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Google Maps/Google Earth surveying

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The surveying service uses cartography and elevation data of Google Maps/Google Earth (in order to extract the DEM*).

To use the service you need to:
    • Identify the area to be detected by typing the address or coordinates;
    • Choose from the drop down menu the number of points to detect: the larger is this value, the more accurate the survey will be;
    • Change the zoom and move the displayed area in order to identify the portion of the surface on which to perform the survey: the maximum detectable size is about 1600 hectares;
    • Click on "survey" to perform processing. After the process, you will see a grid above for each vertex the elevation in meters. You can then extract the DEM and satellite maps clicking on the appropriate buttons.

N E X T >>

(*) The DEM is the digital model of a 3D surface, ie the representation of the distribution of elevations on a ground in correspondence of an array of dots arranged at a predetermined spacing.
N.B.: The accuracy of the altimetric data varies from 3 arc-seconds (1 point every 90 meters) to 1/3 arc-second (1 point for every 10 meters), up to 1/9 arc-seconds (1 point every 3 meters) in the U.S. and in many urban areas. The service, made available from Google Maps and Google Earth, comes from the Shuttle Radar Topography Mission (SRTM) project (, U.S. Geological Survey (USGS) ( and others cartographic service. By performing surveys on some sample areas (according to studies in Italy and Nigeria) it's showed a average error about altimetric data of 2,5 meters.. The mapping with satellite maps is always relative to the Google Maps service.

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