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

2 Data survey goal • •

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

4 Weather stations (2) See GCHN ftp://ftp.ncdc.noaa.gov/pub/data/ghcn

5 Weather stations (3) See NOAA https://gis.ncdc.noaa.gov/map/viewer/#app=cdo&cfg=cdo&theme=hourly&layers=1

6 DEM: Digital Elevation Model • Raster where the value of each pixel represents height of its area • Have different resolution (30 m/pixel, 90 m/pixel, etc.) Port Townsend, WA 1/3 arc-second MHW DEM http://www.ngdc.noaa.gov/dem/squareCellGrid/download/366

7 DEM: use cases – flood mapping Pensacola downtown: flooded in April 2014 following intense rainfall. http://www.katrisk.com/floodhazardd

8 DEM: use cases – etc. • Hillshade creation (see today’s lecture) • Drainage Network Creation • 3D Profile Extraction • Building Geometric Networks • DEM Watershed Delineation • etc. Google for more use cases

9 DEM: where to get? 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

Terra satellite, MODIS radiometer Use only non- gridded data L2 or L3 • 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