When I have to import DXF layers with no projection, I usually register using the US State Plane 1983 feet.  Obviously, after registering this layer in Mapinfo, it does not plot anywhere near the actual site location.  I zoom FAR out, Select All from the imported autocad layer, and drag the data to a topo raster map, aligning the data with a road, known data point, etc.  Not the most efficient method, but it usually works.

 

_______________________________

Anthony Hicke, PG, CHG

Project Groundwater Geologist

Richard C. Slade & Associates LLC

818.506.0418  North Hollywood

707.963.3914  St. Helena

818.506.1343  Fax

 

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From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Martin A Spiers
Sent: Thursday, July 13, 2006 1:43 AM
To: MariPitkäaho
Cc: [EMAIL PROTECTED]; [email protected]
Subject: Re: [MI-L] DXF & DWG Import - Maintaining Layers & Minimizing Warp

 


Normal DWG files do not contain a projection. Generally they are drawn to scale, normal engineering drawings are likely to be in metres, millimetres, feet or inches.

One way of turning a multi-layer DWG file into a single TAB is to first convert it to a DXF , then use MapInfo's Table > Import function to convert that.

Hope this helps.

Martin Spiers
Senior Engineer
MWH
Kenburgh House,
Manor Row,
Bradford
BD1 4QU
Tel: 01274 718786
Fax: 01274 718799
email:  [EMAIL PROTECTED]


"Mari Pitkäaho" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]

13/07/2006 09:03

To

[email protected]

cc

 

Subject

Re: [MI-L] DXF & DWG Import - Maintaining Layers & Minimizing Warp

 

 

 




Hi,

this seems to be an old topic, but perhaps someone notices the message now... I too would appreciate help with DWG imports. Frank pretty much summed up all my problems too.

Best regards,

Mari Pitkäaho

2006/4/13, Frank Aaron (TX/EUS) <[EMAIL PROTECTED]>:
Hi All,

Does anyone know of a way to maintain a DWG file so that it does not devolve into all of the miscellaneous layers when importing through MI 8's UT? Additionally, does a way exist to determine the projection that the drawing may have been saved when it was created with AutoCad? I do not have access to AutoCad but can use a viewer - did not know if any viewers allow for the determination of the file's projection if it does exist. If a projection was not associated with the DWG - what projection is recommended to use with a set of Geocoded Data (i.e., Radio Measurements collected with a Garmin GPS that was set to Long/Lat: WGS84) that will be overlaid on the map. I want to minimize the warping of the DWG file. Best regards,

Frank Aaron, MSc. Physics, MSEE
Staff Wireless Systems Engineer, RF Engineering Services

Ericsson USA

Service & Solutions Operations, NA

Tel:      (972) 583-0112

Fax:     (972) 583-2273

Mobile: (972) 679-9291

mail to:
frank. [EMAIL PROTECTED]

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