[gdal-dev] WMS, blocksize and black lines

[Arno Gerretsen]

Chris,

Thanks for the answer, if I put the window in the XML file it indeed 
also works for me.

But in my application I am sampling the GDAL dataset from code and 
setting a different window each time from code as well. So to modify the 
WMS XML every time in that case would not really be a work able 
solution.

This approach worked fine in the past with another WMS server, so I was 
hoping I missed some setting somewhere or so. I'll do some more 
experimentation.

Arno


On 2018-07-10 07:04, Chris Smemoe wrote:
> Arno,
> 
> I suspect the black lines has something to do with using the -projwin
> argument to gdal_translate along with the DataWindow tag information in 
> the
> XML file.  The following XML works fine for me with the following 
> command
> line: "gdal_translate wms.xml test.tif"
> 
> <GDAL_WMS>
>    <Service name="WMS">
>      <Version>1.1.1</Version>
> 
> <ServerUrl>https://gis.apfo.usda.gov/arcgis/services/NAIP/Illinois/ImageServ
> er/WMSServer</ServerUrl>
>      <ImageFormat>tiff</ImageFormat>
>      <Layers>0</Layers>
>      <BBoxOrder>xyXY</BBoxOrder>
>      <SRS>EPSG:4326</SRS>
>    </Service>
>    <DataWindow>
>      <UpperLeftX>-89.0</UpperLeftX>
>      <UpperLeftY>42.0</UpperLeftY>
>      <LowerRightX>-88.0</LowerRightX>
>      <LowerRightY>41.0</LowerRightY>
>      <SizeX>1024</SizeX>
>      <SizeY>1024</SizeY>
>    </DataWindow>
>    <UnsafeSSL>true</UnsafeSSL>
> </GDAL_WMS>
> 
> Chris
> 
> -----Original Message-----
> From: gdal-dev [mailto:gdal-dev-bounces at lists.osgeo.org] On Behalf Of 
> Arno
> Gerretsen
> Sent: Monday, July 09, 2018 12:01 PM
> To: gdal-dev at lists.osgeo.org
> Subject: [gdal-dev] WMS, blocksize and black lines
> 
> Hi all,
> 
> I'm trying to create a WMS XML to access some WMS data in GDAL. But I
> get black lines in the resulting image. I have found out that if I
> reduce the size of the BlockSize in the WMS XML that the lines get more
> narrow, but the download speed of the images also reduces a lot. Am I
> missing some setting here to make it work?
> 
> This is the XML file I use:
> 
> <GDAL_WMS>
>    <Service name="WMS">
>      <Version>1.1.1</Version>
> 
> <ServerUrl>https://gis.apfo.usda.gov/arcgis/services/NAIP/Illinois/ImageServ
> er/WMSServer?SERVICE=WMS</ServerUrl>
>      <Layers>0</Layers>
>      <SRS>EPSG:4326</SRS>
>      <ImageFormat>image/tiff</ImageFormat>
>      <Transparent>FALSE</Transparent>
>      <BBoxOrder>xyXY</BBoxOrder>
>    </Service>
>    <DataWindow>
>      <UpperLeftX>-91.562525</UpperLeftX>
>      <UpperLeftY>42.562525</UpperLeftY>
>      <LowerRightX>-87.437470</LowerRightX>
>      <LowerRightY>36.937474</LowerRightY>
> 	<SizeX>370834</SizeX>
>      <SizeY>625056</SizeY>
>    </DataWindow>
>    <BandsCount>4</BandsCount>
>    <UnsafeSSL>true</UnsafeSSL>
>    <BlockSizeX>1024</BlockSizeX>
>    <BlockSizeY>1024</BlockSizeY>
> </GDAL_WMS>
> 
> And this is a sample call that shows the black lines:
> 
> gdal_translate -projwin -88.0 42.0 -87.99 41.99 wms.xml test.tif
> 
> With regards,

-- 
Arno