Geoapplications development http://rgeo.wikience.org Higher School - - PowerPoint PPT Presentation

Geoapplications development http://rgeo.wikience.org

Higher School of Economics, Moscow, www.cs.hse.ru

Data survey goal

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Weather stations

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See GCHN ftp://ftp.ncdc.noaa.gov/pub/data/ghcn

Weather stations (2)

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See GCHN ftp://ftp.ncdc.noaa.gov/pub/data/ghcn

Weather stations (3)

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See NOAA

https://gis.ncdc.noaa.gov/map/viewer/#app=cdo&cfg=cdo&theme=hourly&layers=1

DEM: Digital Elevation Model

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Port Townsend, WA 1/3 arc-second MHW DEM http://www.ngdc.noaa.gov/dem/squareCellGrid/download/366

• Raster where the value of each pixel

represents height of its area

• Have different resolution (30 m/pixel, 90

m/pixel, etc.)

DEM: use cases – flood mapping

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http://www.katrisk.com/floodhazardd

Pensacola downtown: flooded in April 2014 following intense rainfall.

DEM: use cases – etc.

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Google for more use cases

• Hillshade creation (see today’s lecture)
• Drainage Network Creation
• 3D Profile Extraction
• Building Geometric Networks
• DEM Watershed Delineation
• etc.

DEM: where to get?

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Repository: http://earthexplorer.usgs.gov/ Standards: http://nationalmap.gov/standards/demstds.html Info: https://en.wikipedia.org/wiki/Digital_elevation_model https://en.wikipedia.org/wiki/Elevation

Use only non- gridded data L2 or L3

Terra satellite, MODIS radiometer

• Частота:

ежедневно

• Покрытие:

глобально

Point clouds

• Many photos
• Snavely: building Rome in a day

Snavely

Point clouds (2)

• see http://pointclouds.org/ as a tool

Snavely