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Re: questions regarding udunits
This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
- Subject: Re: questions regarding udunits
- Date: Mon, 14 Apr 2008 16:11:45 -0600
Hi Noman, I think you want the (currently beta) UDUNITS-2 package, linked from here: http://www.unidata.ucar.edu/software/udunits/ It has support for non-English locales. I'm CC:ing the support-udunits address to get an answer your time question. I'll answer the non-udunits questions in a subsequent response. --Russ > This is a multi-part message in MIME format. > > ------_=_NextPart_001_01C89E75.DC6CA473 > Content-Type: text/plain; > charset="us-ascii" > Content-Transfer-Encoding: quoted-printable > > Russ/John, > > We are currently using udunits library ver. 1.12.4, compiled and linked > locally with Visual C++ .NET 2003. We call into their C API with higher > level C++ and COM functions. The API is being used as explained in > unidata's udunits manual pages. We use it on multiple platforms. > > Some of the questions we have at this point are:=20 > 1. Does the present version of udunits we are using, support > non-English locales such as German, Chinese etc.? If so, why does it not > work for us? Do we need to do anything special? > 2. If multiple locales are not supported in the present version, > are there any plans to support this in future versions? > 3. When we use the library API with different time variable types > (ex:, float vs double) having the same value, are we going to see a > change in precision? We are getting back slightly different dates when > the time variable types are of different type. > > Other questions: > 1. Is it possible to have a variable (for station data) where char > type is used as a dimension? You have any example? > 2. For gridded data, I believe there is an attribute to specify > whether the location is cell center or not. What is that attribute and > acceptable values? Is this attribute CF complainant? > > Thanks, > Noman > > -----Original Message----- > From: Russ Rew [mailto:address@hidden]=20 > Sent: Monday, April 07, 2008 3:35 PM > To: Steve Kopp > Cc: address@hidden; address@hidden; address@hidden; Nawajish > Noman > Subject:=20 > > Hi Steve, > > John Caron forwarded your note to me and Ed Hartnett: > > I'm going to be in town Tuesday afternoon and have a little time. We > are > > looking at including netCDF 4 in ArcGIS 9.4, which will be begin > > development on in the next month or so, and are looking to be feature > > complete in Q3 or early Q4 2008. Would it be useful/possible to get > > together for an hour or so in the early afternoon? > > John probably won't be able to meet early tomorrow afternoon, and Ed may > be jet-lagged after returning from Europe, but I'm available. I've > tentatively set up a 1:30pm meeting in our small meeting room for you, > me, Ed (if available), and Dennis (a new developer who might be able to > attend to learn more about use of netCDF in ESRI software). I could > move the meeting to 1:00pm in case you need to leave earlier ... > > --Russ > _____________________________________________________________________ > > Russ Rew UCAR Unidata Program > address@hidden http://www.unidata.ucar.edu > > > ------_=_NextPart_001_01C89E75.DC6CA473 > Content-Type: text/html; > charset="us-ascii" > Content-Transfer-Encoding: quoted-printable > > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> > <HTML> > <HEAD> > <META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; = > charset=3Dus-ascii"> > <META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version = > 6.5.7652.24"> > <TITLE>questions regarding udunits</TITLE> </HEAD> > <BODY> > <!-- Converted from text/rtf format --> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">Russ/John,</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">We are = > currently using udunits library ver. 1.12.4, compiled and linked locally = > with Visual C++ .NET 2003. We call into their C API with higher level = > C++ and COM functions. The API is being used as explained in = > unidata’s udunits manual pages. We use it on multiple = > platforms.</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">Some = > of the questions we have at this point are: </FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">1. </FONT></SPAN><SPAN = > LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 = > FACE=3D"Verdana">Does the present version of udunits we are using, = > support</FONT></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 = > FACE=3D"Verdana">non-English</FONT></SPAN><SPAN LANG=3D"en-us"><FONT = > SIZE=3D2 FACE=3D"Verdana"> locales</FONT></SPAN><SPAN = > LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana"> such as German, Chinese = > etc.</FONT></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">? = > If so, why does it not work for us?</FONT></SPAN><SPAN = > LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana"> Do we need to do = > anything special?</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">2. </FONT></SPAN><SPAN = > LANG=3D"en-us"> <FONT SIZE=3D2 FACE=3D"Verdana">If multiple locales are = > not supported in the present version, are there any plans to support = > this in future versions?</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">3. </FONT> <FONT SIZE=3D2 = > FACE=3D"Verdana">When we use the library API with different time = > variable types (ex:, float vs double) having the same value, are we = > going to see a change in precision?</FONT></SPAN><SPAN = > LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana"> We are getting = > back</FONT></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 = > FACE=3D"Verdana">slightly</FONT></SPAN><SPAN LANG=3D"en-us"><FONT = > SIZE=3D2 FACE=3D"Verdana"> different dates</FONT></SPAN><SPAN = > LANG=3D"en-us"> <FONT SIZE=3D2 FACE=3D"Verdana">when the time variable = > types are of different type.</FONT></SPAN><SPAN = > LANG=3D"en-us"></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">Other = > questions:</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">1. </FONT></SPAN><SPAN = > LANG=3D"en-us"> <FONT SIZE=3D2 FACE=3D"Verdana">Is it possible to have a = > variable (for station data) where</FONT></SPAN><SPAN LANG=3D"en-us"> = > <FONT SIZE=3D2 FACE=3D"Verdana">char type</FONT></SPAN><SPAN = > LANG=3D"en-us"> <FONT SIZE=3D2 FACE=3D"Verdana">is</FONT></SPAN><SPAN = > LANG=3D"en-us"> <FONT SIZE=3D2 FACE=3D"Verdana">used as a = > dimension</FONT></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">?</FONT></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana"> You have any example?</FONT></SPAN><SPAN = > LANG=3D"en-us"></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">2. </FONT></SPAN><SPAN = > LANG=3D"en-us"> <FONT SIZE=3D2 FACE=3D"Verdana">For gridded = > data,</FONT></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 = > FACE=3D"Verdana">I believe there is an attribute to specify whether the = > location is cell center or not. What is that attribute and acceptable = > values?</FONT></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 = > FACE=3D"Verdana">Is this attribute CF complainant?</FONT></SPAN><SPAN = > LANG=3D"en-us"></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">Thanks,</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">Noman</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">-----Original Message-----<BR> > From: Russ Rew [<A = > HREF=3D"mailto:address@hidden";>mailto:address@hidden</A>]<B= > R> > Sent: Monday, April 07, 2008 3:35 PM<BR> > To: Steve Kopp<BR> > Cc: address@hidden; address@hidden; address@hidden; Nawajish = > Noman<BR> > Subject:</FONT></SPAN><SPAN LANG=3D"en-us"> </SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">Hi = > Steve,</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">John = > Caron forwarded your note to me and Ed Hartnett:</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">> = > I'm going to be in town Tuesday afternoon and have a little time. We = > are</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">> = > looking at including netCDF 4 in ArcGIS 9.4, which will be = > begin</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">> = > development on in the next month or so, and are looking to be = > feature</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">> = > complete in Q3 or early Q4 2008. Would it be useful/possible to = > get</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">> = > together for an hour or so in the early afternoon?</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">John = > probably won't be able to meet early tomorrow afternoon, and Ed = > may</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">be = > jet-lagged after returning from Europe, but I'm available. = > I've</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">tentatively set up a 1:30pm meeting in our small = > meeting room for you,</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">me, Ed = > (if available), and Dennis (a new developer who might be able = > to</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">attend = > to learn more about use of netCDF in ESRI software). I = > could</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">move = > the meeting to 1:00pm in case you need to leave earlier = > ...</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">--Russ</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">________________________________________________________= > _____________</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Verdana">Russ = > Rew &nbs= > p;  = > ; = > UCAR Unidata Program</FONT></SPAN></P> > > <P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 = > FACE=3D"Verdana">address@hidden  = > ; = > <A = > HREF=3D"http://www.unidata.ucar.edu";>http://www.unidata.ucar.edu</A></FON= > T></SPAN></P> > > </BODY> > </HTML> > ------_=_NextPart_001_01C89E75.DC6CA473--
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