//分块清理，提高效率
public static OSGeo.OGR.Layer cleanLayer_Cut(OSGeo.OGR.Layer pdLayer, double minArea, double maxArea, double maxCha = 1)
{
List <CutBox> Tree = buildTree(pdLayer);
shpDataSet.deleteLayerByName("pdClear");
OSGeo.OGR.Layer outLayer = shpDataSet.CreateLayer("pdClear", pdLayer.GetSpatialRef(), pdLayer.GetGeomType(), null);
OSGeo.OGR.Envelope oriEnve = new OSGeo.OGR.Envelope();
OSGeo.OGR.Envelope nextEnve = new OSGeo.OGR.Envelope();
StaticTools.msgLine("clean SlopeLine...");
for (int c = 0; c < Tree.Count; c++)
{
CutBox cb = Tree[c];
int featCount = cb.pdxIDs.Count;
for (int i = 0; i < featCount - 1; i++)
{
bool isOnly = true;
OSGeo.OGR.Feature ori = pdLayer.GetFeature(cb.pdxIDs[i]);
double oriArea = ori.GetGeometryRef().GetArea();
if (oriArea < minArea || oriArea > maxArea)
{
//判断当前要素的面积，过小或过大时，认为其有相同的图形，不加入新的Layer
isOnly = false;
}
else
{
//判断当前要素与其它要素的包围盒的对应边，差值都小于阈值时，认为是相同的图形，需要跳过
//没有相同的图型时，isOnly为true ，塞到新的layer里
ori.GetGeometryRef().GetEnvelope(oriEnve);
for (int j = i + 1; j < featCount; j++)
{
pdLayer.GetFeature(cb.pdxIDs[j]).GetGeometryRef().GetEnvelope(nextEnve);
if (Math.Abs(oriEnve.MaxX - nextEnve.MaxX) < maxCha &&
Math.Abs(oriEnve.MaxY - nextEnve.MaxY) < maxCha &&
Math.Abs(oriEnve.MinX - nextEnve.MinX) < maxCha &&
Math.Abs(oriEnve.MinY - nextEnve.MinY) < maxCha)
{
isOnly = false;
break;
}
}
}
if (isOnly)
{
outLayer.CreateFeature(ori);
}
StaticTools.progress((i + 2) * 100 / featCount, $"{i + 1} / {featCount}");
}
}
if (IsDelete)
{
shpDataSet.deleteLayerByName(pdLayer.GetName());
}
return(outLayer);
}
/// <summary>
/// 根据区块范围，获取对应的pdx,dzx
/// </summary>
/// <param name="pdLayer"></param>
/// <param name="dzxlayer"></param>
/// <returns></returns>
static List <CutBox> buildTree(OSGeo.OGR.Layer pdLayer, OSGeo.OGR.Layer dzxlayer = null)
{
StaticTools.msgLine("buildTree...");
OSGeo.OGR.Layer cutLayer = createCutLayer(3000);
//用 cutLayer 中的 Featuers 创建一个容器,容器中是对应 Featuer 的 cutBox
List <CutBox> allBoxes = new List <CutBox>();
int cutFeatCount = cutLayer.GetFeatureCount(0);
int pdFeatCount = pdLayer.GetFeatureCount(0);
if (dzxlayer != null)
{
int dzFeatCount = dzxlayer.GetFeatureCount(0);
for (int cuti = 0; cuti < cutFeatCount; cuti++)
{
CutBox cb = new CutBox();
//把与盒子相交的等值线塞入盒子,向外Buffer一定距离，避免尴尬
OSGeo.OGR.Geometry cutGeom = cutLayer.GetFeature(cuti).GetGeometryRef().Buffer(5, 0);
for (int dzi = 0; dzi < dzFeatCount; dzi++)
{
if (cutGeom.Intersect(dzxlayer.GetFeature(dzi).GetGeometryRef()))
{
cb.dzxIDs.Add(dzi);
}
}
allBoxes.Add(cb);
StaticTools.progress((cuti + 1) * 100 / cutFeatCount, $"{cuti}/{cutFeatCount}");
}
}
//遍历坡度线，放入对应的cutBox
//不会重复，要素只会放入第一个匹配上的盒子里
for (int pdi = 0; pdi < pdFeatCount; pdi++)
{
//拿出一个坡度要素
OSGeo.OGR.Geometry aGeom = pdLayer.GetFeature(pdi).GetGeometryRef();
for (int cuti = 0; cuti < cutFeatCount; cuti++)
{
//拿出一个盒子，与要素求交
OSGeo.OGR.Geometry cutGeom = cutLayer.GetFeature(cuti).GetGeometryRef();
if (aGeom.Intersects(cutGeom))
{
//塞入盒子,盒子ID ，坡度线ID
allBoxes[cuti].pdxIDs.Add(pdi);
break;
}
}
StaticTools.progress((pdi + 1) * 100 / pdFeatCount, $"{pdi}/{pdFeatCount}");
}
if (IsDelete)
{
shpDataSet.deleteLayerByName(cutLayer.GetName());
}
return(allBoxes);
}
/// <summary>
/// 通过slope的位置和面积筛选dzxPoly
/// </summary>
/// <param name="slopePolyLayer"></param>
/// <param name="dzxPolyLayer"></param>
/// <returns></returns>
static OSGeo.OGR.Layer selectionFeatuers(OSGeo.OGR.Layer slopePolyLayer, OSGeo.OGR.Layer dzxPolyLayer)
{
shpDataSet.deleteLayerByName("resLayer");
OSGeo.OGR.Layer resLayer = shpDataSet.CreateLayer("resLayer", srs, dzxPolyLayer.GetGeomType(), null);
List <CutBox> selectTree = buildTree(slopePolyLayer, dzxPolyLayer);
StaticTools.msgLine("selection...");
for (int i = 0; i < selectTree.Count; i++)
{
CutBox abox = selectTree[i];
for (int pdi = 0; pdi < abox.pdxIDs.Count; pdi++)
{
int ff = abox.pdxIDs[pdi];
OSGeo.OGR.Geometry pdGeom = slopePolyLayer.GetFeature(ff).GetGeometryRef();
double pdArea = pdGeom.GetArea();
double afterCha = double.MaxValue;
int yesID = -1;
for (int dzi = 0; dzi < abox.dzxIDs.Count; dzi++)
{
int tt = abox.dzxIDs[dzi];
OSGeo.OGR.Geometry dzGeom = dzxPolyLayer.GetFeature(tt).GetGeometryRef();
if (pdGeom.Intersect(dzGeom))
{
double cha = Math.Abs(dzGeom.GetArea() - pdArea);
if (cha < afterCha)
{
afterCha = cha;
yesID = tt;
}
}
}
if (yesID != -1)
{
resLayer.CreateFeature(dzxPolyLayer.GetFeature(yesID));
}
StaticTools.progress((pdi + 1) * 100 / abox.pdxIDs.Count, $"{pdi}/{abox.pdxIDs.Count} @ {i + 1} / {selectTree.Count}");
}
}
if (IsDelete)
{
shpDataSet.deleteLayerByName(slopePolyLayer.GetName());
shpDataSet.deleteLayerByName(dzxPolyLayer.GetName());
}
return(resLayer);
}
