Adds sample data in EPT format

[iosefa]

This PR adds sample data in the EPT format.

The sample dataset was originally prepared by Markus Neteler and Helena Mitasova in their book "Open Source GIS: A GRASS GIS Approach". It has been converted to the EPT format for testing purposes.

[dkastl]

@iosefa , is this NorthCarolina data from GRASS workshop?

[iosefa]

@dkastl , yes it is

[dkastl]

As long as we don't change this data too often, it should not increase the size of the repository too

[martinheidegger]

Thank you for the PR ... oh so many files 😅 . After reading your kind documentation

The following dataset may be used for visualization and testing purposes.

... I was wondering if we should place the data in a own repository (That is published on npm). In order for the data to be only downloaded for development purposes and not keep historic data. Would you be okay with that? @pnext/admin

The data itself is looks good with lots of edges that allow for good tests. What i noticed: I wish there also was binary data version to test the other way data could be stored (also its quicker to implement).

[martinheidegger]

Ping @iosefa

[iosefa]

@martinheidegger, Aren't .las and .laz binary file formats? Or was there another specific file format that you were thinking of? Re. a published repository on npm, I can get to this next week 😄

[martinheidegger]

Yes, .las and .laz are binary file formats; but EPT supports custom binary data: https://github.com/connormanning/ept#datatype