2.22 running on Tomcat on port 9090
>>>>
>>>> I have a small tiff file (link to download at the bottom of this
>>>> thread) in EPSG:4326, then I wanted to have a small subset on Lat and Long
>>>> axes from it by running:
>>>>
>>>> - gdal_translate -projwin 137.915315044103 -36.51629558851893
>>>> 154.64770004642423 -40.081875882617666 test.tif gdal.tif
>>>>
>>>>
>>>> - curl '
>>>> http://localhost:9090/geoserver/wcs?service=WCS&version=2.0.1&request=GetCoverage&format=image/tiff&coverageId=test_raster:output&subset=Lat(-40.081875882617666,-36.51629558851893)&subset=Long(137.915315044103,154.64770004642423)'
>>>> -o geoserver.tiff
>>>>
>>>> - Then gdalinfo gdal.tif returns:
>>>>
>>>> Size is 17, 4
>>>>
>>>> and gdalinfo geoserver.tif returns
>>>>
>>>> Size is 17, 3
>>>>
>>>> - Also the geo bbox of gdal.tif and geoserver.tif are different.
>>>> First file gives:
>>>>
>>>> Upper Left ( 136.9750000, -35.9750000)
>>>>
>>>> Second file gives:
>>>>
>>>> Upper Left ( 137.9750000, -36.9750000)
>>>>
>>>>
>>>> More importantly, the pixels are shifted from gdal.tif at the top to
>>>> geoserver.tif at the bottom which you can see from this image:
>>>> https://imgur.com/a/L0vKvYk
>>>>
>>>> Here is the link to download test.tif, gdal.tif and geoserver.tif
>>>> https://drive.google.com/file/d/1dawCy38FMwx4J7OQsky-gAHHOXsMuDcy/view?usp=sharing
>>>>
>>>> Please share your opinion which result (gdal.tif or geoserver.tif)
>>>> should be correct?
>>>>
>>>> Thanks,
>>>>
>>>> _______________________________________________
>>>> Geoserver-users mailing list
>>>>
>>>> Please make sure you read the following two resources before posting to
>>>> this list:
>>>> - Earning your support instead of buying it, but Ian Turton:
>>>> http://www.ianturton.com/talks/foss4g.html#/
>>>> - The GeoServer user list posting guidelines:
>>>> http://geoserver.org/comm/userlist-guidelines.html
>>>>
>>>> If you want to request a feature or an improvement, also see this:
>>>> https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer
>>>>
>>>>
>>>> Geoserver-users@lists.sourceforge.net
>>>> https://lists.sourceforge.net/lists/listinfo/geoserver-users
>>>>
>>> --
>>> --
>>> Jody Garnett
>>>
>> --
> --
> Jody Garnett
>
_______________________________________________
Geoserver-users mailing list
Please make sure you read the following two resources before posting to this
list:
- Earning your support instead of buying it, but Ian Turton:
http://www.ianturton.com/talks/foss4g.html#/
- The GeoServer user list posting guidelines:
http://geoserver.org/comm/userlist-guidelines.html
If you want to request a feature or an improvement, also see this:
https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer
Geoserver-users@lists.sourceforge.net
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