Buongiorno a tutti,
devo effettuare una unsupervised classification di una geotiff. La gdalinfo mi fornisce queste info:
Size is 7480, 5680
Coordinate System is:
PROJCS[“Roma_1940_Gauss_Boaga_Ovest”,
GEOGCS[“GCS_Roma_1940”,
DATUM[“Roma_1940”,
SPHEROID[“International_1924”,6378388.0,297.0]],
PRIMEM[“Greenwich”,0.0],
UNIT[“Degree”,0.0174532925199433]],
PROJECTION[“Transverse_Mercator”],
PARAMETER[“False_Easting”,1500000.0],
PARAMETER[“False_Northing”,0.0],
PARAMETER[“Central_Meridian”,9.0],
PARAMETER[“Scale_Factor”,0.9996],
PARAMETER[“Latitude_Of_Origin”,0.0],
UNIT[“Meter”,1.0]]
Origin = (2512520.000000000000000,4150280.000000000000000)
Pixel Size = (1.000000000000000,-1.000000000000000)
Metadata:
TIFFTAG_XRESOLUTION=71
TIFFTAG_YRESOLUTION=182
TIFFTAG_RESOLUTIONUNIT=1 (unitless)
Image Structure Metadata:
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left ( 2512520.000, 4150280.000) ( 20d21’ 5.14"E, 36d57’ 4.44"N)
Lower Left ( 2512520.000, 4144600.000) ( 20d20’38.00"E, 36d54’ 3.73"N)
Upper Right ( 2520000.000, 4150280.000) ( 20d26’ 1.59"E, 36d56’35.62"N)
Lower Right ( 2520000.000, 4144600.000) ( 20d25’34.26"E, 36d53’34.96"N)
Center ( 2516260.000, 4147440.000) ( 20d23’19.75"E, 36d55’19.72"N)
Band 1 Block=7480x1 Type=Byte, ColorInterp=Red
Overviews: 1496x1136
Metadata:
LAYER_TYPE=athematic
Band 2 Block=7480x1 Type=Byte, ColorInterp=Green
Overviews: 1496x1136
Metadata:
LAYER_TYPE=athematic
Band 3 Block=7480x1 Type=Byte, ColorInterp=Blue
Overviews: 1496x1136
Metadata:
LAYER_TYPE=athematic
Warning 1: TIFFReadDirectory:Unknown field with tag 33919 (0x847f) encountered
Ho effettuato le seguenti operazioni:
- r.in.gdal
- i.group
- i.cluster
i.cluster group=gruppo subgroup=sottogruppo sigfile=sign classes=5 iterations=30 convergence=98.0 separation=0.0 min_size=17
mi dà il seguente errore:
ERRORE: Not enough sample points. Please run again and choose a larger sample size.
Ho impostato dunque il parametro sample ma qualunque valore io metta(a parte 1,1) mi viene dato il seguente errore:
ERRORE: Illegal value(s) of sample intervals
Che volere devo impostare?Come faccio a scegliere un intervallo di campionamento?
grazie per la disponibilità
Pietro Arena