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ogr 缓冲区_GDAL的几何操作

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生活随笔收集整理的這篇文章主要介紹了 ogr 缓冲区_GDAL的几何操作小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

Date: 2015-08-13 12:43

Summary: 一段代碼一個小功能，簡單清晰又實用。翻譯自英文的cookbook。Thanks the author for sharing us such a wonderful tutorial！！！

GDAL的幾何操作

創建一個點

from osgeo import ogr

point = ogr.Geometry(ogr.wkbPoint)

point.AddPoint(1198054.34, 648493.09)

print point.ExportToWkt()

創建一條線

from osgeo import ogr

line = ogr.Geometry(ogr.wkbLineString)

line.AddPoint(1116651.439379124, 637392.6969887456)

line.AddPoint(1188804.0108498496, 652655.7409537067)

line.AddPoint(1226730.3625203592, 634155.0816022386)

line.AddPoint(1281307.30760719, 636467.6640211721)

print line.ExportToWkt()

創建多邊形

from osgeo import ogr

# Create ring

ring = ogr.Geometry(ogr.wkbLinearRing)

ring.AddPoint(1179091.1646903288, 712782.8838459781)

ring.AddPoint(1161053.0218226474, 667456.2684348812)

ring.AddPoint(1214704.933941905, 641092.8288590391)

ring.AddPoint(1228580.428455506, 682719.3123998424)

ring.AddPoint(1218405.0658121984, 721108.1805541387)

ring.AddPoint(1179091.1646903288, 712782.8838459781)

# Create polygon

poly = ogr.Geometry(ogr.wkbPolygon)

poly.AddGeometry(ring)

print poly.ExportToWkt()

創建帶洞的多邊形

from osgeo import ogr

# Create outer ring 外環線

outRing = ogr.Geometry(ogr.wkbLinearRing)

outRing.AddPoint(1154115.274565847, 686419.4442701361)

outRing.AddPoint(1154115.274565847, 653118.2574374934)

outRing.AddPoint(1165678.1866605144, 653118.2574374934)

outRing.AddPoint(1165678.1866605144, 686419.4442701361)

outRing.AddPoint(1154115.274565847, 686419.4442701361)

# Create inner ring 內環線

innerRing = ogr.Geometry(ogr.wkbLinearRing)

innerRing.AddPoint(1149490.1097279799, 691044.6091080031)

innerRing.AddPoint(1149490.1097279799, 648030.5761158396)

innerRing.AddPoint(1191579.1097525698, 648030.5761158396)

innerRing.AddPoint(1191579.1097525698, 691044.6091080031)

innerRing.AddPoint(1149490.1097279799, 691044.6091080031)

# Create polygon

poly = ogr.Geometry(ogr.wkbPolygon)

poly.AddGeometry(outRing)

poly.AddGeometry(innerRing)

print poly.ExportToWkt()

創建MultiPoint

from osgeo import ogr

multipoint = ogr.Geometry(ogr.wkbMultiPoint)

point1 = ogr.Geometry(ogr.wkbPoint)

point1.AddPoint(1251243.7361610543, 598078.7958668759)

multipoint.AddGeometry(point1)

point2 = ogr.Geometry(ogr.wkbPoint)

point2.AddPoint(1240605.8570339603, 601778.9277371694)

multipoint.AddGeometry(point2)

point3 = ogr.Geometry(ogr.wkbPoint)

point3.AddPoint(1250318.7031934808, 606404.0925750365)

multipoint.AddGeometry(point3)

print multipoint.ExportToWkt()

創建MultiLineString

from osgeo import ogr

multiline = ogr.Geometry(ogr.wkbMultiLineString)

line1 = ogr.Geometry(ogr.wkbLineString)

line1.AddPoint(1214242.4174581182, 617041.9717021306)

line1.AddPoint(1234593.142744733, 629529.9167643716)

multiline.AddGeometry(line1)

line1 = ogr.Geometry(ogr.wkbLineString)

line1.AddPoint(1184641.3624957693, 626754.8178616514)

line1.AddPoint(1219792.6152635587, 606866.6090588232)

multiline.AddGeometry(line1)

print multiline.ExportToWkt()

創建MultiPolygon

from osgeo import ogr

multipolygon = ogr.Geometry(ogr.wkbMultiPolygon)

# Create ring #1

ring1 = ogr.Geometry(ogr.wkbLinearRing)

ring1.AddPoint(1204067.0548148106, 634617.5980860253)

ring1.AddPoint(1204067.0548148106, 620742.1035724243)

ring1.AddPoint(1215167.4504256917, 620742.1035724243)

ring1.AddPoint(1215167.4504256917, 634617.5980860253)

ring1.AddPoint(1204067.0548148106, 634617.5980860253)

# Create polygon #1

poly1 = ogr.Geometry(ogr.wkbPolygon)

poly1.AddGeometry(ring1)

multipolygon.AddGeometry(poly1)

# Create ring #2

ring2 = ogr.Geometry(ogr.wkbLinearRing)

ring2.AddPoint(1179553.6811741155, 647105.5431482664)

ring2.AddPoint(1179553.6811741155, 626292.3013778647)

ring2.AddPoint(1194354.20865529, 626292.3013778647)

ring2.AddPoint(1194354.20865529, 647105.5431482664)

ring2.AddPoint(1179553.6811741155, 647105.5431482664)

# Create polygon #2

poly2 = ogr.Geometry(ogr.wkbPolygon)

poly2.AddGeometry(ring2)

multipolygon.AddGeometry(poly2)

print multipolygon.ExportToWkt()

創建幾何體集合

from osgeo import ogr

# Create a geometry collection

geomcol = ogr.Geometry(ogr.wkbGeometryCollection)

# Add a point

point = ogr.Geometry(ogr.wkbPoint)

point.AddPoint(-122.23, 47.09)

geomcol.AddGeometry(point)

# Add a line

line = ogr.Geometry(ogr.wkbLineString)

line.AddPoint(-122.60, 47.14)

line.AddPoint(-122.48, 47.23)

geomcol.AddGeometry(line)

print geomcol.ExportToWkt()

從WKT創建Geometry

from osgeo import ogr

wkt = "POINT (1120351.5712494177 741921.4223245403)"

point = ogr.CreateGeometryFromWkt(wkt)

print "%d,%d" % (point.GetX(), point.GetY())

從GeoJSON創建Geometry

from osgeo import ogr

geojson = """{"type":"Point","coordinates":[108420.33,753808.59]}"""

point = ogr.CreateGeometryFromJson(geojson)

print "%d,%d" % (point.GetX(), point.GetY())

從GML創建Geometry

from osgeo import ogr

gml = """108420.33,753808.59"""

point = ogr.CreateGeometryFromGML(gml)

print "%d,%d" % (point.GetX(), point.GetY())

從WKB創建Geometry

from osgeo import ogr

from base64 import b64decode

wkb = b64decode("AIAAAAFBMkfmVwo9cUEjylouFHrhAAAAAAAAAAA=")

point = ogr.CreateGeometryFromWkb(wkb)

print "%d,%d" % (point.GetX(), point.GetY())

統計Geometry中的點數

from osgeo import ogr

wkt = "LINESTRING (1181866.263593049 615654.4222507705, 1205917.1207499576 623979.7189589312, 1227192.8790041457 643405.4112779726, 1224880.2965852122 665143.6860159477)"

geom = ogr.CreateGeometryFromWkt(wkt)

print "Geometry has %i points" % (geom.GetPointCount())

統計Geometry中的幾何體數

from osgeo import ogr

wkt = "MULTIPOINT (1181866.263593049 615654.4222507705, 1205917.1207499576 623979.7189589312, 1227192.8790041457 643405.4112779726, 1224880.2965852122 665143.6860159477)"

geom = ogr.CreateGeometryFromWkt(wkt)

print "Geometry has %i geometries" % (geom.GetGeometryCount())

遍歷Geometry中的幾何體

from osgeo import ogr

wkt = "MULTIPOINT (1181866.263593049 615654.4222507705, 1205917.1207499576 623979.7189589312, 1227192.8790041457 643405.4112779726, 1224880.2965852122 665143.6860159477)"

geom = ogr.CreateGeometryFromWkt(wkt)

for i in range(0, geom.GetGeometryCount()):

g = geom.GetGeometryRef(i)

print "%i). %s" %(i, g.ExportToWkt())

遍歷Geometry中的點

from osgeo import ogr

wkt = "LINESTRING (1181866.263593049 615654.4222507705, 1205917.1207499576 623979.7189589312, 1227192.8790041457 643405.4112779726, 1224880.2965852122 665143.6860159477)"

geom = ogr.CreateGeometryFromWkt(wkt)

for i in range(0, geom.GetPointCount()):

# GetPoint returns a tuple not a Geometry

pt = geom.GetPoint(i)

print "%i). POINT (%d %d)" %(i, pt[0], pt[1])

求Geometry的緩沖區

from osgeo import ogr

wkt = "POINT (1198054.34 648493.09)"

pt = ogr.CreateGeometryFromWkt(wkt)

bufferDistance = 500

poly = pt.Buffer(bufferDistance)

print "%s buffered by %d is %s" % (pt.ExportToWkt(), bufferDistance, poly.ExportToWkt())

計算Geometry包圍盒

from osgeo import ogr

wkt = "LINESTRING (1181866.263593049 615654.4222507705, 1205917.1207499576 623979.7189589312, 1227192.8790041457 643405.4112779726, 1224880.2965852122 665143.6860159477)"

geom = ogr.CreateGeometryFromWkt(wkt)

# Get Envelope returns a tuple (minX, maxX, minY, maxY)

env = geom.GetEnvelope()

print "minX: %d, minY: %d, maxX: %d, maxY: %d" %(env[0],env[2],env[1],env[3])

計算Geometry的面積

from osgeo import ogr

wkt = "POLYGON ((1162440.5712740074 672081.4332727483, 1162440.5712740074 647105.5431482664, 1195279.2416228633 647105.5431482664, 1195279.2416228633 672081.4332727483, 1162440.5712740074 672081.4332727483))"

poly = ogr.CreateGeometryFromWkt(wkt)

print "Area = %d" % poly.GetArea()

計算Geometry的長度

from osgeo import ogr

wkt = "LINESTRING (1181866.263593049 615654.4222507705, 1205917.1207499576 623979.7189589312, 1227192.8790041457 643405.4112779726, 1224880.2965852122 665143.6860159477)"

geom = ogr.CreateGeometryFromWkt(wkt)

print "Length = %d" % geom.Length()

獲取Geometry的類型字符串

from osgeo import ogr

wkts = [

"POINT (1198054.34 648493.09)",

"LINESTRING (1181866.263593049 615654.4222507705, 1205917.1207499576 623979.7189589312, 1227192.8790041457 643405.4112779726, 1224880.2965852122 665143.6860159477)",

"POLYGON ((1162440.5712740074 672081.4332727483, 1162440.5712740074 647105.5431482664, 1195279.2416228633 647105.5431482664, 1195279.2416228633 672081.4332727483, 1162440.5712740074 672081.4332727483))"

]

for wkt in wkts:

geom = ogr.CreateGeometryFromWkt(wkt)

print geom.GetGeometryName()

計算兩個Geometry的交集

from osgeo import ogr

wkt1 = "POLYGON ((1208064.271243039 624154.6783778917, 1208064.271243039 601260.9785661874, 1231345.9998651114 601260.9785661874, 1231345.9998651114 624154.6783778917, 1208064.271243039 624154.6783778917))"

wkt2 = "POLYGON ((1199915.6662253144 633079.3410163528, 1199915.6662253144 614453.958118695, 1219317.1067437078 614453.958118695, 1219317.1067437078 633079.3410163528, 1199915.6662253144 633079.3410163528)))"

poly1 = ogr.CreateGeometryFromWkt(wkt1)

poly2 = ogr.CreateGeometryFromWkt(wkt2)

intersection = poly1.Intersection(poly2)

print intersection.ExportToWkt()

計算兩個Geometry的并集

from osgeo import ogr

poly1 = ogr.CreateGeometryFromWkt(wkt1)

poly2 = ogr.CreateGeometryFromWkt(wkt2)

union = poly1.Union(poly2)

print poly1

print poly2

print union.ExportToWkt()

Geometry保存為GeoJSON

有兩種方法從Geometry創建GeoJSON：可以創建一個新的GeoJSON文件，也可以把geometry導出到JSON，然后打印出來。

from osgeo import ogr

# Create test polygon

ring = ogr.Geometry(ogr.wkbLinearRing)

ring.AddPoint(1179091.1646903288, 712782.8838459781)

ring.AddPoint(1161053.0218226474, 667456.2684348812)

ring.AddPoint(1214704.933941905, 641092.8288590391)

ring.AddPoint(1228580.428455506, 682719.3123998424)

ring.AddPoint(1218405.0658121984, 721108.1805541387)

ring.AddPoint(1179091.1646903288, 712782.8838459781)

poly = ogr.Geometry(ogr.wkbPolygon)

poly.AddGeometry(ring)

# Create the output Driver

outDriver = ogr.GetDriverByName('GeoJSON')

# Create the output GeoJSON

outDataSource = outDriver.CreateDataSource('test.geojson')

outLayer = outDataSource.CreateLayer('test.geojson', geom_type=ogr.wkbPolygon )

# Get the output Layer's Feature Definition

featureDefn = outLayer.GetLayerDefn()

# create a new feature

outFeature = ogr.Feature(featureDefn)

# Set new geometry

outFeature.SetGeometry(poly)

# Add new feature to output Layer

outLayer.CreateFeature(outFeature)

# destroy the feature

outFeature.Destroy

# Close DataSources

outDataSource.Destroy()

from osgeo import ogr

# Create test polygon

ring = ogr.Geometry(ogr.wkbLinearRing)

ring.AddPoint(1179091.1646903288, 712782.8838459781)

ring.AddPoint(1161053.0218226474, 667456.2684348812)

ring.AddPoint(1214704.933941905, 641092.8288590391)

ring.AddPoint(1228580.428455506, 682719.3123998424)

ring.AddPoint(1218405.0658121984, 721108.1805541387)

ring.AddPoint(1179091.1646903288, 712782.8838459781)

poly = ogr.Geometry(ogr.wkbPolygon)

poly.AddGeometry(ring)

geojson = poly.ExportToJson()

print geojson

Geometry保存為WKT

from osgeo import ogr

# Create test polygon

ring = ogr.Geometry(ogr.wkbLinearRing)

ring.AddPoint(1179091.1646903288, 712782.8838459781)

ring.AddPoint(1161053.0218226474, 667456.2684348812)

ring.AddPoint(1214704.933941905, 641092.8288590391)

ring.AddPoint(1228580.428455506, 682719.3123998424)

ring.AddPoint(1218405.0658121984, 721108.1805541387)

ring.AddPoint(1179091.1646903288, 712782.8838459781)

geom_poly = ogr.Geometry(ogr.wkbPolygon)

geom_poly.AddGeometry(ring)

# Export geometry to WKT

wkt = geom_poly.ExportToWkt()

print wkt

Geometry保存為KML

from osgeo import ogr

# Create test polygon

ring = ogr.Geometry(ogr.wkbLinearRing)

ring.AddPoint(1179091.1646903288, 712782.8838459781)

ring.AddPoint(1161053.0218226474, 667456.2684348812)

ring.AddPoint(1214704.933941905, 641092.8288590391)

ring.AddPoint(1228580.428455506, 682719.3123998424)

ring.AddPoint(1218405.0658121984, 721108.1805541387)

ring.AddPoint(1179091.1646903288, 712782.8838459781)

geom_poly = ogr.Geometry(ogr.wkbPolygon)

geom_poly.AddGeometry(ring)

kml = geom_poly.ExportToKML()

print kml

Geometry保存為WKB

from osgeo import ogr

# Create test polygon

ring = ogr.Geometry(ogr.wkbLinearRing)

ring.AddPoint(1179091.1646903288, 712782.8838459781)

ring.AddPoint(1161053.0218226474, 667456.2684348812)

ring.AddPoint(1214704.933941905, 641092.8288590391)

ring.AddPoint(1228580.428455506, 682719.3123998424)

ring.AddPoint(1218405.0658121984, 721108.1805541387)

ring.AddPoint(1179091.1646903288, 712782.8838459781)

geom_poly = ogr.Geometry(ogr.wkbPolygon)

geom_poly.AddGeometry(ring)

# Export geometry to WKT

wkb = geom_poly.ExportToWkb()

print wkb

polygon轉成multipolygon

from osgeo import ogr

# Given a test polygon

poly_wkt= "POLYGON ((1179091.164690328761935 712782.883845978067257,1161053.021822647424415 667456.268434881232679,1214704.933941904921085 641092.828859039116651,1228580.428455505985767 682719.312399842427112,1218405.065812198445201 721108.180554138729349,1179091.164690328761935 712782.883845978067257))"

geom_poly = ogr.CreateGeometryFromWkt(poly_wkt)

# Force a polygon to multipolygon

if geom_poly.GetGeometryType() == ogr.wkbPolygon:

geom_poly = ogr.ForceToMultiPolygon(geom_poly)

# if are iterating over features just to update the geometry

# to multipolygon you can update the geometry using "feature.SetGeometryDirectly(geom_poly)"

# Then export geometry to WKT

wkt = geom_poly.ExportToWkt()

print wkt

四分多邊形并且創建中心點

import ogr

# Given a test polygon

poly_Wkt= "POLYGON((-107.42631019589980212 40.11971708125970082,-107.42455436683293613 40.12061219666851741,-107.42020981542387403 40.12004414402532859,-107.41789122063043749 40.12149008687303819,-107.41419947746419439 40.11811617239460048,-107.41915181585792993 40.11761695654455906,-107.41998470913324581 40.11894245264452508,-107.42203317637793702 40.1184088144647788,-107.42430674991324224 40.1174448122981957,-107.42430674991324224 40.1174448122981957,-107.42631019589980212 40.11971708125970082))"

geom_poly = ogr.CreateGeometryFromWkt(poly_Wkt)

# Create 4 square polygons

geom_poly_envelope = geom_poly.GetEnvelope()

minX = geom_poly_envelope[0]

minY = geom_poly_envelope[2]

maxX = geom_poly_envelope[1]

maxY = geom_poly_envelope[3]

'''

coord0----coord1----coord2

| | |

coord3----coord4----coord5

| | |

coord6----coord7----coord8

'''

coord0 = minX, maxY

coord1 = minX+(maxX-minX)/2, maxY

coord2 = maxX, maxY

coord3 = minX, minY+(maxY-minY)/2

coord4 = minX+(maxX-minX)/2, minY+(maxY-minY)/2

coord5 = maxX, minY+(maxY-minY)/2

coord6 = minX, minY

coord7 = minX+(maxX-minX)/2, minY

coord8 = maxX, minY

ringTopLeft = ogr.Geometry(ogr.wkbLinearRing)

ringTopLeft.AddPoint_2D(*coord0)

ringTopLeft.AddPoint_2D(*coord1)

ringTopLeft.AddPoint_2D(*coord4)

ringTopLeft.AddPoint_2D(*coord3)

ringTopLeft.AddPoint_2D(*coord0)

polyTopLeft = ogr.Geometry(ogr.wkbPolygon)

polyTopLeft.AddGeometry(ringTopLeft)

ringTopRight = ogr.Geometry(ogr.wkbLinearRing)

ringTopRight.AddPoint_2D(*coord1)

ringTopRight.AddPoint_2D(*coord2)

ringTopRight.AddPoint_2D(*coord5)

ringTopRight.AddPoint_2D(*coord4)

ringTopRight.AddPoint_2D(*coord1)

polyTopRight = ogr.Geometry(ogr.wkbPolygon)

polyTopRight.AddGeometry(ringTopRight)

ringBottomLeft = ogr.Geometry(ogr.wkbLinearRing)

ringBottomLeft.AddPoint_2D(*coord3)

ringBottomLeft.AddPoint_2D(*coord4)

ringBottomLeft.AddPoint_2D(*coord7)

ringBottomLeft.AddPoint_2D(*coord6)

ringBottomLeft.AddPoint_2D(*coord3)

polyBottomLeft = ogr.Geometry(ogr.wkbPolygon)

polyBottomLeft.AddGeometry(ringBottomLeft)

ringBottomRight = ogr.Geometry(ogr.wkbLinearRing)

ringBottomRight.AddPoint_2D(*coord4)

ringBottomRight.AddPoint_2D(*coord5)

ringBottomRight.AddPoint_2D(*coord8)

ringBottomRight.AddPoint_2D(*coord7)

ringBottomRight.AddPoint_2D(*coord4)

polyBottomRight = ogr.Geometry(ogr.wkbPolygon)

polyBottomRight.AddGeometry(ringBottomRight)

# Intersect 4 squares polygons with test polygon

quaterPolyTopLeft = polyTopLeft.Intersection(geom_poly)

quaterPolyTopRight = polyTopRight.Intersection(geom_poly)

quaterPolyBottomLeft = polyBottomLeft.Intersection(geom_poly)

quaterPolyBottomRight = polyBottomRight.Intersection(geom_poly)

# Create centroids of each intersected polygon

centroidTopLeft = quaterPolyTopLeft.Centroid()

centroidTopRight = quaterPolyTopRight.Centroid()

centroidBottomLeft = quaterPolyBottomLeft.Centroid()

centroidBottomRight = quaterPolyBottomRight.Centroid()

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