AI-GEOSTATS: conferences and courses
Hi all I hope no-one will be offended by this e-mail. Given the recent problems with the main Web site, I hope no-one will mind if I remind you all that sandwiched between: AAPG in Denver 3-6 June 2001 and the SIAM conference in Boulder 11-14 June 2001 we are holding the Zero to Kriging in 30 hours course at the IGWMC in Golden, Colorado 7-10 June 2001. Anyone who registers and turns up the day before is invited to my birthday party on 6th!! Details on the course and all other IGWMC activities can be found at http://www.mines.edu/research/igwmc/short-course/geostat.htm Isobel Clark http://uk.geocities.com/geoecosse/news.html Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie -- * 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
AI-GEOSTATS: Kriging colour
Title: Kriging colour Dear All, I am interested in kriging colour (soil colour - of course) and was thinking. Colour is perceived via 3 photoreceptors on the retina, therefore 3 variables are rnecessary and sufficient to represent any colour. Numerical manipulation of Munsell colour codes does not appear to be in any way resonable, then there are the CIE and RGB systems. CIE has 3 variables XYZ and RGB clearly red, green and blue. The RGB system appears the most easily understood. Each variable can range from 0-255, and the variables are additive. The question is does anyone have any experience of constraining the estimates to lie between 0-255, or any ideas about the possible necessity of co-kriging, thanks Benjamin Warr Research Associate to Prof. Ayres, Geostatistician, Environmental Scientist. Postal Address: Centre for the Management of Environmental Resources (CMER) INSEAD Boulevard de Constance, 77305 Fontainebleau Cedex, France Tel: 33 (0)1 60 72 4456 Fax: 33 (0)1 60 74 55 64 e-mail: [EMAIL PROTECTED]
Re: AI-GEOSTATS: Kriging colour
hi, Isn't it more natural to think about kriging in the CIE luv or lab color space since they are uniform and closer to the munsel color space which is used in the field. Interpolation in RGB space seems like a bad idea, and could give wierd results. Also aren't there adbrupt discontinuities in color betweensoil horizons? is color varying smoothly? But I think CIE LUV or LAB makes alot more sense. Nicholas CH3 | N Nicholas Lewin-Koh / \Dept of Statistics NC C==OProgram in Ecology and Evolutionary Biology || || | Iowa State University || || | Ames, IA 50011 CHC N--CH3 http://www.public.iastate.edu/~nlewin \ / \ /[EMAIL PROTECTED] NC | || Currently CH3 O Graphics Lab School of Computing National University of Singapore The Real Part of Coffee[EMAIL PROTECTED] On Tue, 24 Apr 2001, WARR Benjamin wrote: > Dear All, > > I am interested in kriging colour (soil colour - of course) and was > thinking. Colour is perceived via 3 photoreceptors on the retina, therefore > 3 variables are rnecessary and sufficient to represent any colour. Numerical > manipulation of Munsell colour codes does not appear to be in any way > resonable, then there are the CIE and RGB systems. CIE has 3 variables XYZ > and RGB clearly red, green and blue. The RGB system appears the most easily > understood. Each variable can range from 0-255, and the variables are > additive. The question is does anyone have any experience of constraining > the estimates to lie between 0-255, or any ideas about the possible > necessity of co-kriging, > > thanks > > Benjamin Warr > Research Associate to Prof. Ayres, > Geostatistician, Environmental Scientist. > > Postal Address: > Centre for the Management of Environmental Resources (CMER) > INSEAD > Boulevard de Constance, > 77305 Fontainebleau Cedex, > France > > Tel: 33 (0)1 60 72 4456 > Fax: 33 (0)1 60 74 55 64 > e-mail: [EMAIL PROTECTED] > > -- * 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
Re: AI-GEOSTATS: Kriging colour
Benjamin Just a thought. Since your actual colour is a combination of the three primary colours, could you perhaps do a principal components analysis on the three 0-255 colour levels? This would have two effects: (1) would give you variables which expressed the 'combined' colour (2) would highlight the different 'populations' of soil with markedly different colour characteristics. We have used a similar approach to distinguish between limestone types in quarries and for 'brightness' of china clays. Isobel Clark Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie -- * 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
Re: AI-GEOSTATS: Kriging colour
Yes, in fact, check out this work by William Hargrove at Oak Ridge. It is a very effective way to visualize color data weighted by PCA results. His paper on clustering of ecoregions: http://www.esri.com/library/userconf/proc97/proc97/to250/pap226/p226.htm His home page: http://research.esd.ornl.gov/~hnw/ Laura Kracker Isobel Clark wrote: > > Benjamin > > Just a thought. Since your actual colour is a > combination of the three primary colours, could you > perhaps do a principal components analysis on the > three 0-255 colour levels? > > This would have two effects: > > (1) would give you variables which expressed the > 'combined' colour > > (2) would highlight the different 'populations' of > soil with markedly different colour characteristics. > > We have used a similar approach to distinguish between > limestone types in quarries and for 'brightness' of > china clays. > > Isobel Clark > > > Do You Yahoo!? > Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk > or your free @yahoo.ie address at http://mail.yahoo.ie > > -- > * 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 -- Laura M. Kracker, Phd. Research Scientist/GIS Specialist JHT contractor to: Center for Coastal Environmental Health and Biomolecular Research (CCEHBR) NOAA/National Ocean Service 219 Fort Johnson Road Charleston, SC 29412-9100 Phone: 843-762-8640 Fax:843-762-8700 e-mail: [EMAIL PROTECTED] http://www.chbr.noaa.gov - -- * 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
