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pluginto:calculators [2021/10/26 20:13] gregbalcopluginto:calculators [2022/05/03 00:22] (current) gregbalco
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 For programmatic use, you most likely want the XML output. Nearly all programming languages have XML parsers that you can use to unpack the XML object and get useful information out of it.  For programmatic use, you most likely want the XML output. Nearly all programming languages have XML parsers that you can use to unpack the XML object and get useful information out of it. 
  
-The URLs for use of the calculators as a web service are <nowiki>http://hess.ess.washington.edu/cgi-bin/matweb</nowiki> for the original server at UW, or <nowiki>http://stoneage.ice-d.org/cgi-bin/matweb</nowiki> for the mirror.  +The URLs for use of the calculators as a web service are <nowiki>http://hess.ess.washington.edu/cgi-bin/matweb</nowiki> for the original server at UW, or <nowiki>http://stoneage.ice-d.org/cgi-bin/matweb</nowiki> for the mirror.  
- +
-This page is incomplete. +
  
 ==== Online exposure age calculator for mostly-spallogenic nuclides (not Cl-36) ==== ==== Online exposure age calculator for mostly-spallogenic nuclides (not Cl-36) ====
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 ^ Field name ^ Description ^ ^ Field name ^ Description ^
 |text_block|A text string containing input text in [[http://stoneage.ice-d.org/math/docs/v3/v3_input_explained.html|calculators v3 input format]]| |text_block|A text string containing input text in [[http://stoneage.ice-d.org/math/docs/v3/v3_input_explained.html|calculators v3 input format]]|
-|mlmfile|'age_input+v3' (identifies script to be used on server)|+|mlmfile|'age_input_v3' (identifies script to be used on server)|
 |reportType|'HTML' or 'XML' to control output format| |reportType|'HTML' or 'XML' to control output format|
 |plotFlag|'yes' or 'no' to enable or disable plot generation| |plotFlag|'yes' or 'no' to enable or disable plot generation|
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 The main difference is that each result from a different nuclide concentration measurement is in its own <nuclide_result>...</nuclide_result> block within the <erosionRateResult>...</erosionRateResult> block that corresponds to the sample. That is, you have to go down one more level to get the erosion rate results. Of course this is a better way to organize it than was originally used in the exposure age XML result. The exposure-age XML should be fixed, but that's a hassle because downstream code that uses it will also have to be fixed.  The main difference is that each result from a different nuclide concentration measurement is in its own <nuclide_result>...</nuclide_result> block within the <erosionRateResult>...</erosionRateResult> block that corresponds to the sample. That is, you have to go down one more level to get the erosion rate results. Of course this is a better way to organize it than was originally used in the exposure age XML result. The exposure-age XML should be fixed, but that's a hassle because downstream code that uses it will also have to be fixed. 
  
-Alsoat the moment this doesn't return normalized nuclide concentrations (Nnorm...) for plotting on two-isotope diagrams. That's mainly because it's not actually really clear how to calculate these for erosion-rate data. +This only returns results as mass erosion rates with units of g/cm<sup>2</sup>. This is because that's the thing that you actually measured. It also returns whatever density you input for each sample so that there is enough information within the XML response to convert to linear units (e.g.m/Myr).  
 + 
 +At the moment this doesn't return normalized nuclide concentrations (Nnorm...) for plotting on two-isotope diagrams. That's mainly because it's not really clear how to calculate these for erosion-rate data. 
  
 Note: there is no erosion rate calculation service for Cl-36.  Note: there is no erosion rate calculation service for Cl-36. 
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 ==== Online exposure age calculator for mostly-spallogenic nuclides (not Cl-36), used for production rate calibration ==== ==== Online exposure age calculator for mostly-spallogenic nuclides (not Cl-36), used for production rate calibration ====
  
-The (non-Cl-36) exposure age calculator can also be used in reverse mode for production rate calibration. +The (non-Cl-36) exposure age calculator can also be used in reverse mode for production rate calibration by setting the mlmfile field to 'cal_input_v3' 
  
-This requires different input that includes the independent age information. +This requires different input that includes the independent age information. Suitable calibration data in the correct input format can be obtained from http://calibration.ice-d.org. It also generates different output -- obviously, the XML will contain production rate estimates for each sample, not exposure ages
  
-This also generates different output+Note: you can only calibrate the production rate for one nuclide at a time. So the input data can only have measurements of one nuclide; otherwise generates an error
  
-Example in MATLAB that obtains a production rate estimate from calibration data and then uses it to compute exposure ages of unknowns.+Here is an example in MATLAB that (i) scrapes calibration data in the appropriate input form from the ICE-D:CALIBRATION website; (ii) sends those data to the web service to generate calibrated production rate parameters; and (iii) uses those calibrated parameters to calculate exposure ages of some unknown-age data.  
 + 
 +This is somewhat complicated but if you are familiar with how the exposure age calculators work, and have gotten through all the previous examples, it should be fairly straightforward.  
 + 
 +<code> 
 +% This gets calibration data from the ICE-D:CALIBRATION website, obtains 
 +% calibrated production rate parameters with it, and uses those calibrated 
 +% production rate parameters to compute exposure ages at an unknown-age 
 +% site.  
 + 
 +clear all; 
 + 
 +% Get some calibration data from the calibration website 
 + 
 +cal_page_html = webread('http://calibration.ice-d.org/cds/1'); 
 + 
 +% Note: this input data must include data for only one nuclide 
 + 
 +% Scrape the formatted text block out of the HTML 
 +startindex = strfind(cal_page_html,'<!-- begin v3 --><pre>') + length('<!-- begin v3 --><pre>'); 
 +endindex = strfind(cal_page_html,'</pre><!-- end v3 -->') - 1; 
 +cal_input_text = cal_page_html(startindex:endindex); 
 + 
 +%% Send that to the online calculator and get calibration results 
 + 
 +url = "http://hess.ess.washington.edu/cgi-bin/matweb"; 
 +cal_xml_result = webread(url,'mlmfile','cal_input_v3','reportType','XML','plotFlag','no','text_block',cal_input_text); 
 + 
 +% Extract calibration information from XML. This is a stupid regexp 
 +% matching scheme. In MATLAB R2021 you can use the proper XML parser.  
 + 
 +% First, get the name of the nuclide -- eventually you will have to send this to the 
 +% calibration code, because you can only do a calibration for one nuclide 
 +% at a time.  
 + 
 +temp = regexp(cal_xml_result,['<nuclide>(.*?)</nuclide>'],'tokens'); 
 +nuclide_string = temp{1}{1}; 
 + 
 +% Get calibrated production rate parameters 
 +% Obviously, the below could be shortened by looping over scaling methods 
 +temp = regexp(cal_xml_result,['<summary_value_St>(.*?)</summary_value_St>'],'tokens'); 
 +value_St_string = temp{1}{1}; 
 +temp = regexp(cal_xml_result,['<summary_uncert_St>(.*?)</summary_uncert_St>'],'tokens'); 
 +uncert_St_string = temp{1}{1}; 
 +temp = regexp(cal_xml_result,['<summary_value_Lm>(.*?)</summary_value_Lm>'],'tokens'); 
 +value_Lm_string = temp{1}{1}; 
 +temp = regexp(cal_xml_result,['<summary_uncert_Lm>(.*?)</summary_uncert_Lm>'],'tokens'); 
 +uncert_Lm_string = temp{1}{1}; 
 +temp = regexp(cal_xml_result,['<summary_value_LSDn>(.*?)</summary_value_LSDn>'],'tokens'); 
 +value_LSDn_string = temp{1}{1}; 
 +temp = regexp(cal_xml_result,['<summary_uncert_LSDn>(.*?)</summary_uncert_LSDn>'],'tokens'); 
 +uncert_LSDn_string = temp{1}{1}; 
 + 
 +%% Now we have the production rate parameters obtained from the calibration 
 +% data.  
 + 
 +% Get some data from ICE-D:ALPINE to calculate the exposure age of 
 + 
 +unknowns_page_html = webread('http://alpine.ice-d.org/site/BST'); 
 + 
 +% Get the formatted text out of the HTML  
 + 
 +startindex = strfind(unknowns_page_html,'<!-- begin v3 --><pre>') + length('<!-- begin v3 --><pre>'); 
 +endindex = strfind(unknowns_page_html,'</pre><!-- end v3 -->') - 1; 
 +unknowns_input_text = unknowns_page_html(startindex:endindex); 
 + 
 + 
 +%% Send sample info to exposure age calculator with additional options to 
 +% force non-default Be-10 production rate 
 + 
 +url = "https://hess.ess.washington.edu/cgi-bin/matweb"; 
 + 
 +unknowns_xml_result_calibrated = webread(url,'mlmfile','age_input_v3','reportType','XML','resultType','long','plotFlag','no',... 
 +    'text_block',unknowns_input_text,... 
 +    'trace_string','nothing here but this is required',... 
 +    'calib_name','nothing here either but this is required too',... 
 +    'nuclide_name',nuclide_string,... 
 +    'P_St',value_St_string,'delP_St',uncert_St_string,... 
 +    'P_Lm',value_Lm_string,'delP_Lm',uncert_Lm_string,... 
 +    'P_LSDn',value_LSDn_string,'delP_LSDn',uncert_LSDn_string); 
 + 
 +%% Here is what it would look like if we omit the additional calibration  
 +% parameters. In this case we get the results using the normal default 
 +% production rate calibration.  
 + 
 +unknowns_xml_result_default = webread(url,'mlmfile','age_input_v3','reportType','XML','resultType','long','plotFlag','no',... 
 +    'text_block',unknowns_input_text); 
 + 
 +% We leave it as an exercise for the student to extract the exposure ages 
 +% from unknowns_xml_result_calibrated and unknowns_xml_result_default, and 
 +% verify that they are different 
 +</code>