[SCadaddle]

I poked around a bit on the googler just to see what you Canadians have up there with regard to something similar to FEMA, Flood Insurance, Maps and Elevation Certificates like we have down here in the lower 48, eh.

I didn't find too much.

So here's what you do, if you are an engineer and trying to save a buck by doing what you can do yourself with your transit or GPS Theodolite or whatever. IF a local Surveying outfit can perform an Elevation Certificate for you, doesn't matter if you are in a flood zone or not, for that matter here in the lower 48 the Continental Divide in the Rocky Mountains is in a "Zone X", that would probably be pretty reasonable. I'd think 50 cents on the dollar compared to the $1500-$2000 dollars mentioned above. Then, with the Certificate you'd have a real elevation established on the finish floor of your lovely abode. Probably other elevations such as lowest and highest adjacent grades as well. Numbers you can work with. Real numbers. And you've got a Surveyors stamp/seal and signature on the documents that are now your metadata.

Remember, metadata is data about the data.

Do your thing draw your map provide the metadata to back it up. Done.