U.S. Department of the InteriorU.S. Geological Survey

Topographic Data UpdateTopographic Data Update

IGOL: Rome IGOL: Rome September 13-15, 2004September 13-15, 2004

Doug MuchoneyUSGS

FINAL COVERAGE MAP: FLAT MAP

SRTM: Unfinished 3-arc-second

• All the unfinished 3-arc-sec global data are now available.

• The last 2 areas, Australia and ocean island groups, were released a couple months ago.

• All those data are available via anonymous ftp (as 1x1-degree tiles) from: ftp://edcftp.cr.usgs.gov/pub/data/srtm/

SRTM: Unfinished 1-arc-second

• The unfinished 1-arc-sec data over the U.S. are also available as 1x1-degree tiles on the anonymous ftp site

• The unfinished 1-arc-sec data for the U.S. and 3-arc-sec data for North and South America are available for download and media orders on the seamless server (seamless.usgs.gov).

SRTM: Finished 3-arc-second

• Most of the global 3-arc-sec data are available on media (http://edcsns17.cr.usgs.gov/srtm/index.html).

• The areas of 3-arc-sec finished data that are not yet available are western and southern Africa, and Australia.

• NGA reports that all the final finished data should be done by the end of Sept., so expect that we'll soon have the rest and will have it available for distribution soon thereafter.

SRTM: Finished 1-arc-second

• Finished data, 1-arc-sec data over the U.S. are available on media (http://edcsns17.cr.usgs.gov/srtmdted2/),

Other USGS Activities ….

• Land Cover, Land Cover Trends, Land Cover Derivatives

• Land Surface Parameter

Other USGS Activities ….

• Land Cover, Land Cover Trends, Land Cover Derivatives

• Transportation Derivatives

• Elevation derivatives

• Phenology

• Drought

• Land Surface Parameters, Plot Data

Elevation Derivatives• EDNA is a multi-layered database

derived from a version of the National Elevation Dataset (NED), which has been hydrologically conditioned for improved hydrologic flow representation. The seamless EDNA database provides 30 meters resolution raster and vector data layers including:

• Aspect • Contours • Filled DEM • Flow Accumulation • Flow Direction • Reach Catchment Seedpoints • Reach Catchments • Shaded Relief • Sinks • Slope • Synthetic Streamlines

Land Cover

1976 LUDA 1992 NLCD 2000 NLCD

Land Cover TrendsLand Cover Trends

Cover 1973 1980 1986 1992

Water 1.6% 1.6% 1.6% 1.6%Urban/Built-Up 24.3% 25.1% 26.1% 26.7%Transitional 0.2% 0.2% 0.2% 0.2%Mining/Quarries 0.2% 0.3% 0.3% 0.4%Forests and Woods 33.5% 33.4% 33.2% 33.1%Agriculture 39.5% 38.7% 38.0% 37.4%Wetlands 0.7% 0.7% 0.7% 0.7%

Land cover by Ecoregion

What are the changes in the landscape and how significant are they?

Landsat MSS 1972 Landsat MSS 1980 Landsat MSS 1986

Landsat TM 1992 Landsat ETM+ 2000

North Central Appalachia

Sample Site 1

Remote Sensing and Phenology

Satellite PhenololgyRepeatable observations

Synoptic view

Ability to derive vegetation (greenness) indices

Phenology: Study of the timing of biological eventsbird migration

insect hatching

plant emergence (crops)

bud burst

first leaf

Symptom of global change

Science, June 6, 2003

Seasonal integrated NDVI

Temporal / Phenologic Vegetation Metrics

SPI 7/18/02

Land Cover

Available Water Capacity

Percent Irrigated Farmland

% Avg Seasonal Greenness

Start of Season Date

Regression Tree Modelling

Drought Impact Index

Methodological Approach - Drought

Model Input

Identify variables contributing to drought impact

INPUTS:

Slope Transportation Urban extent Urban exclusion Hillshade Land cover

Model Parameterization - Example using Sleuth

Web

• http://srtm.usgs.gov/

• http://edna.usgs.gov/

• http://gam.usgs.gov

• http://landcover.usgs.gov

Web

• http://srtm.usgs.gov/

• http://edna.usgs.gov/

• http://gam.usgs.gov

• http://landcover.usgs.gov