<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div><br></div><div>Hi Even</div><div><br data-mce-bogus="1"></div><div>Thanks for your kind and developed answer.</div><div>I've tried with the EPSG equivalents: (<a href="https://www.sandre.eaufrance.fr/jeu-de-donnees/projection-des-coordonnées?lang=fr">https://www.sandre.eaufrance.fr/jeu-de-donnees/projection-des-coordonnées?lang=fr</a>) </div><div><br data-mce-bogus="1"></div><div><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures;" data-mce-style="font-variant-ligatures: no-common-ligatures;">echo 0<span class="Apple-converted-space"> </span>56.000000 0<span class="Apple-converted-space"> </span>| ./cs2cs +from EPSG:4807 +to EPSG:3034</span></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures;" data-mce-style="font-variant-ligatures: no-common-ligatures;"></span><br></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;" data-mce-style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;">But the result doesn't make any sense:</span></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;" data-mce-style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;"></span><br></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures;" data-mce-style="font-variant-ligatures: no-common-ligatures;">-1640975.39<span class="Apple-tab-span" style="white-space: pre;" data-mce-style="white-space: pre;"> </span>10099142.17 0.00</span></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures;" data-mce-style="font-variant-ligatures: no-common-ligatures;"></span><br></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;" data-mce-style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;">Is there something with the units that is not correct maybe?</span></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;" data-mce-style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;"></span><br></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;" data-mce-style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;"></span><br></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;" data-mce-style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;">This works well:</span></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures;" data-mce-style="font-variant-ligatures: no-common-ligatures;"><span class="Apple-converted-space"> </span>echo 0<span class="Apple-converted-space"> </span>56.000000 0<span class="Apple-converted-space"> </span>| PROJ_NETWORK=ON ./cs2cs -d 3<span class="Apple-converted-space"> </span>"NTF geographiques Paris (gr) + NGF-IGN69 height" IGNF:ETRS89LCC --3d<span class="Apple-converted-space"> </span></span></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures;" data-mce-style="font-variant-ligatures: no-common-ligatures;"><span class="Apple-converted-space"></span></span><br></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><br data-mce-bogus="1"></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;" data-mce-style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;">and I have a few questions about it:</span></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;" data-mce-style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;"><br data-mce-bogus="1"></span></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;" data-mce-style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;">1) the result remains unchanged if I remove or put <span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-size: 12pt; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" data-mce-style="caret-color: #000000; color: #000000; font-size: 12pt; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; float: none; display: inline !important;">PROJ_NETWORK to OFF. What does it do exactly?</span></span></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;" data-mce-style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;"><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-size: 12pt; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" data-mce-style="caret-color: #000000; color: #000000; font-size: 12pt; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; float: none; display: inline !important;"><br>2) Does the string<span style="font-family: arial, helvetica, sans-serif;" data-mce-style="font-family: arial, helvetica, sans-serif;"> "<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" data-mce-style="caret-color: #000000; color: #000000; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; float: none; display: inline !important;">NTF geographiques Paris (gr) + NGF-IGN69 height" correspond to an entry in the CRS database proj.db or is it interpreted as a compounded system because PROJ parses the string? There is no simple code like EPSG or IGNF related to it? Can we create one easily?</span></span></span></span></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;" data-mce-style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;"><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-size: 12pt; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" data-mce-style="caret-color: #000000; color: #000000; font-size: 12pt; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; float: none; display: inline !important;"><span style="font-family: arial, helvetica, sans-serif;" data-mce-style="font-family: arial, helvetica, sans-serif;"><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" data-mce-style="caret-color: #000000; color: #000000; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; float: none; display: inline !important;"><br data-mce-bogus="1"></span></span></span></span></p><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;" data-mce-style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;"><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-size: 12pt; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" data-mce-style="caret-color: #000000; color: #000000; font-size: 12pt; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; float: none; display: inline !important;"><span style="font-family: arial, helvetica, sans-serif;" data-mce-style="font-family: arial, helvetica, sans-serif;"><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" data-mce-style="caret-color: #000000; color: #000000; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; float: none; display: inline !important;">3) Where can I see where this crs"NTF geographiques Paris (gr) + NGF-IGN69 height"<span class="Apple-converted-space"> is</span></span></span></span></span><span style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;" data-mce-style="caret-color: #000000; color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;"><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-size: 12pt; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" data-mce-style="caret-color: #000000; color: #000000; font-size: 12pt; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; float: none; display: inline !important;"><span style="font-family: arial, helvetica, sans-serif;" data-mce-style="font-family: arial, helvetica, sans-serif;"><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" data-mce-style="caret-color: #000000; color: #000000; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none; float: none; display: inline !important;"> defined in the sql commands used to build it? </span></span></span></span></p><div style="clear: both;" data-mce-style="clear: both;"><br></div><div style="clear: both;" data-mce-style="clear: both;"><br></div><div style="clear: both;" data-mce-style="clear: both;">Nicolas Bellaiche </div><div style="clear: both;" data-mce-style="clear: both;"><br></div><div style="clear: both;" data-mce-style="clear: both;"><br></div><p style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 0, 0);" data-mce-style="margin: 0px; font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; color: #000000;"><span style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;" data-mce-style="font-variant-ligatures: no-common-ligatures; font-family: arial, helvetica, sans-serif; font-size: 12pt;"></span><br></p></div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>De: </b>"Even Rouault" <even.rouault@spatialys.com><br><b>À: </b>"Nicolas Bellaiche" <nicolas.bellaiche@ign.fr>, "proj" <PROJ@lists.osgeo.org><br><b>Envoyé: </b>Dimanche 18 Février 2024 15:16:44<br><b>Objet: </b>Re: [PROJ] Help needed for a cs2cs pipeline with shift grids<br></div><div><br><style>/*<![CDATA[*/p.p1 {
margin: 0.0px 0.0px 0.0px 0.0px;
font: 15.0px Menlo;
color: rgb(0,0,0);
background-color: rgb(255,255,255);
}
span.Apple-tab-span {
white-space: pre;
}
/*]]>*/</style></div><div data-marker="__QUOTED_TEXT__"><p>Nicolas,</p>
<p>I believe the Helmert transformation is used when using IGNF
codes, because the IGNF database has only recorded the use of the
ntf_r93 grid for NTF to RGF93, but not for NTF to ETRS89 (by the
way, just reiterating that IGN is more than welcome to take over
on maintenance & updates of the IGNF part of the PROJ
database). And when transforming between 2 IGNF codes, PROJ by
default will only consider transformations in the IGNF domain. But
if you use EPSG codes, then ntf_r93 is available to transforme
between NTF and ETRS89.</p>
<p>To get a vertical transformation, you also need to use 3D CRS.<br>
</p>
<p>For example<br>
</p>
<p>projinfo -s "NTF geographiques Paris (gr) + NGF-IGN69 height" -t
IGNF:ETRS89LCC --3d --spatial-test intersects <br>
</p>
<p>reports the following pipeline:<br>
</p>
<p>unknown id, axis order change (2D) + NTF (Paris) to NTF (1) + NTF
to RGF93 v1 (1) + Inverse of RGF93 v1 to NGF-IGN69 height (1) +
RGF93 v1 to ETRS89 (1) + axis order change (geographic3D
horizontal) + ETRS89 LAMBERT CONFORMAL CONIC, 1.6 m, France -
mainland onshore., at least one grid missing<br>
<br>
PROJ string:<br>
+proj=pipeline<br>
+step +proj=unitconvert +xy_in=grad +xy_out=rad<br>
+step +inv +proj=longlat +ellps=clrk80ign +pm=paris<br>
+step +proj=push +v_3<br>
+step +proj=cart +ellps=clrk80ign<br>
+step +proj=xyzgridshift +grids=fr_ign_gr3df97a.tif
+grid_ref=output_crs<br>
+ellps=GRS80<br>
+step +inv +proj=cart +ellps=GRS80<br>
+step +proj=pop +v_3<br>
+step +proj=vgridshift +grids=fr_ign_RAF18.tif +multiplier=1<br>
+step +proj=lcc +lat_0=52 +lon_0=10 +lat_1=35 +lat_2=65
+x_0=4000000<br>
+y_0=2800000 +ellps=GRS80<br>
</p>
<p><br>
</p>
<p>Here, as there's a mix of objects from different authorities
(IGNF and EPSG), then EPSG transformations are considered, hence
you get the gr3df97a grid.<br>
</p>
<p>$ echo 0 56.000000 0 | PROJ_NETWORK=ON bin/cs2cs -d 3 "NTF
geographiques Paris (gr) + NGF-IGN69 height" IGNF:ETRS89LCC --3d <br>
3474789.997 2655359.291 43.644</p>
<p>which is the application of the above pipeline:<br>
</p>
<p>$ echo 0 56.000000 0 | PROJ_NETWORK=ON bin/cct -d 3
+proj=pipeline +step +proj=unitconvert +xy_in=grad +xy_out=rad
+step +inv +proj=longlat +ellps=clrk80ign +pm=paris +step
+proj=push +v_3 +step +proj=cart +ellps=clrk80ign +step
+proj=xyzgridshift +grids=fr_ign_gr3df97a.tif +grid_ref=output_crs
+ellps=GRS80 +step +inv +proj=cart +ellps=GRS80 +step +proj=pop
+v_3 +step +proj=vgridshift +grids=fr_ign_RAF18.tif +multiplier=1
+step +proj=lcc +lat_0=52 +lon_0=10 +lat_1=35 +lat_2=65
+x_0=4000000 +y_0=2800000 +ellps=GRS80<br>
<br>
</p>
<p>If you want to get exactly the below pipeline, you'll have to
tweak proj.db to create a compound CRS for "NTF geographiques
Paris (gr) + NGF-IGN69 height", and then create a custom record in
other_transformation for the transformation between this compound
CRS and (a 3D projected CRS derived from) IGNF:ETRS89LCC. Cf
data/sql/other_transformation_custom.sql for potential inspiration</p>
<p>Even<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Le 15/02/2024 à 19:46, Nicolas
Bellaiche via PROJ a écrit :<br>
</div>
<blockquote>
<div style="font-family:'arial' , 'helvetica' , sans-serif;font-size:12pt;color:#000000">
<div>
<style>/*<![CDATA[*/p.p1 {
margin: 0.0px 0.0px 0.0px 0.0px;
font: 11.0px Menlo;
color: rgb(0,0,0);
}
span.s1 {
}
/*]]>*/</style></div>
<div>
<style>/*<![CDATA[*/p.p1 {
margin: 0.0px 0.0px 0.0px 0.0px;
font: 11.0px Menlo;
color: rgb(0,0,0);
}
span.s1 {
}
span.Apple-tab-span {
white-space: pre;
}
/*]]>*/</style>
<style>/*<![CDATA[*/p.p1 {
margin: 0.0px 0.0px 0.0px 0.0px;
font: 11.0px Menlo;
color: rgb(0,0,0);
}
span.s1 {
}
/*]]>*/</style></div>
<div>
<style>/*<![CDATA[*/p.p1 {
margin: 0.0px 0.0px 0.0px 0.0px;
font: 11.0px Menlo;
color: rgb(0,0,0);
}
span.s1 {
}
/*]]>*/</style></div>
<div>
<style>/*<![CDATA[*/p.p1 {
margin: 0.0px 0.0px 0.0px 0.0px;
font: 15.0px Menlo;
color: rgb(93,108,121);
background-color: rgb(255,255,255);
}
/*]]>*/</style></div>
<div>Hi there,</div>
<div><br>
</div>
<div>I try to make a conversion using shiftgrids from IGNF: NTFP
to IGNF:ETRS89LCC. By default, it seems that it uses the
helmert approximation between the 2 crs and i cannot figure
out how to use the grid fr_ign_ntf_r93.</div>
<div><br>
</div>
<div>So far i've found how to create a pipeline that works with
cct, but i'd like to have a code that represents the crs and
be able to go to different destination crs with the cs2cs
application. Any idea?</div>
<div><br>
</div>
<div><span style="color:#5d6c79;font-family:'menlo';font-size:15px;font-style:normal;font-weight:400;letter-spacing:normal;text-indent:0px;text-transform:none;word-spacing:0px;white-space:normal;background-color:#ffffff;display:inline !important;float:none">(helmert
approx + no geoid with the standard codes)</span></div>
<div>
<p class="p1" style="margin:0px"><span class="s1">echo 0 56<span class="Apple-converted-space"> </span>0 | ./cs2cs<span class="Apple-converted-space"> </span>+ from IGNF:NTFP<span class="Apple-converted-space"> </span>+to
IGNF:ETRS89LCC </span></p>
<p class="p1" style="margin:0px"><span class="s1">result : </span><span class="s1">3474788.21<span class="Apple-tab-span"> </span>2655358.23
0.00</span></p>
<p class="p1" style="margin:0px"><span class="s1"></span><br>
</p>
<p class="p1" style="margin:0px"><span class="s1">(correct
pipeline)</span></p>
<p class="p1" style="margin:0px"><span class="s1">echo 0
56.000000 0 | PROJ_DEBUG=3 ./cct +proj=pipeline +step
+proj=unitconvert +xy_in=grad +xy_out=rad +step +inv
+proj=longlat +ellps=clrk80ign +pm=paris +step
+proj=hgridshift +grids=fr_ign_ntf_r93.tif +step +inv
+proj=vgridshift +grids=RAF09.gtx +step +proj=lcc
+lat_0=52 +lon_0=10 +lat_1=35 +lat_2=65 +x_0=4000000
+y_0=2800000 +ellps=GRS80</span></p>
<p class="p1" style="margin:0px"><span class="s1"></span><br>
</p>
<p class="p1" style="margin:0px"><span class="s1"><span class="Apple-converted-space">result : </span>3474789.9972
<span class="Apple-converted-space"> </span>2655359.2908
<span class="Apple-converted-space"> </span>43.6421
<span class="Apple-converted-space"> </span>inf</span></p>
<p class="p1" style="margin:0px"><span class="s1"></span><br>
</p>
<p class="p1" style="margin:0px"><span class="s1">reference
from THE official IGN/SGN dataset:</span></p>
<p class="p1" style="margin:0px">3474789.997<span class="Apple-tab-span"> </span>2655359.291<span class="Apple-tab-span"> </span>43.642</p>
<p class="p1" style="margin:0px"><br>
</p>
<p class="p1" style="margin:0px"><br>
</p>
<p class="p1" style="margin:0px"><font face="arial, helvetica, sans-serif" color="#000000"><span style="font-size:16px">Thanks a lot for your help,</span></font></p>
<p class="p1" style="margin:0px"><br>
</p>
<p class="p1" style="margin:0px"><font face="arial, helvetica, sans-serif" color="#000000"><span style="font-size:16px">Nicolas Bellaiche</span></font></p>
<div><br>
</div>
</div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre">_______________________________________________
PROJ mailing list
<a href="mailto:PROJ@lists.osgeo.org" target="_blank" rel="nofollow noopener noreferrer">PROJ@lists.osgeo.org</a>
<a href="https://lists.osgeo.org/mailman/listinfo/proj" target="_blank" rel="nofollow noopener noreferrer">https://lists.osgeo.org/mailman/listinfo/proj</a>
</pre>
</blockquote>
<pre class="moz-signature">--
<a href="http://www.spatialys.com" target="_blank" rel="nofollow noopener noreferrer">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre><br></div></div></body></html>