1 / 11

LP DAAC Data Access through OPeNDAP and Web Services

LP DAAC Data Access through OPeNDAP and Web Services. LP DAAC Data Access. Data Pool and MODIS ~ 1500 terabytes (compressed) Including Collection 6 (partial) Request granules via URL http://e4ftl01.cr.usgs.gov/MOLT/MOD09Q1.005/2015.01.09/MOD09Q1.A2015009.h11v04.005.2015027222534.hdf

rmorley
Download Presentation

LP DAAC Data Access through OPeNDAP and Web Services

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. LP DAAC Data Access through OPeNDAP and Web Services

  2. LP DAAC Data Access • Data Pool and MODIS • ~1500 terabytes (compressed) • Including Collection 6 (partial) • Request granules via URL http://e4ftl01.cr.usgs.gov/MOLT/MOD09Q1.005/2015.01.09/MOD09Q1.A2015009.h11v04.005.2015027222534.hdf • Single granule downloaded locally • Full Spatial extent • All associated bands • Single day/composite period

  3. OPeNDAP Data Access • Access and extract discrete subsets • Spatial • Band/Layers • Temporal • Request data via URL http://opendap.cr.usgs.gov/opendap/hyrax/MOD09Q1.005/h11v04.ncml.ascii?sur_refl_b01[683:1:683][2000:1:2010][2000:1:2010] • Returns data that the user intends to use! • Reduces time spent downloading and processing • Minimizes the amount of data downloaded

  4. OPeNDAP Data Access OPeNDAP request: http://opendap.cr.usgs.gov/opendap/hyrax/MOD09Q1.005/h11v04.ncml.ascii?sur_refl_b01[683:1:683][2000:1:2010][2000:1:2010] Return: Dataset: h11v04.ncml sur_refl_b01[0][0], 0.5359, 0.5657, 0.5258, 0.4739, 0.4648, 0.5087, 0.5234, 0.5234, 0.6214, 0.5793, 0.5374 sur_refl_b01[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_b01[0][2], 0.4594, 0.5409, 0.6224, 0.6289, 0.6289, 0.6051, 0.5005, 0.5005, 0.3325, 0.3092, 0.3826 sur_refl_b01[0][3], 0.5831, 0.5831, 0.6126, 0.6307, 0.6307, 0.5277, 0.612, 0.3325, 0.3092, 0.332, 0.4036 sur_refl_b01[0][4], 0.6329, 0.6126, 0.6061, 0.5691, 0.5691, 0.612, 0.5841, 0.5841, 0.4301, 0.4782, 0.6271 sur_refl_b01[0][5], 0.6092, 0.6092, 0.6152, 0.5691, 0.6297, 0.6035, 0.5052, 0.5052, 0.4782, 0.6518, 0.6913 sur_refl_b01[0][6], 0.5712, 0.6152, 0.6248, 0.5686, 0.5686, 0.3522, 0.5088, 0.5912, 0.6316, 0.4729, 0.5756 sur_refl_b01[0][7], 0.5737, 0.5737, 0.524, 0.5368, 0.3522, 0.5691, 0.5944, 0.4085, 0.4729, 0.5375, 0.5375 sur_refl_b01[0][8], 0.5606, 0.5211, 0.5368, 0.5874, 0.5874, 0.343, 0.26, 0.26, 0.3825, 0.5794, 0.5863 sur_refl_b01[0][9], 0.5883, 0.5591, 0.5263, 0.4325, 0.343, 0.4485, 0.626, 0.626, 0.5462, 0.3682, 0.3463 sur_refl_b01[0][10], 0.5435, 0.5263, 0.4325, 0.4887, 0.4887, 0.5175, 0.626, 0.5475, 0.4101, 0.4592, 0.4203

  5. OPeNDAP Data Access • OPeNDAP URLs are complex • Need to know: • Syntax • Product name • Layer name • Time • Geolocation • Tile locations (H & V) • Pixel location (Ydim & Xdim) http://opendap.cr.usgs.gov/opendap/hyrax/MOD09Q1.005/h11v04.ncml.ascii?sur_refl_b01[683:1:683][2000:1:2010][2000:1:2010]

  6. Implementation Architecture

  7. Implementation Architecture Connects

  8. AppEEARS • Application for Extracting and Exploring Analysis Ready Samples • Web application interface for accessing and extracting LP DAAC’s tiled MODIS data

  9. AppEEARS • Built on top of services and tools • Capabilities • Easy access and selection of MODIS product land • Extracts pixel values for sample point locations • Data exploration and interaction • Dynamic Graphs • Tables • Download Bundle • Analysis-ready data

  10. AppEEARS Data Bundle

  11. DEMO https://lpdaacsvc.cr.usgs.gov/appeears/

More Related