GeometryAdapter.py
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# coding=utf-8
#author: 4N
#createtime: 2021/6/3
#email: nheweijun@sina.com
from osgeo import ogr,gdal
from osgeo.ogr import Geometry
class GeometryAdapter:
@classmethod
def getType(cls,layer):
origin = layer.GetGeomType() # type:str
if origin == 1 or origin == 4:
return "point"
elif origin == 2 or origin == 5:
return "linestring"
elif origin == 3 or origin == 6:
return "polygon"
return str(origin)
@classmethod
def change_geom_type(cls,raw):
if raw==2 or raw ==3:
return raw+3
if raw==4:
return 1
if raw==-2147483647 or raw.__eq__(-2147483644):
return 1
if raw==-2147483646 or raw.__eq__(-2147483643):
return 5
if raw==-2147483645 or raw.__eq__(-2147483642):
return 6
return raw
@classmethod
def change_geom(cls,geo:Geometry,geom_type):
'''
转换空间对象的类型，以适应dmap只支持Multi类型
:param geo:
:param geom_type:
:return: 转换后的空间对象
'''
# Point = 1,
# LineString = 2,
# Polygon = 3,
# MultiPoint = 4,
# MultiLineString = 5,
# MultiPolygon = 6,
# GeometryCollection = 7,
# CircularString = 8,
# CompoundCurve = 9,
# CurvePolygon = 10,
# MultiCurve = 11,
# MultiSurface = 12,
# PolyhedralSurface = 15,
# LinearRing = 101,
# MultiPointZ = -2147483644
# MultiLineStringZ = -2147483643
# MultiPolygonZ = -2147483642
# PointZ = -2147483647
# LINESTRINGZ=-2147483646
# POLYGONZ=-2147483645
if geom_type==5 or geom_type.__eq__(-2147483646) or geom_type.__eq__(-2147483643):
return ogr.ForceToMultiLineString(geo)
if geom_type==6 or geom_type.__eq__(-2147483645) or geom_type.__eq__(-2147483642):
return ogr.ForceToMultiPolygon(geo)
if geom_type==1:
return geo.Centroid()
return geo
@classmethod
def get_table_type(cls, raw):
# Point = 1,
# LineString = 2,
# Polygon = 3,
# MultiPoint = 4,
# MultiLineString = 5,
# MultiPolygon = 6,
# GeometryCollection = 7,
# CircularString = 8,
# CompoundCurve = 9,
# CurvePolygon = 10,
# MultiCurve = 11,
# MultiSurface = 12,
# PolyhedralSurface = 15,
# LinearRing = 101,
# MultiPointZ = -2147483644
# MultiLineStringZ = -2147483643
# MultiPolygonZ = -2147483642
# PointZ = -2147483647
# LINESTRINGZ=-2147483646
# POLYGONZ=-2147483645
if raw == 4 or raw == 5 or raw == 6:
return raw - 3
elif raw == -2147483644 or raw == -2147483647:
return 1
elif raw == -2147483643 or raw == -2147483646:
return 2
elif raw == -2147483642 or raw == -2147483645:
return 3
return raw
def move(self,geo: Geometry, offx, offy):
g = geo.GetGeometryRef(0)
num = g.GetPointCount()
coor = []
for j in range(num):
point = g.GetPoint(j)
x = point[0]
y = point[1]
x += offx
y += offy
coor.append([x, y])
if num == 1:
point = ogr.Geometry(ogr.wkbPoint)
point.AddPoint(coor[0][0], coor[0][1])
return point
elif coor[0].__eq__(coor[-1]):
ring = ogr.Geometry(ogr.wkbLinearRing)
for co in coor:
ring.AddPoint(co[0], co[1])
poly = ogr.Geometry(ogr.wkbPolygon)
poly.AddGeometry(ring)
return poly
else:
line = ogr.Geometry(ogr.wkbLineString)
for co in coor:
line.AddPoint(co[0], co[1])
return line
@classmethod
def envelop_2_polygon(cls,env):
ring = ogr.Geometry(ogr.wkbLinearRing)
ring.AddPoint(env[0], env[2])
ring.AddPoint(env[0], env[3])
ring.AddPoint(env[1], env[3])
ring.AddPoint(env[1], env[2])
ring.AddPoint(env[0], env[2])
# Create polygon
poly = ogr.Geometry(ogr.wkbPolygon)
poly.AddGeometry(ring)
return poly
@classmethod
def bbox_2_polygon(cls,bbox):
ring = ogr.Geometry(ogr.wkbLinearRing)
ring.AddPoint(bbox[0], bbox[1])
ring.AddPoint(bbox[0], bbox[3])
ring.AddPoint(bbox[2], bbox[3])
ring.AddPoint(bbox[2], bbox[1])
ring.AddPoint(bbox[0], bbox[1])
# Create polygon
poly = ogr.Geometry(ogr.wkbPolygon)
poly.AddGeometry(ring)
return poly
@classmethod
def tuple_2_point(cls,tup):
point = ogr.Geometry(ogr.wkbPoint)
point.AddPoint(tup[0], tup[1])
return point
@classmethod
def get_geometry_type(cls,layer):
geom_type = layer.GetGeomType()
if geom_type.__eq__(0):
fea = layer.GetNextFeature()
if fea:
g: Geometry = fea.geometry()
geom_type = g.GetGeometryType()
layer.ResetReading()
return geom_type
@classmethod
def convert(cls, geometry: Geometry, bbox, xy_res):
'''
根据Geometry和bbox将空间对象栅格化
:param geometry: 空间对象
:param bbox: 栅格化范围
:param xy_res: 分辨率
:return:
'''
# 计算像素大小
x_min, y_min, x_max, y_max = bbox
pixel_size = (x_max - x_min) / xy_res
# 创建内存栅格对象
target_ds = gdal.GetDriverByName('MEM').Create('', xy_res, xy_res, gdal.GDT_Byte)
target_ds.SetGeoTransform((x_min, pixel_size, 0, y_max, 0, -pixel_size))
band = target_ds.GetRasterBand(1)
# 创建内存图层对象，因为gdal只提供栅格化图层的方法
layer_ds = ogr.GetDriverByName('Memory').CreateDataSource('')
mem_layer = layer_ds.CreateLayer("mem", geom_type=ogr.wkbUnknown)
feature_defn = mem_layer.GetLayerDefn()
feature = ogr.Feature(feature_defn)
feature.SetGeometry(geometry)
mem_layer.CreateFeature(feature)
# 栅格化
gdal.RasterizeLayer(target_ds, [1], mem_layer, burn_values=[1])
data = band.ReadAsArray()
del target_ds
del layer_ds
# Read as array
return data