// *** constructors *******************************************************
/// <summary> Constructs a <tt>Grib1IndicatorSection</tt> object from a byteBuffer.
///
/// </summary>
/// <param name="raf">RandomAccessFile with IndicatorSection content
///
/// </param>
/// <throws> NotSupportedException if raf contains no valid GRIB file </throws>
/// <throws> IOException </throws>
//UPGRADE_TODO: Class 'java.io.RandomAccessFile' was converted to 'System.IO.FileStream' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javaioRandomAccessFile'"
public Grib1IndicatorSection(System.IO.FileStream raf)
{
long mark = raf.Position;
//if Grib edition 1, get bytes for the gribLength
int[] data = new int[3];
for (int i = 0; i < 3; i++)
{
data[i] = raf.ReadByte();
}
//System.out.println( "data[]=" + data[0] +", "+ data[1]+", "+data[2] ) ;
// edition of GRIB specification
edition = raf.ReadByte();
//System.out.println( "edition=" + edition ) ;
if (edition == 1)
{
// length of GRIB record
// Reset to beginning, then read 3 bytes
raf.Position = mark;
gribLength = (long)GribNumbers.uint3(raf);
// Skip next byte, edition already read
raf.ReadByte();
//System.out.println( "edition 1 gribLength=" + gribLength ) ;
length = 8;
}
else if (edition == 2)
{
// length of GRIB record
discipline = data[2];
//System.out.println( "discipline=" + discipline) ;
gribLength = GribNumbers.int8(raf);
//System.out.println( "editon 2 gribLength=" + gribLength) ;
length = 16;
}
else
{
throw new NotSupportedException("GRIB edition " + edition + " is not yet supported");
}
} // end Grib1IndicatorSection
/// <summary> Constructs a <tt> Grib1BitMapSection</tt> object from a raf input stream.
///
/// </summary>
/// <param name="raf">input stream with BMS content
///
/// </param>
//UPGRADE_TODO: Class 'java.io.RandomAccessFile' was converted to 'System.IO.FileStream' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javaioRandomAccessFile'"
internal Grib1BitMapSection(System.IO.Stream raf)
{
int[] bitmask = new int[] { 128, 64, 32, 16, 8, 4, 2, 1 };
// octet 1-3 (length of section)
length = (int)GribNumbers.uint3(raf);
// octet 4 unused bits
int unused = raf.ReadByte();
// octets 5-6
int bm = GribNumbers.int2(raf);
if (bm != 0)
{
System.Console.Out.WriteLine("BMS pre-defined BM provided by center");
if ((length - 6) == 0)
{
return;
}
sbyte[] data = new sbyte[length - 6];
SupportClass.ReadInput(raf, data, 0, data.Length);
return;
}
sbyte[] data2 = new sbyte[length - 6];
SupportClass.ReadInput(raf, data2, 0, data2.Length);
// create new bit map, octet 4 contains number of unused bits at the end
Bitmap = new bool[(length - 6) * 8 - unused];
// fill bit map
for (int i = 0; i < Bitmap.Length; i++)
{
Bitmap[i] = (data2[i / 8] & bitmask[i % 8]) != 0;
}
} // end Grib1BitMapSection
/// <summary> scans a Grib file to gather information that could be used to
/// create an index or dump the metadata contents.
///
/// </summary>
/// <param name="getProducts">products have enough information for data extractions
/// </param>
/// <param name="oneRecord">returns after processing one record in the Grib file
/// </param>
/// <throws> NotSupportedException </throws>
public void scan(bool getProducts, bool oneRecord)
{
long start = (System.DateTime.Now.Ticks - 621355968000000000) / 10000;
// stores the number of times a particular GDS is used
//UPGRADE_TODO: Class 'java.util.HashMap' was converted to 'System.Collections.Hashtable' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javautilHashMap'"
System.Collections.Hashtable gdsCounter = new System.Collections.Hashtable();
Grib1ProductDefinitionSection pds = null;
Grib1GridDefinitionSection gds = null;
long startOffset = -1;
//System.out.println("file position =" + raf.Position);
while (raf.Position < raf.Length)
{
if (seekHeader(raf, raf.Length, out startOffset))
{
// Read Section 0 Indicator Section
Grib1IndicatorSection is_Renamed = new Grib1IndicatorSection(raf);
//System.out.println( "Grib record length=" + is.getGribLength());
// EOR (EndOfRecord) calculated so skipping data sections is faster
long EOR = raf.Position + is_Renamed.GribLength - is_Renamed.Length;
// Read Section 1 Product Definition Section PDS
pds = new Grib1ProductDefinitionSection(raf);
if (pds.LengthErr)
{
continue;
}
if (pds.gdsExists())
{
// Read Section 2 Grid Definition Section GDS
gds = new Grib1GridDefinitionSection(raf);
}
else
{
// GDS doesn't exist so make one
//System.out.println("GribRecord: No GDS included.");
//System.out.println("Process ID:" + pds.getProcess_Id() );
//System.out.println("Grid ID:" + pds.getGrid_Id() );
gds = (Grib1GridDefinitionSection) new Grib1Grid(pds);
}
// obtain BMS or BDS offset in the file for this product
long dataOffset = 0;
if (pds.Center == 98)
{
// check for ecmwf offset by 1 bug
int length = (int)GribNumbers.uint3(raf); // should be length of BMS
if ((length + raf.Position) < EOR)
{
dataOffset = raf.Position - 3; // ok
}
else
{
dataOffset = raf.Position - 2;
}
}
else
{
dataOffset = raf.Position;
}
// position filePointer to EndOfRecord
raf.Seek(EOR, System.IO.SeekOrigin.Begin);
//System.out.println("file offset = " + raf.Position);
// assume scan ok
if (getProducts)
{
Grib1Product gp = new Grib1Product(header, pds, getGDSkey(gds, gdsCounter), dataOffset, raf.Position);
products.Add(gp);
}
else
{
Grib1Record gr = new Grib1Record(header, is_Renamed, pds, gds, dataOffset, raf.Position, startOffset);
records.Add(gr);
}
if (oneRecord)
{
return;
}
// early return because ending "7777" missing
if (raf.Position > raf.Length)
{
raf.Seek(0, System.IO.SeekOrigin.Begin);
System.Console.Error.WriteLine("Grib1Input: possible file corruption");
checkGDSkeys(gds, gdsCounter);
return;
}
} // end if seekHeader
//System.out.println( "raf.Position=" + raf.Position);
//System.out.println( "raf.Length=" + raf.Length );
} // end while raf.Position < raf.Length
//System.out.println("GribInput: processed in " +
// (System.currentTimeMillis()- start) + " milliseconds");
checkGDSkeys(gds, gdsCounter);
return;
} // end scan
// *** constructors *******************************************************
/// <summary> Constructs a <tt>Grib1ProductDefinitionSection</tt> object from a raf.
///
/// </summary>
/// <param name="raf">with PDS content
///
/// </param>
/// <throws> NotSupportedException if raf contains no valid GRIB file </throws>
//UPGRADE_TODO: Class 'java.io.RandomAccessFile' was converted to 'System.IO.FileStream' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javaioRandomAccessFile'"
public Grib1ProductDefinitionSection(System.IO.FileStream raf)
{
// octets 1-3 PDS length
length = (int)GribNumbers.uint3(raf);
//System.out.println( "PDS length = " + length );
// Paramter table octet 4
table_version = raf.ReadByte();
// Center octet 5
center_id = raf.ReadByte();
// octet 6 Generating Process - See Table A
process_id = raf.ReadByte();
// octet 7 (id of grid type) - not supported yet
grid_id = raf.ReadByte();
//octet 8 (flag for presence of GDS and BMS)
int exists = raf.ReadByte();
//BKSystem.IO.BitStream s = new BKSystem.IO.BitStream(8);
// s.WriteByte((byte)raf.ReadByte());
// s.Position = 0;
// sbyte exists;
// s.Read(out exists);
// bms_exists = (exists & 64) == 64;
gds_exists = (exists & 128) == 128;
bms_exists = (exists & 64) == 64;
// octet 9 (parameter and unit)
parameterNumber = raf.ReadByte();
// octets 10-12 (level)
int levelType = raf.ReadByte();
int levelValue1 = raf.ReadByte();
int levelValue2 = raf.ReadByte();
level = new GribPDSLevel(levelType, levelValue1, levelValue2);
// octets 13-17 (base time for reference time)
int year = raf.ReadByte();
int month = raf.ReadByte();
int day = raf.ReadByte();
int hour = raf.ReadByte();
int minute = raf.ReadByte();
// get info for forecast time
// octet 18 Forecast time unit
timeUnit = raf.ReadByte();
switch (timeUnit)
{
case 0: // minute
tUnit = "minute";
break;
case 1: // hours
tUnit = "hour";
break;
case 2: // day
tUnit = "day";
break;
case 3: // month
tUnit = "month";
break;
case 4: //1 year
tUnit = "1year";
break;
case 5: // decade
tUnit = "decade";
break;
case 6: // normal
tUnit = "day";
break;
case 7: // century
tUnit = "century";
break;
case 10: //3 hours
tUnit = "3hours";
break;
case 11: // 6 hours
tUnit = "6hours";
break;
case 12: // 12 hours
tUnit = "12hours";
break;
case 254: // second
tUnit = "second";
break;
default:
System.Console.Error.WriteLine("PDS: Time Unit " + timeUnit + " is not yet supported");
break;
}
// octet 19 & 20 used to create Forecast time
p1 = raf.ReadByte();
p2 = raf.ReadByte();
// octet 21 (time range indicator)
timeRangeValue = raf.ReadByte();
// forecast time is always at the end of the range
//System.out.println( "PDS timeRangeValue =" + timeRangeValue );
switch (timeRangeValue)
{
case 0:
timeRange = "product valid at RT + P1";
forecastTime = p1;
break;
case 1:
timeRange = "product valid for RT, P1=0";
forecastTime = 0;
break;
case 2:
timeRange = "product valid from (RT + P1) to (RT + P2)";
forecastTime = p2;
break;
case 3:
timeRange = "product is an average between (RT + P1) to (RT + P2)";
forecastTime = p2;
break;
case 4:
timeRange = "product is an accumulation between (RT + P1) to (RT + P2)";
forecastTime = p2;
break;
case 5:
timeRange = "product is the difference (RT + P2) - (RT + P1)";
forecastTime = p2;
break;
case 6:
timeRange = "product is an average from (RT - P1) to (RT - P2)";
forecastTime = -p2;
break;
case 7:
timeRange = "product is an average from (RT - P1) to (RT + P2)";
forecastTime = p2;
break;
case 10:
timeRange = "product valid at RT + P1";
// p1 really consists of 2 bytes p1 and p2
forecastTime = p1 = GribNumbers.int2(p1, p2);
p2 = 0;
break;
case 51:
timeRange = "mean value from RT to (RT + P2)";
forecastTime = p2;
break;
default:
System.Console.Error.WriteLine("PDS: Time Range Indicator " + timeRangeValue + " is not yet supported");
break;
}
// octet 22 & 23
int avgInclude = GribNumbers.int2(raf);
// octet 24
int avgMissing = raf.ReadByte();
// octet 25
int century = raf.ReadByte() - 1;
// octet 26, sub center
subcenter_id = raf.ReadByte();
// octets 27-28 (decimal scale factor)
decscale = GribNumbers.int2(raf);
refTime = new DateTime(century * 100 + year, month, day, hour, minute, 0, DateTimeKind.Utc);
baseTime = refTime;
referenceTime = refTime.ToString(dateFormat);
//System.out.println( "PDS referenceTime raw = " +
//(century * 100 + year) +"-" +
//month + "-" + day + "T" + hour +":" + minute +":00Z" );
//System.out.println( "PDS referenceTime = " + referenceTime );
// TODO
/*
* parameter_table = GribPDSParamTable.getParameterTable(center_id, subcenter_id, table_version);
* parameter = parameter_table.getParameter(parameterNumber);
*/
parameter = new Parameter();
if (center_id == 7 && subcenter_id == 2)
{
// ensemble product
epds = new Grib1Ensemble(raf, parameterNumber);
}
// Special handling of 2D Wave Spectra (single)
else if (table_version == 140 && parameterNumber == 251)
{
SupportClass.Skip(raf, 12);
int extDef = raf.ReadByte(); // Extension definition
// Read ECMWF extension for 2D wave spectra single
if (extDef == 13)
{
waveSpectra2DDirFreq = new Grib1WaveSpectra2DDirFreq(raf);
}
}
else if (length != 28)
{
// check if all bytes read in section
//lengthErr = true;
int extra;
for (int i = 29; i <= length; i++)
{
extra = raf.ReadByte();
}
}
} // end Grib1ProductDefinitionSection
/// <summary> Constructs a Grib1BinaryDataSection object from a raf.
/// A bit map is defined.
///
/// </summary>
/// <param name="raf">raf with BDS content
/// </param>
/// <param name="decimalscale">the exponent of the decimal scale
/// </param>
/// <param name="bms">bit map section of GRIB record
///
/// </param>
/// <throws> NotSupportedException if stream contains no valid GRIB file </throws>
//UPGRADE_TODO: Class 'java.io.RandomAccessFile' was converted to 'System.IO.FileStream' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javaioRandomAccessFile'"
public Grib1BinaryDataSection(System.IO.FileStream raf, int decimalscale, Grib1BitMapSection bms)
{
// octets 1-3 (section length)
length = (int)GribNumbers.uint3(raf);
//System.out.println( "BDS length = " + length );
// octet 4, 1st half (packing flag)
int unusedbits = raf.ReadByte();
// TODO Check this!!!
if ((unusedbits & 192) != 0)
{
throw new NotSupportedException("BDS: (octet 4, 1st half) not grid point data and simple packing ");
}
// octet 4, 2nd half (number of unused bits at end of this section)
unusedbits = unusedbits & 15;
//System.out.println( "BDS unusedbits = " + unusedbits );
// octets 5-6 (binary scale factor)
int binscale = GribNumbers.int2(raf);
// octets 7-10 (reference point = minimum value)
float refvalue = GribNumbers.float4(raf);
// octet 11 (number of bits per value)
int numbits = raf.ReadByte();
//System.out.println( "BDS numbits = " + numbits );
if (numbits == 0)
{
isConstant = true;
}
//System.out.println( "BDS isConstant = " + isConstant );
// *** read values *******************************************************
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
float ref_Renamed = (float)(System.Math.Pow(10.0, -decimalscale) * refvalue);
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
float scale = (float)(System.Math.Pow(10.0, -decimalscale) * System.Math.Pow(2.0, binscale));
if (bms != null)
{
bool[] bitmap = bms.Bitmap;
values = new float[bitmap.Length];
for (int i = 0; i < bitmap.Length; i++)
{
if (bitmap[i])
{
if (!isConstant)
{
values[i] = ref_Renamed + scale * bits2UInt(numbits, raf);
}
else
{
// rdg - added this to handle a constant valued parameter
values[i] = ref_Renamed;
}
}
else
{
values[i] = Grib1BinaryDataSection.UNDEFINED;
}
}
}
else
{
// bms is null
if (!isConstant)
{
//System.out.println( "BDS values.size = " +
//(((length - 11) * 8 - unusedbits) / numbits));
values = new float[((length - 11) * 8 - unusedbits) / numbits];
for (int i = 0; i < values.Length; i++)
{
values[i] = ref_Renamed + scale * bits2UInt(numbits, raf);
}
}
else
{
// constant valued - same min and max
int x = 0, y = 0;
raf.Seek(raf.Position - 53, System.IO.SeekOrigin.Begin); // return to start of GDS
length = (int)GribNumbers.uint3(raf);
if (length == 42)
{
// Lambert/Mercator offset
SupportClass.Skip(raf, 3);
x = GribNumbers.int2(raf);
y = GribNumbers.int2(raf);
}
else
{
SupportClass.Skip(raf, 7);
length = (int)GribNumbers.uint3(raf);
if (length == 32)
{
// Polar sterographic
SupportClass.Skip(raf, 3);
x = GribNumbers.int2(raf);
y = GribNumbers.int2(raf);
}
else
{
x = y = 1;
System.Console.Out.WriteLine("BDS constant value, can't determine array size");
}
}
values = new float[x * y];
for (int i = 0; i < values.Length; i++)
{
values[i] = ref_Renamed;
}
}
}
} // end Grib1BinaryDataSection
/// <summary> Constructs a <tt>Grib1GridDefinitionSection</tt> object from a raf.
///
/// </summary>
/// <param name="raf">RandomAccessFile with GDS content
///
/// </param>
/// <throws> NoValidGribException if raf contains no valid GRIB info </throws>
//UPGRADE_TODO: Class 'java.io.RandomAccessFile' was converted to 'System.IO.FileStream' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javaioRandomAccessFile'"
public Grib1GridDefinitionSection(System.IO.FileStream raf)
{
int reserved; // used to read empty space
// octets 1-3 (Length of GDS)
length = (int)GribNumbers.uint3(raf);
if (length == 0)
{
// there's a extra byte between PDS and GDS
SupportClass.Skip(raf, -2);
length = (int)GribNumbers.uint3(raf);
}
//System.out.println( "GDS length = " + length );
// TODO Fix Checksum stuff
// get byte array for this gds, then reset raf to same position
// calculate checksum for this gds via the byte array
/*
* long mark = raf.Position;
* sbyte[] dst = new sbyte[length - 3];
* SupportClass.ReadInput(raf, dst, 0, dst.Length);
* raf.Seek(mark, System.IO.SeekOrigin.Begin);
* //UPGRADE_ISSUE: Class 'java.util.zip.CRC32' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javautilzipCRC32'"
* //UPGRADE_ISSUE: Constructor 'java.util.zip.CRC32.CRC32' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javautilzipCRC32'"
* CRC32 cs = new CRC32();
* //UPGRADE_ISSUE: Method 'java.util.zip.CRC32.update' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javautilzipCRC32'"
* cs.update(dst);
* //UPGRADE_ISSUE: Method 'java.util.zip.CRC32.getValue' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javautilzipCRC32'"
* checksum = System.Convert.ToString(cs.getValue());
* //System.out.println( "GDS checksum =" + checksum );
*/
// octets 4 NV
int NV = raf.ReadByte();
//System.out.println( "GDS NV = " + NV );
// octet 5 PL the location (octet number) of the list of numbers of points in each row
P_VorL = raf.ReadByte();
//System.out.println( "GDS PL = " + P_VorL );
// octet 6 (grid type)
type = raf.ReadByte();
//System.out.println( "GDS grid type = " + type );
name = getName(type);
if (type != 50)
{
// values same up to resolution
// octets 7-8 (Nx - number of points along x-axis)
nx = GribNumbers.int2(raf);
nx = (nx == -1)?1:nx;
// octets 9-10 (Ny - number of points along y-axis)
ny = GribNumbers.int2(raf);
ny = (ny == -1)?1:ny;
// octets 11-13 (La1 - latitude of first grid point)
lat1 = GribNumbers.int3(raf) / 1000.0;
// octets 14-16 (Lo1 - longitude of first grid point)
lon1 = GribNumbers.int3(raf) / 1000.0;
// octet 17 (resolution and component flags). See Table 7
resolution = raf.ReadByte();
}
switch (type)
{
// Latitude/Longitude grids , Arakawa semi-staggered e-grid rotated
// Arakawa filled e-grid rotated
case 0:
case 4:
case 40:
case 201:
case 202:
// octets 18-20 (La2 - latitude of last grid point)
lat2 = GribNumbers.int3(raf) / 1000.0;
// octets 21-23 (Lo2 - longitude of last grid point)
lon2 = GribNumbers.int3(raf) / 1000.0;
// octets 24-25 (Dx - Longitudinal Direction Increment )
dx = GribNumbers.int2(raf) / 1000.0;
// octets 26-27 (Dy - Latitudinal Direction Increment )
// Np - parallels between a pole and the equator
if (type == 4)
{
np = GribNumbers.int2(raf);
}
else
{
dy = GribNumbers.int2(raf) / 1000.0;
}
// octet 28 (Scanning mode) See Table 8
scan = raf.ReadByte();
// octet 29-32 reserved
reserved = GribNumbers.int4(raf);
if (length > 32)
{
// getP_VorL(raf);
// Vertical coordinates (NV) and thinned grids (PL) not supported - skip this
SupportClass.Skip(raf, length - 32);
}
break; // end Latitude/Longitude grids
case 1: // Mercator grids
// octets 18-20 (La2 - latitude of last grid point)
lat2 = GribNumbers.int3(raf) / 1000.0;
// octets 21-23 (Lo2 - longitude of last grid point)
lon2 = GribNumbers.int3(raf) / 1000.0;
// octets 24-26 (Latin - latitude where cylinder intersects the earth
latin1 = GribNumbers.int3(raf) / 1000.0;
// octet 27 reserved
reserved = raf.ReadByte();
// octet 28 (Scanning mode) See Table 8
scan = raf.ReadByte();
// octets 29-31 (Dx - Longitudinal Direction Increment )
dx = GribNumbers.int3(raf);
// octets 32-34 (Dx - Longitudinal Direction Increment )
dy = GribNumbers.int3(raf);
// octet 35-42 reserved
reserved = GribNumbers.int4(raf);
reserved = GribNumbers.int4(raf);
if (length > 42)
{
// getP_VorL(raf);
// Vertical coordinates (NV) and thinned grids (PL) not supported - skip this
SupportClass.Skip(raf, length - 42);
}
break; // end Mercator grids
case 3: // Lambert Conformal
// octets 18-20 (Lov - Orientation of the grid - east lon parallel to y axis)
lov = GribNumbers.int3(raf) / 1000.0;
// octets 21-23 (Dx - the X-direction grid length) See Note 2 of Table D
dx = GribNumbers.int3(raf);
// octets 24-26 (Dy - the Y-direction grid length) See Note 2 of Table D
dy = GribNumbers.int3(raf);
// octets 27 (Projection Center flag) See Note 5 of Table D
proj_center = raf.ReadByte();
// octet 28 (Scanning mode) See Table 8
scan = raf.ReadByte();
// octets 29-31 (Latin1 - first lat where secant cone cuts spherical earth
latin1 = GribNumbers.int3(raf) / 1000.0;
// octets 32-34 (Latin2 - second lat where secant cone cuts spherical earth)
latin2 = GribNumbers.int3(raf) / 1000.0;
// octets 35-37 (lat of southern pole)
latsp = GribNumbers.int3(raf) / 1000.0;
// octets 38-40 (lon of southern pole)
lonsp = GribNumbers.int3(raf) / 1000.0;
// octets 41-42
reserved = GribNumbers.int2(raf);
if (length > 42)
{
// getP_VorL(raf);
// Vertical coordinates (NV) and thinned grids (PL) not supported - skip this
SupportClass.Skip(raf, length - 42);
}
break; // end Lambert Conformal
case 5: // Polar Stereographic grids
// octets 18-20 (Lov - Orientation of the grid - east lon parallel to y axis)
lov = GribNumbers.int3(raf) / 1000.0;
// octets 21-23 (Dx - Longitudinal Direction Increment )
dx = GribNumbers.int3(raf);
// octets 24-26(Dy - Latitudinal Direction Increment )
dy = GribNumbers.int3(raf);
// octets 27 (Projection Center flag) See Note 5 of Table D
proj_center = raf.ReadByte();
// octet 28 (Scanning mode) See Table 8
scan = raf.ReadByte();
// octet 29-32 reserved
reserved = GribNumbers.int4(raf);
if (length > 32)
{
// getP_VorL(raf);
// Vertical coordinates (NV) and thinned grids (PL) not supported - skip this
SupportClass.Skip(raf, length - 32);
}
break; // end Polar Stereographic grids
//rotated grid
case 10:
//18-20
this.lat2 = GribNumbers.int3(raf) / 1000.0;
//21-23
this.lon2 = GribNumbers.int3(raf) / 1000.0;
//24-25
var tmpDx = GribNumbers.int2(raf);
this.dx = tmpDx == -1 ? -9999.0 : tmpDx / 1000.0;
//26-27
var tmpDy = GribNumbers.int2(raf);
this.dy = tmpDy == -1 ? -9999.0 : tmpDy / 1000.0;
//28
scan = raf.ReadByte();
//29-32
GribNumbers.int4(raf);
//33-35
this.latsp = GribNumbers.int3(raf) / 1000.0;
//36-38
this.lonsp = GribNumbers.int3(raf) / 1000.0;
//39-42 - angle
GribNumbers.float4(raf);
if (length > 42)
{
SupportClass.Skip(raf, length - 42);
}
break;
default:
System.Console.Out.WriteLine("Unknown Grid Type : " + type);
break;
} // end switch grid_type
//System.out.println( "scan=" + scan );
if ((scan & 63) != 0)
{
throw new NoValidGribException("GDS: This scanning mode (" + scan + ") is not supported.");
}
} // end Grib1GridDefinitionSection( raf )