NOAA's Vdatum online Transformation tool is down

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GNSS & Geodesy

Last Post by karl25 3 months ago

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peter-lothian

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"The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later."

I'm getting this error message trying to use the web app. Wondering if this is recent or if it's been down for a while?

Posted : July 14, 2026 8:44 am

peter-lothian

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Update: I discovered that Carlson Survey has the capability to transform coordinates between NAD83 and NAD27. Huzzah!

Then I discovered that while the CAD drawing I'm working in shows NAD27 as the north orientation, it is not actually in the NAD27 coordinate system. A note in the drawing layer "SRV-TXT" says "The coordinate system is at an assumed location." This sucker dates back to at least the year 2000.

Posted : July 15, 2026 8:05 am

karl25

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It's great that Carlson Survey can handle the NAD83 ↔ NAD27 transformation. Unfortunately, those older CAD files can be a rabbit hole. "Assumed location" is often a sign that the drawing isn't tied to any real-world datum at all—it just uses a local coordinate system that someone established for the project. If the file dates back to around 2000 (or earlier), that's not unusual.

Posted : July 16, 2026 2:18 am