[mapserver-users] Projections and raster files
David Power
David.Power at cs.ox.ac.uk
Thu Aug 29 08:00:35 PDT 2013
Hello,
I have a number of geotiffs which are currently using epsg:4326 and I would like to output a region using epsg:3857.
I am new to mapserver but from what I have read the way achieve this is by setting the projection of the map to epsg:3857 and the layer to epsg:4326.
When I set the projections to the same value I get the output I expect without a problem, if I set the projections to different values I do not get an error but the output is blank.
To make life more complicated I am using mapscript via the Java swig interface, the version of mapserver I am using is mapserver 6.1.2.1 which I built from source.
If anybody has any advice I would be most grateful.
David
-
gdalinfo gives the following information about one of the files:
Driver: GTiff/GeoTIFF
Files: globcover_n10e005.tif
Size is 7200, 7200
Coordinate System is:
GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.257223563,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4326"]]
Origin = (5.000000000000000,9.999999999999615)
Pixel Size = (0.000138888888889,-0.000138888888889)
Metadata:
DataType=Generic
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 5.0000000, 10.0000000) ( 5d 0'0.00"E, 10d 0'0.00"N)
Lower Left ( 5.0000000, 9.0000000) ( 5d 0'0.00"E, 9d 0'0.00"N)
Upper Right ( 6.0000000, 10.0000000) ( 6d 0'0.00"E, 10d 0'0.00"N)
Lower Right ( 6.0000000, 9.0000000) ( 6d 0'0.00"E, 9d 0'0.00"N)
Center ( 5.5000000, 9.5000000) ( 5d30'0.00"E, 9d30'0.00"N)
Band 1 Block=7200x128 Type=Byte, ColorInterp=Gray
NoData Value=0
-
The map file is built programmatically, the following is the result of saving the map object to file:
MAP
EXTENT 5 9.9 5.1 10
IMAGETYPE "png"
NAME "blank"
SIZE 800 800
STATUS ON
UNITS DD
OUTPUTFORMAT
NAME "png"
MIMETYPE "image/png"
DRIVER "AGG/PNG"
EXTENSION "png"
IMAGEMODE RGB
TRANSPARENT FALSE
END # OUTPUTFORMAT
PROJECTION
"init=epsg:3857"
END # PROJECTION
LEGEND
KEYSIZE 20 10
KEYSPACING 5 5
LABEL
SIZE MEDIUM
OFFSET 0 0
SHADOWSIZE 1 1
TYPE BITMAP
END # LABEL
STATUS OFF
END # LEGEND
QUERYMAP
SIZE -1 -1
STATUS OFF
STYLE HILITE
END # QUERYMAP
SCALEBAR
INTERVALS 4
LABEL
SIZE MEDIUM
OFFSET 0 0
SHADOWSIZE 1 1
TYPE BITMAP
END # LABEL
SIZE 200 3
STATUS OFF
UNITS MILES
END # SCALEBAR
WEB
END # WEB
LAYER
DATA "/home/leftworker/data/landcover/lefttiles/n10/globcover_n10e005.tif"
NAME "n10e005"
PROJECTION
"init=epsg:4326"
END # PROJECTION
STATUS ON
TILEITEM "location"
TYPE RASTER
UNITS DD
END # LAYER
END # MAP
======================================
Dr David J Power
Research Officer
Department of Computer Science
University of Oxford
tel: 01865 283670
email: David.Power at cs.ox.ac.uk
======================================
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