3
<em>i.modis.qc</em> extracts Requested Quality Assessment flags from the
4
following MODIS products: MOD09A1, MOD09Q1, MOD11A1, MOD11A2, MOD13A2,
5
MCD43B2. This does include MOD09A1 QA_state_500m layer (see Notes).
8
<em>MOD09A1/Q1: MODLAND QA Bits. bits=[0-1]</em>
11
<li>[00]= class 0: Corrected product produced at ideal quality -- all bands</li>
12
<li>[01]= class 1: Corrected product produced at less than ideal quality -- some or all bands</li>
13
<li>[10]= class 2: Corrected product NOT produced due to cloud effect -- all bands</li>
14
<li>[11]= class 3: Corrected product NOT produced due to other reasons --
15
some or all bands maybe be fill value (Note that a value of [11] overrides a value of [01])</li>
19
<em>MOD09Q1: Cloud State. bits=[2-3] </em>
22
<li>[00]= class 0: Clear -- No clouds</li>
23
<li>[01]= class 1: Cloudy</li>
24
<li>[10]= class 2: Mixed</li>
25
<li>[11]= class 3: Not Set ; Assumed Clear</li>
29
<em>MOD09Q1: Band-wise Data Quality 250m bits=[4-7][8-11]</em>
30
<em>MOD09A1: Band-wise Data Quality 500m bits=[2-5][6-9][10-13][14-17][18-21][22-25][26-29]</em>
33
<li>[0000]= class 0: highest quality</li>
34
<li>[0111]= class 1: noisy detector</li>
35
<li>[1000]= class 2: dead detector; data interpolated in L1B</li>
36
<li>[1001]= class 3: solar zenith ≥ 86 degrees</li>
37
<li>[1010]= class 4: solar zenith ≥ 85 and < 86 degrees</li>
38
<li>[1011]= class 5: missing input</li>
39
<li>[1100]= class 6: internal constant used in place of climatological data for at least one atmospheric constant</li>
40
<li>[1101]= class 7: correction out of bounds, pixel constrained to extreme allowable value</li>
41
<li>[1110]= class 8: L1B data faulty</li>
42
<li>[1111]= class 9: not processed due to deep ocean or cloud</li>
43
<li>Class 10-15: Combination of bits unused</li>
47
<em>MOD09A1/Q1: Atmospheric correction bit=[12]/[30]</em>
50
<li>[0]= class 0: Not Corrected product</li>
51
<li>[1]= class 1: Corrected product</li>
55
<em>MOD09A1/Q1: Adjacency correction bit=[13]/[31]</em>
58
<li>[0]= class 0: Not Corrected product</li>
59
<li>[1]= class 1: Corrected product</li>
63
<em>MOD09Q1: Different orbit from 500m product, bit=[14]</em>
66
<li>[0]= class 0: same orbit as 500m</li>
67
<li>[1]= class 1: different orbit from 500m</li>
71
<em>MOD11A1: Mandatory QA Flags bits=[0-1]</em>
74
<li>[00]= class 0: LST produced, good quality, not necessary to examine more detailed QA</li>
75
<li>[01]= class 1: LST produced, other quality, recommend examination of more detailed QA</li>
76
<li>[10]= class 2: LST not produced due to cloud effects</li>
77
<li>[11]= class 3: LST not produced primarily due to reasons other than cloud</li>
81
<em>MOD11A1: Data Quality Flag bits=[2-3]</em>
84
<li>[00]= class 0: Good data quality of L1B in bands 31 and 32</li>
85
<li>[01]= class 1: Other quality data</li>
86
<li>[10]= class 2: TBD</li>
87
<li>[11]= class 3: TBD</li>
91
<em>MOD11A1: Emis Error Flag bits=[4-5]</em>
94
<li>[00]= class 0: Average emissivity error ≤ 0.01</li>
95
<li>[01]= class 1: Average emissivity error ≤ 0.02</li>
96
<li>[10]= class 2: Average emissivity error ≤ 0.04</li>
97
<li>[11]= class 3: Average emissivity error > 0.04</li>
101
<em>MOD11A1: LST Error Flag bits=[6-7]</em>
104
<li>[00]= class 0: Average LST error ≤ 1</li>
105
<li>[01]= class 1: Average LST error ≤ 2</li>
106
<li>[10]= class 2: Average LST error ≤ 3</li>
107
<li>[11]= class 3: Average LST error > 3</li>
111
<em>MOD11A2: Mandatory QA Flags bits=[0-1]</em>
114
<li>[00]= class 0: LST produced, good quality, not necessary to examine more detailed QA</li>
115
<li>[01]= class 1: LST produced, other quality, recommend examination of more detailed QA</li>
116
<li>[10]= class 2: LST not produced due to cloud effects</li>
117
<li>[11]= class 3: LST not produced primarily due to reasons other than cloud</li>
121
<em>MOD11A2: Data Quality Flag bits=[2-3]</em>
124
<li>[00]= class 0: Good data quality of L1B in 7 TIR bands</li>
125
<li>[01]= class 1: Other quality data</li>
126
<li>[10]= class 2: TBD</li>
127
<li>[11]= class 3: TBD</li>
131
<em>MOD11A2: Emis Error Flag bits=[4-5]</em>
134
<li>[00]= class 0: Average emissivity error ≤ 0.01</li>
135
<li>[01]= class 1: Average emissivity error ≤ 0.02</li>
136
<li>[10]= class 2: Average emissivity error ≤ 0.04</li>
137
<li>[11]= class 3: Average emissivity error > 0.04</li>
141
<em>MOD11A2: LST Error Flag bits=[6-7]</em>
144
<li>[00]= class 0: Average LST error ≤ 1</li>
145
<li>[01]= class 1: Average LST error ≤ 2</li>
146
<li>[10]= class 2: Average LST error ≤ 3</li>
147
<li>[11]= class 3: Average LST error > 3</li>
151
<em>MOD09A1s: Cloud State bits=[0-1]</em>
154
<li>[00]= class 0: clear</li>
155
<li>[01]= class 1: cloudy</li>
156
<li>[10]= class 2: mixed</li>
157
<li>[11]= class 3: not set, assumed clear</li>
161
<em>MOD09A1s: Cloud shadow bits=[2]</em>
164
<li>[0]= class 0: no</li>
165
<li>[1]= class 1: yes</li>
169
<em>MOD09A1s: Land/Water Flag bits=[3-5]</em>
172
<li>[000]= class 0: Shallow ocean</li>
173
<li>[001]= class 1: Land</li>
174
<li>[010]= class 2: Ocean coastlines and lake shorelines</li>
175
<li>[011]= class 3: Shallow inland water</li>
176
<li>[100]= class 4: Ephemeral water</li>
177
<li>[101]= class 5: Deep inland water</li>
178
<li>[110]= class 6: Continental/moderate ocean</li>
179
<li>[111]= class 7: Deep ocean</li>
183
<em>MOD09A1s: Aerosol Quantity bits=[6-7]</em>
186
<li>[00]= class 0: Climatology</li>
187
<li>[01]= class 1: Low</li>
188
<li>[10]= class 2: Average</li>
189
<li>[11]= class 3: High</li>
193
<em>MOD09A1s: Cirrus detected bits=[8-9]</em>
196
<li>[00]= class 0: None</li>
197
<li>[01]= class 1: Small</li>
198
<li>[10]= class 2: Average</li>
199
<li>[11]= class 3: High</li>
203
<em>MOD09A1s: Internal Cloud Algorithm Flag bits=[10]</em>
206
<li>[0]= class 0: No cloud</li>
207
<li>[1]= class 1: Cloud</li>
211
<em>MOD09A1s: Internal Fire Algorithm Flag bits=[11]</em>
214
<li>[0]= class 0: No fire</li>
215
<li>[1]= class 1: Fire</li>
219
<em>MOD09A1s: MOD35 snow/ice flag bits=[12]</em>
222
<li>[0]= class 0: No</li>
223
<li>[1]= class 1: Yes</li>
227
<em>MOD09A1s: Pixel adjacent to cloud bits=[13]</em>
230
<li>[0]= class 0: No</li>
231
<li>[1]= class 1: Yes</li>
235
<em>MOD09A1s: BRDF correction performed bits=[14]</em>
238
<li>[0]= class 0: No</li>
239
<li>[1]= class 1: Yes</li>
243
<em>MOD09A1s: Internal Snow Mask bits=[15]</em>
246
<li>[0]= class 0: No snow</li>
247
<li>[1]= class 1: Snow</li>
251
<em>MOD13A2: Mandatory QA Flags 1km bits[0-1]</em>
254
<li>[00]= class 0: VI produced, good quality</li>
255
<li>[01]= class 1: VI produced, but check other QA</li>
256
<li>[10]= class 2: Pixel produced, but most probably cloud</li>
257
<li>[11]= class 3: Pixel not produced due to other reasons than clouds</li>
261
<em>MOD13A2: VI Usefulness Flag bits[2-5]</em>
264
<li>[0000]= class 0: Highest quality</li>
265
<li>[0001]= class 1: Lower quality</li>
266
<li>[0010]= class 2: Decreasing quality</li>
267
<li>[0100]= class 3: Decreasing quality</li>
268
<li>[1000]= class 4: Decreasing quality</li>
269
<li>[1001]= class 5: Decreasing quality</li>
270
<li>[1010]= class 6: Decreasing quality</li>
271
<li>[1100]= class 7: Lowest quality</li>
272
<li>[1101]= class 8: Quality so low that it is not useful</li>
273
<li>[1110]= class 9: L1B data faulty</li>
274
<li>[1111]= class 10: Not useful for any other reason/not processed</li>
278
<em>MOD13A2: Aerosol quantity Flags 1km bits[6-7]</em>
281
<li>[00]= class 0: Climatology</li>
282
<li>[01]= class 1: Low</li>
283
<li>[10]= class 2: Average</li>
284
<li>[11]= class 3: High</li>
288
<em>MOD13A2: Adjacent cloud detected 1km bit[8]</em>
291
<li>[00]= class 0: No</li>
292
<li>[01]= class 1: Yes</li>
296
<em>MOD13A2: Atmosphere BRDF correction performed 1km bit[9]</em>
299
<li>[00]= class 0: No</li>
300
<li>[01]= class 1: Yes</li>
304
<em>MOD13A2: Mixed clouds 1km bit[10]</em>
307
<li>[00]= class 0: No</li>
308
<li>[01]= class 1: Yes</li>
312
<em>MOD13A2: Land/Water Flags 1km bits[11-13]</em>
315
<li>[000]= class 0: Shallow Ocean</li>
316
<li>[001]= class 1: Land (Nothing else but land)</li>
317
<li>[010]= class 2: Ocean Coastlines and lake shorelines</li>
318
<li>[011]= class 3: Shallow inland water</li>
319
<li>[100]= class 4: Ephemeral water</li>
320
<li>[101]= class 5: Deep inland water</li>
321
<li>[110]= class 6: Moderate or continental ocean</li>
322
<li>[111]= class 7: Deep ocean</li>
326
<em>MOD13A2: Possible Snow/Ice 1km bits[14]</em>
329
<li>[0]= class 0: No</li>
330
<li>[1]= class 1: Yes</li>
334
<em>MOD13A2: Possible Shadow 1km bits[15]</em>
337
<li>[0]= class 0: No</li>
338
<li>[1]= class 1: Yes</li>
343
<em>MCD43B2: Albedo Quality Ancillary Platform Data 1km bits[0-3]</em>
344
<em>SDS: BRDF_Albedo_Ancillary</em>
347
<li>[0000]= class 0: Satellite Platform: Terra</li>
348
<li>[0001]= class 1: Satellite Platform: Terrra/Aqua</li>
349
<li>[0010]= class 2: Satellite Platform: Aqua</li>
350
<li>[1111]= class 15: Fill Value</li>
351
<li>Classes 3-14: Not used</li>
355
<em>MCD43B2: Albedo Quality Ancillary Land/Water Data 1km bits[4-7]</em>
356
<em>SDS: BRDF_Albedo_Ancillary</em>
359
<li>[0000] class 0: Shallow Ocean</li>
360
<li>[0001] class 1: Land (Nothing else but land)</li>
361
<li>[0010] class 2: Ocean and lake shorelines</li>
362
<li>[0011] class 3: Shallow inland water</li>
363
<li>[0100] class 4: Ephemeral water</li>
364
<li>[0101] class 5: Deep inland water</li>
365
<li>[0110] class 6: Moderate or continental ocean</li>
366
<li>[0111] class 7: Deep ocean</li>
367
<li>[1111] class 15: Fill Value</li>
368
<li>Classes 8-14: Not used</li>
372
<em>MCD43B2: Albedo Quality Ancillary Sun Zenith Angle at Local Solar Noon Data 1km bits[8-14]</em>
373
<em>SDS: BRDF_Albedo_Ancillary</em>
376
Returns integer value [0-90], 127 is Fill Value
381
<em>MCD43B2: Band-wise Albedo Quality Data 1km</em>
382
<em>SDS: BRDF_Albedo_Band_Quality</em>
384
bits[0-3][4-7][8-11][12-15][16-19][20-23][24-27]<br>
386
<li>[0000]= class 0: best quality, 75% or more with best full inversions</li>
387
<li>[0001]= class 1: good quality, 75% or more with full inversions</li>
388
<li>[0010]= class 2: Mixed, 50% or less full inversions and 25% or less fill values</li>
389
<li>[0011]= class 3: All magnitude inversions or 50% or less fill values</li>
390
<li>[0100]= class 4: 75% or more fill values</li>
391
<li>Classes 5-14: Not Used</li>
392
<li>[1111]= class 15: Fill Value</li>
397
In MOD09A1: It seems that cloud related info is not filled properly in the
398
standard QC (MOD09A1 in this module) since version 3, State-QA 500m images
399
(MOD09A1s in this module) should be used (see Vermote et al., 2008).
402
Add more daily products.
407
<a href="i.vi.html">i.vi</a>
413
<li> <a href="https://lpdaac.usgs.gov/products/modis_products_table">MODIS Products</a>
414
<li> Vermote E.F., Kotchenova S.Y., Ray J.P. MODIS Surface Reflectance User's Guide.
415
Version 1.2. June 2008. MODIS Land Surface Reflectance Science Computing Facility.
416
<a href="http://modis-sr.ltdri.org">Homepage</a>
423
<i>Last changed: $Date: 2014-12-12 00:16:30 +0100 (Fri, 12 Dec 2014) $</i>