Loaded Layer not Visible in current Map

[Jason Elemunop]

Hi,

I loaded a road layer into the current map but it's not visible. The road layer was originally a dxf file saved from a map which had a different projection.

I used the Universal Translator to convert the dxf file to a Tab file. I also chose the projection of the current map. Once converted, I loaded the Tab file into the current map. The Table is listed in the Explorer, however the road is not showing in the current map.

I tried it a few times but without success. Not sure where I went wrong.

Regards,

Jason

[Bacon, Tom]

Hi Jason,

 

Have you tried to browse the table to ensure that there are records in it?

 

Tom Bacon BSc

Engineer (Wastewater)

 

T +44 (0) 1444 472380

 

37-39 Perrymount Road

Haywards Heath, West Sussex

RH16 3BN

 

wsp.com

 

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[Bill Thoen]

Try using the "zoom entire layer" command (rightClick in the map window and it's on the shortcut menu). It's probably in the wrong projection. Try using the projection of the dxf file when you first convert it to MapInfo instead of the projection of the current map.

Bill Thoen

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[Jason Elemunop]

Hi, 

I browsed the table and found that there was no record. Also, the projection of the dxf was unknown.

When I zoomed to entire layer, the road layer appeared but was in another map window and the current window disappeared.

The original file was in a local grid (projection) which may have been the reason the projection was unknown when I tried to convert the dxf file. 

Thanks

Jason

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[Jason Elemunop]

Is there a way to still open the table in the current map window?

Thanks

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[David Sherrod]

Your description bears out Bill's call: misprojected. But the fact that it forms a reasonable map portrayal suggests that the projection is "in the ballpark." (For example, projecting a lat-long scheme into meter- or foot-based scheme commonly makes a grotesque map.)

Other than solving the projection issue, I doubt you'll have much satisfaction with trigonometric translations and rotations. Can you write the provider and inquire?

Some thoughts. With a window holding only your desired map, change window projection to something you are conversant with.  Maybe lat-long. Now touch a point or drop a symbol pin.  Are the coordinates in the desired neighborhood, are they 100 km distant, or halfway around the globe?

If within 1000 km, then try again putting both maps in same window (layer? Show all layers). Change the line or polygon properties (style override) to enhance visibility (line weight 48?). Sometimes that makes plain what is too small to see otherwise.

Likely errors?  If UTM, then the zone is wrong.  That's why you wish to discover the physical separation.  If lat-long, the dxf file may have the wrong sign for lat or longitude (e.g., negative instead of positive), throwing the map into the wrong hemisphere. (Hard to get your old and new map into same window.)

On Aug 31, 2017, at 7:25 PM, Jason Elemunop <jelem...@gmail.com> wrote:

Is there a way to still open the table in the current map window?

Thanks

On Thu, Aug 31, 2017 at 5:20 PM, 'Bacon, Tom' via MapInfo-L <mapi...@googlegroups.com> wrote:

Hi Jason,

 

Have you tried to browse the table to ensure that there are records in it?

 

Tom Bacon BSc

Engineer (Wastewater)

 

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[Jason Elemunop]

The problem is Projection.

I have noted that in the map window of the imported (dxf) layer, moving the cursor around in the window and looking at the cursor location on the task bar, the coordinates appear to be the coordinates of the source map and not for the current map window even though its the projection for the current map window. The source projection is a local grid that is not a listed projection. 

It may have been that when the map was saved as a dxf, the conversion was not applied.

Thanks

[Shweta]

Hi Jason, 

Other than confirming if there are attributes in the table, you can also right click on the map and choose > view entire layer. Sometimes,changing the projection has this effect.

Regards,

Shweta

[CDR Group]

Hi Jason

Classic drawing from a CAD user where 0,0 is in the bottom left of the drawing.
So whilst you have created a tab in the correct projection, my guess is that your roads
will be very close to the origin of your projection.
If this is British National Grid you may find them close to the Scilly Isles in the Atlantic.
Similar effect for the Irish Grid - in the Atlantic.

If this is the case then you can re-project vectors to where the roads should be - new tool in version 16.

Regards

John Ievers

CDR Group
www.cdrgroup.co.uk
Tel: 01433 621282
Fax: 01433 621292
Specialists in Geographic Information Systems

CDR Group is the trading name of Contract Data Research Ltd.
Registered address Eccles House, Eccles Lane, Hope, Hope Valley, S33 6RW.
Registration No. 1972326
VAT No. GB373 3117 67

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