public static double RawToFinalFormat(this UInt16 rawData, PgmDataDescription pgmParameters)
{
if (rawData > pgmParameters.MaxValue)
{
throw new ArgumentOutOfRangeException("rawData");
}
return rawData * pgmParameters.Scale + pgmParameters.Offset;
}
private static UInt16[] readScaledUndulationFromStream(Stream stream, PgmDataDescription dataDescription)
{
var dataLength = dataDescription.NumberOfPoints;
var data = new UInt16[dataLength];
using (var binReader = new EndianBinaryReader(EndianBitConverter.Big, stream))
{
for (int i = 0; i < dataLength; i++)
{
data[i] = binReader.ReadUInt16();
}
}
return data;
}
public static int CoordinatesToClosestGridPosition(double latitude, double longitude, PgmDataDescription dataDescription)
{
if (dataDescription.OriginLat != 90 || dataDescription.OriginLon != 0)
{
throw new ArgumentOutOfRangeException("dataDescription",
String.Format("Coordinates of the origin are {0} {1}, but should be 90 0.",
dataDescription.OriginLat,
dataDescription.OriginLon));
}
var gridAbsoluteLat = (dataDescription.OriginLat - latitude) * dataDescription.LatitudeIncrementDegrees;
int closestAccessibleGridLat = (int)Math.Round(gridAbsoluteLat);
var gridAbsoluteLon = (longitude - dataDescription.OriginLon) * dataDescription.LongitudeIncrementDegrees;
int closestAccessibleGridLon = (int)Math.Round(gridAbsoluteLon);
int closestAccessiblePosition = (closestAccessibleGridLon + closestAccessibleGridLat * dataDescription.GridGraphWidthPoints);
if (closestAccessiblePosition < 0 || closestAccessiblePosition > dataDescription.NumberOfPoints)
throw new InvalidOperationException(String.Format("Position is out of range. Probably latitude {0} or longitude {1} are out of range.",
latitude,
longitude));
return closestAccessiblePosition;
}
internal void PgmGeographicLibPreamblesAreProperlyConvertToDataDescriptions(string preamble, PgmDataDescription expectedDescription)
{
var actualDescription = PgmDataDescriptionExtractor.getConstatantsFromPreamble(preamble);
AssertDeep.Equal(actualDescription, expectedDescription);
}
public void CorrectPreambleWithChangedOffsetAndScaleFormatExtractCorrectly()
{
var expectedDescription = new PgmDataDescription(108, 5, 90, 0, 4320, 2161, 65535, 416, Level.GeoidEgm2008);
var actualDescription = PgmDataDescriptionExtractor.getConstatantsFromPreamble(PgmAcceptablePreambles.WithChangedOffsetAndScaleFormat);
AssertDeep.Equal(actualDescription, expectedDescription);
}
