[mapserver-users] MapInfo and projections
Martin, Daniel
DMartin@erac.com
Thu, 6 Jun 2002 15:15:02 -0500
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I am using data from MapInfo in MapServer 3.6, which is working great,
except the resulting maps aren't projected as I'd like them. In simple
terms, they look squished. My background is in development, not GIS. I
will be the first to admit my GIS knowledge is rather limited. My
understanding of projections is minimal.
This is what I see in the MapInfo TAB files:
"\Spatial Reference\Geographic\Projection" = ""
"\Spatial Reference\Geographic\Projection\Clause" = "CoordSys Earth
Projection 1, 0"
"\Spatial Reference\Geographic\Projection\Name" = "Longitude / Latitude"
"\Spatial Reference\Geographic\Coordinate Units" = "Decimal Degree"
"\Spatial Reference\Geodetic" = ""
"\Spatial Reference\Geodetic\Datum" = "na"
"\Spatial Reference\Geodetic\Ellipsoid" = "na"
Every layer is like this, so I simply identified each layer with
"proj=latlong" in the .map file. I also identified the map as
"proj=latlong". Using these settings, in MapServer I get a squished map.
When I open the same layers in MapInfo where I have them identified with a
projection of Latitude / Longitude they map perfectly (ala don't look
squished).
Every time I've defined the map with another projection, I end up looking at
a blank map. I can't seem to figure out which projection I should be using.
I have created one map of Germany and one of Missouri, and both exhibit the
same problem.
Does anyone have experience using MapInfo tables that could shed some light
for a GIS newbie?
Thanks,
Dan Martin
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<DIV><SPAN class=116264119-06062002><FONT face=Arial size=2>I am using data from
MapInfo in MapServer 3.6, which is working great, except the resulting maps
aren't projected as I'd like them. In simple terms, they look
squished. </FONT></SPAN><SPAN class=116264119-06062002><FONT face=Arial
size=2>My background is in development, not GIS. I will be the first
to<SPAN class=116264119-06062002><FONT face=Arial size=2> admit my GIS
knowledge is rather limited. My understanding of projections is
minimal.</FONT></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=116264119-06062002><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=116264119-06062002><FONT face=Arial size=2>This is what I see
in the MapInfo TAB files:</FONT></SPAN></DIV>
<DIV><SPAN class=116264119-06062002><FONT face=Arial size=2>"\Spatial
Reference\Geographic\Projection" = ""<BR>"\Spatial
Reference\Geographic\Projection\Clause" = "CoordSys Earth Projection 1,
0"<BR>"\Spatial Reference\Geographic\Projection\Name" = "Longitude /
Latitude"<BR>"\Spatial Reference\Geographic\Coordinate Units" = "Decimal
Degree"<BR>"\Spatial Reference\Geodetic" = ""<BR>"\Spatial
Reference\Geodetic\Datum" = "na"<BR>"\Spatial Reference\Geodetic\Ellipsoid" =
"na"<BR></FONT></SPAN></DIV>
<DIV><SPAN class=116264119-06062002><FONT face=Arial size=2>Every layer is like
this, so I simply identified each layer with "proj=latlong" in the .map
file. I also identified the map as "proj=latlong". Using these
settings, in MapServer I get a squished map. When I open the
same layers in MapInfo where I have them identified with a
projection of Latitude / Longitude they map perfectly (ala don't look
squished).</FONT></SPAN></DIV>
<DIV><SPAN class=116264119-06062002><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=116264119-06062002><FONT face=Arial size=2>Every time I've
defined the map with another projection, I end up looking at a blank map.
I can't seem to figure out which projection I should be using. I have
created one map of Germany and one of Missouri, and both exhibit the same
problem.</FONT></SPAN></DIV>
<DIV><SPAN class=116264119-06062002><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN class=116264119-06062002>Does anyone
have experience using MapInfo tables that could shed some light for a GIS
newbie?</SPAN></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN
class=116264119-06062002></SPAN></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN
class=116264119-06062002>Thanks,</SPAN></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN class=116264119-06062002>Dan
Martin</SPAN><SPAN
class=116264119-06062002></DIV></SPAN></FONT></FONT></BODY></HTML>
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