Hey all! I've been on hiatus from blogging due to the fact that I've been cranking out words to be included in the soon-to-be-released Mastering Civil 3D 2012. You should buy this book. REALLY you should.
So I'm back...and here's like a post and stuff:
In 1959, a revolution rocked the world and the only people who noticed were surveyors and mapping professionals. This was the year that the US and its buddies decided to change the formal definition of a foot from 1ft = 0.3048006096 meters to 1 ft = 0.3048000 meters.
The problem is, most land was already surveyed by 1959, so a change in the definition of a foot could change the recorded location of survey monuments up to several feet. This major moving of the proverbial cheese has been received with mixed acceptance. For the most part, surveyors still use the 1 ft = 0.3048006096 meter definition for their work.
Why does CAD care?
One of the fundamental differences between Microstation and AutoCAD is how the programs handle units and coordinate systems. Under the hood, Microstation only stores things in meters. To an end-user using feet, Microstation uses the International foot value to convert for display. It is on the data-end that programs like InRoads and Caice compensate for the slight discrepancies between US survey feet and International feet.
The DGN by itself is always stuck in International feet.
Attached to this post is the procedure for importing a DGN and getting it translated from International feet to US survey feet. The steps in the attached document outline how to manually force the program to translate the coordinates.
How to Import a DGN into Civil 3D CORRECTLY
Enjoy!
So I'm back...and here's like a post and stuff:
In 1959, a revolution rocked the world and the only people who noticed were surveyors and mapping professionals. This was the year that the US and its buddies decided to change the formal definition of a foot from 1ft = 0.3048006096 meters to 1 ft = 0.3048000 meters.
The problem is, most land was already surveyed by 1959, so a change in the definition of a foot could change the recorded location of survey monuments up to several feet. This major moving of the proverbial cheese has been received with mixed acceptance. For the most part, surveyors still use the 1 ft = 0.3048006096 meter definition for their work.
Why does CAD care?
One of the fundamental differences between Microstation and AutoCAD is how the programs handle units and coordinate systems. Under the hood, Microstation only stores things in meters. To an end-user using feet, Microstation uses the International foot value to convert for display. It is on the data-end that programs like InRoads and Caice compensate for the slight discrepancies between US survey feet and International feet.
The DGN by itself is always stuck in International feet.
Attached to this post is the procedure for importing a DGN and getting it translated from International feet to US survey feet. The steps in the attached document outline how to manually force the program to translate the coordinates.
How to Import a DGN into Civil 3D CORRECTLY
Enjoy!
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