Re: [Qgis-developer] Raster to Vector conversion

[Sai Harsh Tondomker]

Thanks, Jorge,
For your valuable reply. Can you suggest some algorithm that I can start
implementing as I have some basic knowledge of OpenCV.

Awaiting for your positive response.

Thanks & Regards,
Harsh



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On Thu, Apr 13, 2017 at 1:18 PM, Jorge Gustavo Rocha <j...@di.uminho.pt>
wrote:

> Hi Sai Harsh,
>
> I would start by learning OpenCV [1]. OpenCV is a sophisticated image
> processing library with Python bindings you can use with QGIS. You can
> write your own algorithm to isolate the roads. Search the web for object
> detection and classification examples.
> Machine learning is probably the best approach. You have already images
> with roads, so you have many examples for machine learning (positive
> cases). So, after playing with OpenCV, look for machine learning (with
> OpenCV).
>
> Regards,
>
> Jorge Gustavo
>
> [1] http://opencv.org/
>
> Às 06:58 de 13-04-2017, Sai Harsh Tondomker escreveu:
> > Dear All,
> > I am Sai Harsh, an UG student in IIIT-Chittoor, India.
> >
> > I want to convert raster image to vector shape layer. I knew that in
> > qgis this feature already exists but it's limited.
> >
> > Let us suppose If one google roadmap image is given as an input, after
> > converting it into vector shape layer(using the existing conversion), I
> > would like to highlight one road line(manually using attribute table)
> > but it's not working. correct me if I am wrong.
> >
> > Can anyone suggest me how I need to proceed?
> >
> > I know there should be some image processing algorithm need to be
> > applied, then followed by converting it into vector layer format.
> >
> > Which image processing algorithm I need to apply to get good accuracy?
> >
> > Awaiting for a positive response.
> >
> > Best Regards,
> > Harsh
> > IIIT-Chittoor
> >
> >
> >
> >
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> referral=saiharsh@iiits.in=22>
> >
> > <#>
> >
> >
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>
> J. Gustavo
> --
> Jorge Gustavo Rocha
> Departamento de Informática
> Universidade do Minho
> 4710-057 Braga
> Tel: +351 253604480
> Fax: +351 253604471
> Móvel: +351 910333888
> skype: nabocudnosor
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[Qgis-developer] Raster to Vector conversion

[Sai Harsh Tondomker]

Dear All,
I am Sai Harsh, an UG student in IIIT-Chittoor, India.

I want to convert raster image to vector shape layer. I knew that in
qgis this feature already exists but it's limited.

Let us suppose If one google roadmap image is given as an input, after
converting it into vector shape layer(using the existing conversion), I
would like to highlight one road line(manually using attribute table) but
it's not working. correct me if I am wrong.

Can anyone suggest me how I need to proceed?

I know there should be some image processing algorithm need to be applied,
then followed by converting it into vector layer format.

Which image processing algorithm I need to apply to get good accuracy?

Awaiting for a positive response.

Best Regards,
Harsh
IIIT-Chittoor




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[Qgis-developer] Raster to Vector shape layer conversion

[Sai Harsh Tondomker]

Dear All,
I am Sai Harsh, an UG student in IIIT-Chittoor, India.

I want to convert raster image to vector shape layer. I knew that in
qgis this feature already exists but it's limited.

Let us suppose If one google roadmap image is given as an input, after
converting it into vector shape layer(using the existing conversion), I
would like to highlight one road line(manually using attribute table) but
it's not working. correct me if I am wrong.

Can anyone suggest me how I need to proceed?

I know there should be some image processing algorithm need to be applied,
then followed by converting it into vector layer format.

Which image processing algorithm I need to apply to get good accuracy?

Awaiting for a positive response.

Best Regards,
Harsh
IIIT-Chittoor



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[Qgis-developer] GSOC idea

[Sai Harsh Tondomker]

Dear All,

I am working on "implementation of algorithmic graph theory" from past 2
years +.

The following feature is not present in qgis and this features will
encourage many researchers to use qgis for experimental results.

1. Generating graph data-structure from OSM data for a selected polygon.
The data-structure can be

   - Edge stream representation
   - CSR(Compressed Sparse Row)(Popular one)
   - Adjacency list and matrix

If this kind of representation is available many graph algorithms will be
tested like A*, Dijkstra's, Ear decomposition etc

There can be variable components on each edge value like for some
algorithms each edge will have only one value like distance. for some
algorithms, each edge will have more than one value like [time, distance].

2. Finding k landmarks in input map is also a good problem.


Please let me know whether it's a good idea to work on.

Awaiting for a positive response.

Best Regards,
Harsh
B.Tech(Hons in CS)
IIIT-Sri City



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Re: [Qgis-developer] GSOC project idea

[Sai Harsh Tondomker]

Hi All,
I am Sai Harsh from IIIT-Sri City, I have been using QGIS from past 8
months, I am good at Python and C++ programming apart from this I have
2-year research experience in implementation of algorithmic graph theory.

Here I attach the project write-up, please suggest me whether it's a good
project for GSOC.

Please Clickhere
<https://docs.google.com/document/d/1X05d34UCJnuRXvBl_ztbGpLyRZk2TuLBJMbMBRBGBWA/edit?usp=sharing>to
give comment on the write-up,

Awaiting for the response.

Thanks & Regards,
Harsh




On Tue, Mar 21, 2017 at 10:46 AM, Sai Harsh Tondomker <saiharsh@iiits.in
> wrote:

> Hi Nyall,
> Thanks for your valuable reply.
> I will try to complete the project write-up(1-2 pages and with some
> additional features) within 2 days.
>
> Thanks & Regards,
> Harsh
>
>
>
>
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>
> On Tue, Mar 21, 2017 at 3:44 AM, Nyall Dawson <nyall.daw...@gmail.com>
> wrote:
>
>> Hi Sai!
>>
>> Thanks for raising interested in this - we'd love to have more GSOC
>> candidates for the project!
>>
>> Some specific comments inline below:
>>
>> On 21 March 2017 at 06:03, Sai Harsh Tondomker <saiharsh@iiits.in>
>> wrote:>
>> > 1. Without restarting qgis, it will display the newly added plugin.
>> best of my knowledge this feature is not present in qgis.
>>
>> That's already present if plugins are installed using the plugin
>> installer. The master version of the installer also allows
>> installation of offline plugin zips, which will immediately be loaded
>> without restart.
>>
>> > 2.Let us suppose if in a .csv file we have lat, long column, when it's
>> uploaded to qgis it will mark all the places which this lat & long is
>> representing.(If user needs it), it's useful because lat & long are used
>> quite often.
>>
>> That's also already present, using either the delimited text provider
>> or the OGR provider.
>>
>> > 4. Qgis to support Python 3 without breaking python 2.
>>
>> We've made the decision that QGIS 3.0 is when we break API and move to
>> Python 3 only. We won't accept backward compatibility here as it gets
>> very tricky with our various dependencies, especially PyQt. So the
>> master branch is now fully Python 3 and does not support Python 2.
>>
>> > 3. While uploading the .csv file (in which duplicate names exist) to
>> merge with attribute table in qgis, the duplicates can be merge depending
>> on the formula applied, this feature is not present in qgis.
>>
>> This sounds interesting! We could certainly benefit a lot from both
>> greater power available through joins and relations, and also
>> duplicate management is quite poor in QGIS. I'd suggest the second
>> half of this (duplicate management) could be a great project to
>> explore.
>>
>> Nyall
>>
>
>
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Re: [Qgis-developer] GSOC project idea

[Sai Harsh Tondomker]

Hi Nyall,
Thanks for your valuable reply.
I will try to complete the project write-up(1-2 pages and with some
additional features) within 2 days.

Thanks & Regards,
Harsh




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On Tue, Mar 21, 2017 at 3:44 AM, Nyall Dawson <nyall.daw...@gmail.com>
wrote:

> Hi Sai!
>
> Thanks for raising interested in this - we'd love to have more GSOC
> candidates for the project!
>
> Some specific comments inline below:
>
> On 21 March 2017 at 06:03, Sai Harsh Tondomker <saiharsh@iiits.in>
> wrote:>
> > 1. Without restarting qgis, it will display the newly added plugin. best
> of my knowledge this feature is not present in qgis.
>
> That's already present if plugins are installed using the plugin
> installer. The master version of the installer also allows
> installation of offline plugin zips, which will immediately be loaded
> without restart.
>
> > 2.Let us suppose if in a .csv file we have lat, long column, when it's
> uploaded to qgis it will mark all the places which this lat & long is
> representing.(If user needs it), it's useful because lat & long are used
> quite often.
>
> That's also already present, using either the delimited text provider
> or the OGR provider.
>
> > 4. Qgis to support Python 3 without breaking python 2.
>
> We've made the decision that QGIS 3.0 is when we break API and move to
> Python 3 only. We won't accept backward compatibility here as it gets
> very tricky with our various dependencies, especially PyQt. So the
> master branch is now fully Python 3 and does not support Python 2.
>
> > 3. While uploading the .csv file (in which duplicate names exist) to
> merge with attribute table in qgis, the duplicates can be merge depending
> on the formula applied, this feature is not present in qgis.
>
> This sounds interesting! We could certainly benefit a lot from both
> greater power available through joins and relations, and also
> duplicate management is quite poor in QGIS. I'd suggest the second
> half of this (duplicate management) could be a great project to
> explore.
>
> Nyall
>
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[Qgis-developer] GSOC project idea

[Sai Harsh Tondomker]

Dear all,
I am Sai Harsh from India, from past 8 months, I am using QGIS.
These are the things I am thinking to add in qgis.
1. Without restarting qgis, it will display the newly added plugin. best of
my knowledge this feature is not present in qgis.
2.Let us suppose if in a .csv file we have lat, long column, when it's
uploaded to qgis it will mark all the places which this lat & long is
representing.(If user needs it), it's useful because lat & long are used
quite often.
3. While uploading the .csv file (in which duplicate names exist) to merge
with attribute table in qgis, the duplicates can be merge depending on the
formula applied, this feature is not present in qgis.
4. Qgis to support Python 3 without breaking python 2.

Please suggest whether it's a good project to work on.

Awaiting for a positive response.

Thanks & Regards,
Harsh
IIIT-Sri City
















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[Qgis-developer] Query

[Sai Harsh Tondomker]

Hi All,
I am Sai Harsh from India. I am using QGIS from past 8 months.
I want to know is the new QGIS supports both Python 3 and Python 2?
Can I install plugin after building it without restarting qgis?.(the new
plugin is stored in ../python/plugin)
If I install QGIS do I need to install plugin builder separately?

Thanks & Regards,
Sai Harsh
IIIT-Sri City, Chittoor, India



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