要按照矢量中的几何位置去筛选矢量集合，您可以使用空间查询或选择工具。以下是一些示例：
- 空间查询工具：许多GIS软件都具有空间查询工具，可帮助您筛选矢量。您可以使用矩形选择工具、圆形选择工具或多边形选择工具选择特定区域的矢量。还可以使用空间查询语言（例如SQL）编写复杂的查询来识别满足特定条件的矢量，例如在指定距离内的点或多边形。
- 编写自定义脚本或程序：如果您需要更复杂的筛选，可以编写自定义脚本或程序来筛选矢量。可以使用Python、C ++或其他编程语言来构建您的脚本或程序，以根据坐标、属性或其他条件筛选矢量。
- 使用地图编辑器：一些GIS软件具有地图编辑器，其中包括选择和编辑矢量的工具。这些工具可帮助您在地图上选择特定区域的矢量，并进行编辑或删除。
无论您选择哪种方法，都应该先确定筛选条件，然后使用适当的工具来筛选矢量集合。
安装地球引擎API和geemap
安装地球引擎的Python API和geemap。geemap Python包是建立在ipyleaflet和folium包之上的，它实现了几个与地球引擎数据层交互的方法，比如Map.addLayer()、Map.setCenter()和Map.centerObject()。下面的脚本检查geemap包是否已经安装。如果没有，它将安装geemap，它会自动安装其依赖项，包括earthengine-api、folium和ipyleaflet。
Installs geemap package
import subprocess try: import geemap except ImportError: print('Installing geemap ...') subprocess.check_call(["python", '-m', 'pip', 'install', 'geemap'])
import ee import geemap
函数：
ee.Filter.contains(leftField, rightValue, rightField, leftValue, maxError)
Creates a unary or binary filter that passes if the left geometry contains the right geometry (empty geometries are not contained in anything).
这里需要明确的一点就是这里的Filed就是我们集合中的属性名称，value就是值，这里一般会设定，按照名称或者是属性值的后缀来筛选
Arguments:
leftField (String, default: null):
A selector for the left operand. Should not be specified if leftValue is specified.
rightValue (Object, default: null):
The value of the right operand. Should not be specified if rightField is specified.
rightField (String, default: null):
A selector for the right operand. Should not be specified if rightValue is specified.
leftValue (Object, default: null):
The value of the left operand. Should not be specified if leftField is specified.
maxError (ErrorMargin, optional):
The maximum reprojection error allowed during filter application.
Returns: Filter
代码：
# Add Earth Engine dataset HUC10 = ee.FeatureCollection("USGS/WBD/2017/HUC10") HUC08 = ee.FeatureCollection('USGS/WBD/2017/HUC08') roi = HUC08.filter(ee.Filter.eq('name', 'Pipestem')) Map.centerObject(roi, 10) Map.addLayer(ee.Image().paint(roi, 0, 3), {}, 'HUC08') # select polygons intersecting the roi roi2 = HUC10.filter(ee.Filter.contains(**{'leftValue': roi.geometry(), 'rightField': '.geo'})) Map.addLayer(ee.Image().paint(roi2, 0, 2), {'palette': 'blue'}, 'HUC10') roi3 = HUC10.filter(ee.Filter.stringContains(**{'leftField': 'huc10', 'rightValue': '10160002'})) print(roi3.getInfo()) Map.addLayer(roi3)
结果：
{‘type’: ‘FeatureCollection’, ‘columns’: {‘areaacres’: ‘String’, ‘areasqkm’: ‘String’, ‘gnis_id’: ‘String’, ‘huc10’: ‘String’, ‘humod’: ‘String’, ‘hutype’: ‘String’, ‘loaddate’: ‘String’, ‘metasource’: ‘String’, ‘name’: ‘String’, ‘shape_area’: ‘String’, ‘shape_leng’: ‘String’, ‘sourcedata’: ‘String’, ‘sourcefeat’: ‘String’, ‘sourceorig’: ‘String’, ‘states’: ‘String’, ‘system:index’: ‘String’, ‘tnmid’: ‘String’},。。。。
代码：
# Add Earth Engine dataset # Select North Dakota and South Dakota fc = ee.FeatureCollection('TIGER/2018/States') \ .filter(ee.Filter.Or( ee.Filter.eq('STUSPS', 'ND'), ee.Filter.eq('STUSPS', 'SD'), )) image = ee.Image().paint(fc, 0, 2) # Map.setCenter(-99.844, 37.649, 5) Map.centerObject(fc, 6) Map.addLayer(image, {'palette': 'FF0000'}, 'TIGER/2018/States')
ee.Filter.stringContains(leftField, rightValue, rightField, leftValue)
Creates a unary or binary filter that passes if the left operand, a string, contains the right operand, also a string.
Arguments:
leftField (String, default: null):
A selector for the left operand. Should not be specified if leftValue is specified.
rightValue (Object, default: null):
The value of the right operand. Should not be specified if rightField is specified.
rightField (String, default: null):
A selector for the right operand. Should not be specified if rightValue is specified.
leftValue (Object, default: null):
The value of the left operand. Should not be specified if leftField is specified.
Returns: Filter
ee.Filter.stringStartsWith(leftField, rightValue, rightField, leftValue)
Creates a unary or binary filter that passes if the left operand, a string, starts with the right operand, also a string.
Arguments:
leftField (String, default: null):
A selector for the left operand. Should not be specified if leftValue is specified.
rightValue (Object, default: null):
The value of the right operand. Should not be specified if rightField is specified.
rightField (String, default: null):
A selector for the right operand. Should not be specified if rightValue is specified.
leftValue (Object, default: null):
The value of the left operand. Should not be specified if leftField is specified.
Returns: Filter
按照字符串去筛选：
# Add Earth Engine dataset #!/usr/bin/env python """Select by strings """ # Select states with "A" in its name fc = ee.FeatureCollection('TIGER/2018/States') \ .filter(ee.Filter.stringContains('STUSPS', 'A')) image = ee.Image().paint(fc, 0, 2) Map.centerObject(fc, 6) Map.addLayer(image, {'palette': 'FF0000'}, '*A*') # Select states its name starting with 'A' fc = ee.FeatureCollection('TIGER/2018/States') \ .filter(ee.Filter.stringStartsWith('STUSPS', 'A')) image = ee.Image().paint(fc, 0, 2) Map.addLayer(image, {'palette': '0000FF'}, 'A*')
