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1
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// MODIS LAND Observation Frequency
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2
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3
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// Proportion of days in the month with at least 1 MODIS observation
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4
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var p_07 = ee.ImageCollection("MOD09GA").
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5
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filter(ee.Filter.calendarRange(2011,2012,"year")).
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6
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filter(ee.Filter.calendarRange(7,7,"month")).map(function(img) {
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7
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return img.select(['num_observations_1km']).gte(1)}).mean().multiply(ee.Image(100)).select([0],["p07"]);
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8
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9
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// mean number of observations per day
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10
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var n_07 = ee.ImageCollection("MOD09GA").
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11
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filter(ee.Filter.calendarRange(2011,2012,"year")).
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12
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filter(ee.Filter.calendarRange(7,7,"month")).map(function(img) {
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13
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return img.select(['num_observations_1km'])}).mean().select([0],["n07"]);
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14
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15
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var n_12 = ee.ImageCollection("MOD09GA").
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16
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filter(ee.Filter.calendarRange(2011,2012,"year")).
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17
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filter(ee.Filter.calendarRange(12,12,"month")).map(function(img) {
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18
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return img.select(['num_observations_1km']).gte(1)}).mean().multiply(ee.Image(100)).select([0],["p12"]);
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19
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|
|
20
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// mean number of observations per day
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|
21
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var p_12 = ee.ImageCollection("MOD09GA").
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22
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filter(ee.Filter.calendarRange(2011,2012,"year")).
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23
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filter(ee.Filter.calendarRange(12,12,"month")).map(function(img) {
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24
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return img.select(['num_observations_1km'])}).mean().select([0],["n12"]);
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25
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26
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// Combine anything into image for download
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27
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var image=n_07.addBands(p_07).addBands(n_12).addBands(p_12)
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28
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//var reproj = image.reproject('EPSG:4326', [0.008333333333, 0, -180, 0, -0.008333333333, -90])
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29
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30
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//var palette="000000,00FF00,FF0000"
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31
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//addToMap(image.select([0]),{min:0,max:100,palette:palette},"July");
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32
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//addToMap(n_12,{min:0,max:100,palette:palette},"Decenber");
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33
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34
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35
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var driveFolder="EarthEngineOutput"
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36
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37
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exportImage(image,
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38
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'PObs',
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39
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{'name': 'PObs',
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40
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'maxPixels':1000000000,
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41
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'driveFolder':driveFolder,
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42
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'crs': 'EPSG:4326', //4326
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43
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'crsTransform':[0.008333333333, 0, -180, 0, -0.008333333333, -90],
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44
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// 'scale': 0.008333333333,
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45
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'region': '[[-180, -89], [-180, 89], [180, 89], [180, -89]]' //global
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46
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// 'region': '[[-180, 0], [-180, 10], [180, 10], [180, 0]]' //
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47
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});
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