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

[Jim Dahl]

Good Idea, the 6 inch photos are not even noticable as better than 12
inch until you zoom into under 1:1000 or more.  Even though the
compressed ECWs are about 8GB, the server seems pretty fast.  I will
think about trying at least two levels and see how that works.  Maybe a
3 foot and 2 foot.
 
Jim

	-----Original Message-----
	From: Nelson Soto [mailto:NSoto at plotplans.com] 
	Sent: Friday, November 07, 2008 2:53 PM
	To: Jim Dahl; Dan Little; geomoose-users at lists.sourceforge.net
	Subject: RE: [Geomoose-users] Image display covers up layers
beyond itsextent
	
	

	It's my understanding that ECW is pretty excessive
resource-wise. Just make several different quality outputs of your ECW
and use MINSCALE and MAXSCALE in the map file to produce the one you
want at a given scale. I know when I started using JP2 I quickly decided
on MINSCALE MAXSCALE implementation for speed concerns and if done with
enough levels, you really shouldn't notice.

	 

	
________________________________


	From: Jim Dahl [mailto:jim.dahl at mail.co.douglas.mn.us] 
	Sent: Friday, November 07, 2008 3:42 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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