[UMN_MAPSERVER-USERS] simple tool for conversion
Joseph Norris
sirronj at PACBELL.NET
Thu Dec 9 14:16:52 EST 2004
To all on and off the list,
Please do not take my email just sent as any more than frustration with
trying to accomplish a given task and not understanding all of the tools
involved with the task. Yes what you have said is important - an
understanding of these cartography principals is very important and I wish
to add that nothing I said in my email was in any way an attempt to offend
anyone. I just expressed my frustration at where I am in this project at
the moment.
However.....
My position is what I state in my signature. I am first and foremost an
application programmer in the areas given below. I have written accounting
systems and I would say that I have no knowledge of accounting other than
being put with those who do. I have written a advanced javascript and dbf
manipulation modules for ARCIMS applications knowing nothing of Mapping
other than being with those who do, publishing systems for publishers -
knowing nothing of publishing other than being with those who do, advanced
encrypting code - with little or no knowledge to the Math that went into
creating the algorithm - but working with those who do . In other words for
the past 20 years I have had to adapt what I do to the needs of users that
were far more advanced in their fields than I could ever hope to be. In
each case, they could always provide me with a model that I could follow to
continue production.
I would never claim to be able to acquire the expertise that you have
acquired in your field and though I love this whole GIS concept, I am not in
the position to get to level that you have on the timeline that I have at
this moment. Remember that this was a proof of concept exercise. If proof is
provided it could lead to a timeline that would allow the deeper
understanding of the issues involved. The proof of concept was:
1. get mapserver running with demo - completed
2. create a linux based GIS lab environment with all of the tools (perl
modules, command line, web based etc.) completed
3. pull data from Mysql database and put a point for each record pulled from
the database on my California zip map - not completed
4. be happy with new projects that would extend 2 and my own knowledge of
GIS
I am at 3 with this problem and I am trying to get to 4, but time is running
out for 3.
Thanks to all for your patience and your help - again I am sorry if I caused
any offence.
#Joseph Norris (Perl - what else is there?/Linux/CGI/Mysql) print @c=map chr
$_+100,(6,17,15,16,-68,-3,10,11,16,4,1,14,-68,12,1,14,8,-68,4,-3,-1,7,1,14,-
68,-26,11,15,1,12,4,-68,-22,11,14,14,5,15,-90);
-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at lists.umn.edu]On
Behalf Of Skweda O'Bomsawin
Sent: Thursday, December 09, 2004 10:50 AM
To: MAPSERVER-USERS at lists.umn.edu
Subject: [UMN_MAPSERVER-USERS] RE : [UMN_MAPSERVER-USERS] simple tool for
conversion
Joseph,
I would like to say that we are trying to help you as best as we can. But
the projections concepts are not easy to understand and requires many
knowledge that obviously you don't have (no offense). Many of us has
studied in geographic, cartographic or geomatic domain and learned the
projection concepts in classrooms or read a lot about that. So as a
"newbie" like you say, I recommend you to take the time to demystify the
projections and underlying concepts and maybe meet a person who can help you
(it's more easy to understand something when somebody can explain it in
front of you, not by e-mail!).
To begin, I recommend you to take a look at these simple tutorials which
will guide you through the concepts of projection systems:
HYPERLINK
"http://www.colorado.edu/geography/gcraft/notes/coordsys/coordsys_f.html"htt
p://www.colorado.edu/geography/gcraft/notes/coordsys/coordsys_f.html
HYPERLINK
"http://www.geo.hunter.cuny.edu/mp/index.html"http://www.geo.hunter.cuny.edu
/mp/index.html
HYPERLINK
"http://www.udel.edu/johnmack/frec480/480lec_projections.html"http://www.ude
l.edu/johnmack/frec480/480lec_projections.html
After, you will be able to better understand the parameters to set in proj
as well as the dynamic and impact of projected and unprojected datas. These
concepts are the basis of a good understanding of Mapserver.
Hope this will help you to clarify all these concepts!
Skweda O'Bomsawin
-----Message d'origine-----
De : UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] De la
part de Joseph Norris
Envoyé : 9 décembre 2004 12:12
À : MAPSERVER-USERS at LISTS.UMN.EDU
Objet : Re: [UMN_MAPSERVER-USERS] simple tool for conversion
Ethan,
At the risk of being flamed into non-existence on this subject. I have
repeatedly modified my map file to include the projection blocks that you
and others in this list have mentioned. Each change has provided no
results. I have sent copies of my projection file for the California zip
map and I have received no explanation of what the terms mean. I have tried
to get simple features to work and this has been unsuccessful.
I am a complete newbie in the use of mapserver and I have approached the
list giving full knowledge of this. Not seeing any change at all between my
teacher location shapefile and my California zip file, I began to examine
in detail the shapefile itself - my teacher shapefile.
I used the utility fGIS a free arcview look-a-like and I began to manually
build a teacher point layer over my California zip map and then dump the
shape file. ( Incidentally I could bring both my California zip file and the
Teacher point file that I built manually up to my mapserver and it displays
perfectly)
After examining my new point shapefile built with fGIS, I found no lat/long
information that was in accord with the lat/long information I have in my
database. This led me to the conclusion that I had to convert my lat/long
data to x/y coordinates in accord with the California Zip file.
Again I began to ask on this list about this - the use of proj and
conversion utilities etc. I even asked about ( in replies to others
inquires ) formulas for conversion. I received replies of learn basic
algebra or something along that line. This was of no offense to me but it
was not productive.
Many of the discoveries that I have made that have furthered my on
understanding have resulted from serious hacking sessions of writing script
after script trying to find some correlation between the entries of one
shapefile to entries in the other.
I keep asking questions following the Chinese proverb: better to ask a
question and look the fool for 5 minutes than not ask and look the fool for
a lifetime.
The term "newbie" which does not register in my spell-checker should be
taken seriously and in all fairness some of the list members have take me
as such and been very helpful. I apologies to any and all if my newbie-ness
has caused any frustration.
#Joseph Norris (Perl - what else is there?/Linux/CGI/Mysql) print @c=map chr
$_+100,(6,17,15,16,-68,-3,10,11,16,4,1,14,-68,12,1,14,8,-68,4,-3,-1,7,1,14,-
68,-26,11,15,1,12,4,-68,-22,11,14,14,5,15,-90);
-----Original Message-----
From: Ethan Alpert [mailto:ealpert at digitalglobe.com]
Sent: Thursday, December 09, 2004 6:27 AM
To: Joseph Norris; MAPSERVER-USERS at LISTS.UMN.EDU
Subject: RE: [UMN_MAPSERVER-USERS] simple tool for conversion
I still don't see why you feel you must reproject your lat/long data. Look
back at the emails people have sent you. You just need to set a correct
PROJECTION block for each layer and the mapfile and mapserver will take care
of the rest.
-e
_____
From: UMN MapServer Users List on behalf of Joseph Norris
Sent: Wed 12/8/2004 4:40 PM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] simple tool for conversion
I do the following:
[joseph at spare:]$ proj +units=us-ft +init=nad83:4202 <<EOD
> -119.770623
> 36.830072
> EOD
-7049825.31 -4677803.10
45036164.88 26747054.17
I am not sure what the results are. Are these x/y coordinates? And if so -
which set the upper or the lower.
#Joseph Norris (Perl - what else is there?/Linux/CGI/Mysql) print @c=map chr
$_+100,(6,17,15,16,-68,-3,10,11,16,4,1,14,-68,12,1,14,8,-68,4,-3,-1,7,1,14,-
68,-26,11,15,1,12,4,-68,-22,11,14,14,5,15,-90);
-----Original Message-----
From: UMN MapServer Users List [HYPERLINK
"mailto:MAPSERVER-USERS at lists.umn.edu"mailto:MAPSERVER-USERS at lists.umn.edu]O
n
Behalf Of Lawrence, Kevin
Sent: Wednesday, December 08, 2004 7:05 AM
To: MAPSERVER-USERS at lists.umn.edu
Subject: Re: [UMN_MAPSERVER-USERS] simple tool for conversion
proj - the same utility used for on the fly re-projection
one example
echo $lat $long | proj +proj=lcc +lon_0=95w +lat_0=0 +lat_1=49 +lat2=77 -r
project geographic to
lambert conformal
origin -95 0
1st parallel 49
2nd parallel 77
KL
> ----------
> From: UMN MapServer Users List[SMTP:MAPSERVER-USERS at LISTS.UMN.EDU]
> on behalf of Joseph Norris[SMTP:sirronj at PACBELL.NET]
> Reply To: Joseph Norris
> Sent: Wednesday, December 08, 2004 9:58 AM
> To: MAPSERVER-USERS at LISTS.UMN.EDU
> Subject: [UMN_MAPSERVER-USERS] simple tool for conversion
>
> Can anyone make a recommendation for unix command line tool that will
> convert lat/long to xy coordinates?
>
> Thanks.
>
> #Joseph Norris (Perl - what else is there?/Linux/CGI/Mysql) print @c=map
> chr
> $_+100,(6,17,15,16,-68,-3,10,11,16,4,1,14,-68,12,1,14,8,-68,4,-3,-1,7,1,14
> ,-
> 68,-26,11,15,1,12,4,-68,-22,11,14,14,5,15,-90);
>
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