[Geomoose-users] Image display covers up layers beyond itsextent

[Fischer, Brian]

Use an imagetype of PNG24.  That will improve the quality. The default
output for PNG is only 8 bit.

 

Take a look at outputformat on the MapServer documentation for more
help.

 

Brian Fischer

Houston Engineering, Inc.

Maple Grove, MN

(763) 493-4522

 

From: Jim Dahl [mailto:jim.dahl at mail.co.douglas.mn.us] 
Sent: Friday, November 07, 2008 2:42 PM
To: Dan Little; geomoose-users at lists.sourceforge.net
Subject: Re: [Geomoose-users] Image display covers up layers beyond
itsextent

 

Everyone, When I set transparency to true and tell it imagetype is PNG,
then the image around it shows.  However, the quality of the image is
poor so I cannot use it.  So I am back to using ECW.  Thanks again.

 

jim

	-----Original Message-----
	From: Dan Little [mailto:danlittle at yahoo.com] 
	Sent: Friday, November 07, 2008 2:07 PM
	To: Jim Dahl; geomoose-users at lists.sourceforge.net
	Subject: Re: [Geomoose-users] Image display covers up layers
beyond its extent

	Images being served as a JPEG are not "see through" so if you
have an ECW that covers the City, mapserver will fill the rest of the
image with a color (typically white).  Transparency comes into play,
because if you serve the image as a PNG or GIF then the "white" becomes
"see through" (aka "transparent").
	
	This isn't a limitation of Mapserver or GeoMOOSE, it's a
limitation of the JPEG format.

	 

	
________________________________


	From: Jim Dahl <jim.dahl at mail.co.douglas.mn.us>
	To: Dan Little <danlittle at yahoo.com>;
geomoose-users at lists.sourceforge.net
	Sent: Friday, November 7, 2008 2:01:50 PM
	Subject: RE: [Geomoose-users] Image display covers up layers
beyond its extent

	The image is an ECW but JPG acts the same way.  My question is
why does transparency come into play when I do not want to see under the
image, I want to see beyond the extent of the image.  For example the
image is 1 mile by 1 mile and it still covers up the whole county.  Is
that because the mapserver still thinks the image is county-wide?

	 

	jim

		-----Original Message-----
		From: Dan Little [mailto:danlittle at yahoo.com] 
		Sent: Friday, November 07, 2008 1:55 PM
		To: Jim Dahl; geomoose-users at lists.sourceforge.net
		Subject: Re: [Geomoose-users] Image display covers up
layers beyond its extent

		What type of layer is it?
		
		If it's raster it's a little harder to deal with because
it's probably being served as a JPEG and JPEG's don't support
transparency.
		
		If it's a GIF then it's pretty easy to just set the
image as transparent, so if there isn't any data it shouldn't show up.

		 

		
________________________________


		From: Jim Dahl <jim.dahl at mail.co.douglas.mn.us>
		To: geomoose-users at lists.sourceforge.net
		Sent: Friday, November 7, 2008 11:08:54 AM
		Subject: [Geomoose-users] Image display covers up layers
beyond its extent

		Hope to have better luck with this question..  Does
anyone know how I can keep an image that covers only a city from
covering up another image below it that covers the entire county?  The
extent doesn't seem to work for me in the mapfile.

		 

		thanks,

		 

		Jim Dahl, GISP
		GIS Coordinator
		Douglas County Public Works
		509 3rd Ave W
		PO Box 398
		Alexandria MN 56308

		V 320-762-2933
		   320-763-6001
		F 320-763-7955

		 

		 

	 

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