Data

Slope derived from 1" SRTM DEM-S

Commonwealth Scientific and Industrial Research Organisation
Gallant, John ; Austin, Jenet
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.4225/08/5689DA774564A&rft.title=Slope derived from 1 SRTM DEM-S&rft.identifier=https://doi.org/10.4225/08/5689DA774564A&rft.publisher=Commonwealth Scientific and Industrial Research Organisation&rft.description=Slope measures the inclination of the land surface from the horizontal. The percent slope and degrees slope products represent this inclination as the ratio of change in height to distance.\n\nThe slope (percentage) and slope (degrees) products were 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 slope from DEM-S accounted for the varying spacing between grid points in the geographic projection. \n\nThe 3 second resolution slope products were generated from the 1 second percent slope/degrees slope products and masked by the 3” water and ocean mask datasets.\n\nLineage: Source data\n1.\t1 arc-second percent slope product or 1 second degrees slope\n2.\t1 arc-second SRTM-derived Smoothed Digital Elevation Model (DEM-S; ANZCW0703014016).\n3.\t3 second resolution SRTM water body and ocean mask datasets\n\n\nSlope calculation\nSlope was calculated from DEM-S using the finite difference method (Gallant and Wilson, 2000). The different spacing in the E-W and N-S directions due to the geographic projection of the data was accounted for by using the actual spacing in metres of the grid points calculated from the latitude.\n\nThe slope calculation was performed on 1° x 1° tiles, with overlaps to ensure correct values at tile edges.\n\nThe 3 second resolution versions were generated from the 1 second percent or degrees slope products. This was done by aggregating the 1” data over a 3 x 3 grid cell window and taking the mean of the nine values that contributed to each 3” output grid cell. The 3” data were then masked using the SRTM 3” ocean and water body datasets.\n\nReferences\nGallant, J.C. and Wilson, J.P. (2000) Primary topographic attributes, chapter 3 in Wilson, J.P. and Gallant, J.C. Terrain Analysis: Principles and Applications, John Wiley and Sons, New York.&rft.creator=Gallant, John &rft.creator=Austin, Jenet &rft.date=2016&rft.edition=v4&rft.coverage=westlimit=113.0; southlimit=-44.0; eastlimit=154.0; northlimit=-10.0; projection=WGS84&rft_rights=Creative Commons Attribution 4.0 International Licence https://creativecommons.org/licenses/by/4.0/&rft_rights=Data is accessible online and may be reused in accordance with licence conditions&rft_rights=All Rights (including copyright) CSIRO 2012.&rft_subject=Slope&rft_subject=LAND Topography Models&rft_subject=ECOLOGY Landscape&rft_subject=TERN_Soils&rft_subject=Land Surface&rft_subject=Australia&rft_subject=Landscape ecology&rft_subject=Ecological applications&rft_subject=ENVIRONMENTAL SCIENCES&rft_subject=Environmental management&rft_subject=Environmental management&rft_subject=Natural resource management&rft_subject=Land capability and soil productivity&rft_subject=Soil sciences&rft_subject=Soil sciences not elsewhere classified&rft.type=dataset&rft.language=English Access the data
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Creative Commons Attribution 4.0 International Licence
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Data is accessible online and may be reused in accordance with licence conditions

All Rights (including copyright) CSIRO 2012.

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Brief description

Slope measures the inclination of the land surface from the horizontal. The percent slope and degrees slope products represent this inclination as the ratio of change in height to distance.

The slope (percentage) and slope (degrees) products were 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 slope from DEM-S accounted for the varying spacing between grid points in the geographic projection.

The 3 second resolution slope products were generated from the 1 second percent slope/degrees slope products and masked by the 3” water and ocean mask datasets.

Lineage: Source data
1.\t1 arc-second percent slope product or 1 second degrees slope
2.\t1 arc-second SRTM-derived Smoothed Digital Elevation Model (DEM-S; ANZCW0703014016).
3.\t3 second resolution SRTM water body and ocean mask datasets


Slope calculation
Slope was calculated from DEM-S using the finite difference method (Gallant and Wilson, 2000). The different spacing in the E-W and N-S directions due to the geographic projection of the data was accounted for by using the actual spacing in metres of the grid points calculated from the latitude.

The slope calculation was performed on 1° x 1° tiles, with overlaps to ensure correct values at tile edges.

The 3 second resolution versions were generated from the 1 second percent or degrees slope products. This was done by aggregating the 1” data over a 3 x 3 grid cell window and taking the mean of the nine values that contributed to each 3” output grid cell. The 3” data were then masked using the SRTM 3” ocean and water body datasets.

References
Gallant, J.C. and Wilson, J.P. (2000) Primary topographic attributes, chapter 3 in Wilson, J.P. and Gallant, J.C. Terrain Analysis: Principles and Applications, John Wiley and Sons, New York.

Available: 2016-01-04

Data time period: 2000-02-11 to 2000-02-22

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Subjects
Australia | ECOLOGY Landscape | Environmental Sciences | Ecological Applications | Environmental Management | Environmental Management | LAND Topography Models | Land Surface | Land Capability and Soil Productivity | Landscape Ecology | Natural Resource Management | Slope | Soil Sciences | Soil Sciences Not Elsewhere Classified | TERN_Soils |

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