[Mapserver-users] I have some landsat 7 data that I want to tile : overlap + transparency
Stephen Clark
stephen.clark at focus.ca
Mon Feb 2 15:30:29 EST 2004
Ed or others,
If you have the time could you look at the LAYER below and help me out with
the appropriate parameters to get a 300 dpi image at 6 inches using the
BBOX, WIDTH and HEIGHT centering on UTM Zone 10 coordinates 583695, 6267684.
Has there been some discussions on this in the Archives because I have come
up with a blank on this..?
thanks
Stephen
----- Original Message -----
From: "Stephen Clark" <stephen.clark at focus.ca>
To: "Ed McNierney" <ed at topozone.com>; "Kralidis,Tom [Burlington]"
<Tom.Kralidis at ec.gc.ca>; "Frank Warmerdam" <warmerdam at pobox.com>
Cc: <mapserver-users at lists.gis.umn.edu>
Sent: Monday, February 02, 2004 9:14 AM
Subject: Re: [Mapserver-users] I have some landsat 7 data that I want to
tile : overlap + transparency
> Ed,
>
> How would I do that with the following layer for CanImage:
>
> e.g., using the BBOX parameter ???
>
>
> LAYER # Centre d'information Topographique - CIT Sherbrooke
> NAME "CANIMAGE"
> TYPE RASTER
> OFFSITE 0 0 0
> STATUS on
> CONNECTIONTYPE WMS
> CONNECTION "http://wms.cits.rncan.gc.ca/cgi-bin/cubeserv.cgi?"
> METADATA
> "wms_title" "CANIMAGE"
> "wms_name" "CANIMAGE:CanImage/CanImage"
> "wms_server_version" "1.1.0"
> "wms_srs" "epsg:26910"
> "wms_format" "image/png"
> END
> PROJECTION
> "init=epsg:26910"
> END
> END #
>
>
>
> Thanks
> Stephen
>
>
>
> ----- Original Message -----
> From: "Ed McNierney" <ed at topozone.com>
> To: "Kralidis,Tom [Burlington]" <Tom.Kralidis at ec.gc.ca>; "Stephen Clark"
> <stephen.clark at focus.ca>; "Frank Warmerdam" <warmerdam at pobox.com>
> Cc: <mapserver-users at lists.gis.umn.edu>
> Sent: Friday, January 30, 2004 6:51 PM
> Subject: RE: [Mapserver-users] I have some landsat 7 data that I want to
> tile : overlap + transparency
>
>
> Folks -
>
> The concept of a 300 dpi image from spatial imagery is nothing more than
> a convenient fiction. EVERY WMS command produces a 300 dpi image - at a
> certain output scale.
>
> You need to define one more variable - the geographic dimensions of a
> pixel. This will let you calculate the image size you want. Say, for
> example, you want to create a 300 dpi image in which each pixel
> represents 15 meters (in each dimension). This means each inch on the
> output product will be 300 x 15 meters, so your output scale is 1 inch =
> 300 x 15 meters or 1 inch = 300 x 15 x 39.37 inches - a scale of
> 1:177,165.
>
> If you'd like to do that, and produce a 6" x 6" 300 dpi image at a
> resolution of 15 meters per pixel, your WMS request asks for 6 x 300 x
> 15 or 27,000 meters in each dimension (in the BBOX parameter) and asks
> for a WIDTH and HEIGHT of 1,800 pixels (6 inches at 300 dpi).
>
> If you'd like the image to be 10 meters per pixel, or 30 meters per
> pixel, you would request a BBOX where delta X and delta Y were both
> 18,000 meters or 54,000 meters respectively.
>
> - Ed
>
> Ed McNierney
> President and Chief Mapmaker
> TopoZone.com
> -----Original Message-----
> From: Kralidis,Tom [Burlington] [mailto:Tom.Kralidis at ec.gc.ca]
> Sent: Friday, January 30, 2004 7:58 PM
> To: 'Stephen Clark'; Frank Warmerdam
> Cc: mapserver-users at lists.gis.umn.edu
> Subject: RE: [Mapserver-users] I have some landsat 7 data that I want to
> tile : overlap + transparency
>
>
>
> > -----Original Message-----
> > From: Stephen Clark [mailto:stephen.clark at focus.ca]
> > Sent: Friday, January 30, 2004 7:57 PM
> > To: Kralidis,Tom [Burlington]; Frank Warmerdam
> > Cc: mapserver-users at lists.gis.umn.edu
> > Subject: Re: [Mapserver-users] I have some landsat 7 data that I want
> > to tile : overlap + transparency
> >
> >
> > Tom,
> >
> > Is this the same as the CANIMAGE WMS layer from :
> >
> > "http://wms.cits.rncan.gc.ca/cgi-bin/cubeserv.cgi?"
> >
>
> The CanImage layer is a processed set, with no overlaps, at 15m
> resolution.
> The CCRS Landsat are band 743, as distributed by GeoGratis. Same base
> product, different pre-processing done to the data. IMHO, the CanImage
> product looks more seamless.
>
> > If so I already have this layer added to MapServer.
> >
> > My use of Landsat 7 Imagery is for a backdrop in my PDF files. But I
> > cannot get the WMS server to produce a 300 dpi image so I need to copy
>
> > them locally to produce the 300 dpi PDF files.
> >
> > Do you know of a WMS command that will produce an image ad a
> > particular DPI?
> >
>
> No, anyone else got an idea here?
>
> ..Tom
>
> > thanks
> > Stephen
> >
> > ----- Original Message -----
> > From: "Kralidis,Tom [Burlington]" <Tom.Kralidis at ec.gc.ca>
> > To: "'Stephen Clark'" <stephen.clark at focus.ca>; "Frank Warmerdam"
> > <warmerdam at pobox.com>
> > Cc: <mapserver-users at lists.gis.umn.edu>
> > Sent: Friday, January 30, 2004 2:59 PM
> > Subject: RE: [Mapserver-users] I have some landsat 7 data that I want
> > to tile : overlap + transparency
> >
> >
> > >
> > > Hi Stephen,
> > >
> > > What are your requirements for using the Landsat 7 Orthoimagery in
> > > MapServer?
> > >
> > > The CCRS WMS has the entire Landsat 7 Orthorectified Imagery
> > > collection, which is on GeoGratis, available as OGC:WMS:
> > >
> > > URL: http://ceoware2.ccrs.nrcan.gc.ca/cubewerx/cubeserv/cubeserv.cgi
> > > Layer name: L7O_B743:CEOWARE2
> > >
> > > Note that this layer is also timestamped, i.e. you can
> > query via TIME
> > > in OGC:WMS also. The scenes' black areas are transparent.
> > >
> > > Just thought it'd be easier to point to an OGC:WMS of this
> > data rather
> > than
> > > roll your own.
> > >
> > > Another comment: I'd be interested, as a separate exercise, how
> > > MapServer deals with overlapping images in a given layer.
> > What kind
> > > of algorithm is done between scenes which overlap?
> > >
> > > Thanks
> > >
> > > ..Tom
> > >
> > > =========================
> > > Tom Kralidis
> > > Systems Scientist
> > > Environment Canada
> > > Tel: +01-905-336-4409
> > > http://www.ec.gc.ca/cise/
> > >
> > > =========================
> > >
> > > > -----Original Message-----
> > > > From: Stephen Clark [mailto:stephen.clark at focus.ca]
> > > > Sent: Friday, January 30, 2004 6:52 PM
> > > > To: Frank Warmerdam
> > > > Cc: mapserver-users at lists.gis.umn.edu
> > > > Subject: Re: [Mapserver-users] I have some landsat 7 data that I
> > > > want to tile : overlap + transparency
> > > >
> > > >
> > > > Frank,
> > > >
> > > > My landsat data is from the Geogratis web site :
> > > >
> > > > http://geogratis.cgdi.gc.ca/download/landsat_7/ortho/geotiff/utm/
> > > >
> > > > Specifically these three scenes as example:
> > > >
> > > > http://geogratis.cgdi.gc.ca/download/landsat_7/ortho/geotiff/u
> > > > tm/047021/
> > > > http://geogratis.cgdi.gc.ca/download/landsat_7/ortho/geotiff/u
> > > > tm/048021/
> > > > http://geogratis.cgdi.gc.ca/download/landsat_7/ortho/geotiff/u
> > > > tm/049021/
> > > >
> > > > I compressed the files to ECW and produced this layer:
> > > >
> > > > LAYER
> > > > NAME landsat_048_021_rgb
> > > > DATA
> > > >
> > "d:/datasets/imagery/landsat/ecw/048021_0100_990804_l7_743_utm10.ecw"
> > > > TYPE RASTER
> > > > STATUS ON
> > > > TRANSPARENCY 60
> > > >
> > > > # turn off the black background in the image files
> > > > OFFSITE 0 0 0
> > > > END
> > > >
> > > >
> > > > >Do all the images have the same background value? YES
> > -- they do.
> > > > There is a residual amount of black fuzziness around the scenes
> > > > after using the above OFFSITE command.
> > > >
> > > > Here is a LAYER file for the tiled index of Landsat scenes:
> > > >
> > > > LAYER
> > > > NAME landsat_tile
> > > > TILEINDEX "d:/datasets/imagery/landsat/landsat_index.shp"
> > > > TILEITEM "location"
> > > > TYPE RASTER
> > > > STATUS ON
> > > > TRANSPARENCY 60
> > > >
> > > > # turn off the black background in the image files
> > > > OFFSITE 0 0 0
> > > >
> > > > METADATA
> > > > WMS_TITLE "Lansdat 7 Imagery "
> > > > WMS_ABSTRACT "N/A"
> > > > WMS_SRS "EPSG:26910"
> > > > END
> > > >
> > > > END
> > > >
> > > > But this tiled layer does not have any transparency. How would I
> > > > fix this?
> > > >
> > > > thanks
> > > > Stephen
> > > >
> > > > ----- Original Message -----
> > > > From: "Frank Warmerdam" <warmerdam at pobox.com>
> > > > To: "Stephen Clark" <stephen.clark at focus.ca>
> > > > Cc: <mapserver-users at lists.gis.umn.edu>
> > > > Sent: Friday, January 30, 2004 2:31 PM
> > > > Subject: Re: [Mapserver-users] I have some landsat 7 data that I
> > > > want to tile : overlap + transparency
> > > >
> > > >
> > > > > Stephen Clark wrote:
> > > > > > Hi All,
> > > > > >
> > > > > >
> > > > > > I have some landsat 7 data that I want to tile but the scenes
> > > > > > overlap.
> > > > > >
> > > > > > Can I use some sort of command that can be added to the
> > > > "gdaltindex"
> > > > > > command to add a transparency value to these scenes
> > so that the
> > > > > > overlap areas can show through.
> > > > >
> > > > > Stephen,
> > > > >
> > > > > Do all the images have the same background value? If
> > so, use it
> > > > > as the offsite value for the whole layer and it will be used
> > > > with all the
> > > > > images. The other alternative is to store the tiles in a format
> > > > > for which GDAL recognises "nodata" values, but this isn't very
> > > > convenient
> > > > > to arrange. There is no way to include nodata values in
> > the raster
> > > > > tile index.
> > > > >
> > > > > Best regards,
> > > > > --
> > > > >
> > > >
> > ---------------------------------------+----------------------------
> > > > ---------------------------------------+--
> > > > > ---------------------------------------+----
> > > > ----
> > > > > I set the clouds in motion - turn up | Frank Warmerdam,
> > > > warmerdam at pobox.com
> > > > > light and sound - activate the windows |
> > http://pobox.com/~warmerdam
> > > > > and watch the world go
> > round - Rush | Geospatial
> > > > Programmer for Rent
> > > > >
> > > > >
> > > > >
> > > >
> > > > _______________________________________________
> > > > Mapserver-users mailing list Mapserver-users at lists.gis.umn.edu
> > > > http://lists.gis.umn.edu/mailman/listinfo/maps> erver-users
> > > >
> > >
> >
> _______________________________________________
> Mapserver-users mailing list
> Mapserver-users at lists.gis.umn.edu
> http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
>
>
More information about the mapserver-users
mailing list