|
| EDG Data Set Name |
Granule Shortname |
| MODIS/Aqua Observation Pointers Daily L2G Global 250m SIN Grid |
MYDPTQKM |
| Version |
Acquisition Range |
Science Quality Status |
| V003 |
March 6 2003 (2003065) - February 1 2004 (2004032) |
Validated |
| V004 |
July 4 2002 (2002185) |
Validated |
|
Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 2 (4800x4800 row/column)
Average File Size = 290 MB
Resolution = 250 meters
Projection = Sinusoidal
Processing Level = 2G
Data Format = HDF-EOS
Science Data Sets (SDSs) = 7
Product Description
The MODIS Level 2 Gridded (L2G) land data storage methodology was developed to
satisfy the diverse needs of the MODIS land product generation algorithms, to
enable efficient processing and reprocessing of MODIS land products, to
facilitate the development of terrestrial remote sensing algorithms and science
using MODIS land data, and to provide users with the original sensed MODIS
observations and their sub-pixel geolocation information.
|
| Color |
Observation Coverage |
| White |
0 to 10% |
| Maroon |
11 to 20% |
| Magenta |
21 to 30% |
| Purple |
31 to 40% |
| Cyan |
41 to 50% |
| Blue |
51 to 60% |
| Green |
61 to 70% |
| Yellow |
71 to 80% |
| Orange |
81 to 90% |
| Red |
91 to 100% |
| Black |
Fill |
| Color |
Number of Observations |
| Black |
0 |
| Green |
1 |
| Blue |
2 |
| Red |
3 |
| Yellow |
4 |
| Magenta |
5 |
| Maroon |
6 |
|
|
The L2G data structure
stores information concerning the Level 2 (L2) observations that fall within
each Level 3 (L3) grid cell over a 24 hour (GMT) period. The observation
coverage, the area of the intersection of the observation and each overlapping
grid cell in the tile, is computed and stored. The above images represent
day-mode L2G information acquired over the western coast of North America on
July 11, 2003. The first image is of the observation coverage and the second
contains the number of observations per pixel. The original 250-m L2 product line and sample numbers
of each observation are included. Offsets
are provided to the corresponding observation in the coarser 500-km L2G files (MYDPTHKM,
etc.) to allow 250-m products to be generated using information from the coarser
resolutions. The observations stored in the L2G products are examined by the L3
processes to extract the most relevant observations falling over each grid cell.
NOTE: These products are validated,
meaning that product uncertainties are well defined over a range of
representative conditions. Although there may be later improved versions, these
data are ready for use in scientific publications.
| SDS |
Units |
Data Type -bit |
Fill Value |
Valid Range |
Multiply by
Scaling Factor |
Calibrated
_nt |
| Number of Observations |
na |
8-bit signed integer |
-1 |
0 - 127 |
na |
na |
| Observation coverage |
% |
8-bit signed integer |
-1 |
0 - 100 |
0.01 |
5 |
| Granule pointer |
na |
8-bit unsigned integer |
255 |
0 - 254 |
na |
na |
| Observation line number |
na |
16-bit unsigned integer |
65535 |
0 - ~4800 |
na |
na |
| Observation sample number |
na |
16-bit unsigned integer |
65535 |
0 - ~4800 |
na |
na |
| row and column offset in coarser grid |
na |
8-bit unsigned integer |
136 |
0 - 255 |
na |
na |
observation number in
coarser grid |
na |
8-bit unsigned integer |
255 |
0 - 254 |
na |
na |
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View .pdf version 
Order Data through the EOS Data Gateway
( http://edcimswww.cr.usgs.gov/pub/imswelcome/)
EOS Data Gateway Search Tips
| Source: |
Aqua |
| Sensor: |
MODIS |
| Dataset: |
MODIS/Aqua Observation Pointers Daily L2G Global 250m SIN Grid |
| Spatial: |
HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min |
| Geographic Extent: |
Type Lat/Long Range or Draw on Map |
| Temporal Extent: |
2003-03-06 to 2004-02-01 (V003); 2002-07-04 to present (V004) |
Product Information
Contact Information
|
