i hope this is the right way to reply, i just clicked on reply and sent
it again to [email protected] :) thanks for the comment,
but i guess i didnt explain my situation well on my first post
BASELAYER: google hybrid
OVERLAY: my own mapserver map with a single LAYER - an image of a field
as you can see in the picture (here it is again:
http://img688.imageshack.us/img688/5926/99138762.jpg), im really ok with
rectangular shape of the overlay, the problem is that i want it to be
smaller. i already made the layer small but the map itself with a black
background remains big. in my case to start with, i can do fine with a
map with just the size of its only layer. did i explain that well? :P
to make it clearer, imagine this sample scenario:
- google doesnt have a close up image of my house
- i have my own aerial high resolution image of my house so i want to
overlay it above the image google provides
- problem: i already put my own image of my house above google's but the
background of the map (which i assume is IMAGECOLOR 0 0 0) covers
everything else
- i dont want to provide a raster of the entire world (im saying this
because the black part covers almost the whole world), only of my house
- i believe it is possible to create a map with just a specific extent
right? since there are SIZE and EXTENT values on the map file. but i
dont know why it's not working for me
sorry if i misunderstood some stuff.. thanks again!
On 5/12/2010 8:28 PM, mattmendick wrote:
You first have to make sure you are outputting the image as a png or some
other image format that supports transparency. Like this, at the base of the
mapfile:
OUTPUTFORMAT
NAME mypng
DRIVER "GD/PNG"
IMAGEMODE RGB
FORMATOPTION "INTERLACE=false"
MIMETYPE "image/png"
EXTENSION "png"
END
IMAGETYPE mypng
Then, if your source image is not perfectly square, and has black in areas
that you want to be transparent, you can use the "OFFSITE [R] [G] [B]"
attribute. This tells mapserver that any color in the raster that matches
the color in your OFFSITE parameter should be rendered transparent.
ex:
LAYER
NAME "blah"
DATA '/path/to/raster.tiff'
OFFSITE 0 0 0
END
This has worked for me in the past, I hope it works for you.
-Matt Mendick
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