I've fixed this on trunk now. But for the time being you can add:
TOWGS84[0,0,0,0,0,0,0]
to the .prj file I think you have to put it in the datum section.
Here's an example:
PROJCS["NAD83 / BC Albers",
GEOGCS["NAD83",
DATUM["North_American_Datum_1983",
SPHEROID["GRS1980",6378137,298.257222101,
AUTHORITY["EPSG","7019"]],
TOWGS84[0,0,0],
AUTHORITY["EPSG","6269"]],
PRIMEM["Greenwich",0,
AUTHORITY["EPSG","8901"]],
UNIT["degree",0.01745329251994328,
AUTHORITY["EPSG","9122"]],
AUTHORITY["EPSG","4269"]],
PROJECTION["Albers_Conic_Equal_Area"],
PARAMETER["standard_parallel_1",50],
PARAMETER["standard_parallel_2",58.5],
PARAMETER["latitude_of_center",45],
PARAMETER["longitude_of_center",-126],
PARAMETER["false_easting",1000000],
PARAMETER["false_northing",0],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","3005"]]
Jesse
On 15-Mar-06, at 2:35 PM, Christopher Hammack wrote:
Thanks for looking into this.
I've been doing some more work, and during a lot of my attempts to
reproject data I get "Bursa Wolf Parameter" errors. From reading
along, I got the impression this is due to a lack of data about
projections and this might be solved in a future release by getting
better EPSG data (??).
Is there any temporary workaround to manually provide the parameters
that it's looking for?
I did some experimenting yesterday and found that raster
reprojection
was taking place with world+image files, but it wasn't very good,
I'm
not sure why. I reprojected a map of victoria in BC_Albers to
WGS_84
and there was definate reprojection taking place, but it did not
line
up well with the reprojected shapefile. I'll keep digging.
With regards to WMS, Server side reprojection is attempted first
and
if that fails raster reprojection is performed within uDig. So it
depends on the server and what reprojections take place.
Jesse
On 15-Mar-06, at 6:59 AM, Christopher Hammack wrote:
Thanks for looking into this. I'm not seeing very good results--
my
images are simply png+worldfiles that I create georesources from. I
have tried with and without setting the layer's CRS.
I just tried using a WMS server (JPL's server listed on the test
server
list), and I saw good results in reprojection to Lambert Conic and
Mercator.
So am I correct in assuming that reprojection works for WMS but
not
for
worldfile rasters? Or is the WMS server doing the projection on
the
server side (sorry, not familiar with how WMS works)?
I've spent a few hours today looking through the code and I can
verify that raster reprojection is happening during rendering...
It
isn't perfect I admit but more cannot be done at the moment, at
least
not until the new coverage support is finished being added to
geotools. I noticed now (the second read through) that you
mentioned calling layer.setCRS(). This isn't intended to do any
reprojection. Instead it is a way to declare what projection the
layer is in. This was provided for the cases where there was no
projection file or the projection file is wrong. Instead only the
viewportModel's setCRS will affect the rendering.
Jesse
On 14-Mar-06, at 11:32 AM, Christopher Hammack wrote:
I've read some messages recently regarding raster reprojection,
but
I've yet to hear confirmation as to exactly what should be
working.
If I create a map that is Lambert Conformal Conic (by calling the
ViewportModelInternal's setCRS method), vector data (e.g.
shapefiles,
gml, etc.) look great.
However, if I take a raster image, with a standard projection,
create a
layer from it and call setCRS on the layer, I see no reprojection.
Looking at geotools code, it appears there is the capability to
reproject rasters by breaking them into tiles, etc. Perhaps I
have
misunderstood this, however.
As one might expect, the non-projected raster is roughly in the
right
area, but is considerably off.
Any suggestions? Thanks.
--
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
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_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
--
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
--
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
