Este fichero se encuentra en dominio público' porque this image is from the Natural Resources Canada site, and they state that it may be used for Non-commercial Reproduction under the following terms:

• Information on this site has been posted with the intent that it be readily available for personal and public non-commercial use and may be reproduced, in part or in whole and by any means, without charge or further permission from Natural Resources Canada. We ask only that:
• Users exercise due diligence in ensuring the accuracy of the materials reproduced;
• Natural Resources Canada be identified as the source department; and,
• The reproduction is not represented as an official version of the materials reproduced, nor as having been made, in affiliation with or with the endorsement of Natural Resources Canada.''

En algunos países esto no es legalmente posible, en ese caso:

Se concede el derecho de utilizar este trabajo para cualquier propósito, sin ninguna condición, a menos que estas condiciones sean requeridas por la ley.