raster data sources on the web

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Raster Data Sources on the Web. RASTER A data structure for maps based on grid cells. 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. - PowerPoint PPT Presentation

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Page 1: Raster Data  Sources on the Web
Page 2: Raster Data  Sources on the Web
Page 3: Raster Data  Sources on the Web

Quadrilateral Data Structure

Geodetic latitudeand longitude onGRS80/WGS 84ellipsoid(NAD 83)

Grid cell resolutionconstant N-S butprogressively finer E-W resolution fromequator to pole

Page 5: Raster Data  Sources on the Web

ETOPO5 Digital Elevation Model(DEM)

Row Major Order

Page 6: Raster Data  Sources on the Web

World Map (left) made from World Map (left) made from ETOPO5 DEMETOPO5 DEM

Page 8: Raster Data  Sources on the Web

Piece of a World Map Piece of a World Map made from ETOPO2 DEMmade from ETOPO2 DEM

Page 9: Raster Data  Sources on the Web

Worldwide Land And Worldwide Land And Sea Elevation DataSea Elevation Data

In MetersIn Meters(3.7x3.7km cells at equator)(3.7x3.7km cells at equator)

Technical Specifications(0,0) (10799,0)

(0,5399) (10799,5399)

Row Major Order

Page 10: Raster Data  Sources on the Web

))

Technical Specifications(0,0) (10799,0)

(0,5399) (10799,5399)

2-byte signed integer data5400 rows by 10800

columns116,640,000 byte dataset

Row Major Order

Page 12: Raster Data  Sources on the Web

Worldwide Land And Worldwide Land And Sea Elevation DataSea Elevation Data

In MetersIn Meters(1.85x1.85km cells at equator)(1.85x1.85km cells at equator)

Technical Specifications(0,0) (21599,0)

(0,10799) (21599,10799)

Row Major Order

Page 13: Raster Data  Sources on the Web

Technical Specifications(0,0) (21599,0)

(0,10799) (21599,10799)

Row Major Order

2-byte signed integer data10800 rows by 21600

columns466,560,000 byte dataset

Page 14: Raster Data  Sources on the Web

Map made from ETOPO1 dataMap made from ETOPO1 data

Page 15: Raster Data  Sources on the Web

GLOBE 30” x 30” Global Land DEM

Page 17: Raster Data  Sources on the Web

Alaska Map Made From Globe Data

Page 19: Raster Data  Sources on the Web

NGDC 3 Arc-Second Coastal Relief Model

Page 20: Raster Data  Sources on the Web

Map madeFrom CoastalRelief Model

Page 21: Raster Data  Sources on the Web

National Elevation Dataset (NED)

One-second Grid For All U.S. States except…

Page 22: Raster Data  Sources on the Web

Two-second Grid For Alaska

Page 23: Raster Data  Sources on the Web

National Elevation Dataset (NED)Data Format and Tiling Scheme

Page 24: Raster Data  Sources on the Web

Web Mapping Using NED 1” x 1” Data

Page 25: Raster Data  Sources on the Web

National Elevation Dataset (NED)

1/3rd and 1/9th second Grids For Certain Areas

Page 26: Raster Data  Sources on the Web

1/3rd Second Maps for Monterey

Page 27: Raster Data  Sources on the Web

1/3rd Second Maps for Monterey

Page 28: Raster Data  Sources on the Web

Ordering SRTM Data

Data Products

Shuttle Radar Topography Mission (SRTM)

Page 29: Raster Data  Sources on the Web

SRTM Data Completeness Problems

Page 30: Raster Data  Sources on the Web

Map Projection-basedRaster Data

Page 31: Raster Data  Sources on the Web

USGS 7.5’x7.5’ 10m DEMs for Oregon

Page 32: Raster Data  Sources on the Web

USGS 7.5’x7.5’ 10m DEMs for Oregon

Available only inSDTS Format

Page 33: Raster Data  Sources on the Web

USGS 1:24000-scale Digital Raster

Graphics (DRG)

scanned topographic maps of U.S. states

and territories

Scanned at250 dpi

Page 34: Raster Data  Sources on the Web

USGS 1 km Global Land Cover Characteristics database (GLCC)

Classified 1km x 1 kmAVHRR satellite data

Gridded on Interrupted Goode

Homolosine and Lambert Equal Area Map Projection Surfaces

Now in 30 arc second Quadrilateral Form

Several Land CoverClassification Systems Used