[Mapserver-users] ECW not showing below certain scale

Wed Jun 23 18:04:02 PDT 2004

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Hi All,

I've been running into a little problem with mapserver 4.2, which I was also
experiencing in Chameleon 1.99; when I zoom in quite far on the map (holding
an ecw image), the map doesn't show up. It keeps trying to load, but nothing
comes, suggesting it got stuck somewhere. CPU activity is initially at
maximum for a few seconds (as normal when loading the map) but then drops
while the map doesn't show (I'm loading the map in the browser on the server
itself). The mapserv process won't allow itself to get killed either.

If I simply replace my mapserv.exe file with one of version 4.0, the problem
is gone. Of course the map takes quite a few seconds to show, which is
normal when zooming close on an ECW, but it does show.

I've tried this quite a few times in different browsers, but the map never
shows at that scale when the ECW is in there. I have tried different
mapfiles with different ECW's as well. Has the mechanism to display the ECW
changed? It seems that as soon as I reach a resolution where I go beyond the
ECW resolution (1pixel:1pixel) it dies.

Regards,

Jacob

JACOB DELFOS
SPATIAL INFORMATION ANALYST
Maunsell Australia Pty Ltd
629 Newcastle Street
PO Box 81
Leederville 6902
Western Australia
ABN 20 093 846 925

Tel     + 61 8 9281 6185
Fax    + 61 8 9281 6297
jacob.delfos at maunsell.com

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<P><FONT SIZE=3D2 FACE=3D"Arial">Hi All,</FONT>
</P>

I've been running into a little =
problem with mapserver 4.2, which I was also experiencing in Chameleon =
1.99; when I zoom in quite far on the map (holding an ecw image), the =
map doesn't show up. It keeps trying to load, but nothing comes, =
suggesting it got stuck somewhere. CPU activity is initially at maximum =
for a few seconds (as normal when loading the map) but then drops while =
the map doesn't show (I'm loading the map in the browser on the server =
itself). The mapserv process won't allow itself to get killed =
either.

If I simply replace my mapserv.exe =
file with one of version 4.0, the problem is gone. Of course the map =
takes quite a few seconds to show, which is normal when zooming close =
on an ECW, but it does show.

I've tried this quite a few times in =
different browsers, but the map never shows at that scale when the ECW =
is in there. I have tried different mapfiles with different ECW's as =
well. Has the mechanism to display the ECW changed? It seems that as =
soon as I reach a resolution where I go beyond the ECW resolution =
(1pixel:1pixel) it dies.

<P><FONT SIZE=3D2 FACE=3D"Arial">Regards,</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Jacob</FONT>
</P>

<P><B><FONT COLOR=3D"#009500" FACE=3D"Arial">J</FONT><FONT =
COLOR=3D"#009500" SIZE=3D1 FACE=3D"Arial">ACOB</FONT> <FONT =
COLOR=3D"#009500" FACE=3D"Arial">D</FONT><FONT COLOR=3D"#009500" =
SIZE=3D1 FACE=3D"Arial">ELFOS<BR>
</FONT><FONT COLOR=3D"#009500" FACE=3D"Arial">S</FONT><FONT =
COLOR=3D"#009500" SIZE=3D1 FACE=3D"Arial">PATIAL</FONT> <FONT =
COLOR=3D"#009500" FACE=3D"Arial">I</FONT><FONT COLOR=3D"#009500" =
SIZE=3D1 FACE=3D"Arial">NFORMATION</FONT> <FONT COLOR=3D"#009500" =
FACE=3D"Arial">A</FONT><FONT COLOR=3D"#009500" SIZE=3D1 =
FACE=3D"Arial">NALYST</FONT><BR>
</B><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">Maunsell Australia =
Pty Ltd<BR>
629 Newcastle Street<BR>
PO Box 81<BR>
Leederville 6902<BR>
Western Australia<BR>
ABN 20 093 846 925<BR>
<BR>
Tel =A0=A0=A0=A0+ 61 8 9281 6185<BR>
Fax=A0=A0=A0 + 61 8 9281 6297<BR>
</FONT><U><FONT COLOR=3D"#009C21" SIZE=3D2 =
FACE=3D"Arial">jacob.delfos at maunsell.com</FONT></U>
</P>

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