[Mapserver-users] Edges of Images
Ed McNierney
ed at topozone.com
Mon Oct 20 22:31:57 EDT 2003
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Sorry!
=20
Yes, the only reasonable way I know of to do this is to duplicate tiles
A1/B1 as "A5" and "B5", adjusting their tiepoints so they run from +180
to +270 degrees. Do the same to duplicate A4/B4 as A0/B0, running from
-270 to -180. The equator may be a continuous line on the Earth, but it
isn't one on your map!
=20
- Ed
=20
=20
Ed McNierney
President and Chief Mapmaker
TopoZone.com
ed at topozone.com
=20
-----Original Message-----
From: Benjamin Wragg [mailto:bwragg at tpg.com.au]=20
Sent: Monday, October 20, 2003 6:28 PM
To: Ed McNierney; mapserver-users at lists.gis.umn.edu
Subject: RE: [Mapserver-users] Edges of Images
=20
Thanks Ed. Thats not quite what I meant though. This person has asked if
is there some magical way for mapserver to show the left side of the B1
image when I'm zoomed in over the right side of the B4 image. The B1
tile is georeferenced to have a minx of -180 and the B2 tile is
georeferenced to have a maxx of +180 so in the real world these two
edges should meet. Instead a white area is displayed anywhere right of
the +180
=20
=20
-----Original Message-----
From: mapserver-users-admin at lists.gis.umn.edu
[mailto:mapserver-users-admin at lists.gis.umn.edu] On Behalf Of Ed
McNierney
Sent: Saturday, 18 October 2003 8:22 AM
To: bwragg at tpg.com.au; mapserver-users at lists.gis.umn.edu
Subject: RE: [Mapserver-users] Edges of Images
Benjamin -
=20
Set the map image background to white and then use the OFFSITE
255 255 255 statement in the data layer to make all white pixels
transparent (assuming the no-data value really is exactly that value).
This will cause areas of white that overlap another tile to disappear,
and any valid data pixels that are white will expose the white
background and show up as white.
=20
- Ed
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
-----Original Message-----
From: Benjamin Wragg [mailto:bwragg at tpg.com.au]
Sent: Friday, October 17, 2003 6:43 PM
To: mapserver-users at lists.gis.umn.edu
Subject: [Mapserver-users] Edges of Images
Hi,
=20
I'm currently using 8 satalite image tiles of the world
(referenced in lat/longs) in Mapserver as shown below:
=20
--------------------------
A1 | A2 | A3 | A4 |
--------------------------
B1 | B2 | B3 | B4 |
--------------------------
=20
If I zoom into the lower right tile (B4) I can see a
large white band running top to bottom where the tile finishes just
right of New Zealand. Someone has asked me if it's possible for
Mapserver to automatically display the next logical tile (which would be
B1) to stop the ugly white band. Any ideas?
=20
Cheers,
=20
Benjamin Wragg
=20
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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Sorry!<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Yes, the only reasonable way I know =
of to
do this is to duplicate tiles A1/B1 as “A5” and =
“B5”,
adjusting their <span class=3DSpellE>tiepoints</span> so they run from =
+180 to
+270 degrees. <span style=3D'mso-spacerun:yes'> </span>Do the same =
to duplicate
A4/B4 as A0/B0, running from -270 to -180.<span =
style=3D'mso-spacerun:yes'>
</span>The equator may be a continuous line on the Earth, but it =
isn’t
one on your map!<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><span =
style=3D'mso-tab-count:1'>  =
; </span>-
Ed<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=3DMsoPlainText><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;color:navy;mso-no-proof:yes'><o:p> </o:p><=
/span></font></p>
<p class=3DMsoPlainText><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;color:navy;mso-no-proof:yes'>Ed =
McNierney<o:p></o:p></span></font></p>
<p class=3DMsoPlainText><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;color:navy;mso-no-proof:yes'>President and =
Chief
Mapmaker<o:p></o:p></span></font></p>
<p class=3DMsoPlainText><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;color:navy;mso-no-proof:yes'>TopoZone.com<o:p><=
/o:p></span></font></p>
<p class=3DMsoPlainText><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;color:navy;mso-no-proof:yes'>ed at topozone.com<o:=
p></o:p></span></font></p>
</div>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> Benjamin Wragg
[mailto:bwragg at tpg.com.au] <br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Monday, October 20, =
2003
6:28 PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> Ed McNierney;
mapserver-users at lists.gis.umn.edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: =
[Mapserver-users]
Edges of Images</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'>Thanks Ed. Thats =
not
quite what I meant though. This person has asked if is there some =
magical
way for mapserver to show the left side of the B1 image when I'm zoomed =
in over
the right side of the B4 image. The B1 tile is georeferenced to have a =
minx of
-180 and the B2 tile is georeferenced to have a maxx of +180 so in the =
real
world these two edges should meet. Instead a white area is displayed =
anywhere
right of the +180</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal =
style=3D'mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'>-----Original Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b>
mapserver-users-admin at lists.gis.umn.edu
[mailto:mapserver-users-admin at lists.gis.umn.edu] <b><span =
style=3D'font-weight:
bold'>On Behalf Of </span></b>Ed McNierney<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Saturday, 18 =
October 2003
8:22 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> bwragg at tpg.com.au;
mapserver-users at lists.gis.umn.edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: =
[Mapserver-users]
Edges of Images<o:p></o:p></span></font></p>
</div>
<blockquote =
style=3D'margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'>Benjamin =
-</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'>Set the map =
image
background to white and then use the OFFSITE 255 255 255 statement in =
the data
layer to make all white pixels transparent (assuming the no-data value =
really
is exactly that value). This will cause areas of white that =
overlap
another tile to disappear, and any valid data pixels that are white will =
expose
the white background and show up as white.</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font><font =
size=3D2
color=3Dblue face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;
color:blue'>- Ed</span></font><o:p></o:p></p>
</div>
<div>
<p style=3D'margin-left:.5in'><font size=3D2 face=3D"Times New =
Roman"><span
style=3D'font-size:10.0pt'>Ed McNierney<br>
President and Chief Mapmaker<br>
TopoZone.com / Maps a la carte, Inc.<br>
73 Princeton Street, Suite 305<br>
North Chelmsford, MA 01863<br>
ed at topozone.com<br>
(978) 251-4242 </span></font><o:p></o:p></p>
</div>
<blockquote =
style=3D'margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<p class=3DMsoNormal =
style=3D'mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'>-----Original Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> Benjamin Wragg
[mailto:bwragg at tpg.com.au]<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Friday, October 17, =
2003
6:43 PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b>
mapserver-users at lists.gis.umn.edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> =
[Mapserver-users] Edges
of Images</span></font><o:p></o:p></p>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Hi,</span></font><o:p></o:p>=
</p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>I'm currently using 8 =
satalite image
tiles of the world (referenced in lat/longs) in Mapserver as shown =
below:</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>--------------------------</=
span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>A1 | A2 | A3 | A4 =
|</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>--------------------------</=
span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>B1 | B2 | B3 | B4 =
|</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>--------------------------</=
span></font><o:p></o:p></p>
</div>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>If I zoom into the lower =
right tile
(B4) I can see a large white band running top to bottom where the tile =
finishes
just right of New Zealand. Someone has asked me if it's possible for =
Mapserver
to automatically display the next logical tile (which would be B1) to =
stop the
ugly white band. Any ideas?</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Cheers,</span></font><o:p></=
o:p></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Benjamin =
Wragg</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
</blockquote>
</blockquote>
</div>
</body>
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=00
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