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...Gnss rtk is intensively used for surveying nowadays the technique applications and even compete with total station in many areas there are several reasons that evolution signal can be independently of field atmospheric conditions signals day night now tracked processed from light equipment an easy to use users interface operators access immediately coordinates surveyed points procedures quality control local datum results based on network no need line sight between base reference rovers etc limin wu vice director mapping institute kunming rp china but performances operations have also some limitations anna fengxiali graduate student university technology joel van cranenbroeck business development manager leica switzerland fig working week hong kong page contribution limited single due simple modelling only deduced one high ionospherc activities low latitude it well recongnized today overcome zones short radio modem range unreliable a continuous operating stations very communication med...