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    <blockquote type="cite"

cite="mid:RvcfPEWaemNbQDVkV_vVTAGSGjX8mmP_yo1HpIVFmPgY0w0QohteQd8ok9_XzLpLLEXdxPUE0dE3INVqURwHlE938AEoTVJVKsihzgXLfQE=@protonmail.ch">

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        <div>ESRI used to have the most comprehensive on-line CRS

          repository, but it was taken off line some years back.

          Therefore spatialreference.org is also an important resource

          to ESRI users.<br>

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    <p>The raw content is available in their github repository at

      <a class="moz-txt-link-freetext" href="https://github.com/Esri/projection-engine-db-doc/">https://github.com/Esri/projection-engine-db-doc/</a> . That's what

      PROJ ingests regularly to refresh objects under the ESRI authority

      (which are now available on spatialreference.org)</p>

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    <pre class="moz-signature" cols="72">-- 

<a class="moz-txt-link-freetext" href="http://www.spatialys.com">http://www.spatialys.com</a>

My software is free, but my time generally not.</pre>

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