Image Services Providing Access to Scientific Data at NOAA/NCEI
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1 Image Services Providing Access to Scientific Data at NOAA/NCEI Jesse Varner Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado John Cartwright NOAA National Centers for Environmental Information (NCEI)
2 NOAA National Centers for Environmental Information (NCEI) NOAA's National Centers for Environmental Information (NCEI) hosts and provides public access to one of the most significant archives for environmental data on Earth. Through the Center for Weather and Climate and the Center for Coasts, Oceans, and Geophysics, we provide over 25 petabytes of comprehensive atmospheric, coastal, oceanic, and geophysical data.
3 Bathymetric Data Multibeam Bathymetric Surveys - ~2600 cruises, 1980-present - Data acquired from U.S. and international government and academic sources - Global coverage, deep-water and coastal NOAA National Ocean Service (NOS) Hydrographic Surveys - Mainly near-shore U.S. coastal waters - High-resolution data (often 1 meter or better) - Used for nautical charting Digital Elevation Models - Combining the best-available topography and bathymetry - Used for tsunami and storm surge modeling
4 Multibeam Bathymetry Mosaic Raw data is gridded at 3 arcsecond cell size (~90 m) using MB-System Chopped into 10-degree tiles for each survey - ~8700 rasters LERC compression (0.1 m tolerance) - GDAL used to create MRF files Add to mosaic dataset - Mosaic: mean of overlapping surveys Calculate footprints Define overviews - Full 3 arcsecond resolution, global coverage
5 Multibeam Bathymetry Mosaic By default, provides depth in meters (32-bit floating point) ColorHillshade raster function chain for visualization - Renders elevation using a color map - Combined with grayscale hillshade using pansharpening - No Alteration of Grayscale or Intensity (NAGI) Fusion method - Fill in small gaps with Elevation Void Fill R/V Falkor -- Papahānaumokuākea Marine National Monument
6 Multibeam Bathymetry Mosaic 3 Related Image Services
7 Multibeam Bathymetry Mosaic Coverage
8 Mariana Trench/Guam region Mid-Atlantic Ridge Gulf of Mexico Puerto Rico/Virgin Islands
9 Bathymetric Data Viewer Queries image service to display a single survey Text goes here
10 NOS Hydrographic Surveys BAG Mosaics BAGs: Bathymetric Attributed Grids Near-shore high-res data Wide range of cell sizes (50 cm to 10+ m) Overlapping, irregular footprints For mosaic: higher-res on top of lower To do: prioritize date of survey 4m 2m 1m Combined Together
11 BAG Mosaics Overview Schema Consistently control the visibility scales of overviews and source rasters Source rasters: visible from 0 (fully-zoomed in) to pixel size = 4m Overviews start at 4m threshold - Overview sampling factor 2 (4m, 8m, 16m, 32m, 64m, ) Overviews are defined everywhere, even if that results in up-sampling - Temporarily set lowps=4 for all source rasters, then run Define Overviews
12 BAG Mosaic Visibility Scales
13 Overview Tiles complete coverage within boundary
14 BAG Mosaic Color Hillshade Visualization
15 BAG Mosaic Server-Side Function Templates Default: depth in meters (mean lower-low water) Color Hillshade, Grayscale Hillshade, Slope (numeric), Slope (RGB), Aspect (numeric), Aspect (RGB) Function templates borrowed from Esri s Elevation Services Grayscale Hillshade Color Hillshade Slope RGB Map Aspect RGB Map
16 BAG Mosaic Examples Mattole Canyon, CA
17 BAG Mosaic Examples Coral reefs, Puerto Rico
18 BAG Mosaic Examples Glacier Bay, AK
19 BAG Mosaic Examples Columbia River, WA/OR
20 BAG Mosaic Examples Shipwreck near mouth of Chesapeake Bay
21 Digital Elevation Models Combine data from multiple sources (multibeam, hydrographic surveys, lidar, etc.) Used for tsunami and storm surge modeling 3 image services separated by vertical datum: MHW, MHHW, NAVD88
22 DEM Global Mosaic A best-of compilation of DEMs NOAA/NCEI DEMs, along with other regional/global sources (GEBCO_2014, IBCAO (Arctic), IBCSO (Antarctic), Hawaii Multibeam Compilation DEMs are ordered by resolution and date of completion Color Hillshade, Slope, Aspect function chains
23 DMSP Nighttime Lights Defense Meteorological Satellite Program Cloud-free composites from 1992 to 2013 Time-based mosaic dataset 5 complementary image services: - Average visible band - Stable Lights - Cloud-free coverage - Percent lights - Avg lights X pct
24 DMSP Nighttime Lights
25 DMSP Nighttime Lights Demo Animation with Time Slider
26 Future Work: VIIRS Imagery Suomi NPP satellite Nightly Imagery from Day/Night Band (DNB) Two nighttime thermal bands Monthly/annual DNB composites Will be served to the public via mosaic datasets and image services Services will automatically update as data arrives
27 Geomagnetic Models EMAG2: Earth Magnetic Anomaly Grid (2 arcminute resolution) Compiled from satellite, ship, and airborned measurements Insight into subsurface structure and composition of Earth s crust Raster data served as an image service
28 EMAG2
29 Geomagnetic Models Future Work Crustal magnetic models - Mix of different resolutions - use mosaic dataset for overlapping data World Magnetic Model - Magnetic declination time-based mosaic dataset
30 AVHRR Pathfinder Sea Surface Temperature Sea Surface Temperature Monthly Averages Demo
31 Thank You! Contacts: Website: NOAA s Geoplatform (ArcGIS Online for Organizations) - Content in NCEI Group: 0b3969ae
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