How can I get the values for contour intervals and measuring unit (feet or metres) for the NTDB vector data?
For the NTDB datasets, you can download the file Intervals_NTDB.pdf which shows the list of all datasets with their contour intervals and the measuring unit. For the NTDB data sets at the scale 1:250,000 all data are in metric measuring unit. In the metadata file (html or xml), you will find the information in the Abstract of the Identifiation Information section.
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