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SAC-PDG-WEBLVC  May 2017

SAC-PDG-WEBLVC May 2017

Subject:

EnvironmentObject

From:

Brad Dillman <[log in to unmask]>

Reply-To:

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

Date:

Fri, 19 May 2017 09:59:34 -0400

Content-Type:

multipart/mixed

Parts/Attachments:

Parts/Attachments

text/plain (35 lines) , EnvironmentObject.docx (35 lines)

An EnvironmentObject has been proposed (see attached), with 3 geometries: Areal, Linear and Point corresponding to the DIS PDUs. GeoJSON specifies similar geometries for Point, LineString and Polygon:

{ "type": "Point", "coordinates": [0, 0] }

{ "type": "LineString", "coordinates": [[0, 0], [10, 10]] }

{
  "type": "Polygon",
  "coordinates": [
    [
      [0, 0], [10, 10], [10, 0], [0, 0]
    ]
  ]
}

Note that GeoJSON allows either 2 numbers or 3 numbers for each coordinate, where the 3rd number is the elevation.

In the interest of interoperability, I suggest we adopt these formats for the Geometry property of the EnvironmentObject.

As is the case for dead reckoning already:
for clients using geocentric references, coordinates would be [x, y, z], where all 3 are required, and 
for clients using geodetic references, coordinates would be [lat, lon, elev]; if 'elev' is omitted ground or sea level is assumed as appropriate (to eliminate any ambiguity, specify 'elev' explicitly).

Comments?





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