static private void GetMovingWindow(IRasterDigitalElevationModel dem, double[][] window, int x, int y)
{
for (int xi = -1; xi <= 1; xi++)
{
for (int yi = -1; yi <= 1; yi++)
{
window[xi + 1][yi + 1] = dem.GetElevationForDataPoint(x + xi, y + yi);
}
}
}
public virtual void CopyElevationPointsFrom(IRasterDigitalElevationModel dem)
{
if (dem == null)
{
throw new ArgumentNullException("dem");
}
if (LatResolution != dem.LatResolution || LonResolution != dem.LonResolution)
{
throw new ArgumentException("The two DEM's have incompatibile resolutions.");
}
// cell absolute position
int cellLonAbs = dem.LonOffset * dem.LonResolution;
int cellLatAbs = dem.LatOffset * dem.LatResolution;
// first find the place to copy to and extent
// initialize the copying rectangle to the cell's extent
int west, south, east, north;
west = cellLonAbs;
south = cellLatAbs;
east = west + dem.LonResolution - 1;
north = south + dem.LatResolution - 1;
// now intersect it with the destination extent
if (LonOffset > west)
{
west = LonOffset;
}
if (LatOffset > south)
{
south = LatOffset;
}
if (LonOffset + LonLength - 1 < east)
{
east = LonOffset + LonLength - 1;
}
if (LatOffset + LatLength - 1 < north)
{
north = LatOffset + LatLength - 1;
}
for (int xx = west; xx <= east; xx++)
{
for (int yy = south; yy <= north; yy++)
{
double elevation = dem.GetElevationForDataPoint(xx - cellLonAbs, yy - cellLatAbs);
SetElevationForDataPoint(xx - LonOffset, yy - LatOffset, elevation);
}
}
}
public IsohypseCollection Isoplete(IRasterDigitalElevationModel dem, double elevationStep)
{
IsohypseCollection isoColl = new IsohypseCollection();
Isoplete(dem, elevationStep, delegate(Isohypse isohypse)
{
isoColl.AddIsohypse(isohypse);
});
//if (visualizer != null)
//{
// string[] segmentColors = new string[] { "red", "violet", "DarkRed" };
// int segmentCount = 0;
// foreach (Isohypse isohypse in isoColl.Isohypses.Values)
// {
// foreach (Polyline segment in isohypse.Segments)
// {
// segmentCount++;
// for (int i = 0; i < segment.Vertices.Count; i++)
// {
// // if the segment is not closed and we have reached the end, break out
// if (false == segment.IsClosed && i == segment.Vertices.Count - 1)
// break;
// Point3<double> vertexA = segment.Vertices[i];
// Point3<double> vertexB = segment.Vertices[(i + 1) % segment.Vertices.Count];
// visualizer.DrawLine ("brown", vertexA.X, vertexA.Y,
// vertexB.X, vertexB.Y);
// //visualizer.DrawLine (segmentColors[segmentCount % (segmentColors.Length)], vertexA.X, vertexA.Y,
// // vertexB.X, vertexB.Y);
// //visualizer.DrawPoint ("black", vertexA.X, vertexA.Y);
// }
// }
// }
//}
return(isoColl);
}
private Polyline ConstructIsohypseSegment(IRasterDigitalElevationModel dem, IsohypseMovements isohypseMovements)
{
Polyline polyline = new Polyline();
polyline.IsClosed = isohypseMovements.IsClosed;
int x = isohypseMovements.StartingX;
int y = isohypseMovements.StartingY;
bool checkedOrientation = false;
bool shouldBeReversed = false;
foreach (IsohypseMovement movement in isohypseMovements.Movements)
{
int dx1 = 0, dx2 = 0, dy1 = 0, dy2 = 0;
switch (movement)
{
case IsohypseMovement.East:
x++;
dx1 = dx2 = x;
dy1 = y;
dy2 = y + 1;
break;
case IsohypseMovement.North:
dx1 = x;
dx2 = x + 1;
dy1 = dy2 = y;
y--;
break;
case IsohypseMovement.South:
y++;
dx1 = x + 1;
dx2 = x;
dy1 = dy2 = y;
break;
case IsohypseMovement.West:
dx1 = dx2 = x;
dy1 = y + 1;
dy2 = y;
x--;
break;
}
double elevation1 = dem.GetElevationForDataPoint(dx1, dy1);
double elevation2 = dem.GetElevationForDataPoint(dx2, dy2);
// check the orientation of the isohypse
if (false == checkedOrientation)
{
// the right-side elevation should be higher
if (elevation2 < elevation1)
{
shouldBeReversed = true;
}
}
double factor = (isohypseMovements.IsohypseElevation - elevation1) / (elevation2 - elevation1);
double ix, iy;
ix = (factor * (dx2 - dx1) + dx1);
iy = (factor * (dy2 - dy1) + dy1);
GeoPosition geoPos = dem.GetGeoPosition(ix, iy);
Point3 <double> isohypseVertex = new Point3 <double> (geoPos.Longitude, geoPos.Latitude, isohypseMovements.IsohypseElevation);
polyline.AddVertex(isohypseVertex);
}
// now reverse the polyline if needed
if (shouldBeReversed)
{
polyline.Reverse();
}
return(polyline);
}
public void Isoplete(IRasterDigitalElevationModel dem, double elevationStep, NewIsohypseCallback callback)
{
DigitalElevationModelStatistics statistics = dem.CalculateStatistics();
double minElevation = Math.Floor(statistics.MinElevation / elevationStep) * elevationStep;
double maxElevation = Math.Floor(statistics.MaxElevation / elevationStep) * elevationStep;
//if (visualizer != null)
//{
// GeoPosition geoPosMin = dem.GetGeoPosition (0, 0, false);
// GeoPosition geoPosMax = dem.GetGeoPosition (dem.LonLength, dem.LatLength, false);
// visualizer.Initialize (geoPosMin.Longitude, geoPosMin.Latitude,
// geoPosMax.Longitude, geoPosMax.Latitude);
//}
Array2 <byte> flags = new Array2 <byte> (dem.LonLength - 1, dem.LatLength - 1);
Array2 <IsohypseMovement> movements = new Array2 <IsohypseMovement> (dem.LonLength - 1, dem.LatLength - 1);
int[,] adjacentCells = new int[, ] {
{ 0, 0 }, { 1, 0 }, { 1, 1 }, { 0, 1 }
};
// foreach elevation step
for (double isoElev = minElevation; isoElev <= maxElevation; isoElev += elevationStep)
{
activityLogger.Log(ActivityLogLevel.Normal, String.Format(System.Globalization.CultureInfo.InvariantCulture,
"Analyzing elevation {0}", isoElev));
//if (visualizer != null)
//{
// GeoPosition geoPosMin = dem.GetGeoPosition (0, 0, false);
// GeoPosition geoPosMax = dem.GetGeoPosition (dem.LongLength, dem.LatLength, false);
// visualizer.Initialize (geoPosMin.Longitude, geoPosMin.Latitude,
// geoPosMax.Longitude, geoPosMax.Latitude);
// for (int x = 0; x < dem.LongLength; x++)
// {
// for (int y = 0; y < dem.LatLength; y++)
// {
// int elevation = dem.GetElevation (x, y);
// GeoPosition geoPos = dem.GetGeoPosition (x, y);
// string color = elevation >= isoElev ? "orange" : "yellow";
// visualizer.DrawPoint (color, geoPos.Longitude, geoPos.Latitude);
// visualizer.DrawText ("pink", geoPos.Longitude, geoPos.Latitude, elevation.ToString ());
// }
// }
//}
Isohypse isohypse = new Isohypse(isoElev);
flags.Initialize(0);
movements.Initialize(0);
for (int x = 0; x < dem.LonLength - 1; x++)
{
for (int y = 0; y < dem.LatLength - 1; y++)
{
byte cellCharacteristic = 0;
for (int i = 0; i < adjacentCells.GetLength(0); i++)
{
double adjacentCellElev = dem.GetElevationForDataPoint(x + adjacentCells[i, 0], y + adjacentCells[i, 1]);
if (adjacentCellElev >= isoElev)
{
cellCharacteristic++;
flags.SetValue((byte)(flags.GetValue(x, y) | (byte)(1 << i)), x, y);
}
}
// skip cells which are definitively not along the isohypse
if (cellCharacteristic == 0 || cellCharacteristic == 4)
{
continue;
}
if (cellCharacteristic == 2)
{
int maskedFlags = flags.GetValue(x, y) & 0x9;
if (maskedFlags == 0 || maskedFlags == 0x9)
{
movements.SetValue(IsohypseMovement.North | IsohypseMovement.South, x, y);
}
else
{
maskedFlags = flags.GetValue(x, y) & 0x3;
if (maskedFlags == 0 || maskedFlags == 0x3)
{
movements.SetValue(IsohypseMovement.West | IsohypseMovement.East, x, y);
}
else
{
movements.SetValue(
IsohypseMovement.West | IsohypseMovement.East | IsohypseMovement.North | IsohypseMovement.South,
x, y);
}
}
}
else
{
int maskedFlags = flags.GetValue(x, y) & 0x3;
if (maskedFlags != 0 && maskedFlags != 0x3)
{
movements.SetValue(movements.GetValue(x, y) | IsohypseMovement.North, x, y);
}
maskedFlags = flags.GetValue(x, y) & 0x6;
if (maskedFlags != 0 && maskedFlags != 0x6)
{
movements.SetValue(movements.GetValue(x, y) | IsohypseMovement.East, x, y);
}
maskedFlags = flags.GetValue(x, y) & 0xc;
if (maskedFlags != 0 && maskedFlags != 0xc)
{
movements.SetValue(movements.GetValue(x, y) | IsohypseMovement.South, x, y);
}
maskedFlags = flags.GetValue(x, y) & 0x9;
if (maskedFlags != 0 && maskedFlags != 0x9)
{
movements.SetValue(movements.GetValue(x, y) | IsohypseMovement.West, x, y);
}
}
//if (visualizer != null)
//{
// if (cellCharacteristic > 0 && cellCharacteristic < 4)
// {
// GeoPosition geoPos = dem.GetGeoPosition (x + 0.5, y + 0.5);
// if (movements.GetValue (x, y)
// == (IsohypseMovement.West | IsohypseMovement.East | IsohypseMovement.North | IsohypseMovement.South))
// visualizer.DrawText ("blue", geoPos.Longitude, geoPos.Latitude,
// "X");
// //visualizer.DrawText ("blue", geoPos.Longitude, geoPos.Latitude,
// // cellCharacteristic == 2 ? "K" : "T");
// //List<Point2> points = new List<Point2> ();
// //if ((movements[x, y] & IsohypseMovement.North) != 0)
// // points.Add (new Point2 (0.5, 0));
// //if ((movements[x, y] & IsohypseMovement.East) != 0)
// // points.Add (new Point2 (1, 0.5));
// //if ((movements[x, y] & IsohypseMovement.South) != 0)
// // points.Add (new Point2 (0.5, 1));
// //if ((movements[x, y] & IsohypseMovement.West) != 0)
// // points.Add (new Point2 (0, 0.5));
// //List<GeoPosition> geoPoints = new List<GeoPosition> ();
// //foreach (Point2 point in points)
// // geoPoints.Add (dem.GetGeoPosition (x + point.X, y + point.Y));
// //visualizer.DrawLine ("black", geoPoints[0].Longitude, geoPoints[0].Latitude,
// // geoPoints[1].Longitude, geoPoints[1].Latitude);
// //if (geoPoints.Count > 2)
// // visualizer.DrawLine ("black", geoPoints[2].Longitude, geoPoints[2].Latitude,
// // geoPoints[3].Longitude, geoPoints[3].Latitude);
// }
//}
}
}
for (int x = 0; x < dem.LonLength - 1; x++)
{
for (int y = 0; y < dem.LatLength - 1; y++)
{
if (movements.GetValue(x, y) != IsohypseMovement.None)
{
IsohypseMovements isohypseMovements = ExtractIsohypseMovements(dem, isoElev, movements, flags, x, y);
Polyline isohypseSegment = ConstructIsohypseSegment(dem, isohypseMovements);
isohypseSegment.RemoveDuplicateVertices();
isohypse.AddSegment(isohypseSegment);
activityLogger.Log(ActivityLogLevel.Verbose, String.Format(System.Globalization.CultureInfo.InvariantCulture,
"Found segment with {0} vertices", isohypseSegment.VerticesCount));
}
}
}
if (isohypse.Segments.Count > 0)
{
callback(isohypse);
}
//isoColl.AddIsohypse (isohypse);
}
}
private IsohypseMovements ExtractIsohypseMovements(
IRasterDigitalElevationModel dem,
double isohypseElevation,
Array2 <IsohypseMovement> movements,
Array2 <byte> flags,
int startingX,
int startingY)
{
IsohypseMovements isohypseMovements = new IsohypseMovements(isohypseElevation);
isohypseMovements.StartingX = startingX;
isohypseMovements.StartingY = startingY;
int x = isohypseMovements.StartingX;
int y = isohypseMovements.StartingY;
int lastX = 0, lastY = 0;
IsohypseMovement lastMovement = IsohypseMovement.None;
bool foundOneEnd = false;
while (true)
{
// if we reached the end of the grid
if (x < 0 || y < 0 || x >= dem.LonLength - 1 || y >= dem.LatLength - 1)
{
// have we already found one end of the segment?
if (false == foundOneEnd)
{
// we haven't...
foundOneEnd = true;
// ... so reverse the segment and start moving from the other end
int oldStartingX = isohypseMovements.StartingX;
int oldStartingY = isohypseMovements.StartingY;
isohypseMovements.ReverseIsohypseMovements(x, y);
x = oldStartingX;
y = oldStartingY;
}
else
{
// we have, so we can exit
break;
}
}
if (x == isohypseMovements.StartingX &&
y == isohypseMovements.StartingY &&
isohypseMovements.Movements.Count > 0)
{
// we found the starting point, this is a closed polygon
isohypseMovements.IsClosed = true;
break;
}
IsohypseMovement currentCellMovement = movements.GetValue(x, y);
bool movementFound = false;
for (int i = 0; i < 4; i++)
{
IsohypseMovement movementConsidered = (IsohypseMovement)(1 << i);
if (0 != (currentCellMovement & movementConsidered))
{
int nextX = x, nextY = y;
switch (movementConsidered)
{
case IsohypseMovement.East:
nextX++;
break;
case IsohypseMovement.North:
nextY--;
break;
case IsohypseMovement.South:
nextY++;
break;
case IsohypseMovement.West:
nextX--;
break;
default:
throw new NotImplementedException();
}
// find the opposite movement of the last movement
IsohypseMovement oppositeMovement = IsohypseMovements.GetOppositeMovement(lastMovement);
if (lastMovement != IsohypseMovement.None)
{
// check that we haven't moved back
if (nextX == lastX && nextY == lastY)
{
continue;
}
// special case when all movements are possible
if ((((int)currentCellMovement) & 0xf) == 0xf)
{
IsohypseMovement movementCombination = movementConsidered | oppositeMovement;
// check that we haven't moved in such a way as to make the polygon cross itself
if ((movementCombination & (IsohypseMovement.North | IsohypseMovement.South))
== (IsohypseMovement.North | IsohypseMovement.South))
{
continue;
}
// check that we haven't moved in such a way as to make the polygon cross itself
if ((movementCombination & (IsohypseMovement.West | IsohypseMovement.East))
== (IsohypseMovement.West | IsohypseMovement.East))
{
continue;
}
// check that the movement is the right one in regards to cells elevations
if (flags.GetValue(x, y) == 5)
{
if (movementCombination == (IsohypseMovement.South | IsohypseMovement.East) ||
movementCombination == (IsohypseMovement.North | IsohypseMovement.West))
{
continue;
}
}
else if (flags.GetValue(x, y) == 10)
{
if (movementCombination == (IsohypseMovement.South | IsohypseMovement.West) ||
movementCombination == (IsohypseMovement.North | IsohypseMovement.East))
{
continue;
}
}
else
{
throw new NotImplementedException();
}
}
}
isohypseMovements.Movements.Add(movementConsidered);
// remove the used movement from the array
movements.SetValue(movements.GetValue(x, y) & ~movementConsidered, x, y);
// remove this opposite movement from the array
movements.SetValue(movements.GetValue(x, y) & ~oppositeMovement, x, y);
lastX = x;
lastY = y;
lastMovement = movementConsidered;
x = nextX;
y = nextY;
movementFound = true;
break;
}
}
if (movementFound == false)
{
throw new NotImplementedException();
}
}
return(isohypseMovements);
}
static public Image GenerateShadedReliefImage(
IRasterDigitalElevationModel dem,
IShadingMethod shadingMethod,
ShadingParameters shadingParameters)
{
Bitmap bitmap = new Bitmap(dem.LonLength, dem.LatLength);
double[][] window = new double[3][] { new double[3], new double[3], new double[3] };
double earthRadius = 6360000;
double earthCircumference = earthRadius * 2 * Math.PI;
double latSpacing = earthCircumference / (360 * dem.LatResolution);
shadingMethod.Initialize(shadingParameters);
for (int y = 1; y < dem.LatLength - 1; y++)
{
GeoPosition geoPos = dem.GetGeoPosition(0, y);
double lonSpacing = earthCircumference / (360 * dem.LonResolution) * Math.Cos(geoPos.Latitude * Math.PI / 180.0);
for (int x = 1; x < dem.LonLength - 1; x++)
{
GetMovingWindow(dem, window, x, y);
double dzdx = ((window[0][0] + 2 * window[0][1] + window[0][2])
- (window[2][0] + 2 * window[2][1] + window[2][2]))
/ (8 * lonSpacing);
if (double.IsNaN(dzdx))
{
continue;
}
double dzdy = ((window[0][0] + 2 * window[1][0] + window[2][0])
- (window[0][2] + 2 * window[1][2] + window[2][2]))
/ (8 * latSpacing);
if (double.IsNaN(dzdy))
{
continue;
}
double riseRun = Math.Sqrt(dzdx * dzdx + dzdy * dzdy);
double slope = Math.PI / 2 - Math.Atan(riseRun);
double aspect = Math.Atan2(dzdy, dzdx);
//double aspect = Math.Atan2 (window[1][0] - window[1][2],
// window[0][1] - window[2][1]);
if (dzdx != 0 || dzdy != 0)
{
if (aspect == 0)
{
aspect = Math.PI * 2;
}
}
else
{
aspect = 0;
}
Color color = shadingMethod.CalculateColor(aspect, slope);
bitmap.SetPixel(x, bitmap.Height - y, color);
}
}
return(bitmap);
}
static public IList <PointOfInterest> FindPeaks(IRasterDigitalElevationModel dem, int howMany)
{
IList <PointOfInterest> peaks = new List <PointOfInterest> ();
Point2 <int>[] neighbourPoints = { new Point2 <int> (-1, 0), new Point2 <int> (1, 0), new Point2 <int> (0, -1),
new Point2 <int> (0, 1) };
for (int x = 1; x < dem.LonLength - 1; x++)
{
for (int y = 1; y < dem.LatLength - 1; y++)
{
double elevation = dem.GetElevationForDataPoint(x, y);
// first check if it is a peak
bool isPeak = true;
for (int i = 0; i < neighbourPoints.Length; i++)
{
if (elevation <= dem.GetElevationForDataPoint((int)(x + neighbourPoints[i].X), (int)(y + neighbourPoints[i].Y)))
{
isPeak = false;
break;
}
}
if (isPeak)
{
for (int i = 0; i < peaks.Count + 1; i++)
{
bool addPeak = false;
if (i == peaks.Count)
{
addPeak = true;
}
else
{
PointOfInterest peak = peaks[i] as PointOfInterest;
if (elevation > peak.Position.Elevation)
{
addPeak = true;
}
}
if (addPeak)
{
PointOfInterest newPeak = new PointOfInterest(dem.GetGeoPosition(x, y),
String.Format(System.Globalization.CultureInfo.InvariantCulture, "Peak {0}", elevation));
peaks.Insert(i, newPeak);
if (peaks.Count > howMany)
{
peaks.RemoveAt(peaks.Count - 1);
}
break;
}
}
}
}
}
return(peaks);
}
static private double CalculateNeighbours(IRasterDigitalElevationModel dem, MissingElevation me)
{
double interpolatedElevation = 0;
me.MissingNeighbours = 0;
if (me.Lng > 0)
{
double elevation = dem.GetElevationForDataPoint(me.Lng - 1, me.Lat);
if (elevation == Int16.MinValue)
{
me.MissingNeighbours++;
}
else
{
interpolatedElevation += elevation;
}
}
else
{
me.MissingNeighbours++;
}
if (me.Lng < dem.LonLength - 1)
{
double elevation = dem.GetElevationForDataPoint(me.Lng + 1, me.Lat);
if (elevation == Int16.MinValue)
{
me.MissingNeighbours++;
}
else
{
interpolatedElevation += elevation;
}
}
else
{
me.MissingNeighbours++;
}
if (me.Lat > 0)
{
double elevation = dem.GetElevationForDataPoint(me.Lng, me.Lat - 1);
if (elevation == Int16.MinValue)
{
me.MissingNeighbours++;
}
else
{
interpolatedElevation += elevation;
}
}
else
{
me.MissingNeighbours++;
}
if (me.Lat < dem.LatLength - 1)
{
double elevation = dem.GetElevationForDataPoint(me.Lng, me.Lat + 1);
if (elevation == Int16.MinValue)
{
me.MissingNeighbours++;
}
else
{
interpolatedElevation += elevation;
}
}
else
{
me.MissingNeighbours++;
}
if (me.MissingNeighbours < 4)
{
interpolatedElevation /= (4 - me.MissingNeighbours);
}
else
{
interpolatedElevation = 0;
}
return(interpolatedElevation);
}
public IRasterDigitalElevationModel Process(IRasterDigitalElevationModel input)
{
// clone data
IRasterDigitalElevationModel output = input.Clone() as IRasterDigitalElevationModel;
SortedList <MissingElevation, Point2 <double> > missingElevations = new SortedList <MissingElevation, Point2 <double> > ();
// find all missing elevations
for (int x = 0; x < output.LonLength; x++)
{
for (int y = 0; y < output.LatLength; y++)
{
double elevation = output.GetElevationForDataPoint(x, y);
if (elevation == double.MinValue)
{
MissingElevation me = new MissingElevation();
me.Lng = x;
me.Lat = y;
// now calculate missing neighbours count
CalculateNeighbours(output, me);
// now add it to the list
missingElevations.Add(me, new Point2 <double> (me.Lng, me.Lat));
}
}
}
int startingMissingElevations = missingElevations.Count;
// while there are missing elevations
while (missingElevations.Count > 0)
{
// use first missing elevation
MissingElevation me = missingElevations.Keys[0];
// based on the neighbouring non-missing data, calculate interpolated elevation
double interpolatedElevation = CalculateNeighbours(output, me);
// enter this elevation into the output ElevationData
output.SetElevationForDataPoint(me.Lng, me.Lat, interpolatedElevation);
// remove this elevation from missing elevation list
missingElevations.Remove(me);
// for each neighbour which is also missing elevation:
// decrease the missingNeighbours counter
// and reposition the neighbour in the missing elevations list
Point2 <double>[] neighbourPoints = { new Point2 <double> (me.Lng - 1, me.Lat),
new Point2 <double> (me.Lng + 1, me.Lat),new Point2 <double> (me.Lng, me.Lat - 1),
new Point2 <double> (me.Lng, me.Lat + 1) };
for (int i = 0; i < 4; i++)
{
Point2 <double> p = neighbourPoints[i];
if (missingElevations.ContainsValue(p))
{
MissingElevation me2 = missingElevations.Keys[missingElevations.IndexOfValue(p)];
missingElevations.Remove(me2);
me2.MissingNeighbours--;
missingElevations.Add(me2, p);
}
}
}
return(output);
}
public void Execute()
{
ConsoleActivityLogger activityLogger = new ConsoleActivityLogger();
activityLogger.LogLevel = ActivityLogLevel.Verbose;
// Use all available encryption protocols supported in the .NET Framework 4.0.
// TLS versions > 1.0 are supported and available via the extensions.
// see https://blogs.perficient.com/microsoft/2016/04/tsl-1-2-and-net-support/
// This is a global setting for all HTTP requests.
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolTypeExtensions.Tls11 | SecurityProtocolTypeExtensions.Tls12 | SecurityProtocolType.Ssl3;
// first make sure that the SRTM directory exists
if (!Directory.Exists(srtmDir))
{
Directory.CreateDirectory(srtmDir);
}
string srtmIndexFilename = Path.Combine(srtmDir, "SrtmIndex.dat");
SrtmIndex srtmIndex = null;
SrtmIndex.SrtmSource = srtmSource;
try
{
srtmIndex = SrtmIndex.Load(srtmIndexFilename);
}
catch (Exception)
{
// in case of exception, regenerate the index
generateIndex = true;
}
if (generateIndex)
{
srtmIndex = new SrtmIndex();
srtmIndex.ActivityLogger = activityLogger;
srtmIndex.Generate();
srtmIndex.Save(srtmIndexFilename);
srtmIndex = SrtmIndex.Load(srtmIndexFilename);
}
Srtm3Storage.SrtmSource = srtmSource;
Srtm3Storage storage = new Srtm3Storage(Path.Combine(srtmDir, "SrtmCache"), srtmIndex);
storage.ActivityLogger = activityLogger;
IIsopletingAlgorithm alg = new Igor4IsopletingAlgorithm();
alg.ActivityLogger = activityLogger;
double elevationStepInUnits = elevationStep * elevationUnits;
contourMarker.Configure(elevationUnits);
// Default: Start with highest possible ID and count down. That should give maximum space
// between contour data and real OSM data.
IdCounter nodeCounter = new IdCounter(incrementId, firstNodeId);
IdCounter wayCounter = new IdCounter(incrementId, firstWayId);
OutputSettings settings = new OutputSettings();
settings.ContourMarker = contourMarker;
settings.LongitudeCorrection = corrX;
settings.LatitudeCorrection = corrY;
settings.MaxWayNodes = maxWayNodes;
// The following IDs and name do exist in the OSM database.
settings.UserName = "******";
settings.UserId = 941874;
settings.ChangesetId = 13341398;
OutputBase output = null;
if (largeAreaMode)
{
output = new DirectOutput(new FileInfo(outputOsmFile), settings);
}
else
{
output = new DatabaseOutput(new FileInfo(outputOsmFile), settings);
}
output.Begin();
if (osmMergeFile != null)
{
activityLogger.LogFormat(ActivityLogLevel.Normal, "Importing dataset from {0}", osmMergeFile);
output.Merge(osmMergeFile);
}
if (this.splitWidth != 0 && this.splitHeight != 0)
{
List <Bounds2> newBounds = new List <Bounds2> ();
foreach (Bounds2 bound in this.bounds)
{
newBounds.AddRange(BoundsSplitter.Split(bound, this.splitWidth, this.splitHeight));
}
this.bounds = newBounds;
activityLogger.LogFormat(ActivityLogLevel.Normal, "Will process {0} seperate bounds.", bounds.Count);
}
foreach (Bounds2 bound in this.bounds)
{
Bounds2 corrBounds = new Bounds2(bound.MinX - corrX, bound.MinY - corrY,
bound.MaxX - corrX, bound.MaxY - corrY);
activityLogger.LogFormat(ActivityLogLevel.Normal, "Calculating contour data for bound {0}...", corrBounds);
IRasterDigitalElevationModel dem = (IRasterDigitalElevationModel)storage.LoadDemForArea(corrBounds);
// clear up some memory used in storage object
if (this.bounds.Count == 1)
{
storage = null;
GC.Collect();
}
DigitalElevationModelStatistics statistics = dem.CalculateStatistics();
activityLogger.Log(ActivityLogLevel.Normal, String.Format(CultureInfo.InvariantCulture,
"DEM data points count: {0}", dem.DataPointsCount));
activityLogger.Log(ActivityLogLevel.Normal, String.Format(CultureInfo.InvariantCulture,
"DEM minimum elevation: {0}", statistics.MinElevation));
activityLogger.Log(ActivityLogLevel.Normal, String.Format(CultureInfo.InvariantCulture,
"DEM maximum elevation: {0}", statistics.MaxElevation));
activityLogger.Log(ActivityLogLevel.Normal, String.Format(CultureInfo.InvariantCulture,
"DEM has missing points: {0}", statistics.HasMissingPoints));
try
{
alg.Isoplete(dem, elevationStepInUnits, delegate(Isohypse isohypse)
{
output.ProcessIsohypse(isohypse, delegate() { return(GetNextId(nodeCounter, true)); },
delegate() { return(GetNextId(wayCounter, false)); });
});
}
catch (OutOfMemoryException)
{
string msg = "Not enough memory. ";
if (this.splitWidth == 0 && this.splitHeight == 0)
{
msg += "Try to decrease the bounding box or use the splitbounds parameter.";
}
else
{
msg += "Try to decrease the splitbounds value.";
}
activityLogger.Log(ActivityLogLevel.Error, msg);
break;
}
}
if (!largeAreaMode)
{
activityLogger.Log(ActivityLogLevel.Normal, "Saving contour data to file...");
}
output.End();
activityLogger.Log(ActivityLogLevel.Normal, "Done.");
// TODO: SVG file generator code
// using (FileStream stream = File.Open ("test.svg", FileMode.Create, FileAccess.Write))
// {
// using (StreamWriter writer = new StreamWriter (stream))
// {
// int width = 1000;
// int height = 800;
// double aspectRatio = (maxLat - minLat) / height;
// aspectRatio = Math.Max (aspectRatio, (maxLng - minLng) / width);
// writer.WriteLine (String.Format (System.Globalization.CultureInfo.InvariantCulture,
// @"<?xml version='1.0' encoding='utf-8' standalone='yes'?>
//<!DOCTYPE svg[]>
//<svg viewBox='{0} {1} {2} {3}' width='{2}' height='{3}' id='0'>", 0, 0, width, height));
// foreach (Isohypse isohypse in isoCollection.Isohypses.Values)
// {
// foreach (Polyline polyline in isohypse.Segments)
// {
// StringBuilder pathString = new StringBuilder ();
// for (int i = 0; i < polyline.VerticesCount; i++)
// {
// Point3 point = polyline.Vertices[i];
// if (i == 0)
// {
// pathString.AppendFormat ("M ");
// }
// else if (i == 1)
// {
// pathString.AppendFormat ("C ");
// }
// pathString.AppendFormat (System.Globalization.CultureInfo.InvariantCulture, "{0},{1} ",
// (point.X - minLng) / aspectRatio, (maxLat - point.Y) / aspectRatio);
// if (i > 0)
// pathString.AppendFormat (System.Globalization.CultureInfo.InvariantCulture, "{0},{1} ",
// (point.X - minLng) / aspectRatio, (maxLat - point.Y) / aspectRatio);
// }
// writer.WriteLine (@"<path d='{0}' fill='none' stroke='black' stroke-width='0.25px'/>", pathString.ToString ());
// }
// }
// writer.WriteLine (@"</svg>");
// }
// }
}
