u.s. department of the interior u.s. geological survey march 2014 lp daac modis data services jason...

U.S. Department of the InteriorU.S. Geological Survey

March 2014

LP DAAC MODIS Data ServicesJason Werpy1 , Chris Doescher2 , Chris Torbert2, Dave Meyer2

1Information Dynamics contractor to the U.S. Geological Survey (USGS) Earth Resources and Observation and Science (EROS) Center, Sioux Falls, SD, 2

USGS EROS

ORNL MODIS SubsetterThe ORNL (Oak Ridge National Laboratory) DAAC provides an interface that allows for users to subset certain MODIS data products. Users can specify a location, the number of pixels around that location to subset, and a selected timeframe for subsetting the MODIS data. The LP DAAC receives subset requests from ORNL for its products, creates subsets and forwards them to the ORNL DAAC for distribution to the MODIS subsetter users. (http://daac.ornl.gov/cgi-bin/MODIS/GLBVIZ_1_Glb/modis_subset_order_global_col5.pl)

Data Subsetting and Reformatting

Data Access

The LP DAAC provides a Web Services-enabled interface to its MODIS Reprojection Tool (MRT). The MRTWeb user interface allows LP DAAC users to select MODIS tiles for reprojection, subsetting, resampling, and mosaicking and executes those services on LP DAAC servers.

MRTWeb Services

Often, users of MODIS land products data from the LP DAAC are interested in areas that are much smaller in size than afforded by the data granules. In order to ease the burden of downloading several full tiles or swaths of MODIS data, the LP DAAC has deployed a number of MODIS data services to facilitate spatially subsetting the data to the user’s specifications. Also, given that users may only want certain bands of data, these services can also spectrally subset the MODIS data to return only the desired bands of interest. These services are also capable of reformatting the data to different map projections and/or formats in addition to also providing the ability to resample the data resolution. The MRTWeb Services are capable of mosaicking data as well. The Data Services deployed by the LP DAAC and other data providers offer efficient tools that allow users to streamline and optimize their workflow to get more processing done with less effort.

MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_b01,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_b01,-3,-3,3,4,9,7,10,5,7,7,3,11,10,6,7,5,3,3,4,8,9,2,5,11,11,5,3,…MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_b02,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_b02,-7,-7,-3,-2,2,-1,-1,0,1,1,-1,1,0,-2,2,-2,-4,-4,0,0,3,-4,-4,5,5,…MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_b03,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_b03,177,177,180,179,175,170,172,170,168,168,169,178,171,…MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_b04,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_b04,71,71,74,79,80,77,78,78,78,78,76,77,79,77,83,74,71,71,…MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_b05,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_b05,-42,-42,-43,-19,-42,-28,-51,-22,-37,-37,-20,-48,-33,-41,26,… MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_b06,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_b06,50,50,51,50,51,47,58,45,52,52,45,56,48,57,51,57,41,41,…MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_b07,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_b07,31,31,22,39,24,45,31,45,26,26,34,18,42,23,47,20,38,38,…MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_day_of_year,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_day_of_year,66,66,66,66,66,66,66,66,66,66,66,66,66,…MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_qc_500m,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_qc_500m,1077150581,1077150581,1077150529,…MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_raz,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_raz,12861,12861,12861,12861,12862,12862,12863,12863,…MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_state_500m,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_state_500m,120,120,120,120,120,120,120,120,120,…MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_szen,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_szen,3994,3994,3993,3993,3992,3992,3992,3992,3991,3991,…MOD09A1.A2004065.h17v06.005.2007255085450.sur_refl_vzen,MOD09A1,A2004065,Lat29.997917Lon-11.544357Samp21Line21,2007255085450,sur_refl_vzen,1154,1154,1163,1163,1172,1172,1181,1181,1190,1190,…

Data Services

Dataset: MOD09Q1.005., 4096, 3558, 3558, 3416, 3850, 3056, 3056, 4416sur_refl_b01[0][6], 4093, 4093, 3332, 3332, 3204, 3204, 4758, 3786, 5392, 5392sur_refl_b01[0][7], 4905, 2846, 3330, 3657, 3657, 5018, 5018, 5662, 5676, 5850sur_refl_b01[0][8], 3312, 3312, 4577, 4220, 5030, 5030, 5679, 5679, 5791, 5940sur_refl_b01[0][9], 3999, 4108, 4108, 4479, 4479, 5685, 5685, 5538, 5538, 5622sur_refl_b01[1][0], 907, 752, 844, 814, 574, 546, 618, 853, 1059, 1079sur_refl_b01[1][1], 742, 685, 681, 656, 566, 835, 1012, 984, 1015, 1033sur_refl_b01[1][2], 792, 715, 656, 649, 813, 906, 847, 981, 1015, 783sur_refl_b01[1][3], 715, 663, 689, 584, 644, 715, 981, 775, 779, 774sur_refl_b01[1][4], 625, 577, 612, 787, 715, 909, 731, 603, 697, 834sur_refl_b01[1][5], 697, 879, 787, 814, 942, 870, 673, 782, 838, 1140sur_refl_b01[1][6], 877, 879, 872, 1034, 1005, 725, 792, 838, 951, 1003sur_refl_b01[1][7], 916, 970, 879, 665, 676, 792, 928, 773, 912, 1050sur_refl_b01[1][8], 996, 880, 833, 1054, 676, 830, 1106, 1191, 1129, 1217sur_refl_b01[1][9], 830, 814, 979, 1040, 1101, 1061, 1076, 1097, 1146, 1149sur_refl_b01[2][0], 1322, 1125, 1359, 1349, 966, 894, 954, 1091, 1258, 1275sur_refl_b01[2][1], 1125, 1115, 1121, 1008, 894, 1071, 1195, 1184, 1184, 1191sur_refl_b01[2][2], 1180, 1067, 1008, 925, 1056, 1143, 1121, 1217, 1188, 956sur_refl_b01[2][3], 1067, 971, 912, 871, 947, 1067, 1236, 1217, 963, 1000sur_refl_b01[2][4], 950, 845, 966, 1259, 1367, 1236, 886, 745, 793, 939sur_refl_b01[2][5], 1293, 1475, 1475, 1367, 1391, 1022, 759, 885, 925, 1194sur_refl_b01[2][6], 1350, 1475, 1362, 1386, 1109, 820, 942, 1004, 1248, 1260sur_refl_b01[2][7], 1350, 1319, 1314, 1054, 748, 792, 1004, 895, 1166, 1187sur_refl_b01[2][8], 1423, 1015, 1003, 1119, 792, 1011, 1358, 1491, 1389, 1291sur_refl_b01[2][9], 1128, 1010, 1199, 1119, 1159, 1273, 1280, 1306, 1254, 1353sur_refl_b01[0][0], 4144, 4570, 4570, 3031, 3352, 3352, 3352, 4705, 4705, 5857sur_refl_b01[0][1], 4144, 2914, 2914, 4033, 4033, 5064, 5064, 5119, 5119, 6149sur_refl_b01[0][2], 3634, 3634, 4496, 4496, 5576, 5576, 5689, 5689, 6441, 6364sur_refl_b01[0][3], 3927, 4867, 4939, 5216, 5216, 5120, 5120, 5410, 5410, 4444sur_refl_b01[0][4], 4250, 4250, 4067, 4067, 4491, 4491, 4742, 4742, 3109, 3109sur_refl_b01[0][5], 4364, 4096

Applications that are aware of the OPeNDAP communications standards can easily integrate OPeNDAP data access to their users. One example of this is the Geo Data Portal (http://cida.usgs.gov/gdp/client/?development=true)

from CIDA (Center for Integrated Data Analytics).

Common Service Actions

• Reprojection• Band Subsetting• Spatial Subsetting• Temporal Subsetting• Mosaicking• Resampling

MRTSwath Web Services

ORNL MODIS Subsetter Submission Form

ORNL MODIS Subsetter Results

OPeNDAP Interface

ORNL MODIS Subsetter Interface

OPeNDAP Results

OPeNDAP Client InterfaceCIDA Geo Data Portal

In order to facilitate the MODIS swath-based products, the LP DAAC has recently deployed services based on its MRTSwath Tool. These services are being made available via REST-based HTTP calls using the MRTSwath Web Services interface.

Mosaic,Reproject,Resample

http://mrtwebsvc.cr.usgs.gov/MRTWebProcessor/resources/esiMrtswath?FILE_URLS=ftp://ladsweb.nascom.nasa.gov/allData/5/MOD09/2014/050/MOD09.A2014050.1650.005.2014056234655.hdf& FORMAT=GEOTIFF_FMT&EMAIL=user@mailaddress.com&SUBSET_DATA_LAYERS='500m Surface Reflectance Band 1’ &PROJECTION=GEOGRAPHIC

Reproject,Resample,

Subset

MRTSwath Web Service Call

MRTWeb Interface

OPeNDAP OPenDAP (Open-source Project for a Network Data Access Protocol) is a data transport architecture and protocol based on the Hypertext Transfer Protocol (HTTP). The LP DAAC is providing OPeNDAP services (as part of a pilot project) to some users to allow them to select and subset data from the LP DAAC MODIS product collections. OPeNDAP can organize (aggregate) the data into time series that enables users to select data subsets across different observation dates. OPeNDAP also allows users to output data in different user-selectable formats (ASCII, netCDF, DODS).

LP DAAC MODIS Data Services facilitate the algorithms to archives paradigm by providing quick and efficient access to data products, saving users time and effort.