On Tue, May 22, 2012 at 10:28 AM, Joe Larson <[email protected]> wrote: > hello OAM community! > > We have processed public domain 12-inch imagery acquired last year, > for our entire County & significant areas of 6-inch imagery through > the OpenAerialMap workflow. About 50GB worth. > > We have a place to house the imagery, at Cal Poly - on a Computer > Science Department SAN. > > Some questions have come up, I wanted to ask those here. Also wanted > to have some of you `pro's` take a look at some sample tiles. > > Here's a 6-inch: http://dl.dropbox.com/u/38388156/5622_2426.tif > Here's a 12-inch: http://dl.dropbox.com/u/38388156/5622_2426.tif
As best as I can tell, the above links are exactly the same. > One question that's come up..The imagery's original SRS is EPSG:2229 > and we think we should have applied a step in the creation-workflow to > add an alpha with the warp to 4326. This would get rid of the black > collars? And does this seem necessary? I see you do have a nodata mask for 5622_2426.tif which seems to be working properly for the above file so I'm guessing you do not need an additional alpha mask. > Not sure if this is useful, but we loaded a draft-set of the imagery > into a MapServer/MapProxy WMS - here's what it looks like > http://mapproxy.slocountyfire.org/demo/?srs=EPSG%3A4326&format=image%2Fjpeg&wms_layer=slocounty-12in I do see painful tile edge white slivers that seem to indicate some sort of masking problem. I'm not sure if it is in a processing step after the 5622_2426.tif or in MapServer. Modern MapServer should honour the nodata mask in the .tif file you provided. I will note that your overviews appear to be created with nearest neighbour downsampling which, I think, is not as visually pleasing as averaging. Consider using -r average when you run gdaladdo. Nice to see a great dataset so nearby! Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, [email protected] light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Software Developer _______________________________________________ talk mailing list [email protected] http://host134.hostmonster.com/mailman/listinfo/talk_openaerialmap.org
