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SAC-PDG-WEBLVC  May 2017

SAC-PDG-WEBLVC May 2017

Subject:

Coordinate format

From:

Brad Dillman <[log in to unmask]>

Reply-To:

SAC-PDG-WebLVC <[log in to unmask]>

Date:

Fri, 19 May 2017 10:07:24 -0400

Content-Type:

text/plain

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text/plain (17 lines)

The draft working group had some discussion whether coordinates should be specified as arrays, or as objects with named properties, e.g.

[ 1, 2, 3 ] vs. { "x": 1, "y": 2, "z": 3 }

I propose we stick with the array format which has been used so far, as that matches the GeoJSON format.

Note that the array format doesn't reveal which coordinate reference is used, whereas { "x": 1, "y": 2, "z": 3 } would look different from { "lat": 1, "lon": 2, "elev": 3 }, and make code easier to read.

I suggest good coders could use objects with properties throughout their code, but translate these to WebLVC format when messages are sent or received. You could even write web applications using a strongly typed language such as TypeScript. Application decisions can be different from protocol decisions.

Comments?

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