<div dir="ltr"><div class="markdown-here-wrapper" style=""><p style="margin:0px 0px 1.2em!important">Hello Dmitry,</p>
<p style="margin:0px 0px 1.2em!important">I fixed the bug (I guess).<br>Now coming to my proposal for GSoC, So I was thinking of working on project #4 <b>Auto-detection of EPSG codes from incomplete WKT.</b></p>
<p style="margin:0px 0px 1.2em!important">What I understood from the project is that we need to predict the EPSG code of certain files on the basis of some attributes which are available in the file.</p>
<p style="margin:0px 0px 1.2em!important">The attributes can be extracted from the file for which I read <a href="http://www.gdal.org/osr_tutorial.html#querying_coordinate_system">this</a>.</p>
<p style="margin:0px 0px 1.2em!important">Now to solve this problem I thought a lot of methods but I think the best way to solve it will be using machine learning.</p>
<p style="margin:0px 0px 1.2em!important">The way ML will handle this problem is as follows-</p>
<ol style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px">We need to find the EPSG code for a file (testing data)</li>
<li style="margin:0.5em 0px">We have a file with some attributes (projections,datum,etc ).</li>
<li style="margin:0.5em 0px">We need to the guess the best suitable class for that file(EPSG)</li>
<li style="margin:0.5em 0px">Also, we have many files for which we know the attributes and the corresponding class (training data).</li>
</ol>
<p style="margin:0px 0px 1.2em!important">This problem is now translated into an ML problem which can be solved using the following models-</p><p style="margin:0px 0px 1.2em!important">1. <a href="https://en.wikipedia.org/wiki/Posterior_probability">Bayesian Stastics</a></p>
<p style="margin:0px 0px 1.2em!important"></p><div class="markdown-here-exclude"><p></p><blockquote style="margin:0 0 0 40px;border:none;padding:0px"><div>where,</div><div>posteriror probability = probability of this file have EPSG code 'a'.</div><div>prior probability = probability of occurence of EPSG code 'a'.</div></blockquote></div><div class="markdown-here-exclude"><blockquote style="margin:0 0 0 40px;border:none;padding:0px">likelihood probablity = cases where we saw such attributes when the EPSG code is 'a'.<br></blockquote><div class="markdown-here-exclude"><br></div>2. or we can use a simple knn where k is the number of possible EPSG code and the dimension of the feature vector is the number of possible attributes. we need to the find a valid and promising weight function).<br></div>
<p style="margin:0px 0px 1.2em!important"><br></p><p style="margin:0px 0px 1.2em!important">3. We can use multi-class SVM.</p><p style="margin:0px 0px 1.2em!important">4. any other suggestion from the community regarding the possible choice of the algo.</p>
<p style="margin:0px 0px 1.2em!important">I am thinking of actually implementing all these algo(may add algo in future depending upon the suggestion) and select the algo which gives the best performance among all of them.</p>
<p style="margin:0px 0px 1.2em!important">Please provide me feedback on my proposal and suggestion if I can add/change anything.<br>And since very less time is left in the deadline, I would like to convert it into proposal ASAP with your help.</p>
<p style="margin:0px 0px 1.2em!important">Regards,<br>Sarthak</p>
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aXY+PGRpdj5SZWdhcmRzLDwvZGl2PjxkaXY+U2FydGhhazwvZGl2Pg==" style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0"></div></div><div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Mar 22, 2016 at 8:09 PM, sarthak agarwal <span dir="ltr"><<a href="mailto:sarthak0415@gmail.com" target="_blank">sarthak0415@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><span class=""><p style="margin:0px 0px 1.2em!important">Hello Dmitry,<br></p><p style="margin:0px 0px 1.2em!important">I have made all the necessary changes and now the code is working as expected ie If we provide no dbname, it will take the username by default.<br></p></span><p style="margin:0px 0px 1.2em!important">Here is the <a href="https://github.com/OSGeo/gdal/commit/417f4ed2642c56729f93fdb959e2bf1b9f1fdfb1" target="_blank">https://github.com/OSGeo/gdal/commit/417f4ed2642c56729f93fdb959e2bf1b9f1fdfb1</a> to the fix.<br></p><p style="margin:0px 0px 1.2em!important">Regards,<br>Sarthak</p>
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<div text="#000000" bgcolor="#FFFFFF">
Hi Sarthak,<br>
<br>
The problem is here
<a href="https://github.com/sarthak-0415/gdal/blob/trunk/gdal/frmts/postgisraster/postgisrasterdriver.cpp#L78" target="_blank">https://github.com/sarthak-0415/gdal/blob/trunk/gdal/frmts/postgisraster/postgisrasterdriver.cpp#L78</a><br>
<br>
Your code produce situation there pszDbnameIn can be NULL. Before
your fixes, that cannot be.<br>
So the line "CPLString osKey = pszDbnameIn;" produces crash.<br>
<br>
Don't wait for anybody with proposal. The new GSoC site is right
place to discuss proposals. <br>
<pre cols="72">Best regards,
Dmitry</pre>
<div>20.03.2016 19:41, sarthak agarwal
пишет:<br>
</div><div><div>
<blockquote type="cite">
<div dir="ltr">
<div>
<p style="margin:0px 0px 1.2em!important">Hello to all,</p>
<p style="margin:0px 0px 1.2em!important">Sorry for taking too
long (exams and travelling).</p>
<p style="margin:0px 0px 1.2em!important">After running few
tests -</p>
<ul style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px">In my opinion, in Both the
codes the error is not in <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">GetConnectionInfo</code>
function. if you replace <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">return true</code>
with <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">return false</code>
at the last of the function it won’t fail in both cases.</li>
<li style="margin:0.5em 0px">If you run <a href="https://github.com/sarthak-0415/gdal/commit/3e037a84e3392841cda1b4b68d75d205118caa9d" target="_blank">this</a>
and <a href="https://github.com/sarthak-0415/gdal/commit/26e9383645b177c9e4d2ca8798a3b662901f3b63" target="_blank">this</a>
code, it won’t give you the error, the value passed here
are correct (NULL if that’s the case with <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">*ppszDbname</code>,
the error is somewhere else and I am not able to debug
it.)</li>
<li style="margin:0.5em 0px">When I am trying to configure
the gdal with <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">enable-debug</code>
options following error comes
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248);white-space:pre-wrap;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)">make[<span style="color:rgb(0,128,128)">1</span>]: *** [gdalserver] Error <span style="color:rgb(0,128,128)">1</span>
make[<span style="color:rgb(0,128,128)">1</span>]: *** Waiting <span style="color:rgb(51,51,51);font-weight:bold">for</span> unfinished jobs....
/home/sarthak/gsoc2016/repos/gdal/gdal/.libs/libgdal.so: undefined reference to `CPLMutexHolder::CPLMutexHolder(_CPLMutex**, double, char const*, int, int)<span style="color:rgb(221,17,68)">'
collect2: error: ld returned 1 exit status</span>
</code></pre>
</li>
</ul>
<p style="margin:0px 0px 1.2em!important">My current config
options are<br>
<code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">./configure --prefix=/home/sarthak/gsoc2016/repos/gdal/install/ --with-python=yes -enabl-debug=yes</code></p>
<p style="margin:0px 0px 1.2em!important">the following error
is for <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">gdalServer</code>
<code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">gdalInfo</code>
<code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">gdal_translate</code>
and <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">gdaladdo</code>.
All are having the same problem with <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">undefined reference to `CPLMutexHolder::CPLMutexHolder(_CPLMutex**, double, char const*, int, int)'</code></p>
<p style="margin:0px 0px 1.2em!important">Please review the
code and send me the feedback.<br>
Also, I would like to continue with the bug along with my
GSoC proposal. For which I may have some ideas and would
like to discuss the same with you.. can we talk on IRC since
the deadline is in 5 days only.</p>
<p style="margin:0px 0px 1.2em!important">Regards,<br>
Sarthak</p>
<p style="margin:0px 0px 1.2em!important">On Wed, Mar 16, 2016
at 4:51 AM, Dmitry Baryshnikov <<a href="mailto:bishop.dev@gmail.com" target="_blank">bishop.dev@gmail.com</a>>
wrote:</p>
<div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div bgcolor="#FFFFFF"><span> Hi Sarthak,<br>
<br>
The first version is not working (do you test it?): <a href="https://github.com/sarthak-0415/gdal/commit/36344cc26f23202cb289390322c1d295697136bd#diff-31df0e62d00ca09f9f11ad2f29e94b54R2541" target="_blank"></a><a href="https://github.com/sarthak-0415/gdal/commit/36344cc26f23202cb289390322c1d295697136bd#diff-31df0e62d00ca09f9f11ad2f29e94b54R2541" target="_blank">https://github.com/sarthak-0415/gdal/commit/36344cc26f23202cb289390322c1d295697136bd#diff-31df0e62d00ca09f9f11ad2f29e94b54R2541</a><br>
Here you try to get array value with index -1. You
need to set <span>ppszDbname = NULL no DB name
present in input parameters.<br>
<br>
The second variant is not working too:<br>
>>> ds = gdal.Open('PG:')<br>
terminate called after throwing an instance of
'std::logic_error'<br>
what(): basic_string::_M_construct null not valid<br>
<br>
In both cases there is a problem here: <a href="https://github.com/sarthak-0415/gdal/blob/6264d3fc52242fdce858547cc3a0312b04fd638b/gdal/frmts/postgisraster/postgisrasterdataset.cpp#L2743" target="_blank"></a><a href="https://github.com/sarthak-0415/gdal/blob/6264d3fc52242fdce858547cc3a0312b04fd638b/gdal/frmts/postgisraster/postgisrasterdataset.cpp#L2743" target="_blank">https://github.com/sarthak-0415/gdal/blob/6264d3fc52242fdce858547cc3a0312b04fd638b/gdal/frmts/postgisraster/postgisrasterdataset.cpp#L2743</a><br>
<br>
Also look there </span><span>ppszDbname is using,
as before modifications the </span><span>code
expect that ppszDbname cannot be NULL.<br>
</span>
<pre cols="72">Best regards,
Dmitry</pre>
<div>15.03.2016 13:13, sarthak agarwal пишет:<br>
</div>
</span>
<blockquote type="cite">
<div dir="ltr">
<div>
<p style="margin:0px 0px 1.2em!important">Hey
Dmitry ,<span><br>
As discussed on the IRC yesterday,<br>
I made the changes in the code.</span></p>
<span>
<p style="margin:0px 0px 1.2em!important">I
build two versions of the code</p>
<ol style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px">
<p style="margin:0.5em 0px!important">The
changes suggested by you (to use the old
trunk code and remove the additional
checks) <a href="https://github.com/sarthak-0415/gdal/commit/36344cc26f23202cb289390322c1d295697136bd" target="_blank">link</a>
<a href="https://travis-ci.org/sarthak-0415/gdal/builds/116070409" target="_blank">travis</a>
.<br>
a. in this version the Dbname is left
empty if not provided by the user.</p>
</li>
<li style="margin:0.5em 0px">
<p style="margin:0.5em 0px!important">The
version in which we<br>
a. if the Dbname is provided by the user
then ppzDbname=Dbname.<br>
b. else use the psql env var PGDATABASE<br>
c. else use the Username as the database
name.<br>
d. if nothing is available then pass empty
string.<br>
e <a href="https://github.com/sarthak-0415/gdal/commit/6264d3fc52242fdce858547cc3a0312b04fd638b" target="_blank">link</a>
<a href="https://travis-ci.org/sarthak-0415/gdal/builds/116055868" target="_blank">travis</a></p>
</li>
</ol>
<p style="margin:0px 0px 1.2em!important">I
think both version should work</p>
<p style="margin:0px 0px 1.2em!important">Regards,<br>
Sarthak</p>
</span></div>
</div>
</blockquote>
</div>
</blockquote>
</div>
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</div>
</div>
</blockquote>
<br>
</div></div></div>
</blockquote></div><br></div>
</div></div></blockquote></div><br></div>