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- modified landcover code to borrow a cover type from an adjoining

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tile if it ends up as default -- this will help avoid resolution
  errors near rivers, urban areas, etc.
This commit is contained in:
curt 2001-07-30 19:58:10 +00:00
parent f9a8370433
commit 8506a3f4d5
1 changed files with 34 additions and 5 deletions
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39
src/BuildTiles/Main/main.cxx
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@ -227,17 +227,46 @@ static void inline add_to_polys ( FGPolygon &accum, const FGPolygon &poly) {
}
static AreaType get_area_type (const LandCover &cover,
double xpos, double ypos,
double dx, double dy)
{
// Look up the land cover for the square
int cover_value = cover.getValue(xpos, ypos);
AreaType area = translateUSGSCover(cover_value);
// Non-default area is fine.
if (area != DefaultArea) {
return area;
}
// If we're stuck with the default area,
// try to borrow from a neighbour.
else {
for (double x = xpos - dx; x <= xpos + dx; x += dx) {
for (double y = ypos - dy; y < ypos + dx; y += dy) {
if (x != xpos || y != ypos) {
cover_value = cover.getValue(x, y);
area = translateUSGSCover(cover_value);
if (area != DefaultArea)
return area;
}
}
}
}
// OK, give up and return default
return DefaultArea;
}
// make the area specified area, look up the land cover type, and add
// it to polys
static void make_area( const LandCover &cover, FGPolygon *polys,
double x1, double y1, double x2, double y2,
double half_dx, double half_dy )
{
// Look up the land cover for the square
int cover_value = cover.getValue( x1 + half_dx, y1 + half_dy );
cout << " position: " << x1 << ',' << y1 << ','
<< cover.getDescUSGS(cover_value) << endl;
AreaType area = translateUSGSCover(cover_value);
AreaType area = get_area_type(cover, x1 + half_dx, y1 + half_dy,
x2 - x1, y2 - y1);
if (area != DefaultArea) {
// Create a square polygon and merge it into the list.
FGPolygon poly;