Quadrilateral Data Structure Geodetic latitude and longitude on GRS80/WGS 84 ellipsoid(NAD 83) Grid cell resolution constant N-S but progressively finer.

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Presentation transcript:

Quadrilateral Data Structure Geodetic latitude and longitude on GRS80/WGS 84 ellipsoid(NAD 83) Grid cell resolution constant N-S but progressively finer E-W resolution from equator to pole

ETOPO5 Global Digital Elevation Model

ETOPO5 Digital Elevation Model (DEM) Row Major Order

World Map (left) made from ETOPO5 DEM

ETOPO2 Global DEM ETOPO2 Global DEM from National Geophysical Data Center from National Geophysical Data Center

Piece of a World Map made from ETOPO2 DEM

Worldwide Land And Sea Elevation Data In Meters (3.7x3.7km cells at equator) Technical Specifications (0,0)(10799,0) (0,5399) (10799,5399) Row Major Order

) Technical Specifications (0,0)(10799,0) (0,5399) (10799,5399) 2-byte signed integer data 5400 rows by columns 116,640,000 byte dataset Row Major Order

ETOPO1 Global DEM ETOPO1 Global DEM from National Geophysical Data Center from National Geophysical Data Center

Worldwide Land And Sea Elevation Data In Meters (1.85x1.85km cells at equator) Technical Specifications (0,0)(21599,0) (0,10799) (21599,10799) Row Major Order

Technical Specifications (0,0)(21599,0) (0,10799) (21599,10799) Row Major Order 2-byte signed integer data rows by columns 466,560,000 byte dataset

Map made from ETOPO1 data

GLOBE 30” x 30” Global Land DEM

Globe 30” x 30” grid cell data structure and tiling, format, and dataset size

Alaska Map Made From Globe Data

STRM30 Plus STRM30 Plus

NGDC 3 Arc-Second Coastal Relief Model

Map made From Coastal Relief Model

National Elevation Dataset (NED) One-second Grid For All U.S. States except…

Two-second Grid For Alaska

National Elevation Dataset (NED) Data Format and Tiling Scheme

Web Mapping Using NED 1” x 1” Data

National Elevation Dataset (NED) 1/3 rd and 1/9 th second Grids For Certain Areas

1/3 rd Second Maps for Monterey

Ordering SRTM Data Data Products Shuttle Radar Topography Mission (SRTM)

SRTM Data Completeness Problems

Map Projection-based Raster Data

USGS 7.5’x7.5’ 10m DEMs for Oregon

USGS 7.5’x7.5’ 10m DEMs for Oregon Available only in SDTS Format

USGS 1:24000-scale Digital Raster Graphics (DRG) scanned topographic maps of U.S. states and territories Scanned at 250 dpi

USGS 1 km Global Land Cover Characteristics database (GLCC) Classified 1km x 1 km AVHRR satellite data Gridded on Interrupted Goode Homolosine and Lambert Equal Area Map Projection Surfaces Now in 30 arc second Quadrilateral Form Several Land Cover Classification Systems Used