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ee.Filter.greaterThan
使用集合让一切井井有条
根据您的偏好保存内容并对其进行分类。
创建一个单元或二元过滤器,如果左操作数大于右操作数,则通过过滤。
用法 | 返回 |
---|
ee.Filter.greaterThan(leftField, rightValue, rightField, leftValue) | 过滤 |
参数 | 类型 | 详细信息 |
---|
leftField | 字符串,默认值:null | 左操作数的选择器。如果指定了 leftValue,则不应指定此值。 |
rightValue | 对象,默认值:null | 右操作数的值。如果指定了 rightField,则不应指定此字段。 |
rightField | 字符串,默认值:null | 右操作数的选择器。如果指定了 rightValue,则不应指定此参数。 |
leftValue | 对象,默认值:null | 左操作数的值。如果指定了 leftField,则不应指定此参数。 |
示例
Code Editor (JavaScript)
// Field site vegetation characteristics from projects in western USA.
var fc = ee.FeatureCollection('BLM/AIM/v1/TerrADat/TerrestrialAIM')
.filter('ProjectName == "Colorado NWDO Kremmling FO 2016"');
// Display field plots on the map.
Map.setCenter(-107.792, 39.871, 7);
Map.addLayer(fc);
// Compare the per-feature values of two properties and filter the collection
// based on the results of various relational expressions. The two properties
// to compare are invasive and non-invasive annual forb cover at each plot.
var leftProperty = 'InvAnnForbCover_AH';
var rightProperty = 'NonInvAnnForbCover_AH';
print('Plots where invasive forb cover is…');
print('…EQUAL to non-invasive cover',
fc.filter(ee.Filter.equals(
{leftField: leftProperty, rightField: rightProperty})));
print('…NOT EQUAL to non-invasive cover',
fc.filter(ee.Filter.notEquals(
{leftField: leftProperty, rightField: rightProperty})));
print('…LESS THAN non-invasive cover',
fc.filter(ee.Filter.lessThan(
{leftField: leftProperty, rightField: rightProperty})));
print('…LESS THAN OR EQUAL to non-invasive cover',
fc.filter(ee.Filter.lessThanOrEquals(
{leftField: leftProperty, rightField: rightProperty})));
print('…GREATER THAN non-invasive cover',
fc.filter(ee.Filter.greaterThan(
{leftField: leftProperty, rightField: rightProperty})));
print('…GREATER THAN OR EQUAL to non-invasive cover',
fc.filter(ee.Filter.greaterThanOrEquals(
{leftField: leftProperty, rightField: rightProperty})));
print('…is not greater than 10 percent different than non-invasive cover',
fc.filter(ee.Filter.maxDifference(
{difference: 10, leftField: leftProperty, rightField: rightProperty})));
// Instead of comparing values of two feature properties using the leftField
// and rightField parameters, you can compare a property value (leftProperty)
// against a constant value (rightValue).
print('Plots where invasive forb cover is greater than 20%',
fc.filter(ee.Filter.greaterThan(
{leftField: leftProperty, rightValue: 20})));
// You can also swap the operands to assign the constant to the left side of
// the relational expression (leftValue) and the feature property on the right
// (rightField). Here, we get the complement of the previous example.
print('Plots where 20% is greater than invasive forb cover.',
fc.filter(ee.Filter.greaterThan(
{leftValue: 20, rightField: leftProperty})));
// Binary filters are useful in joins. For example, group all same-site plots
// together using a saveAll join.
var groupingProp = 'SiteID';
var sitesFc = fc.distinct(groupingProp);
var joinFilter = ee.Filter.equals(
{leftField: groupingProp, rightField: groupingProp});
var groupedPlots = ee.Join.saveAll('site_plots').apply(sitesFc, fc, joinFilter);
print('List of plots in first site', groupedPlots.first().get('site_plots'));
Python 设置
如需了解 Python API 以及如何使用 geemap
进行交互式开发,请参阅
Python 环境页面。
import ee
import geemap.core as geemap
Colab (Python)
# Field site vegetation characteristics from projects in western USA.
fc = ee.FeatureCollection('BLM/AIM/v1/TerrADat/TerrestrialAIM').filter(
'ProjectName == "Colorado NWDO Kremmling FO 2016"'
)
# Display field plots on the map.
m = geemap.Map()
m.set_center(-107.792, 39.871, 7)
m.add_layer(fc)
display(m)
# Compare the per-feature values of two properties and filter the collection
# based on the results of various relational expressions. The two properties
# to compare are invasive and non-invasive annual forb cover at each plot.
left_property = 'InvAnnForbCover_AH'
right_property = 'NonInvAnnForbCover_AH'
display('Plots where invasive forb cover is…')
display(
'…EQUAL to non-invasive cover',
fc.filter(
ee.Filter.equals(leftField=left_property, rightField=right_property)
),
)
display(
'…NOT EQUAL to non-invasive cover',
fc.filter(
ee.Filter.notEquals(leftField=left_property, rightField=right_property)
),
)
display(
'…LESS THAN non-invasive cover',
fc.filter(
ee.Filter.lessThan(leftField=left_property, rightField=right_property)
),
)
display(
'…LESS THAN OR EQUAL to non-invasive cover',
fc.filter(
ee.Filter.lessThanOrEquals(
leftField=left_property, rightField=right_property
)
),
)
display(
'…GREATER THAN non-invasive cover',
fc.filter(
ee.Filter.greaterThan(
leftField=left_property, rightField=right_property
)
),
)
display(
'…GREATER THAN OR EQUAL to non-invasive cover',
fc.filter(
ee.Filter.greaterThanOrEquals(
leftField=left_property, rightField=right_property
)
),
)
display(
'…is not greater than 10 percent different than non-invasive cover',
fc.filter(
ee.Filter.maxDifference(
difference=10, leftField=left_property, rightField=right_property
)
),
)
# Instead of comparing values of two feature properties using the leftField
# and rightField parameters, you can compare a property value (left_property)
# against a constant value (rightValue).
display(
'Plots where invasive forb cover is greater than 20%',
fc.filter(ee.Filter.greaterThan(leftField=left_property, rightValue=20)),
)
# You can also swap the operands to assign the constant to the left side of
# the relational expression (leftValue) and the feature property on the right
# (rightField). Here, we get the complement of the previous example.
display(
'Plots where 20% is greater than invasive forb cover.',
fc.filter(ee.Filter.greaterThan(leftValue=20, rightField=left_property)),
)
# Binary filters are useful in joins. For example, group all same-site plots
# together using a saveAll join.
grouping_prop = 'SiteID'
sites_fc = fc.distinct(grouping_prop)
join_filter = ee.Filter.equals(
leftField=grouping_prop, rightField=grouping_prop
)
grouped_plots = ee.Join.saveAll('site_plots').apply(sites_fc, fc, join_filter)
display('List of plots in first site', grouped_plots.first().get('site_plots'))
如未另行说明,那么本页面中的内容已根据知识共享署名 4.0 许可获得了许可,并且代码示例已根据 Apache 2.0 许可获得了许可。有关详情,请参阅 Google 开发者网站政策。Java 是 Oracle 和/或其关联公司的注册商标。
最后更新时间 (UTC):2025-07-25。
[null,null,["最后更新时间 (UTC):2025-07-25。"],[[["\u003cp\u003eCreates a unary or binary filter that passes if the left operand is greater than the right operand.\u003c/p\u003e\n"],["\u003cp\u003eThe filter can compare two properties of a feature or a property against a constant value.\u003c/p\u003e\n"],["\u003cp\u003eIt can be used for filtering feature collections based on relational expressions.\u003c/p\u003e\n"],["\u003cp\u003eUseful in joins to group features based on shared properties.\u003c/p\u003e\n"]]],["The core functionality described is creating a filter where the left operand is greater than the right. This `ee.Filter.greaterThan()` function compares either two fields or a field and a value. It accepts `leftField` and `rightField` to compare properties, or `leftValue` and `rightValue` for field-to-value comparisons. The filter is used within the context of filtering feature collections and performing joins based on relational comparisons, for example finding the plots with invasive forb cover greater than a non-invasive one.\n"],null,["# ee.Filter.greaterThan\n\nCreates a unary or binary filter that passes if the left operand is greater than the right operand.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|------------------------------------------------------------------------------------------|---------|\n| `ee.Filter.greaterThan(`*leftField* `, `*rightValue* `, `*rightField* `, `*leftValue*`)` | Filter |\n\n| Argument | Type | Details |\n|--------------|-----------------------|---------------------------------------------------------------------------------------|\n| `leftField` | String, default: null | A selector for the left operand. Should not be specified if leftValue is specified. |\n| `rightValue` | Object, default: null | The value of the right operand. Should not be specified if rightField is specified. |\n| `rightField` | String, default: null | A selector for the right operand. Should not be specified if rightValue is specified. |\n| `leftValue` | Object, default: null | The value of the left operand. Should not be specified if leftField is specified. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Field site vegetation characteristics from projects in western USA.\nvar fc = ee.FeatureCollection('BLM/AIM/v1/TerrADat/TerrestrialAIM')\n .filter('ProjectName == \"Colorado NWDO Kremmling FO 2016\"');\n\n// Display field plots on the map.\nMap.setCenter(-107.792, 39.871, 7);\nMap.addLayer(fc);\n\n// Compare the per-feature values of two properties and filter the collection\n// based on the results of various relational expressions. The two properties\n// to compare are invasive and non-invasive annual forb cover at each plot.\nvar leftProperty = 'InvAnnForbCover_AH';\nvar rightProperty = 'NonInvAnnForbCover_AH';\n\nprint('Plots where invasive forb cover is...');\n\nprint('...EQUAL to non-invasive cover',\n fc.filter(ee.Filter.equals(\n {leftField: leftProperty, rightField: rightProperty})));\n\nprint('...NOT EQUAL to non-invasive cover',\n fc.filter(ee.Filter.notEquals(\n {leftField: leftProperty, rightField: rightProperty})));\n\nprint('...LESS THAN non-invasive cover',\n fc.filter(ee.Filter.lessThan(\n {leftField: leftProperty, rightField: rightProperty})));\n\nprint('...LESS THAN OR EQUAL to non-invasive cover',\n fc.filter(ee.Filter.lessThanOrEquals(\n {leftField: leftProperty, rightField: rightProperty})));\n\nprint('...GREATER THAN non-invasive cover',\n fc.filter(ee.Filter.greaterThan(\n {leftField: leftProperty, rightField: rightProperty})));\n\nprint('...GREATER THAN OR EQUAL to non-invasive cover',\n fc.filter(ee.Filter.greaterThanOrEquals(\n {leftField: leftProperty, rightField: rightProperty})));\n\nprint('...is not greater than 10 percent different than non-invasive cover',\n fc.filter(ee.Filter.maxDifference(\n {difference: 10, leftField: leftProperty, rightField: rightProperty})));\n\n// Instead of comparing values of two feature properties using the leftField\n// and rightField parameters, you can compare a property value (leftProperty)\n// against a constant value (rightValue).\nprint('Plots where invasive forb cover is greater than 20%',\n fc.filter(ee.Filter.greaterThan(\n {leftField: leftProperty, rightValue: 20})));\n\n// You can also swap the operands to assign the constant to the left side of\n// the relational expression (leftValue) and the feature property on the right\n// (rightField). Here, we get the complement of the previous example.\nprint('Plots where 20% is greater than invasive forb cover.',\n fc.filter(ee.Filter.greaterThan(\n {leftValue: 20, rightField: leftProperty})));\n\n// Binary filters are useful in joins. For example, group all same-site plots\n// together using a saveAll join.\nvar groupingProp = 'SiteID';\nvar sitesFc = fc.distinct(groupingProp);\n\nvar joinFilter = ee.Filter.equals(\n {leftField: groupingProp, rightField: groupingProp});\n\nvar groupedPlots = ee.Join.saveAll('site_plots').apply(sitesFc, fc, joinFilter);\nprint('List of plots in first site', groupedPlots.first().get('site_plots'));\n```\nPython setup\n\nSee the [Python Environment](/earth-engine/guides/python_install) page for information on the Python API and using\n`geemap` for interactive development. \n\n```python\nimport ee\nimport geemap.core as geemap\n```\n\n### Colab (Python)\n\n```python\n# Field site vegetation characteristics from projects in western USA.\nfc = ee.FeatureCollection('BLM/AIM/v1/TerrADat/TerrestrialAIM').filter(\n 'ProjectName == \"Colorado NWDO Kremmling FO 2016\"'\n)\n\n# Display field plots on the map.\nm = geemap.Map()\nm.set_center(-107.792, 39.871, 7)\nm.add_layer(fc)\ndisplay(m)\n\n# Compare the per-feature values of two properties and filter the collection\n# based on the results of various relational expressions. The two properties\n# to compare are invasive and non-invasive annual forb cover at each plot.\nleft_property = 'InvAnnForbCover_AH'\nright_property = 'NonInvAnnForbCover_AH'\n\ndisplay('Plots where invasive forb cover is...')\n\ndisplay(\n '...EQUAL to non-invasive cover',\n fc.filter(\n ee.Filter.equals(leftField=left_property, rightField=right_property)\n ),\n)\n\ndisplay(\n '...NOT EQUAL to non-invasive cover',\n fc.filter(\n ee.Filter.notEquals(leftField=left_property, rightField=right_property)\n ),\n)\n\ndisplay(\n '...LESS THAN non-invasive cover',\n fc.filter(\n ee.Filter.lessThan(leftField=left_property, rightField=right_property)\n ),\n)\n\ndisplay(\n '...LESS THAN OR EQUAL to non-invasive cover',\n fc.filter(\n ee.Filter.lessThanOrEquals(\n leftField=left_property, rightField=right_property\n )\n ),\n)\n\ndisplay(\n '...GREATER THAN non-invasive cover',\n fc.filter(\n ee.Filter.greaterThan(\n leftField=left_property, rightField=right_property\n )\n ),\n)\n\ndisplay(\n '...GREATER THAN OR EQUAL to non-invasive cover',\n fc.filter(\n ee.Filter.greaterThanOrEquals(\n leftField=left_property, rightField=right_property\n )\n ),\n)\n\ndisplay(\n '...is not greater than 10 percent different than non-invasive cover',\n fc.filter(\n ee.Filter.maxDifference(\n difference=10, leftField=left_property, rightField=right_property\n )\n ),\n)\n\n# Instead of comparing values of two feature properties using the leftField\n# and rightField parameters, you can compare a property value (left_property)\n# against a constant value (rightValue).\ndisplay(\n 'Plots where invasive forb cover is greater than 20%',\n fc.filter(ee.Filter.greaterThan(leftField=left_property, rightValue=20)),\n)\n\n# You can also swap the operands to assign the constant to the left side of\n# the relational expression (leftValue) and the feature property on the right\n# (rightField). Here, we get the complement of the previous example.\ndisplay(\n 'Plots where 20% is greater than invasive forb cover.',\n fc.filter(ee.Filter.greaterThan(leftValue=20, rightField=left_property)),\n)\n\n# Binary filters are useful in joins. For example, group all same-site plots\n# together using a saveAll join.\ngrouping_prop = 'SiteID'\nsites_fc = fc.distinct(grouping_prop)\n\njoin_filter = ee.Filter.equals(\n leftField=grouping_prop, rightField=grouping_prop\n)\n\ngrouped_plots = ee.Join.saveAll('site_plots').apply(sites_fc, fc, join_filter)\ndisplay('List of plots in first site', grouped_plots.first().get('site_plots'))\n```"]]