google-earth-engine

How to display changes in lake's surface area over time in a polygon bounded region, in a table in earth engine?

由 送分小仙女□ 提交于 2019-12-11 23:31:51
问题 The problem statement is that a region of interest is given. I need to find all the lakes in a polygon bounded region using the NDWI index for water bodies, which are at a height of more than 1500m. Then display the changes in the area of lake's surface water starting from the year 1984 till 2018 on a 2-year interval in a table like structure in Google Earth Engine. I have used Landsat 5 and 7 data. I need to display the results in the polygon marked region in a table sort of structure in the

Get results in an Earth Engine python script

由 ⅰ亾dé卋堺 提交于 2019-12-11 16:28:30
问题 I'm trying to get NDVI mean in every polygon in a feature collection with earth engine python API. I think that I succeeded getting the result (a feature collection in a feature collection), but then I don't know how to get data from it. The data I want is IDs from features and ndvi mean in each feature. import datetime import ee ee.Initialize() #Feature collection fc = ee.FeatureCollection("ft:1s57dkY_Sg_E_COTe3sy1tIR_U-5Gw-BQNwHh4Xel"); fc_filtered = fc.filter(ee.Filter.equals('NUM_DECS', 1

Collection.loadTable: not found in GEE

由 荒凉一梦 提交于 2019-12-11 08:54:10
问题 When I tried to upload my .shp file in Google Earth Engine Asset and import in Python like this: self.TS_POP = ee.FeatureCollection(users/arafayknysys/pop_TS) And when I tried to load the Geometric Data using self.TS_POP.getInfo() , I get the following error: Collection.loadTable: (*) not found Any help much appreciated 回答1: I have solved it by my self, Actually what I have done is after uploading my dataset in Google Earth Engine code editor. I forgot to give the read access to every one.

How to iterate over and download each image in an image collection from the Google Earth Engine python api

由 ￣綄美尐妖づ 提交于 2019-12-09 01:21:30
问题 I am new to google earth engine and was trying to understand how to use the Google Earth Engine python api. I can create an image collection, but apparently the getdownloadurl() method operates only on individual images. So I am trying to understand how to iterate over and download all of the images in the collection. Here is my basic code. I broke it out in great detail for some other work I am doing. import ee ee.Initialize() col = ee.ImageCollection('LANDSAT/LC08/C01/T1') col.filterDate('1

Aggregate GPM hourly data to daily in GEE

由 我只是一个虾纸丫 提交于 2019-12-08 01:55:13
问题 I need to aggregate the sum of 48 half hourly images per day of a GPM collection getting a imageCollection with the band "precipitationCal" and daily images I've trying to fill and iterate a empty featureCollection but I get a empty collection without images var dataset = ee.ImageCollection('NASA/GPM_L3/IMERG_V05') var startdate = ee.Date.fromYMD(2014,3,1) var enddate = ee.Date.fromYMD(2014,4,1) var precipitation = dataset.filter(ee.Filter.date(startdate,enddate)).select('precipitationCal')

how to download images using google earth engine's python API

由 我只是一个虾纸丫 提交于 2019-12-06 12:45:09
I am using Google's Earth Engine API to access LandSat images. The program is as given below, import ee ee.Initialize() Load a landsat image and select three bands. landsat = ee.Image('LANDSAT/LC8_L1T_TOA /LC81230322014135LGN00').select(['B4', 'B3', 'B2']); Create a geometry representing an export region. geometry = ee.Geometry.Rectangle([116.2621, 39.8412, 116.4849, 40.01236]); Export the image, specifying scale and region. export.image.toDrive({ image: landsat, description: 'imageToDriveExample', scale: 30, region: geometry }); it throws the following error. Traceback (most recent call last)

Double loop with map() function in Google Earth Engine

由 自古美人都是妖i 提交于 2019-12-04 02:11:32
问题 In Google Earth Engine Developer's Guide, there is a recommendation to avoid for() loops. They recommend to use map() function as this example: // to avoid var clientList = []; for(var i = 0; i < 8; i++) { clientList.push(i + 1); } print(clientList); // to use var serverList = ee.List.sequence(0, 7); serverList = serverList.map(function(n) { return ee.Number(n).add(1); }); print(serverList); I'm trying to select MODIS scenes from each month/year prior to compute VCI. So, the approach I'd take

Extract pixel values by points and convert to a table in Google Earth Engine

由 可紊 提交于 2019-12-03 22:07:05
I am undertaking a project that is relating field measurements of fire severity to band values and spectral indices derived from Landsat imagery before and after the fire. I am currently using Google Earth Engine to extract surface reflectance values from a collection of Landsat images. The approach I am using imports my field site locations (point data) as a feature collection and uses the getRegion function to extract band values from a Landsat image collection at each point. The code is provided below: //IMPORT SAMPLE POINTS var pts = ee.FeatureCollection('ft:1N9Hb01uCSHqGpz262K

HTTPException: invalid and/or missing SSL certificate for url: https://accounts.google.com/o/oauth2/token

由 牧云@^-^@ 提交于 2019-12-03 17:21:02
问题 When I call for the Google Earth Engine (GEE) Python APIs through Google AppEngine, it throws out a HTTPException which says " HTTPException: invalid and/or missing SSL certificate for url: https://accounts.google.com/o/oauth2/token ". The project runs well before the New Year's Holiday, but it suddenly broke out without any changes on my own codes when I tested it on yesterday. The detailed error information 回答1: I am also experiencing the same issue in my python script with App Engine. It

HTTPException: invalid and/or missing SSL certificate for url: https://accounts.google.com/o/oauth2/token

由 风格不统一 提交于 2019-12-03 06:20:17
When I call for the Google Earth Engine (GEE) Python APIs through Google AppEngine, it throws out a HTTPException which says " HTTPException: invalid and/or missing SSL certificate for url: https://accounts.google.com/o/oauth2/token ". The project runs well before the New Year's Holiday, but it suddenly broke out without any changes on my own codes when I tested it on yesterday. The detailed error information I am also experiencing the same issue in my python script with App Engine. It was running fine a few days ago and the certificate for accounts.google.com is valid until March, 9th 2017
订阅 google-earth-engine