[gdal-dev] Image reprojection with GDALWARP

[Elena Ruiz]

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
Zoom of image destination: 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
________________________________

[https://www.aplitop.com/descargas/firma1.jpg]


Elena Ruiz
Sofware Development & Technical Support
Tel. +34 952 43 97 71
eruiz at aplitop.com
Sumatra, 9 - 29190 M?laga (Spain)
www.aplitop.com

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