LP DAAC Big Earth Data Initiative BEDI Developed

LP DAAC Big Earth Data Initiative (BEDI) Developed Web Services Jason Werpy LP DAACEnterprise Architect SGT, Inc. , Contractor to the USGS EROS Center *Work performed under USGS contract G 15 PD 00766 U. S. Department of the Interior U. S. Geological Survey 1

NASA’s LP DAAC § Land Processes (LP) Distributed Active Archive Center (DAAC) § § https: //lpdaac. usgs. gov Located in Sioux Falls, SD at the USGS Earth Resources Observation Science (EROS) Center 2

LP DAAC Surface Reflectance, Land Cover, Vegetation Indices

Big Earth Data Initiative § NASA’s BEDI efforts § Increase accessibility of Earth Science Data § Increase availability of Earth Science Data § Increase usability of Earth Science Data 4

BEDI – LP DAAC Response § The LP DAAC decided that to address the BEDI goals, we would work on services designed and architected to give users improved data visibility, access, and tools. 5

BEDI – LP DAAC Response § Tiered Concept § LP DAAC created a tiered approach to data access UI API Middleware Data Services 6

A Quick Aside – Getting data § Why HTTP services? § § § Simple Standard bases protocol Securable Dynamic interaction methods (get/post, etc. ) Stream based data delivery § It’s even… 7

A Quick Aside – Getting data § Shown as a good way to get data in the ‘future’… 8

BEDI – LP DAAC Response § Data Access methods § OPe. NDAP - Open-source Project for a Network Data Access Protocol. Provides a direct way of subsetting LP DAAC data from our Data Pool. UI API Middleware Data Services 9

BEDI – LP DAAC Response § Middleware Web Services § § § Tilemap – Coverts Latitude and Longitude values into tile and pixel values for datasets located on a common grid structure. Fromjulian – Converts dates from a Julian date format to a mmdd-yyyy format. Tojulian – Converts dates from a mm-dd-yyyy format to a Julian date format of the number of days since 01 -01 -2000. Product (coming soon!) – Service that provides information about the different products available from the LP DAAC. Inventory – Service that returns information about the granules in the LP DAAC inventory. Powered by NASA Common Metadata Repository (CMR). UI API Middleware Data Services 10

BEDI – LP DAAC Response § Interface § App. EEARS – Interface for selecting point based data from the LP DAAC archive, analyzing that data, and downloading the specific values desired. API UI Middleware Data Services 11

OPe. NDAP Data Access § OPe. NDAP was a key component of NASA’s BEDI efforts § OPe. NDAP access to the LP DAAC’s Data Pool provides information about singular data granules. § Because MODIS tiles (and WELD tiles) are stored in a uniform grid of tiled data, the LP DAAC was able to create Aggregations by date. This allows an extra parameter that selects data from the date desired. § LP DAAC OPe. NDAP Services § http: //opendap. cr. usgs. gov/opendap/hyrax UI API Middleware Data Services 12

OPe. NDAP Data Access UI API Middleware Data Services 13

OPe. NDAP Data Access UI API Middleware Data Services 14

OPe. NDAP Data Access UI API Middleware Data Services 15

OPe. NDAP Data Access § Access and extract discrete subsets üSpatial üBand/Layers üTemporal (from aggregation) § Request data via URL http: //opendap. cr. usgs. gov/opendap/hyrax/MOD 09 Q 1. 005/h 11 v 04. ncm l. ascii? sur_refl_b 01[683: 1: 683][2000: 1: 2010] § Returns data that the user intends to use! § Reduces time spent downloading and processing § Minimizes the amount of data downloaded UI API Middleware Data Services 16

OPe. NDAP Data Access OPe. NDAP request: http: //opendap. cr. usgs. gov/opendap/hyrax/MOD 09 Q 1. 005/h 11 v 04. ncml. ascii? sur_refl_b 0 1[683: 1: 683][2000: 1: 2010] Return: Dataset: h 11 v 04. ncml sur_refl_b 01[0][0], 0. 5359, 0. 5657, 0. 5258, 0. 4739, 0. 4648, 0. 5087, 0. 5234, 0. 6214, 0. 5793, 0. 5374 sur_refl_b 01[0][1], 0. 5759, 0. 5414, 0. 5338, 0. 4489, 0. 432, 0. 5036, 0. 6051, 0. 6214, 0. 5793, 0. 455, 0. 446 sur_refl_b 01[0][2], 0. 4594, 0. 5409, 0. 6224, 0. 6289, 0. 6051, 0. 5005, 0. 3325, 0. 3092, 0. 3826 sur_refl_b 01[0][3], 0. 5831, 0. 6126, 0. 6307, 0. 5277, 0. 612, 0. 3325, 0. 3092, 0. 332, 0. 4036 sur_refl_b 01[0][4], 0. 6329, 0. 6126, 0. 6061, 0. 5691, 0. 612, 0. 5841, 0. 4301, 0. 4782, 0. 6271 sur_refl_b 01[0][5], 0. 6092, 0. 6152, 0. 5691, 0. 6297, 0. 6035, 0. 5052, 0. 4782, 0. 6518, 0. 6913 sur_refl_b 01[0][6], 0. 5712, 0. 6152, 0. 6248, 0. 5686, 0. 3522, 0. 5088, 0. 5912, 0. 6316, 0. 4729, 0. 5756 sur_refl_b 01[0][7], 0. 5737, 0. 524, 0. 5368, 0. 3522, 0. 5691, 0. 5944, 0. 4085, 0. 4729, 0. 5375 sur_refl_b 01[0][8], 0. 5606, 0. 5211, 0. 5368, 0. 5874, 0. 343, 0. 26, 0. 3825, 0. 5794, 0. 5863 sur_refl_b 01[0][9], 0. 5883, 0. 5591, 0. 5263, 0. 4325, 0. 343, 0. 4485, 0. 626, 0. 5462, 0. 3682, 0. 3463 sur_refl_b 01[0][10], 0. 5435, 0. 5263, 0. 4325, 0. 4887, 0. 5175, 0. 626, 0. 5475, 0. 4101, 0. 4592, 0. 4203 UI API Middleware Data Services 17

OPe. NDAP Data Access § OPe. NDAP URLs are complex § Need to know: üSyntax üProduct name üLayer name üTime üGeolocation § § Tile locations (H & V) – Data is aggregated over time by tile Pixel location (Ydim & Xdim) http: //opendap. cr. usgs. gov/opendap/hyrax/MOD 09 Q 1. 005/h 11 v 04. ncml. a scii? sur_refl_b 01[683: 1: 683][2000: 1: 2010] UI API Middleware Data Services 18

Utility / Metadata Services § These Services can help fill in the “complicated” parts of the OPe. NDAP URLs § Geolocation § § The Tilemap service was created to convert Latitude and Longitude information into tile H and V coordinates and x and y pixel locations within the tile. Time Information § Time data in OPe. NDAP is returned as “number of days since 01 -01 -2000 which is hard to convert “in your head” UI API Middleware Data Services 19

Utility / Metadata Services § § Product Service § The LP DAAC’s (coming soon!) Product Service can be used to get information about LP DAAC products and the bands contained within those products. Inventory Service § The inventory service provides a view of data granules in the LP DAAC archive, it presents an alternate way to OPe. NDAP for data access if a user wants to find entire granules of data. UI API Middleware Data Services 20

Utility / Metadata Services and Data Services § Demo § § § Tilemap (also - how do I use this; or – Help!) An OPe. NDAP request (through the LP DAAC aggregated view) Fromjulian Tojulian Inventory Service UI API Middleware Data Services 21

Demo Service Call Wait…. we don’t know how this service works! But if you don’t know how to call it the service will tell you…. https: //lpdaacsvc. cr. usgs. gov/services/tilemap UI API Middleware Data Services 22

Demo Service Help Response UI API Middleware Data Services 23

Demo Service Call https: //lpdaacsvc. cr. usgs. gov/services/tilemap? product=MOD 09 A 1&latitude=44. 306&longitude=-96. 7881 Service Response <tilemap> <horizontal>11</horizontal> <vertical>04</vertical> <line_YDim>1366. 06</line_YDim> <sample_XDim>176. 27</sample_XDim> </tilemap> UI API Middleware Data Services 24

Demo Located! UI API Middleware Data Services 25

Demo § Location is now known § Create OPe. NDAP call for that location http: //opendap. cr. usgs. gov/opendap/hyrax//MOD 09 A 1. 005/h 11 v 04. ncml. ascii? Latitud e[1366: 1: 1366][176: 1: 176], Longitude[1366: 1: 1366][176: 1: 176], sur_refl_b 01[730: 1: 7 33][1366: 1: 1366][176: 1: 176], time[730: 1: 733] § Output Dataset: h 11 v 04. ncml Latitude[0], 44. 3062499960216 Longitude[0], -96. 7900810678634 sur_refl_b 01[0][0], 0. 5054 sur_refl_b 01[1][0], 0. 3101 sur_refl_b 01[2][0], 0. 3967 sur_refl_b 01[3][0], 0. 4866 time, 5860, 5868, 5876, 5884 UI API Middleware Data Services 26

Demo § Output Dataset: h 11 v 04. ncml Latitude[0], 44. 3062499960216 Longitude[0], -96. 7900810678634 sur_refl_b 01[0][0], 0. 5054 sur_refl_b 01[1][0], 0. 3101 sur_refl_b 01[2][0], 0. 3967 sur_refl_b 01[3][0], 0. 4866 time, 5860, 5868, 5876, 5884 § The [730: 1: 733] is getting the last four acquisition dates, but what are they? Fromjulian convert the values to dates. https: //lpdaacsvc. cr. usgs. gov/services/fromjulian? day= 5860, 5868, 5876, 5884 § Jan 17, 2016; Jan 25, 2016; Feb 2, 2016; Feb 10, 2016 Tojulian convert calendar dates to the from 01 -01 -2000 dates to calculate these values in reverse. UI API Middleware Data Services 27

Demo § Other LP DAAC Middleware services provide higher level metadata interactions § Inventory Service – Lists LP DAAC granules and select granule information (powered by NASA CMR) § Lets take a look at this service…. UI API Middleware Data Services 28

Demo § Inventory Service § The LP DAAC Inventory service returns select information about granules in the LP DAAC inventory. It utilizes the information in the NASA Common Metadata Repository (CMR) § URL for the Service § https: //lpdaacsvc. cr. usgs. gov/servcies/inventory UI API Middleware Data Services 29

Demo Service Help Response UI API Middleware Data Services 30

Demo Service Form Response UI API Middleware Data Services 31

Demo Service Form Response UI API Middleware Data Services 32

Demo Service REST GET Call https: //lpdaacsvc. cr. usgs. gov/services/inventory? product=MOD 11 A 1. 006& latitude=43. 6& longitude=-96. 7& date=2010 -01 -01, 2016 -03 -01 UI API Middleware Data Services 33

Demo Service Data Response <inventory> <url> http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2010. 01/MOD 11 A 1. A 2010001. h 10 v 04. 006. 2016025150337. hdf </url> <url> http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2010. 01. 02/MOD 11 A 1. A 2010002. h 10 v 04. 006. 2016025151521. hdf </url> <url> http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2010. 01. 03/MOD 11 A 1. A 2010003. h 10 v 04. 006. 2016025163542. hdf </url> <url> http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2010. 01. 04/MOD 11 A 1. A 2010004. h 10 v 04. 006. 2016025165101. hdf </url>. . . <url> http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2011. 06. 13/MOD 11 A 1. A 2011164. h 10 v 04. 006. 2016057141329. hdf </url> <url> http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2011. 06. 14/MOD 11 A 1. A 2011165. h 10 v 04. 006. 2016057152744. hdf </url> </inventory> UI API Middleware Data Services 34

Demo Service REST GET Call https: //lpdaacsvc. cr. usgs. gov/services/inventory? product=MOD 11 A 1. 006& bbox=-98. 7, 42. 8, -96. 7, 43. 6& julianrange=90 -132& years=2006 -2011& response=metadataurl&output=html UI API Middleware Data Services 35

Demo Service Data Response http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2006. 04. 01/MOD 11 A 1. A 2006091. h 10 v 04. 006. 2015283114357. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2006. 04. 02/MOD 11 A 1. A 2006092. h 10 v 04. 006. 2015283133023. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2006. 04. 03/MOD 11 A 1. A 2006093. h 10 v 04. 006. 2015283140035. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2006. 04/MOD 11 A 1. A 2006094. h 10 v 04. 006. 2015283153952. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2006. 04. 05/MOD 11 A 1. A 2006095. h 10 v 04. 006. 2015283162912. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2006. 04. 06/MOD 11 A 1. A 2006096. h 10 v 04. 006. 2015283174328. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2006. 04. 07/MOD 11 A 1. A 2006097. h 10 v 04. 006. 2015283184609. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2006. 04. 08/MOD 11 A 1. A 2006098. h 10 v 04. 006. 2015283200712. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2006. 04. 09/MOD 11 A 1. A 2006099. h 10 v 04. 006. 2015283212242. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2006. 04. 10/MOD 11 A 1. A 2006100. h 10 v 04. 006. 2015287200907. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2006. 04. 11/MOD 11 A 1. A 2006101. h 10 v 04. 006. 2015287213340. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2006. 04. 12/MOD 11 A 1. A 2006102. h 10 v 04. 006. 2015287233224. hdf. xml. . . http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2011. 05. 10/MOD 11 A 1. A 2011130. h 10 v 04. 006. 2016055053025. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2011. 05. 11/MOD 11 A 1. A 2011131. h 10 v 04. 006. 2016055055057. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2011. 05. 12/MOD 11 A 1. A 2011132. h 10 v 04. 006. 2016055074200. hdf. xml http: //e 4 ftl 01. cr. usgs. gov//MODV 6_Dal_E/MOLT/MOD 11 A 1. 006/2011. 05. 13/MOD 11 A 1. A 2011133. h 10 v 04. 006. 2016055080155. hdf. xml UI API Middleware Data Services 36

Demo Click on the URL, get the metadata file <Granule. Meta. Data. File> <DTDVersion>1. 0</DTDVersion> <Data. Center. Id>EDC</Data. Center. Id> <Granule. URMeta. Data> <Granule. UR>SC: MOD 11 A 1. 006: 2195949529</Granule. UR> <Db. ID>2195949529</Db. ID> <Insert. Time>2015 -10 -10 07: 03: 24. 858</Insert. Time> <Last. Update>2015 -10 -10 07: 03: 24. 858</Last. Update> <Collection. Meta. Data> <Short. Name>MOD 11 A 1</Short. Name> <Version. ID>6</Version. ID> </Collection. Meta. Data> <Data. Files> <Data. File. Container> <Distributed. File. Name>MOD 11 A 1. A 2006091. h 10 v 04. 006. 2015283114357. hdf</Distributed. File. Name> <File. Size>4309570</File. Size> <Checksum. Type>CKSUM</Checksum. Type> <Checksum>4191800068</Checksum> <Checksum. Origin>DPLIngst</Checksum. Origin> </Data. File. Container> </Data. Files> <ECSData. Granule>. . Hint: This would work the same for the browse URL or the data granule URL! UI API Middleware Data Services 37

With the Building Blocks in Place What Next? § Using these building blocks the LP DAAC (or anyone who wants to really) can build new interfaces and systems like…. 38

App. EEARS § Application for § Extracting and Exploring Analysis Ready Samples Web application interface for accessing and extracting LP DAAC’s tiled MODIS and WELD data UI API Middleware Data Services 39

App. EEARS § Built on top of services and tools § Capabilities § Easy access and selection of MODIS and WELD land § § data Extracts pixel values for sample point locations Data exploration and interaction § Dynamic Graphs § Tables § Download Bundle § Analysis-ready data UI API Middleware Data Services 40

DEMO https: //lpdaacsvc. cr. usgs. gov/appeears/ UI API Middleware Data Services 41

Future Activities § The LP DAAC is planning on expanding its service offerings in the future § App. EEARS Area Services API and UI § Quality Values Services § Data Analysis Services § Addition of more tiled datasets into the API and UI UI API Middleware Data Services 42

Future Activities § Area Services will allow for the selection of data over more than just the pixel space. § Data harmonization § Align different datasets § Sample datasets into comparable samples. UI API Middleware Data Services 43

For More Information about our services Subscribe to our listserv: https: //lists. nasa. gov/mailman/listinfo/lpdaac 44

App. EEARS has an API too! § Even App. EEARS is built on top of public services, the App. EEARS API is directly usable, too (its not just an interface!) § App. EEARS API § § Product Service – list of products available through App. EEARS (note the same help context) Quality Service – list the quality layers for products Sample Extraction Service – extracts a sample of data from OPe. NDAP DEMO UI API Middleware Data Services 45

Future Activities UI API Middleware Data Services 46

Demo Service Help Response - json UI API Middleware Data Services 47

Demo Service Help Response - xml UI API Middleware Data Services 48

Demo § If we know the dates we want are 10/08/2015, 10/16/2015, and 10/24/2015, we can find the number of days since 01 -01 -2000 for those dates https: //lpdaacsvc. cr. usgs. gov/services/tojulian? day=10 -08 -2015, 10 -16 -2015, 10 -24, 2015 &output=f 2 k Output: 5759, 5767, 5775 Match those dates with the output form the time parameter to get that data. http: //opendap. cr. usgs. gov/opendap/hyrax//MOD 09 A 1. 005/h 11 v 04. ncml. ascii? time[717: 1: 719] Dataset: h 11 v 04. ncml time, 5759, 5767, 5775 UI API Middleware Data Services 49

Demo § Now we can get that data http: //opendap. cr. usgs. gov/opendap/hyrax/Grouped. Aggregates/MOLT/MOD 09 A 1. 005/h 11 v 04. nc ml. ascii? Latitude[1365: 1: 1365][176: 1: 176], Longitude[1365: 1: 1365][176: 1: 176], sur_refl_b 01[717: 1: 719][1365: 1: 1365][176: 1: 176], time[717: 1: 719] § Output Dataset: h 11 v 04. ncml Latitude[0], 44. 3062499960216 Longitude[0], -96. 7900810678634 sur_refl_b 01[0][0], 0. 0656 sur_refl_b 01[1][0], 0. 0772 sur_refl_b 01[2][0], 0. 0654 time, 5759, 5767, 5775 UI API Middleware Data Services 50

Demo § Product Service § The LP DAAC Product service returns select information about products in the LP DAAC archive. § Coming soon to URL § https: //lpdaacsvc. cr. usgs. gov/servcies/product UI API Middleware Data Services 51

Demo Service Help Response UI API Middleware Data Services 52

Demo Service Help Form Response UI API Middleware Data Services 53

Demo Service Form Entry UI API Middleware Data Services 54

Demo Service Data Response [ { "collection_data": { "title": "Surface Reflectance 8 -Day L 3 Global 500 m", "version_id": "006", "collection_name": "MOD 09 A 1. 006", "short_name": "MOD 09 A 1", "data_center": "LP DAAC" } } ] UI API Middleware Data Services 55

Demo Service REST GET Call https: //lpdaacsvc. cr. usgs. gov/services/product? product=MOD 09 A 1. 006&response=layers UI API Middleware Data Services 56

Demo Service Data Response [ { "collection_data": { "layers": [ { "data_type": "16 -bit unsigned integer", "scale_factor": "0. 0001", "description": "Surface Reflectance Band 1", "units": "Reflectance", "offset": "n", "valid_range": "-100 to 16000", "pixel_size": "n", "sds_name": "Sur_refl_b 01", "rows_cols": "n", "fill_value": "-28672" }, { "data_type": "16 -bit unsigned integer", "scale_factor": "0. 0001", "description": "Surface Reflectance Band 2", "units": "Reflectance", "offset": "n", "valid_range": "-100 to 16000", "pixel_size": "n", "sds_name": "Sur_refl_b 02", "rows_cols": "n", "fill_value": "-28672" }, { "data_type": "16 -bit unsigned integer", "scale_factor": "0. 0001", "description": "Surface Reflectance Band 3", "units": "Reflectance", "offset": "n", "valid_range": "-100 to 16000", "pixel_size": "n", "sds_name": "Sur_refl_b 03", "rows_cols": "n", "fill_value": "-28672" }, { "data_type": "16 -bit unsigned integer", "scale_factor": "0. 0001", "description": "Surface Reflectance Band 4", "units": "Reflectance", "offset": "n", "valid_range": "-100 to 16000", "pixel_size": "n", "sds_name": "Sur_refl_b 04", "rows_cols": "n", "fill_value": "-28672" }, { "data_type": "16 -bit unsigned integer", "scale_factor": "0. 0001", "description": "Surface Reflectance Band 5", "units": "Reflectance", "offset": "n", "valid_range": "-100 to 16000", "pixel_size": "n", "sds_name": "Sur_refl_b 05", "rows_cols": "n", "fill_value": "-28672" }, { "data_type": "16 -bit unsigned integer", "scale_factor": "0. 0001", "description": "Surface Reflectance Band 6", "units": "Reflectance", "offset": "n", "valid_range": "-100 to 16000", "pixel_size": "n", "sds_name": "Sur_refl_b 06", "rows_cols": "n", "fill_value": "-28672" }, { "data_type": "16 -bit unsigned integer", "scale_factor": "0. 0001", "description": "Surface Reflectance Band 7", "units": "Reflectance", "offset": "n", "valid_range": "-100 to 16000", "pixel_size": "n", "sds_name": "Sur_refl_b 07", "rows_cols": "n", "fill_value": "-28672" }, { "data_type": "32 -bit unsigned integer", "scale_factor": "NA", "description": "Surface reflectance 500 m band quality control flags", "units": "Bit Field", "offset": "n", "valid_range": "0 to 4294966275", "pixel_size": "n", "sds_name": "Sur_refl_qc_500 m", "rows_cols": "n", "fill_value": "4294967295" }, { "data_type": "16 -bit signed integer", "scale_factor": "NA", "description": "Surface eflectance 500 m state flags", "units": "Bit Field", "offset": "n", "valid_range": "0 to 57343", "pixel_size": "n", "sds_name": "Sur_refl_state_500 m", "rows_cols": "n", "fill_value": "65535" }, { "data_type": "16 -bit signed integer", "scale_factor": "0. 01", "description": "MODIS solar zenith angle", "units": "Degrees", "offset": "n", "valid_range": "0 to 180", "pixel_size": "n", "sds_name": "Sur_refl_szen", "rows_cols": "n", "fill_value": "0" }, { "data_type": "16 -bit signed integer", "scale_factor": "0. 01", "description": "MODIS view zenith angle", "units": "Degrees", "offset": "n", "valid_range": "0 to 180", "pixel_size": "n", "sds_name": "Sur_refl_vzen", "rows_cols": "n", "fill_value": "0" }, { "data_type": "16 -bit signed integer", "scale_factor": "0. 01", "description": "MODIS relative azimuth angle", "units": "Degrees", "offset": "n", "valid_range": "-8000 to 18000", "pixel_size": "n", "sds_name": "Sur_refl_raz", "rows_cols": "n", "fill_value": "0" }, { "data_type": "16 -bit signed integer", "scale_factor": "NA", "description": "Day of the year for the pixel", "units": "Julian day", "offset": "n", "valid_range": "0 to 366", "pixel_size": "n", "sds_name": "Sur_refl_day_of_year", "rows_cols": "n", "fill_value": "-1" } ] } } ] UI API Middleware Data Services 57