/// <summary>
/// Get the cell slope in radians based on its circular neighborhood. The results is the angle between vertical axis and normal of the cell.
/// E.g. 0 = cell is completely flat, pi/2 = the cell is a vertical wall.
/// </summary>
/// <param name="cellY">Y coordinate of the cell</param>
/// <param name="cellX">X coordinate of the cell</param>
/// <returns>Cell slope in radians</returns>
private double GetCellSlope(int cellY, int cellX)
{
double cn = Math.Sqrt(2);
double northsouth;
double eastwest;
if (cellX <= 0 || cellY <= 0 || cellX >= ElevationMap.GetLength(1) - 1 || cellY >= ElevationMap.GetLength(0) - 1)
{
return(0);
}
try {
northsouth = (cn * ElevationMap[cellY - 1, cellX - 1] + ElevationMap[cellY - 1, cellX] + cn * ElevationMap[cellY - 1, cellX + 1]) / 4
- (cn * ElevationMap[cellY + 1, cellX - 1] + ElevationMap[cellY + 1, cellX] + cn * ElevationMap[cellY + 1, cellX + 1]) / 4;
eastwest = (cn * ElevationMap[cellY - 1, cellX - 1] + ElevationMap[cellY, cellX - 1] + cn * ElevationMap[cellY + 1, cellX - 1]) / 4
- (cn * ElevationMap[cellY - 1, cellX + 1] + ElevationMap[cellY, cellX + 1] + cn * ElevationMap[cellY + 1, cellX + 1]) / 4;
} catch (IndexOutOfRangeException) {
System.Diagnostics.Debug.WriteLine("{0}, {1}", cellX, cellY);
return(0);
}
Vector3 northVector = Vector3.Normalize(new Vector3(0, 2 * (float)cellResolution, (float)northsouth));
Vector3 eastVector = Vector3.Normalize(new Vector3(2 * (float)cellResolution, 0, (float)eastwest));
Vector3 slopeVector = Vector3.Cross(eastVector, northVector);
return(GetVectorAngle(slopeVector, verticalVector));
}
public ElevationTileCollection(ElevationMap elevationMap)
{
foreach (var item in elevationMap.Tiles)
{
_elevationTiles.Add(new ElevationTile(new GpsLocation(item.Longitude, item.Latitude, 0)));
}
}
/// <summary>
/// Calculate West-East and North-South components of the cell slope.
/// </summary>
/// <param name="cellY">Y coordinate of the cell</param>
/// <param name="cellX">X coordinate of the cell</param>
/// <param name="westeast">output West-East component</param>
/// <param name="southnorth">output North-South component</param>
private void GetCellSlopeComponents(int cellY, int cellX, out double eastwest, out double northsouth)
{
double cn = Math.Sqrt(2);
if (cellX <= 0 || cellY <= 0 || cellX >= ElevationMap.GetLength(1) - 1 || cellY >= ElevationMap.GetLength(0) - 1)
{
northsouth = eastwest = 0;
return;
}
try {
northsouth = (cn * ElevationMap[cellY - 1, cellX - 1] + ElevationMap[cellY - 1, cellX] + cn * ElevationMap[cellY - 1, cellX + 1]) / 4
- (cn * ElevationMap[cellY + 1, cellX - 1] + ElevationMap[cellY + 1, cellX] + cn * ElevationMap[cellY + 1, cellX + 1]) / 4;
eastwest = (cn * ElevationMap[cellY - 1, cellX - 1] + ElevationMap[cellY, cellX - 1] + cn * ElevationMap[cellY + 1, cellX - 1]) / 4
- (cn * ElevationMap[cellY - 1, cellX + 1] + ElevationMap[cellY, cellX + 1] + cn * ElevationMap[cellY + 1, cellX + 1]) / 4;
} catch (IndexOutOfRangeException) {
System.Diagnostics.Debug.WriteLine("{0}, {1}", cellX, cellY);
northsouth = eastwest = 0;
}
}
public MapGraph(Voronoi voronoi, ElevationMap elevationMap)
{
this.elevationMap = elevationMap;
generateGraph(voronoi);
}
private void button1_Click(object sender, EventArgs e)
{
//initialize list
InitializeList();
double maxHeight = 0;
double minHeight = 0;
using (Tiff tiff = Tiff.Open(@"C:\Users\javier.santos\Downloads\eudem_dem_5deg_n25w020.tif", "r"))
{
int height = tiff.GetField(TiffTag.IMAGELENGTH)[0].ToInt();
FieldValue[] modelPixelScaleTag = tiff.GetField((TiffTag)33550);
FieldValue[] modelTiepointTag = tiff.GetField((TiffTag)33922);
FieldValue[] GDALMetadataTag = tiff.GetField((TiffTag)42112);
byte[] GDALMetadata = GDALMetadataTag[1].GetBytes();
XmlDocument doc = new XmlDocument();
string xml = Encoding.UTF8.GetString(GDALMetadata);
xml = xml.Replace("\0", string.Empty);
doc.LoadXml(xml);
XmlNode initialXMLNode = doc.GetElementsByTagName("GDALMetadata")[0];
foreach (XmlNode node in initialXMLNode.ChildNodes)
{
string name = node.Attributes.GetNamedItem("name").Value;
switch (name)
{
case "STATISTICS_MAXIMUM":
maxHeight = Double.Parse(node.InnerText);
break;
case "STATISTICS_MINIMUM":
minHeight = Double.Parse(node.InnerText);
break;
}
}
byte[] modelPixelScale = modelPixelScaleTag[1].GetBytes();
double pixelSizeX = BitConverter.ToDouble(modelPixelScale, 0);
double pixelSizeY = BitConverter.ToDouble(modelPixelScale, 8) * -1;
byte[] modelTransformation = modelTiepointTag[1].GetBytes();
double originLon = BitConverter.ToDouble(modelTransformation, 24);
double originLat = BitConverter.ToDouble(modelTransformation, 32);
double startLat = originLat + (pixelSizeY / 2.0);
double startLon = originLon + (pixelSizeX / 2.0);
var scanline = new byte[tiff.ScanlineSize()];
Single[] scanline32Bit = new Single[tiff.ScanlineSize() / 2];
double currentLat = startLat;
double currentLon = startLon;
//Write into the file
//using (StreamWriter writer = new StreamWriter("output.txt"))
//{
ElevationMap elevationMap = new ElevationMap();
//for (int i = 0; i < height; i++)
for (int i = 0; i < height; i++)
{
//MapRow row = new MapRow();
tiff.ReadScanline(scanline, i);
Buffer.BlockCopy(scanline, 0, scanline32Bit, 0, scanline.Length);
var latitude = currentLat + (pixelSizeY * i);
for (int j = 0; j < scanline32Bit.Length; j++)
{
var longitude = currentLon + (pixelSizeX * j);
Single value = scanline32Bit[j];
if (value == 2143289344)
{
value = -9999;
}
//Check results
CheckMinMaxResult(new PointXYZ(latitude, longitude, value));
//row.Add(new PointXYZ(latitude, longitude, value));
//writer.Write(value + " ");
}
//elevationMap.Add(row);
//writer.WriteLine();
}
//}
}
//Write into the file
using (StreamWriter writer = new StreamWriter("outputResults.txt"))
{
writer.WriteLine("MAX REAL HEIGHT = " + maxHeight);
writer.WriteLine("MIN REAL HEIGHT = " + minHeight);
writer.WriteLine();
//Max Values
for (int i = 0; i < MinMaxResultsSalmples; i++)
{
writer.WriteLine("MAXIMUM " + i);
writer.WriteLine(listMaxResult[i].X + ", " + listMaxResult[i].Y + ", " + listMaxResult[i].Z);
}
//Min values
for (int i = 0; i < MinMaxResultsSalmples; i++)
{
writer.WriteLine("MINIMUN " + i);
writer.WriteLine(listMinResult[i].X + ", " + listMinResult[i].Y + ", " + listMinResult[i].Z);
}
}
System.Windows.Forms.MessageBox.Show("Done");
}
