[gdal-dev] Image reprojection with GDALWARP

[Even Rouault]

Try adding -r bilinear or -r bicubic. By default gdalwarp performs 
nearest resampling which is rarely what you need for high quality results

Le 01/02/2023 à 16:44, Elena Ruiz a écrit :
>
> Hi, I'm trying to reproject images from WGS 84 / Pseudo-Mercator 
> EPSG:3857 to ED50 / UTM zone 30N EPSG:23030, but the resulting image 
> doesn't adapt well to drawing. I will explain it in more detail so 
> that you understand:
>
> I have an image in EPSG:3857, the result of a WMTS service, and a 
> drawing in the same SRS, as you can see in the image the drawing 
> matches the image perfectly.
>
> Image source with drawing: 
> https://aplitop.sharefile.com/d-s4d6dcf6d8ff34023a8b6e95277519c56
>
> I want to convert the previous image to EPSG:23030 and I have used 
> gdalwarp command with different parameters and I get the same result :
>
> 1/.gdalwarp -s_srs EPSG:3857 -t_srs EPSG:23030 -co "TFW=YES" 
> -overwrite "C:\Users\elena\Downloads\Nueva carpeta\imagen_t.tif" 
> "C:\Users\elena\Downloads\Nueva carpeta\nueva_6.tif"/
>
> 2./gdalwarp -s_srs EPSG:3857 -t_srs EPSG:23030 -te 335000 4084501.25 
> 335550 4084848.75 -co "TFW=YES" -overwrite 
> "C:\Users\elena\Downloads\Nueva carpeta\imagen_t.tif" 
> "C:\Users\elena\Downloads\Nueva carpeta\nueva_6.tif"/
>
> //
>
> And the resulting image, in addition to noticing that the road is 
> distorted (like a staircase effect), does not match the drawing.
>
> Image destination with drawing: 
> https://aplitop.sharefile.com/d-s98f76513feb34c268764c0492ccb40d3 
> <https://aplitop.sharefile.com/d-s98f76513feb34c268764c0492ccb40d3>
>
> Zoom of image destination: 
> https://aplitop.sharefile.com/d-sf9a270a9300e4ac796eddeac7131a058 
> <https://aplitop.sharefile.com/d-sf9a270a9300e4ac796eddeac7131a058>
>
> I have also done the test from EPSG:23030 to EPSG:25830 and it does 
> not do well either.
>
> I am using the version of gdal 2.4.4 for x64, this is the link to 
> download the source and destination image: 
> https://aplitop.sharefile.com/d-sdae2552bd2054fdf8cc29ce5b559e278 , I 
> hope someone can help me and tell me if there is something wrong. Regards
>
> ------------------------------------------------------------------------
>
> 	
> *Elena Ruiz *
> Sofware Development & Technical Support
> Tel. +34 952 43 97 71
> eruiz at aplitop.com
> Sumatra, 9 - 29190 Málaga (Spain)
> *www.aplitop.com
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-- 
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