Chaosheng Zhang said "Another problem is when we carry out spatial interpolation, these values may produce artificial contour lines around these sampling locations, even though they can be smoothed. I don't think this is the realistic situation in the field."
This sounds like the crux of the problem. You sampled data and within it you have discrete large values. You have confidence in the integrity of the data but don't accept that for these values to be genuine you must have all these 'artificial' contour lines. This suggests to me that you are expecting the data to behave so that these large values don't exist, yet you are saying they should be regarded as valid. Is your sampling at a high enough spatial resolution? If you were to sample another point right next to one of these large values would you expect another large value or a more 'normal' one? If you know the answer to that then you should be able to decide whether the large values are truly errors or simply unexpected but valid data. I would suggest the problem here lies with understanding the underlying spatial variation of the data set from which the samples were taken, rather than a problem of which process to apply to the sampled data. Just another way of looking at it! regards, Martin ______________________________________ ArchaeoPhysica Ltd. Reconnaissance & Geophysics for Archaeology Telephone: +44 (0) 7050 369789 E-mail: [EMAIL PROTECTED] Website: http://www.archaeophysica.co.uk ______________________________________ This e-mail is intended only for the addressee named above and may contain confidential or privileged information. If you receive this e-mail by mistake please advise the sender and destroy it without further disclosure of its content. Unless otherwise stated no opinions expressed in this e-mail should be regarded as representative of any policy of ArchaeoPhysica Ltd. -- * To post a message to the list, send it to [EMAIL PROTECTED] * As a general service to the users, please remember to post a summary of any useful responses to your questions. * To unsubscribe, send an email to [EMAIL PROTECTED] with no subject and "unsubscribe ai-geostats" followed by "end" on the next line in the message body. DO NOT SEND Subscribe/Unsubscribe requests to the list * Support to the list is provided at http://www.ai-geostats.org
