Hi,
Peter, thanks for your hint. I tried to split the tiff into small pieces. But
also no success.
Here is the gdalinfo of my first, big GTiff:
Driver: GTiff/GeoTIFF
Files: srtm_39_03_900913_hillshade.tif
Size is 18555, 27490
Coordinate System is:
PROJCS["unnamed",
GEOGCS["unnamed ellipse",
DATUM["unknown",
SPHEROID["unnamed",6378137,0]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433]],
PROJECTION["Mercator_1SP"],
PARAMETER["central_meridian",0],
PARAMETER["scale_factor",1],
PARAMETER["false_easting",0],
PARAMETER["false_northing",0],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]]]
Origin = (1113148.557154602400000,6446203.744899881100000)
Pixel Size = (30.000000000000000,-30.000000000000000)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 1113148.557, 6446203.745) ( 9d59'58.50"E, 49d59'58.50"N)
Lower Left ( 1113148.557, 5621503.745) ( 9d59'58.50"E, 44d59'59.59"N)
Upper Right ( 1669798.557, 6446203.745) ( 15d 0'0.20"E, 49d59'58.50"N)
Lower Right ( 1669798.557, 5621503.745) ( 15d 0'0.20"E, 44d59'59.59"N)
Center ( 1391473.557, 6033853.745) ( 12d29'59.35"E, 47d33'33.59"N)
Band 1 Block=18555x1 Type=Byte, ColorInterp=Gray
NoData Value=32767
and here the gdalinfo of one of the small pieces:
Driver: GTiff/GeoTIFF
Files: srtm_39_03_900913_hillshade_oa.tif
Size is 1812, 1976
Coordinate System is:
PROJCS["unnamed",
GEOGCS["unnamed ellipse",
DATUM["unknown",
SPHEROID["unnamed",6378137,0]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433]],
PROJECTION["Mercator_1SP"],
PARAMETER["central_meridian",0],
PARAMETER["scale_factor",1],
PARAMETER["false_easting",0],
PARAMETER["false_northing",0],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]]]
Origin = (1114078.557154602400000,6054943.744899881100000)
Pixel Size = (30.000000000000000,-30.000000000000000)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 1114078.557, 6054943.745) ( 10d 0'28.58"E, 47d41'13.28"N)
Lower Left ( 1114078.557, 5995663.745) ( 10d 0'28.58"E, 47d19'38.31"N)
Upper Right ( 1168438.557, 6054943.745) ( 10d29'46.54"E, 47d41'13.28"N)
Lower Right ( 1168438.557, 5995663.745) ( 10d29'46.54"E, 47d19'38.31"N)
Center ( 1141258.557, 6025303.745) ( 10d15'7.56"E, 47d30'26.91"N)
Band 1 Block=1812x4 Type=Byte, ColorInterp=Gray
NoData Value=32767
The SRS of my map is:
<Map srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0
+y_0=0 +k=1.0 +units=m [EMAIL PROTECTED] +no_defs +over">
I generate the map with TileCache and the hillshading was generated using the
instructions of this site:
http://wiki.openstreetmap.org/wiki/HikingBikingMaps#Hill_Shading
My idea was, to merge all my DEM-tiles (covering almost whole Europe) to a
BigTiff and then generate one big shaded relief with pyramids, one for every
zoomlevel. I want to avoid using dozens of layers only for the shading. Is that
a wrong way? I liked the possibility to use an image mosaic in Mapserver or
Geoserver. I didn't found a similar way together with gdal.
regards
Jürgen
-------- Original Message --------
Subject: Re: [Mapnik-users] Problems with raster data (01-Dez-2008 21:57)
From: BP <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
> Hi!
>
> I'm a newbee working on a project to make a good looking map based on
> turistautak.hu database (it is about hiking trails). It is still under
> development on a temporary site. (peterbus.extra.hu/tuhu)
> Anyway I had the same problem. The GeoTiff was too big.
> My solution was to slice it up (or merge smaller bounds from srtm) and
> feed in several layers.
> At least it worked for me. (It is not uploaded yet to the site)
>
> Regards
> Peter
>
> spillocaster írta:
> > Hi all,
> >
> > I was testing now a couple of hours, but I can't find the problem. I simply
> > want to display a shading with a GeoTiff, but it doesn't work.
> >
> > My XML-Style:
> > <Style name="raster">
> > <Rule>
> > <RasterSymbolizer>
> > </RasterSymbolizer>
> > </Rule>
> > </Style>
> >
> > My Layer:
> > <Layer name="shading" status="on" srs="+proj=merc +a=6378137 +b=6378137
> > +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m [EMAIL PROTECTED]
> > +no_defs +over">
> > <StyleName>raster</StyleName>
> > <Datasource>
> > <Parameter name="type">gdal</Parameter>
> > <Parameter
> > name="file">/mapnik/data/raster/39_03_900913_hillshade.tif</Parameter>
> > <Parameter name="format">tiff</Parameter>
> > </Datasource>
> > </Layer>
> >
> > My system:
> > Debian-linux 2.6.24-etchnhalf.1-686
> >
> > My map projection is in spherical mercator and so I warped my rasterfile
> > also to the same srs. With "tiffinfo" on my GeoTiff, I get this info:
> >
> > TIFFReadDirectory: Warning, Unknown field with tag 33550 (0x830e)
> > encountered.
> > TIFFReadDirectory: Warning, Unknown field with tag 33922 (0x8482)
> > encountered.
> > TIFFReadDirectory: Warning, Unknown field with tag 34735 (0x87af)
> > encountered.
> > TIFFReadDirectory: Warning, Unknown field with tag 34736 (0x87b0)
> > encountered.
> > TIFFReadDirectory: Warning, Unknown field with tag 34737 (0x87b1)
> > encountered.
> > TIFFReadDirectory: Warning, Unknown field with tag 42113 (0xa481)
> > encountered.
> > TIFF Directory at offset 0x1e6a83b8 (510297016)
> > Image Width: 18555 Image Length: 27490
To: [EMAIL PROTECTED]
Cc: [email protected]
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