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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">Hi there,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">I have been experimenting with Gdal 2.2-dev as of generating GeoPdf files.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">All of what I have been trying out seems to be working just fine:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">Stacking of multiple raster-layers<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">Stacking of multiple vector-layers (with attribute-info)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">Though, I have some comments/objections:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">When generating a PDF one would expect that it should be possible to control the actual size (in paper-units) of the actually produced PDF.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">This will allow for one to do “Print In Actual Size” from Adobe Acrobat Reader yielding a true-scale print (say 1:500).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">It would also be nice, if a preferred paper-unit could be specified up front (inch, cm, mm). This could allow for a more precise mappings to A-formats (which I
believe are inherent in PDF).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">Currently (as of GDAL 2.2dev) the paper-unit-type is always “inch”, and the actual size (internal properties of PDF) can only be controlled by letting the bottom-most
raster layer presented to gdal_translate have a pixel-size corresponding exactly to the user-unit size (1/72 inch) of the desired PDF paper-size.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">I suggest, that gdal_translate should treat a DPI-setting literally: The DPI setting should apply to the bottom raster-layer. All other raster/vector layers are
to be mapped to that “media-box”.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">As of WRITE_USERUNIT it is only to provide for a mean to “scale” the resolution. It should be a scale value, to be applied to the default USER_UNIT value of PDF
(1/72 inch).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif">Aron<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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