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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I think that it depends on the file format. Rather often it is set to zero but I have seen NaN in many places. However, shapefiles explicitly denies NaN<br>
<br>
“…</span><span lang="EN-US">Positive infinity, negative infinity, and Not-a-Number (NaN) values are not allowed in shapefiles. Nevertheless, shapefiles support the concept of "no data" values, but they are currently used only for measures. Any floating point
number smaller than –1038 is considered by a shapefile reader to represent a "no data" value.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">With the SQLite dialect it is possible to select the value but NaN is not accepted.<br>
Can be tested with<br>
ogrinfo -dialect SQLite -sql "select CastToXYZ(ST_GeomFromText('POINT (1 2)'),3)" point.json<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal">-Jukka Rahkonen-<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="mso-fareast-language:FI">Lähettäjä:</span></b><span style="mso-fareast-language:FI"> gdal-dev <gdal-dev-bounces@lists.osgeo.org>
<b>Puolesta </b>Abel Pau via gdal-dev<br>
<b>Lähetetty:</b> torstai 25. tammikuuta 2024 19.07<br>
<b>Vastaanottaja:</b> gdal-dev@lists.osgeo.org<br>
<b>Aihe:</b> [gdal-dev] vector NODATA for Z values?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">there is any value in GDAL for VECTORS that indicates that a concrete value of a Z is not known (z nodata value)?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I couldn’t find it anywhere.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In MiraMon format we use one concrete number documented in our format pdf (</span><span lang="CA" style="font-size:12.0pt;font-family:"Courier New"">-1.0E+300</span><span lang="EN-US">) an in the driver it’s planned to
translate it to the same number. I could translate it to the one I am asking. And the same for detecting nodata Z and translate them to
</span><span lang="CA" style="font-size:12.0pt;font-family:"Courier New"">-1.0E+300
</span><span lang="EN-US">when reading another format.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:CA"> </span><span lang="CA" style="mso-fareast-language:CA"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#003300;mso-fareast-language:CA">Abel Pau Garcia</span></b><span lang="EN-US" style="font-size:12.0pt;mso-fareast-language:CA">
</span><span lang="EN-US" style="mso-fareast-language:CA"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#669900;mso-fareast-language:CA">GIS developer</span></b><span lang="EN-US" style="mso-fareast-language:CA"><o:p></o:p></span></p>
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