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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Hi Javier,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Thanks! That helps:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Consolas;mso-fareast-language:EN-US">(echo 150717.96 489970.61 & echo 150857.90 509969.45) | cct -d 2 -z 0 +proj=horner +deg=3 +fwd_origin=0,0 +fwd_u=+120025.8705,+0.999986846,-0.0250515e-8,+0.1471965e-14,+0.006918172,-0.0860518e-8,-0.0398590e-14,+0.0011249e-8,+0.4556545e-14,+0.1991105e-14
+fwd_v=+390181.7849,+0.999993024,-0.0338879e-8,+0.1184845e-14,-0.006907254,-0.0492600e-8,-0.1945916e-14,+0.0222878e-8,+0.9244571e-14,-0.1091684e-14 +inv_tolerance=0.001 +inv
<b>+range=600000</b> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Consolas;mso-fareast-language:EN-US"> 30000.00 100000.00 0.00 inf<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Consolas;mso-fareast-language:EN-US"> 30000.00 120000.00 0.00 inf<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">I did try specifying the range before, but I did not try such a large value. Due to the word “radius” in the description at
</span><a href="https://proj.org/en/stable/operations/transformations/horner.html#cmdoption-arg-range">https://proj.org/en/stable/operations/transformations/horner.html#cmdoption-arg-range</a> I expected the range value to specify a circle instead of a box.
More importantly, I expected it to apply on the input coordinates in the forward transformation and the output coordinates in the inverse transformation. I think the latter would make more sense, as that would mean one can use the same +range for the forward
and inverse transformation. Therefore I would like to suggest a change in the code instead of only making the documentation more comprehensive.<span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Jochem<o:p></o:p></span></p>
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