Ian,
Projections are only done on the vertices of the objects. So the 4
corners of the rectangle, which by the way should have a projection
block, will get re-projected BUT then straight lines are drawn between
the corners. If you want the rectangle edges to be reprojected with
curvature, then you have to subdivide the edges into many points so the
straight lines between the points give the appearance of curvature.
PROJECTION ... END blocks need to appear in two places.
in the MAP block the projection defines the output projection to use. If
a LAYER does NOT have a PROJECTION block then DATA for that layer is
assumed to be in the output projection.
If the data for a LAYER is in some other projection then you need to
have a PROJECTION block to define the LAYER's data projection.
-Steve W
On 9/1/2011 12:07 AM, Ian Walberg wrote:
I thought I understood how PROJECTION worked in map files....
The map file below renders the earth/countries outline and a rectangle
with the overall map projection set to init=epsg:4326 and EXTENT -180
-90 180 90.
However when I change the overall map projection to "proj=ortho" and
EXTENT -8000000 -8000000 8000000 8000000 I get a globe drawn the
rectangle has not been projected onto the globe.
I have various other layers with city names etc and all of these project
ok.
What have I misunderstood here?
Thanks
Ian
LAYER
NAME "box"
STATUS DEFAULT
TYPE polygon
FEATURE
WKT "POLYGON ((180.0 0.0, -180.0 0.0, -180.0 90.0, 180.0 90.0, 180.0 0.0))"
END
CLASS
STYLE
COLOR 0 0 100
END
END
PROJECTION
"init=epsg:4326"
END
END
LAYER
NAME world
TYPE polygon
DATA World_Countries.shp
STATUS DEFAULT
CLASS
STYLE
COLOR 50 128 50
OUTLINECOLOR 10 10 10
WIDTH 1
END
END
PROJECTION
"init=epsg:4326"
END
END
PROJECTION
"init=epsg:4326"
# "proj=ortho"
# "lat_0=0.0"
# "lon_0=-90.0"
END
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