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SRTM Grid Cell Area (3" resolution) derived from 3" SRTM DEM-S

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About this Collection

SRTM Grid Cell Area (3" resolution) derived from 3" SRTM DEM-S


The SRTM grid cell area dataset has values of cell area in square metres. The grid cell area product was derived from the Smoothed Digital Elevation Model (DEM-S; ANZCW0703014016), which was derived from the 1 second resolution SRTM data acquired by NASA in February 2000. The calculation of grid cell area from the DEM-S accounted for the varying... more


Environmental Management Land Capability and Soil Degradation Landscape Ecology Natural Resource Management Soil Sciences not elsewhere classified


https://doi.org/10.4225/08/50AC89675E6DD


11 Feb 2000


22 Feb 2000


CSIRO Enquiries
CSIROEnquiries@csiro.au
1300 363 400

Grid Cell Area LAND Topography Models ECOLOGY Landscape TERN_Soils Land Surface Australia


Source data 1. 3 second SRTM-derived Smoothed Digital Elevation Model (DEM-S; ANZCW0703014016) Area calculation The 3 second resolution data has a cell size of 0.0008333333333 decimal degrees and the 1 degree extent input tiles have 1200 rows and 1200 columns. Cell width changes with latitude (decreases as latitude increases); width is recalculated for each row in the grid based on the centre of the cell. Radius for calculating distance around a parallel (constant latitude, in radians): N = a / sqrt ( 1 - e^2 sin^2(lat) ) e^2 is the square of the eccentricity, calculated from flattening (f) Radius for calculating distance along a meridian (constant longitude): M = a ( 1 - e^2 ) / ( 1 - e^2 sin^2(lat) ) ^ (3/2) The 1 - e^2 sin^2(lat) term is used in both M and N, so it is calculated as p a = 6 378 137 m (in WGS84) f = 1/298.257223563 (in WGS84) e2 = f * (2 - f) p = 1 - e2 * sqr(sin(lat)) N = a / sqrt(p) M = a * (1 - e2) / (p * sqrt(p)) The length of 1 degree in longitude and latitude are: long_len = N * cos(lat) * PI / 180.0 lat_len = M * PI / 180.0 The area of a 3 second grid cell is: lat_len * long_len / 1200^2


Access to this data has been made possible by the Terrestrial Ecosystem Research Network (TERN), supported by the Australian Government through the National Collaborative Research Infrastructure Strategy and the Super Science Initiative.


Creative Commons Attribution 3.0 Unported Licence


CSIRO (Australia)


Gallant, John; Austin, Jenet (2012): SRTM Grid Cell Area (3" resolution) derived from 3" SRTM DEM-S. v1. CSIRO. Data Collection. https://doi.org/10.4225/08/50AC89675E6DD


All Rights Reserved (including copyright) CSIRO Australia 2012.


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Location Details

10°0′0″ S


44°0′0″ S


154°0′0″ E


113°0′0″ E


WGS84


More about this Collection

John Gallant


Terrain Analysis Research Team Leader


0 m


0 m



Raster




eng


UTF8


Elevation


About this Project

1181.2 TERN Facility No9 InfoGrid GRUNDY


The Soil and Landscape Grid of Australia is a comprehensive fine spatial resolution grid of functional soil attributes and key landscape features across Australia. The landscape attributes are derived from the data collected by the Shuttle Radar Topography Mission, whilst the soil attribute surfaces are modelled from existing soils information. The... more


John Gallant


National Elevation and Terrain Datasets


SRTM-derived elevation and terrain covariate datasets at 1 second or 3 second resolution


Measurement


John Gallant


Jenet Austin


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