I would like to review data sheets for old (unstable) NGS monuments in Southwest Mississippi and portions of Louisiana.?ÿ It has been a few years since I retrieved any and maybe NGS does not provide information on monuments in areas of known subsidence any more.?ÿ Any recommendations will be appreciated.?ÿ Thanks.
When you search on the NGS site for data sheets there is a selection to enable or disable questionable heights subsidence areas.
Mr. Ford,
As Bill93 said, choose to see superseded data when requesting a datasheet. The top of the datasheet will show current stuff except for heights. because of subsidence.
Looking further down the page find the superseded data. It will show the previous values and dates for those values. That may be what you are looking for.
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