错误原因:Float32 is not supported for rendering。即栅格数据类型Float32不支持。

cmd中用GDAL查看。在波段中的数据类型是Float32的不支持渲染。

不支持的例子:

C:\Program Files\GDAL>gdalinfo D:\mapnik\mapnik-v2.2.0\shp\mapnik\tmean10_19.tif
Driver: GTiff/GeoTIFF
Files: D:\mapnik\mapnik-v2.2.0\shp\mapnik\tmean10_19.tif
Size is 3600, 3600
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 = (90.000000000000000,60.000000000000000)
Pixel Size = (0.008333333333333,-0.008333333333333)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
COMPRESSION=LZW
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 90.0000000, 60.0000000) ( 90d 0' 0.00"E, 60d 0' 0.00"N)
Lower Left ( 90.0000000, 30.0000000) ( 90d 0' 0.00"E, 30d 0' 0.00"N)
Upper Right ( 120.0000000, 60.0000000) (120d 0' 0.00"E, 60d 0' 0.00"N)
Lower Right ( 120.0000000, 30.0000000) (120d 0' 0.00"E, 30d 0' 0.00"N)
Center ( 105.0000000, 45.0000000) (105d 0' 0.00"E, 45d 0' 0.00"N)
Band 1 Block=3600x1 Type=Float32, ColorInterp=Gray
NoData Value=-3.3999999521443642e+038

postgres查看:

CONSTRAINT enforce_pixel_types_rast CHECK (_raster_constraint_pixel_types(rast) = '{32BF}'::text[]),

支持的例子:

Driver: GTiff/GeoTIFF
Files: D:\mapnik\mapnik-v2.2.0\shp\mapnik\HYP_LR.tif
Size is 16200, 8100
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 = (-180.000000000000000,90.000000000000000)
Pixel Size = (0.022222222222220,-0.022222222222220)
Metadata:
AREA_OR_POINT=Area
TIFFTAG_DATETIME=2014:10:18 12:08:22
TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
TIFFTAG_SOFTWARE=Adobe Photoshop CC 2014 (Macintosh)
TIFFTAG_XRESOLUTION=231.429
TIFFTAG_YRESOLUTION=231.429
Image Structure Metadata:
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left (-180.0000000, 90.0000000) (180d 0' 0.00"W, 90d 0' 0.00"N)
Lower Left (-180.0000000, -90.0000000) (180d 0' 0.00"W, 90d 0' 0.00"S)
Upper Right ( 180.0000000, 90.0000000) (180d 0' 0.00"E, 90d 0' 0.00"N)
Lower Right ( 180.0000000, -90.0000000) (180d 0' 0.00"E, 90d 0' 0.00"S)
Center ( -0.0000000, 0.0000000) ( 0d 0' 0.00"W, 0d 0' 0.00"N)
Band 1 Block=16200x1 Type=Byte, ColorInterp=Red
Band 2 Block=16200x1 Type=Byte, ColorInterp=Green
Band 3 Block=16200x1 Type=Byte, ColorInterp=Blue

postgres查看:

CONSTRAINT enforce_pixel_types_rast CHECK (_raster_constraint_pixel_types(rast) = '{8BUI,8BUI,8BUI}'::text[]),

pgraster插件源码查看/mapnik/plugins/input/pgraster/pgraster_wkb_reader.cpp

switch (pixtype) {
case PT_1BB:
case PT_2BUI:
case PT_4BUI:
// all <8BPP values are wrote in full bytes anyway
case PT_8BSI:
// mapnik does not support signed anyway
case PT_8BUI:
return read_grayscale_band(bbox, width_, height_, hasnodata,
std::bind(read_uint8, &ptr_));
break;
case PT_16BSI:
// mapnik does not support signed anyway
case PT_16BUI:
return read_grayscale_band(bbox, width_, height_, hasnodata,
std::bind(read_uint16, &ptr_, endian_));
break;
case PT_32BSI:
// mapnik does not support signed anyway
case PT_32BUI:
return read_grayscale_band(bbox, width_, height_, hasnodata,
std::bind(read_uint32, &ptr_, endian_));
break;
default:
std::ostringstream err;
err << "pgraster_wkb_reader: grayscale band type "
<< pixtype << " unsupported";
//MAPNIK_LOG_WARN(pgraster) << err.str();
throw mapnik::datasource_exception(err.str());
}

这里可以发现支持的格式类型,满足这些类型就行,否则报错。

https://github.com/mapnik/mapnik/issues/3324

https://github.com/systemapic/pile/issues/30

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