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f5ef0596
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Adam M. Wilson
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#!/usr/bin/env python
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58d05081
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Adam M. Wilson
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## Example script that downloads data from Google Earth Engine using the python API
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## MODIS MOD09GA data is processed to extract the MOD09 cloud flag and calculate monthly cloud frequency
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## import some libraries
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import ee
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from ee import mapclient
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import ee.mapclient
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import datetime
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import wget
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import os
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f5ef0596
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Adam M. Wilson
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import sys
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15936a3e
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Adam M. Wilson
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from subprocess import call
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58d05081
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Adam M. Wilson
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f5ef0596
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Adam M. Wilson
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import logging
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logging.basicConfig(filename='error.log',level=logging.DEBUG)
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def Usage():
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print('Usage: ee.MOD9.py -projwin ulx uly lrx lry -year year -month month -regionname 1')
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sys.exit( 1 )
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ulx = float(sys.argv[2])
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uly = float(sys.argv[3])
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lrx = float(sys.argv[4])
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lry = float(sys.argv[5])
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year = int(sys.argv[7])
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month = int(sys.argv[9])
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regionname = str(sys.argv[11])
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#```
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#ulx=-159
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#uly=20
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#lrx=-154.5
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#lry=18.5
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#year=2001
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#month=6
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#```
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## Define output filename
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output=regionname+'_'+str(year)+'_'+str(month)
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58d05081
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Adam M. Wilson
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## set working directory (where files will be downloaded)
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d7dc526e
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Adam M. Wilson
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os.chdir('/mnt/data2/projects/cloud/mod09')
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58d05081
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Adam M. Wilson
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15936a3e
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Adam M. Wilson
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MY_SERVICE_ACCOUNT = '511722844190@developer.gserviceaccount.com' # replace with your service account
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MY_PRIVATE_KEY_FILE = '/home/adamw/EarthEngine-privatekey.p12' # replace with you private key file path
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58d05081
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Adam M. Wilson
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ee.Initialize(ee.ServiceAccountCredentials(MY_SERVICE_ACCOUNT, MY_PRIVATE_KEY_FILE))
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## set map center to speed up viewing
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Adam M. Wilson
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#ee.mapclient.centerMap(-121.767, 46.852, 11)
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58d05081
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Adam M. Wilson
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#///////////////////////////////////
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#// Function to extract cloud flags
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bce95cb5
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Adam M. Wilson
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def getmod09(img): return(img.select(['state_1km']).expression("((b(0)/1024)%2)>0.5"));
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# added the >0.5 because some values are coming out >1. Need to look into this further as they should be bounded 0-1...
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58d05081
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Adam M. Wilson
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#////////////////////////////////////////////////////
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# output filename
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f5ef0596
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Adam M. Wilson
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unzippedfilename=output+".mod09.tif"
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Adam M. Wilson
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# Check if file already exists and continue if so...
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Adam M. Wilson
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if(os.path.exists(unzippedfilename)):
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sys.exit("File exists:"+output)
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Adam M. Wilson
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f5ef0596
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Adam M. Wilson
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#####################################################
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# Processing Function
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# MOD09 internal cloud flag for this year-month
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15936a3e
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Adam M. Wilson
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# to filter by a date range: filterDate(datetime.datetime(yearstart,monthstart,1),datetime.datetime(yearstop,monthstop,31))
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f5ef0596
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Adam M. Wilson
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mod09 = ee.ImageCollection("MOD09GA").filter(ee.Filter.calendarRange(year,year,"year")).filter(ee.Filter.calendarRange(month,month,"month")).map(getmod09);
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d7dc526e
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Adam M. Wilson
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# myd09 = ee.ImageCollection("MYD09GA").filter(ee.Filter.calendarRange(year,year,"year")).filter(ee.Filter.calendarRange(month,month,"month")).map(getmod09);
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15936a3e
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Adam M. Wilson
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# calculate mean cloudiness (%), rename band, multiply by 100, and convert to integer
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f5ef0596
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Adam M. Wilson
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mod09a=mod09.mean().select([0], ['mod09']).multiply(ee.Image(1000)).int16();
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# myd09a=myd09.mean().select([0], ['MYD09_'+str(year)+'_'+str(month)]).multiply(ee.Image(100)).int8();
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## Set data equal to whatver you want downloaded
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data=mod09a
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######################################################
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## define region for download
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region=[ulx,lry], [ulx, uly], [lrx, uly], [lrx, lry] #h11v08
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strregion=str(list(region))
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d7dc526e
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Adam M. Wilson
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# Next few lines for testing only
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# print info to confirm there is data
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f5ef0596
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Adam M. Wilson
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#data.getInfo()
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## print a status update
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print(output+' Processing.... Coords:'+strregion)
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Adam M. Wilson
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# add to plot to confirm it's working
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Adam M. Wilson
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#ee.mapclient.addToMap(data, {'range': '0,100'}, 'MOD09')
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#```
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# TODO:
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# use MODIS projection
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15936a3e
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Adam M. Wilson
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# build the URL and name the object (so that when it's unzipped we know what it is!)
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f5ef0596
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Adam M. Wilson
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path =mod09a.getDownloadUrl({
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'name': output, # name the file (otherwise it will be a uninterpretable hash)
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'scale': 926, # resolution in meters
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'crs': 'EPSG:4326', # projection
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'region': strregion # region defined above
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});
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15936a3e
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Adam M. Wilson
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# Sometimes EE will serve a corrupt zipped file with no error
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# to check this, use a while loop that keeps going till there is an unzippable file.
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# This has the potential for an infinite loop...
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f5ef0596
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Adam M. Wilson
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#if(not(os.path.exists(output+".tif"))):
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# download with wget
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print("Downloading "+output)
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wget.download(path)
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#call(["wget"+path,shell=T])
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15936a3e
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Adam M. Wilson
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# try to unzip it
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f5ef0596
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Adam M. Wilson
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print("Unzipping "+output)
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zipstatus=call("unzip "+output+".zip",shell=True)
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d7dc526e
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Adam M. Wilson
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# if file doesn't exists or it didn't unzip, remove it and try again
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f5ef0596
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Adam M. Wilson
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if(zipstatus==9):
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sys.exit("File exists:"+output)
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# print("ERROR: "+output+" unzip-able")
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# os.remove(output+".zip")
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## delete the zipped file (the unzipped version is kept)
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os.remove(output+".zip")
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print(output+' Finished!')
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58d05081
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Adam M. Wilson
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