I have some Tiff files in EPSG:26915 (UTM 15 N) which I am requesting via WMS in EPSG:4326 to display on a map.
When the image is reprojected, it is rotated and the padding area added to make the image rectangular again has its value set to 0 instead of to the No Data value.
Since my image also has actual values of 0, this means that the new padding which should be set to No Data (and rendered transparent) is instead rendered with a color as though it had data.
This screenshot makes it clear what I mean: Screenshot: http://s31.postimg.org/5f96rqvi3/what_am_i_doing_wrong.png
Has anyone seen this? Am I doing something wrong? I tried searching, but I might not be describing it correctly in my searches. The best I could do was this 7 year old GDAL ticket: https://trac.osgeo.org/gdal/ticket/2724
Thanks,
Michael
Other info that might be relavant:
GeoServer Build Information
Version 2.8.3
Git Revision 1c8c9ba0f74a465c397d46cf19d3b34b95b2fb6e
Build Date 22-Mar-2016 21:12
GeoTools Version 14.3 (rev 2298d56000bef6f526b521a480316ea544c74571)
GeoWebCache Version 1.8.2 (rev 1.8.x/442d5127d1a01942f4c04c8140ade4c4538bb16d)
This is running on Windows Server 2012 (64 bit), but running 32 bit GeoServer and 32 bit java.
My WMS request looks like this:
The GeoServer log for that request looks like this:
2016-04-22 09:34:37,549 INFO [geoserver.wms] -
Request: getMap
Filters = null
BgColor = java.awt.Color[r=255,g=255,b=255]
SRS = EPSG:4326
Tiled = false
Palette = null
FeatureVersion = null
Styles = [StyleImpl[ name=rainbowstatic]]
Layers = [org.geoserver.wms.MapLayerInfo@anonymised.com]
MaxFeatures = null
Angle = 0.0
Crs = GEOGCS[“WGS 84”,
DATUM[“World Geodetic System 1984”,
SPHEROID[“WGS 84”, 6378137.0, 298.257223563, AUTHORITY[“EPSG”,“7030”]],
AUTHORITY[“EPSG”,“6326”]],
PRIMEM[“Greenwich”, 0.0, AUTHORITY[“EPSG”,“8901”]],
UNIT[“degree”, 0.017453292519943295],
AXIS[“Geodetic longitude”, EAST],
AXIS[“Geodetic latitude”, NORTH],
AUTHORITY[“EPSG”,“4326”]]
Bbox = SRSEnvelope[MyBbox]
Env = {}
StartIndex = null
CQLFilter = null
RemoteOwsURL = null
ViewParams = null
FormatOptions = {}
FeatureId = null
RemoteOwsType = null
Elevation =
Sld = null
ValidateSchema = false
Interpolations =
Transparent = true
StyleFormat = sld
StyleUrl = null
SldBody = null
TilesOrigin = null
Exceptions = SE_XML
StyleVersion = null
SldVersion = null
StyleBody = null
ScaleMethod = null
Time =
Height = 769
Width = 331
Format = image/png8
Buffer = 0
Filter = null
Request = GetMap
BaseUrl = http://MyServer/geoserver/
RawKvp = {REQUEST=GetMap, FORMAT=image/png8, SRS=EPSG:4326, BBOX=MyBBox, VERSION=1.1.1, STYLES=rainbowstatic, SERVICE=WMS, WIDTH=331, HEIGHT=769, TRANSPARENT=true, LAYERS=MyLayer}
Get = true
RequestCharset = UTF-8
Version = 1.1.1
Gdalinfo reports the following for the source .tiff image:
Driver: GTiff/GeoTIFF
Files: 0-0-62.tiff
Size is 247, 229
Coordinate System is:
PROJCS[“NAD83 / UTM zone 15N”,
GEOGCS[“NAD83”,
DATUM[“North_American_Datum_1983”,
SPHEROID[“GRS 1980”,6378137,298.257222101,
AUTHORITY[“EPSG”,“7019”]],
TOWGS84[0,0,0,0,0,0,0],
AUTHORITY[“EPSG”,“6269”]],
PRIMEM[“Greenwich”,0,
AUTHORITY[“EPSG”,“8901”]],
UNIT[“degree”,0.0174532925199433,
AUTHORITY[“EPSG”,“9122”]],
AUTHORITY[“EPSG”,“4269”]],
PROJECTION[“Transverse_Mercator”],
PARAMETER[“latitude_of_origin”,0],
PARAMETER[“central_meridian”,-93],
PARAMETER[“scale_factor”,0.9996],
PARAMETER[“false_easting”,500000],
PARAMETER[“false_northing”,0],
UNIT[“metre”,1,
AUTHORITY[“EPSG”,“9001”]],
AXIS[“Easting”,EAST],
AXIS[“Northing”,NORTH],
AUTHORITY[“EPSG”,“26915”]]
Origin = (myOrigin,myOrigin)
Pixel Size = (3.000000000000000,-3.000000000000000)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( xxxxxx.xxx, xxxxxx.xxx) ( xxd x’xx.xx"W, xxdxx’xx.xx"N)
Lower Left ( xxxxxx.xxx, xxxxxx.xxx) ( xxd x’xx.xx"W, xxdxx’xx.xx"N)
Upper Right ( xxxxxx.xxx, xxxxxx.xxx) ( xxd x’xx.xx"W, xxdxx’xx.xx"N)
Lower Right ( xxxxxx.xxx, xxxxxx.xxx) ( xxd x’xx.xx"W, xxdxx’xx.xx"N)
Center ( xxxxxx.xxx, xxxxxx.xxx) ( xxd x’xx.xx"W, xxdxx’xx.xx"N)
Band 1 Block=247x8 Type=Float32, ColorInterp=Gray
NoData Value=1.701410009187828e+038
