Added ground elevation column so track wall can have ground elevation as lower height. Refs #287
Added ground elevation column so track wall can have ground elevation as lower height.
Refs #287

NLeSC/eEcology-Annotation-WS,NLeSC/eEcology-Annotation-WS,NLeSC/eEcology-Annotation-WS,NLeSC/eEcology-Annotation-WS