GEE添加影像(通过名称)

通过数据集名称加载数据

主要功能

通过数据集名称加载数据

代码

// Display an image given its ID.

var image = ee.Image('CGIAR/SRTM90_V4');
// Center the Map.
Map.setCenter(-110, 40, 5);
// Display the image.
Map.addLayer(image, {min: 0, max: 3000}, 'SRTM');

步骤分析

  1. 创建ee影像对象,通过影像数据集名称来筛选数据
  2. 地图对象设置显示中心,缩放等级
  3. 添加图层,设置显示参数

主要方法

  1. ee.Image()

An object to represent an Earth Engine image. This constructor accepts a variety of arguments:

  • A string: an EarthEngine asset id,
  • A string and a number - an EarthEngine asset id and version,
  • A number or EEArray: creates a constant image,
  • A list: creates an image out of each list element and combines them into a single image,
  • An ee.Image: returns the argument,
  • Nothing: results in an empty transparent image.
    Arguments:
    args (Image|List|Number|Object|String, optional):
    Constructor argument.
    Returns: Image

    创建一个ee对象构造器,可以接受多种输入参数:

    • 字符串参数,一个ee的asset id
    • 字符串参数和一个数字,一个ee的asset id和版本号
    • 一个数字或者一个ee的数组,创建一个常量图层
    • 一个列表
    • 一个ee影像对象,返回参数
    • 空值,返回一个透明图层
    1. Map.setCenter()

    Centers the map view at a given coordinates with the given zoom level.
    Returns the map.
    Arguments:
    lon (Number):
    The longitude of the center, in degrees.
    lat (Number):
    The latitude of the center, in degrees.
    zoom (Number, optional):
    The zoom level, from 1 to 24.
    Returns: ui.Map

    设置Map对象的中心值,经纬度,缩放等级

    • 经纬度,十进制数值,东经为正,西经为负,北纬为正,南纬为负
    • 缩放等级,从1到24级,1级为全球,24级为缩放最大
    1. Map.addLayer()

    Adds a given EE object to the map as a layer.
    Returns the new map layer.
    Arguments:
    eeObject (Collection|Feature|Image|MapId):
    The object to add to the map.
    visParams (FeatureVisualizationParameters|ImageVisualizationParameters, optional):
    The visualization parameters. For Images and ImageCollection, see ee.data.getMapId for valid parameters. For Features and FeatureCollections, the only supported key is "color", as a CSS 3.0 color string or a hex string in "RRGGBB" format.
    name (String, optional):
    The name of the layer. Defaults to "Layer N".
    shown (Boolean, optional):
    A flag indicating whether the layer should be on by default.
    opacity (Number, optional):
    The layer's opacity represented as a number between 0 and 1. Defaults to 1.
    Returns: ui.Map.Layer

    添加一个已有的ee对象到Map对象中作为一个图层
    输入参数:

    • ee对象(Collection|Feature|Image|MapId)
    • 显示参数
    • 名称,赋予图层一个别名
    • 默认是否显示,使用一个布尔值,默认为显示
    • 透明度,1为不透明,0为透明

    你可能感兴趣的:(GEE添加影像(通过名称))