Evan,
For the original PDF, gdalinfo shows:
Driver: PDF/Geospatial PDF
Files: my.pdf
Size is 7487, 5229
Coordinate System is:
PROJCS["WGS_1984_UTM_Zone_35N",
GEOGCS["GCS_WGS_1984",
DATUM["WGS_1984",
SPHEROID["WGS_1984",6378137.0,298.257223563]],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]],
PROJECTION["Transverse_Mercator"],
PARAMETER["False_Easting",500000.0],
PARAMETER["False_Northing",0.0],
PARAMETER["Central_Meridian",27.0],
PARAMETER["Scale_Factor",0.9996],
PARAMETER["Latitude_Of_Origin",0.0],
UNIT["Meter",1.0]]
GeoTransform =
208685.3477667082, 91.60344342730002, -9.686865691546485e-005
4840743.141406364, -0.0003005644555746527, -103.1065102766238
Corner Coordinates:
Upper Left ( 208685.348, 4840743.141) ( 23d23'13.21"E, 43d39'45.29"N)
Lower Left ( 208684.841, 4301599.199) ( 23d38'41.63"E, 38d48'54.07"N)
Upper Right ( 894520.329, 4840740.891) ( 31d53'20.40"E, 43d36'54.07"N)
Lower Right ( 894519.822, 4301596.949) ( 31d32'26.52"E, 38d46'29.57"N)
Center ( 551602.585, 4571170.045) ( 27d36'58.63"E, 41d17'25.18"N)
Band 1 Block=7487x1 Type=Byte, ColorInterp=Red
Band 2 Block=7487x1 Type=Byte, ColorInterp=Green
Band 3 Block=7487x1 Type=Byte, ColorInterp=Blue
and the resulting Geotiff is:
Driver: GTiff/GeoTIFF
Files: my.tif
Size is 7487, 5229
Coordinate System is:
PROJCS["WGS 84 / UTM zone 35N",
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"]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",0],
PARAMETER["central_meridian",27],
PARAMETER["scale_factor",0.9996],
PARAMETER["false_easting",500000],
PARAMETER["false_northing",0],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","32635"]]
GeoTransform =
208685.3477667082, 91.60344342730002, -9.686865691546485e-005
4840743.141406364, -0.0003005644555746527, -103.1065102766238
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left ( 208685.348, 4840743.141) ( 23d23'13.21"E, 43d39'45.29"N)
Lower Left ( 208684.841, 4301599.199) ( 23d38'41.63"E, 38d48'54.07"N)
Upper Right ( 894520.329, 4840740.891) ( 31d53'20.40"E, 43d36'54.07"N)
Lower Right ( 894519.822, 4301596.949) ( 31d32'26.52"E, 38d46'29.57"N)
Center ( 551602.585, 4571170.045) ( 27d36'58.63"E, 41d17'25.18"N)
Band 1 Block=7487x1 Type=Byte, ColorInterp=Red
Band 2 Block=7487x1 Type=Byte, ColorInterp=Green
Band 3 Block=7487x1 Type=Byte, ColorInterp=Blue
After gdalwarp:
Driver: GTiff/GeoTIFF
Files: gdalwarp.tif
Size is 7179, 5644
Coordinate System is:
PROJCS["WGS 84 / UTM zone 35N",
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"]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",0],
PARAMETER["central_meridian",27],
PARAMETER["scale_factor",0.9996],
PARAMETER["false_easting",500000],
PARAMETER["false_northing",0],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","32635"]]
Origin = (208684.841232902890000,4840743.141386642100000)
Pixel Size = (95.527649479168488,-95.527649479168488)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left ( 208684.841, 4840743.141) ( 23d23'13.19"E, 43d39'45.29"N)
Lower Left ( 208684.841, 4301585.088) ( 23d38'41.65"E, 38d48'53.62"N)
Upper Right ( 894477.837, 4840743.141) ( 31d53'18.52"E, 43d36'54.23"N)
Lower Right ( 894477.837, 4301585.088) ( 31d32'24.76"E, 38d46'29.25"N)
Center ( 551581.339, 4571164.115) ( 27d36'57.71"E, 41d17'24.99"N)
Band 1 Block=7179x1 Type=Byte, ColorInterp=Red
Band 2 Block=7179x1 Type=Byte, ColorInterp=Green
Band 3 Block=7179x1 Type=Byte, ColorInterp=Blue
Doing the math on a 1:75k map, at 150 dpi the pixel size should be about
12.7 meters.
Brent
On 10/19/2010 12:45 PM, Even Rouault wrote:
Brent,
I'm not sure what you find is wrong. What does gdalinfo returns ?
The PDF driver will reproject the coordinates of the GPTS array from
geographic into UTM 35N and try to build a geotransform matrix from that. The
matrix may have rotating terms, so you likely need to use gdalwarp afterwards
to make it look "straight". However I'm not 100% sure this is the correct way
to interpret the the Adobe style georeferencing, but I didn't find a better one
up to know. So if you or someone else have any clue...
Most geospatial PDFs I've found in the wild (such as the one of cantopo) seem
to use the OGC Best Practice encoding.
Even
Le mardi 19 octobre 2010 20:11:13, Brent Fraser a écrit :
Even,
I've tested a couple of Geospatial PDFs with the code that's in GDAL
trunk.
The Canadian topos work well (e.g.
ftp://ftp2.cits.rncan.gc.ca/pub/cantopo/50k_geopdf/085/b/cantopo_085b14_geo
pdf.zip). They were produced using ESRI ArcMap 9.2.6.1500. I get a
properly geo-referenced GeoTiff after running gdal_translate.
I have another PDF produced by ArcMap10.0.0.2414. It has a main map
and a keymap. The strange thing is that even though the coordinate
system is UTM Zone 35 , it has a transformation matrix with geographic
coordinates given. Here's a portion of the "dump" file:
Item[4] : VP
Type = array
Item[0]:
Type = dictionary
Item[0] : Name = ÿþI (string)
Item[1] : Measure
Type = dictionary
Item[0] : Subtype = GEO (name)
Item[1] : LPTS
Type = array
Item[0]: 0 (int)
Item[1]: 1 (int)
Item[2]: 0 (int)
Item[3]: 0 (int)
Item[4]: 1 (int)
Item[5]: 0 (int)
Item[6]: 1 (int)
Item[7]: 1 (int)
Item[2] : GPTS
Type = array
Item[0]: 38.815000 (real)
Item[1]: 23.644900 (real)
Item[2]: 43.662600 (real)
Item[3]: 23.387000 (real)
Item[4]: 43.615000 (real)
Item[5]: 31.889000 (real)
Item[6]: 38.774900 (real)
Item[7]: 31.540700 (real)
Item[3] : GCS
Type = dictionary
Item[0] : WKT =
PROJCS["WGS_1984_UTM_Zone_35N",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPH
EROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["De
gree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["Fal
se_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Me
ridian",27.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origi
n",0.0],UNIT["Meter",1.0]] (string)
Item[1] : Type = PROJCS (name)
Item[4] : Type = Measure (name)
Item[5] : Bounds
Type = array
Item[0]: 0 (int)
Item[1]: 1 (int)
Item[2]: 0 (int)
Item[3]: 0 (int)
Item[4]: 1 (int)
Item[5]: 0 (int)
Item[6]: 1 (int)
Item[7]: 1 (int)
Item[2] : Type = Viewport (name)
Item[3] : BBox
Type = array
Item[0]: 3168 (int)
Item[1]: 2433 (int)
Item[2]: 3557 (int)
Item[3]: 2127 (int)
Item[1]:
Type = dictionary
Item[0] : Name = ÿþA (string)
Item[1] : Measure
Type = dictionary
Item[0] : Subtype = GEO (name)
Item[1] : LPTS
Type = array
Item[0]: 0 (int)
Item[1]: 1 (int)
Item[2]: 0 (int)
Item[3]: 0 (int)
Item[4]: 1 (int)
Item[5]: 0 (int)
Item[6]: 1 (int)
Item[7]: 1 (int)
Item[2] : GPTS
Type = array
Item[0]: 40.190600 (real)
Item[1]: 26.279300 (real)
Item[2]: 40.767200 (real)
Item[3]: 26.273100 (real)
Item[4]: 40.769300 (real)
Item[5]: 27.212000 (real)
Item[6]: 40.192600 (real)
Item[7]: 27.210200 (real)
Item[3] : GCS
Type = dictionary
Item[0] : WKT =
PROJCS["WGS_1984_UTM_Zone_35N",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPH
EROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["De
gree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["Fal
se_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Me
ridian",27.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origi
n",0.0],UNIT["Meter",1.0]] (string)
Item[1] : Type = PROJCS (name)
Item[4] : Type = Measure (name)
Item[5] : Bounds
Type = array
Item[0]: 0 (int)
Item[1]: 1 (int)
Item[2]: 0 (int)
Item[3]: 0 (int)
Item[4]: 1 (int)
Item[5]: 0 (int)
Item[6]: 1 (int)
Item[7]: 1 (int)
Item[2] : Type = Viewport (name)
Item[3] : BBox
Type = array
Item[0]: 57 (int)
Item[1]: 2465 (int)
Item[2]: 3052 (int)
Item[3]: 46 (int)
------------------------
The resulting GeoTiff has a scaling problem, I suspect related to the
transformation matrix.
Any thoughts on that?
Thanks!
Brent Fraser
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