The Question:
"The submitted elevation certificate references a Lowest Adjacent Grade (LAG) elevation of 898.0 ft NAVD 88. Cobb County GIS topography shows a LAG of approximately 892.0ft NAVD 88 for the structure. Please have your surveyor verify his benchmark and elevations."
This is a joke to me and here is my response to FEMA.
Dear FEMA,
Please see the following disclaimer from Cobb County GIS.
GIS Data Disclaimer
In order to launch the online mapping you must read and agree with the following data disclaimer.
The Cobb County GIS data are primarily for the support of its internal business functions and the public services it provides. The GIS data, which Cobb County serves on the online mapping or distributes, are for informational purposes only and may not be suitable for other purposes or uses. It is the user’s responsibility to verify any information derived from the GIS data before making any decisions or taking any actions based on the information. Cobb County is not liable for any errors in the GIS data. This includes errors of omission, commission, errors concerning the content of the data, and relative and positional accuracy of the data. Each data may have been collected at different scales, times or definitions, resulting in inconsistencies among features represented together on this map. Primary sources from which these data were compiled must be consulted for verification of information contained in the data. Zoning data was prepared for the visual representation of zoning districts, variances and land use permits; for official records, zoning files, and zoning hearing minutes should be consulted. Parcel data was prepared for the visual representation of real property found within Cobb County, and is not necessarily accurate by surveying standards. If absolute accuracy and detail is required, the deeds, plats and other related records on file with the Superior Court Clerk should be consulted. Cobb County assumes no legal responsibility for this information. Cobb County does not guarantee that the data and map services will be available to users without interruption or error. Furthermore, Cobb County may modify or remove map services and access methods at will.
Thank You
Licensed Surveyor
> If absolute accuracy and detail is required, the deeds, plats and other related records on file with the Superior Court Clerk should be consulted.
See, I think this is where the FEMA person went wrong. The GIS is just pretty close, so obviously, they should have consulted the Superior Court Clerk for "absolute accuracy". Send them the Clerk's email ...
Good response.
I have been wondering when something like this might come up.