1. New GeoPackage Layer 2. 选择上一步创建的.gpkg 3. 矢量类型选择line 4. 增添Filed: name: name; type: text. 注意要点击Add to filed lists才能真正增添filed 5. Ok 6. 选择Add New Layer 在已有的database中(.gpkg)创建一个新图层(river) 切换到编辑模式,增添Line,注意河流流向是从上游到下游。支...
lineVecLayer.startEditing()print("editing layer:%s..."% (layername)) points = [QgsPoint(minx, miny), QgsPoint(minx, maxy), QgsPoint(maxx, maxy), QgsPoint(maxx, miny), QgsPoint(minx, miny)]# create featureprint("add feature to layer:%s..."% (layername)) line_feature = QgsFeature(...
回到主界面,在左下角搜索point to path,点开: 在Path group expression里面填trip_id 运行之后,在左侧会多一个Path的Layer,把之前筛选出的数据点连接成了线 分别在地图,公交路线图,地铁路线图里对比上述点和线的图册来确定不同段数据的出行模式。 可以参考不同点的时间,位置信息,速度信息等。 具体例子 不在地...
fromqgis.coreimport*fromqgis.processingimport*# 获取当前工程project = QgsProject.instance()# 获取指定的点图层 (请替换 "your_point_layer_name" 为你的点图层名称)point_layer = project.mapLayersByName("your_point_layer_name")[0]# 检查图层是否存在ifpoint_layerisNone: print("指定的点图层不存在!"...
开发者ID:Nald,项目名称:Quantum-GIS,代码行数:26,代码来源:AddTableField.py 示例2: processAlgorithm ▲点赞 7▼ defprocessAlgorithm(self, progress):layer =QGisLayers.getObjectFromUri(self.getParameterValue(self.LAYERNAME)) attribute = self.getParameterValue(self.ATTRIBUTE) ...
Nyall DawsonWhen a layer changes from non-spatial to s...1cf97345天前 89847 次提交 提交取消 提示:由于 Git 不支持空文件夾,创建文件夹后会生成空的 .keep 文件 .ci Handle the case in whichpodman composeordocker composefail 15天前 .docker ...
dataProvider->addFeatures(QgsFeatureList()<<MyFeature); pointLayer->updateExtents(); //pointLayer->setCoordinateSystem(); 在图层插入线要素(QgsFeature) //创建一个线图层QgsVectorLayer *lineLayer =newQgsVectorLayer("LineString?crs=epsg:4326","MyLine","memory"); ...
Next, change theSymbol layer typetoMarkerline. SelectoncenterpointunderMarker placement. Click on theSimplemarkersymbol. Scroll down and pick thefilled_arrowheadmarker. You will see that the arrow-like symbol now appears on the one-way streets. But all of them are pointing in a single direction...
domlyszAdd layer tree indicator for layers with joined fields 92c120aOct 19, 2018 Git stats 51,355commits Failed to load latest commit information. Type Name Latest commit message Commit time .ci/travis .docker .github .tx cmake cmake_templates ...
start_point=QgsPointXY(10,10) end_point=QgsPointXY(20,20) #使用Processing框架进行网络分析 params={ INPUT:network_layer, START_POINT:start_point, END_POINT:end_point, STRATEGY:0, OUTPUT:/path/to/output/network_analysis.shp } Processing.runAlgorithm(qgis:shortestpath,params) #清理QGIS环境 app...