Exactitude et précision de la mesure de superficie de parcelle de culture

There are a number of important reasons for determining areas: natural resource valorisation and protection, environmental management or others works. But what is a data quality? Accuracy is characterised by systematic errors and mistakes. When these errors are eliminated, the standard deviation qualifies the precision. It is characterized by the random errors that there is no absolute way to eliminate them and which obey the general law of normal distribution. Three formulas are selected according to instruments available to compute the culture parcel area: (1) Area by polar coordinates, (2) Area by rectangular coordinates and (2) formula of Sarron. When parameter measurements are subject to error, areas calculated from the parameters will also be in error. The statistical models associated to each formula are developed to evaluate the precision of area measurement and are checked by simulations. Three types of available instrument according to suitable methods: (1) Total Station, (2) GPS (RTK GPS and DGPS) and (3) Topofil and Compass (forest instruments). These instruments are used in the field to confirm the three variance computation formulas. For all instruments used, approximate and observed variances are equivalent. Two exceptions to this confirmation: the total station and DGPS in case of area determined by a small number of points.

Grantor dc:publisher

ULiège. GxABT - Liège Université. Gembloux Agro-Bio Tech

Year dc:date

2005

Author dc:creator

• Ly, Sarann

Contributors dc:contributor

• Debouche, Charles
• Lejeune, Philippe

• accuracy
• precision
• area
• GPS
• Total station
• topofil
• Physical, chemical, mathematical & earth Sciences
• Earth sciences & physical geography
• Physique, chimie, mathématiques & sciences de la terre
• Sciences de la terre & géographie physique

Statement dc:rights

• restricted access
• info:eu-repo/semantics/restrictedAccess

Licence

• http://purl.org/coar/access_right/c_16ec

Language dc:language

fr

Identifier

info:hdl:2268/96752

OAI identifier oai:identifier

oai:orbi.ulg.ac.be:2268/96752