[Mapserver-users] .tiff resolution
Ed McNierney
ed at topozone.com
Thu Feb 6 16:35:54 EST 2003
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Charlton -
=20
You need to make sure that (a) the spatial extents of the image =
displayed are the same in both cases and (b) the physical dimensions of =
the image in pixels are the same in both cases.
=20
You don't mention the spatial resolution of your image, but here's an =
example. You can check your WLD file to see the X and Y sizes of a =
pixel. Let's assume they're both 3 meters; in that case you need to be =
sure the EXTENT of the image in meters is 3 times the number of pixels =
displayed in each dimension.
=20
If you need more info it would help to post your MAP and WLD files.
=20
- Ed
=20
Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA 01863
ed at topozone.com
(978) 251-4242=20
=20
-----Original Message-----
From: Charlton Purvis [mailto:cpurvis at asgnet.psc.sc.edu]
Sent: Thursday, February 06, 2003 4:01 PM
To: mapserver-users at lists.gis.umn.edu
Subject: [Mapserver-users] .tiff resolution
I'd like a 72dpi .tiff to be displayed as accurately in MapServer as it =
is Photoshop. This .tiff is a product of ArcMap. I took a .shp and =
exported it to a map (.tiff, 72dpi). Before I did this I set the =
extents manually. I used these extents to fill in my MapServer extents. =
A .wld was also a product of the ArcMap .tiff translation. So I =
carried that over to my data directory along w/ the .tiff.
=20
So I've ended up w/ a .tiff and a .wld, but I must be missing something =
since it really doesn't look as clean from w/i MapServer as I think a =
72dpi image should. What can I adjust?
=20
The MapServer width and height are in proportion to the extents, and I'm =
working exclusively under MapLab. I haven't hardcoded anything under =
the min/max scale (mostly because I don't have a firm grasp on what that =
is actually doing).
=20
Any help would greatly be appreciated.
=20
=20
=20
=20
Charlton Purvis
(803) 777-4453 : voice
(803) 777-8833 : fax
cpurvis at sc.edu
=20
Advanced Solutions Group
Department of Physics and Astronomy
University of South Carolina
Columbia, SC 29208
=20
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<DIV><SPAN class=3D031193221-06022003><FONT face=3DArial color=3D#0000ff =
size=3D2>Charlton -</FONT></SPAN></DIV>
<DIV><SPAN class=3D031193221-06022003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D031193221-06022003><FONT face=3DArial color=3D#0000ff =
size=3D2>You=20
need to make sure that (a) the spatial extents of the image displayed =
are the=20
same in both cases and (b) the physical dimensions of the image in =
pixels are=20
the same in both cases.</FONT></SPAN></DIV>
<DIV><SPAN class=3D031193221-06022003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D031193221-06022003><FONT face=3DArial color=3D#0000ff =
size=3D2>You=20
don't mention the spatial resolution of your image, but here's an =
example. =20
You can check your WLD file to see the X and Y sizes of a pixel. =
Let's=20
assume they're both 3 meters; in that case you need to be sure the =
EXTENT of the=20
image in meters is 3 times the number of pixels displayed in each=20
dimension.</FONT></SPAN></DIV>
<DIV><SPAN class=3D031193221-06022003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D031193221-06022003><FONT face=3DArial color=3D#0000ff =
size=3D2>If you=20
need more info it would help to post your MAP and WLD =
files.</FONT></SPAN></DIV>
<DIV><SPAN class=3D031193221-06022003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D031193221-06022003> <FONT =
face=3DArial=20
color=3D#0000ff size=3D2>- Ed</FONT></SPAN></DIV>
<DIV><SPAN class=3D031193221-06022003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D031193221-06022003>
<P><FONT size=3D2>Ed McNierney<BR>President and Chief =
Mapmaker<BR>TopoZone.com /=20
Maps a la carte, Inc.<BR>73 Princeton Street, Suite 305<BR>North =
Chelmsford,=20
MA 01863<BR>ed at topozone.com<BR>(978) 251-4242 =
</FONT></P></SPAN></DIV>
<DIV><SPAN class=3D031193221-06022003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> Charlton Purvis=20
[mailto:cpurvis at asgnet.psc.sc.edu]<BR><B>Sent:</B> Thursday, February =
06, 2003=20
4:01 PM<BR><B>To:</B> =
mapserver-users at lists.gis.umn.edu<BR><B>Subject:</B>=20
[Mapserver-users] .tiff resolution<BR><BR></FONT></DIV>
<DIV class=3DSection1>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN =
style=3D"FONT-SIZE: 10pt">I’d=20
like a 72dpi .tiff to be displayed as accurately in MapServer as it is =
Photoshop.<SPAN style=3D"mso-spacerun: yes"> </SPAN>This .tiff =
is a=20
product of ArcMap.<SPAN style=3D"mso-spacerun: yes"> </SPAN>I =
took a .shp=20
and exported it to a map (.tiff, 72dpi).<SPAN style=3D"mso-spacerun: =
yes"> =20
</SPAN>Before I did this I set the extents manually.<SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>I used these extents to fill =
in my=20
MapServer extents.<SPAN style=3D"mso-spacerun: yes"> </SPAN>A =
.wld was=20
also a product of the ArcMap .tiff translation.<SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>So I carried that over to my =
data=20
directory along w/ the .tiff.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN =
style=3D"FONT-SIZE: 10pt">So=20
I’ve ended up w/ a .tiff and a .wld, but I must be missing =
something since it=20
really doesn’t look as clean from w/i MapServer as I think a =
72dpi image=20
should.<SPAN style=3D"mso-spacerun: yes"> </SPAN>What can I=20
adjust?<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN =
style=3D"FONT-SIZE: 10pt">The=20
MapServer width and height are in proportion to the extents, and =
I’m working=20
exclusively under MapLab.<SPAN style=3D"mso-spacerun: yes"> =
</SPAN>I=20
haven’t hardcoded anything under the min/max scale (mostly =
because I don’t=20
have a firm grasp on what that is actually=20
doing).<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN =
style=3D"FONT-SIZE: 10pt">Any=20
help would greatly be appreciated.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; mso-no-proof: =
yes"> <o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; mso-no-proof: =
yes"> <o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; mso-no-proof: =
yes"> <o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D1><SPAN=20
style=3D"FONT-SIZE: 7.5pt; mso-no-proof: yes">Charlton =
Purvis</SPAN></FONT><SPAN=20
style=3D"mso-no-proof: yes"><o:p></o:p></SPAN></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D1><SPAN=20
style=3D"FONT-SIZE: 7.5pt; mso-no-proof: yes">(803) 777-4453 :=20
voice</SPAN></FONT><SPAN style=3D"mso-no-proof: =
yes"><o:p></o:p></SPAN></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D1><SPAN=20
style=3D"FONT-SIZE: 7.5pt; mso-no-proof: yes">(803) 777-8833 :=20
fax</SPAN></FONT><SPAN style=3D"mso-no-proof: =
yes"><o:p></o:p></SPAN></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D1><SPAN=20
style=3D"FONT-SIZE: 7.5pt; mso-no-proof: yes"><A=20
href=3D"mailto:cpurvis at sc.edu">cpurvis at sc.edu</A></SPAN></FONT><SPAN=20
style=3D"mso-no-proof: yes"><o:p></o:p></SPAN></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; mso-no-proof: =
yes"> <o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D1><SPAN=20
style=3D"FONT-SIZE: 7.5pt; mso-no-proof: yes">Advanced Solutions=20
Group<BR>Department of Physics and=20
Astronomy<BR></SPAN></FONT><st1:place><st1:PlaceType><FONT =
size=3D1><SPAN=20
style=3D"FONT-SIZE: 7.5pt; mso-no-proof: =
yes">University</SPAN></FONT></st1:PlaceType><FONT=20
size=3D1><SPAN style=3D"FONT-SIZE: 7.5pt; mso-no-proof: yes"> of=20
</SPAN></FONT><st1:PlaceName><FONT size=3D1><SPAN=20
style=3D"FONT-SIZE: 7.5pt; mso-no-proof: yes">South=20
Carolina</SPAN></FONT></st1:PlaceName></st1:place><FONT size=3D1><SPAN =
style=3D"FONT-SIZE: 7.5pt; mso-no-proof: =
yes"><BR></SPAN></FONT><st1:place><st1:City><FONT=20
size=3D1><SPAN=20
style=3D"FONT-SIZE: 7.5pt; mso-no-proof: =
yes">Columbia</SPAN></FONT></st1:City><FONT=20
size=3D1><SPAN style=3D"FONT-SIZE: 7.5pt; mso-no-proof: yes">,=20
</SPAN></FONT><st1:State><FONT size=3D1><SPAN=20
style=3D"FONT-SIZE: 7.5pt; mso-no-proof: =
yes">SC</SPAN></FONT></st1:State><FONT=20
size=3D1><SPAN style=3D"FONT-SIZE: 7.5pt; mso-no-proof: yes">=20
</SPAN></FONT><st1:PostalCode><FONT size=3D1><SPAN=20
style=3D"FONT-SIZE: 7.5pt; mso-no-proof: =
yes">29208</SPAN></FONT></st1:PostalCode></st1:place><o:p></o:p></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: =
10pt"><o:p> </o:p></SPAN></FONT></P></DIV></BLOCKQUOTE></BODY></HTML=
>
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