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Foreign individuals or organizations that wish to conduct surveying must form a Chinese-foreign joint venture. [1] Between 2006 and 2011, the authorities pursued around 40 illegal cases of mapping and surveying. [6] The media has reported on other cases of unlawful surveys:
This can bias estimates calculated using survey data. [3] For example, a researcher may wish to study the opinions of registered voters (target population) by calling ...
This is a list of GIS data sources (including some geoportals) that provide information sets that can be used in geographic information systems (GIS) and spatial databases for purposes of geospatial analysis and cartographic mapping. This list categorizes the sources of interest.
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Topographic survey information is historically based upon the notes of surveyors. They may derive naming and cultural information from other local sources (for example, boundary delineation may be derived from local cadastral mapping). While of historical interest, these field notes inherently include errors and contradictions that later stages ...
The external forces are produced by sources of local attraction which may be current carrying wire (magnetic materials) or metal objects. [2] The term is also used to denote amount of deviation of the needle from its normal position. It mostly causes errors in observations while surveying and thus suitable methods are employed to negate these ...
Survey of India, India's central agency in charge of mapping and surveying; Ordnance Survey, a national mapping agency for Great Britain; U.S. National Geodetic Survey, performing geographic surveys as part of the U.S. Department of Commerce; United States Coast and Geodetic Survey, a former surveying agency of the United States Government