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Subject Author Date
MapInfo Datums Travis 11-30-2005
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Posted by Travis on November 30, 2005, 12:21 am
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 Does anyone know what D_MAPINFO is? I know it is a datum that MapInfo
uses, but does anyone have any information on it. Is in a proprietary
datum? I have not found any information on it on the MapInfo web site. It
is the datum that ArcMap says a shapefile is in after a MapInfo layer, with
an unspecified datum, is converted to a shape file using the universal
translator. This is from MapInfo Professional 8..I think...

Thanks Travis


Information from ESRI shape file:

Geometry Type: Polygon
Geographic Coordinate System: Lat Long for MAPINFO type 0 Datum
Datum: D_MAPINFO
Prime Meridian: 0
Angular Unit: Degree

Posted by Uffe Kousgaard on November 30, 2005, 1:36 am
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 It is similar to a SHP file without PRJ file, but at least you know it is
geographic coordinates (latitude / longitude). The Spheroid is unknown.

If you need to overlay it with other data, you should go back to the source
and try to find out the real coordinate system.

Regards
Uffe

> Does anyone know what D_MAPINFO is? I know it is a datum that MapInfo
> uses, but does anyone have any information on it. Is in a proprietary
> datum? I have not found any information on it on the MapInfo web site.
> It
> is the datum that ArcMap says a shapefile is in after a MapInfo layer,
> with
> an unspecified datum, is converted to a shape file using the universal
> translator. This is from MapInfo Professional 8..I think...
>
> Thanks Travis
>
>
> Information from ESRI shape file:
>
> Geometry Type: Polygon
> Geographic Coordinate System: Lat Long for MAPINFO type 0 Datum
> Datum: D_MAPINFO
> Prime Meridian: 0
> Angular Unit: Degree



Posted by Travis on December 1, 2005, 12:43 am
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Doesn't MapInfo need to know the datum in order to display the layer.
Plus, one of the layouts in MapInfo that I have has a UTM layer in it, and
it doen't seem to have a problem. Wouldn't that mean that MapInfo knows
what datum it is, or at least applies a default datum to it, to either
convert the UTM layer to lat/long or to convert the lat/long layer to UTM.

Travis

Posted by Uffe Kousgaard on December 2, 2005, 4:11 am
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>
> Doesn't MapInfo need to know the datum in order to display the layer.
> Plus, one of the layouts in MapInfo that I have has a UTM layer in it, and
> it doen't seem to have a problem. Wouldn't that mean that MapInfo knows
> what datum it is, or at least applies a default datum to it

It assumes WGS84 as datum. Doesn't have to be correct, though.

Regards
Uffe



Posted by Travis on December 5, 2005, 2:59 pm
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>
> It assumes WGS84 as datum. Doesn't have to be correct, though.
>
> Regards
> Uffe
>
>

Thanks Uffe

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