我想按雪(如果有)和冰的类别对冰川区域进行分类,但最重要的是:在旧冰和新鲜冰之间。它们具有可以在野外识别的不同属性,但是您可以使用卫星数据吗?(最好是Landsat,因为其空间分辨率为30 / 15m)
我想按雪(如果有)和冰的类别对冰川区域进行分类,但最重要的是:在旧冰和新鲜冰之间。它们具有可以在野外识别的不同属性,但是您可以使用卫星数据吗?(最好是Landsat,因为其空间分辨率为30 / 15m)
Answers:
这是一个示例,可以帮助您使用Sentinel-1的C波段开始使用Google Earth Engine:
var pt = ee.Geometry.Point(96.7868, 29.31409);
// Filter collection around point. Also read up on Sentinel-1's
// polarization
var collection = ee.ImageCollection('COPERNICUS/S1_GRD').filterBounds(pt)
.filter(ee.Filter.listContains('transmitterReceiverPolarisation', 'VV'))
.select('VV');
// select an appropriate date
var beforesnow = collection.filterDate('2016-11-01', '2016-12-01').mosaic();
var aftersnow = collection.filterDate('2017-02-01', '2017-03-01').mosaic();
// bands for Sentinel-2
var bands = ['B2', 'B3', 'B4'];
// Some Sentinel-2 images for reference
var S2 = ee.ImageCollection('COPERNICUS/S2').filterBounds(pt)
.select(bands);
var S2before = S2.filterDate('2016-10-01', '2016-11-30').mosaic();
var S2after = S2.filterDate('2017-01-01', '2017-02-01').mosaic();
Map.addLayer(S2before, {bands: ['B4', 'B3', 'B2'], min: 300,max: 5000}, 'S2 Before');
Map.addLayer(S2after, {bands: ['B4', 'B3', 'B2'], min:873,max: 12522}, 'S2 After');
Map.centerObject(pt, 13);
// you may change the min, max later when tinkering with the layers tab in // the map
Map.addLayer(beforesnow, {min:-30,max:0}, 'Before snow');
Map.addLayer(aftersnow, {min:-30,max:0}, 'After snow');
//Some information on the Sentinel-1 collection
print('Collection: ', collection);
您将必须使用此处提到的监督分类算法对图像进行分类:https : //developers.google.com/earth-engine/classification
有关使用Sentinel-1的更多信息 https://developers.google.com/earth-engine/sentinel1
在Google Earth Engine和冰川上:http : //www.geo.uzh.ch/~mzemp/share/scratch/msc/MSc.Thesis_NoahZeltner_UsingGoogleEarthEngineForGlobalGlacierChangeAssessment.pdf
在SAR和冰川地区:http: //www.sciencedirect.com/science/article/pii/S0034425713001703