Re: Ilwis Digest, Vol 71, Issue 6

classic Classic list List threaded Threaded
1 message Options
Reply | Threaded
Open this post in threaded view
|

Re: Ilwis Digest, Vol 71, Issue 6

Felipe Geologia
Hi,
I'm Felipe, a undergraduate student in geology at the University of Vale do Rio dos Sinos (UNISINOS), São Leopoldo Brazil.

I use the ILWIS in the discipline of Remote Sensing, increasingly discover the thousand and one uses this program.

Here I suggest everyone when they pass your suggestions to deal with the ILWIS, recommend copying the steps on how to proceed in the form of figures and leave the steps in Word and save as PDF, thus greatly facilitate the comprehension.

suggestion:

1) Step:
  Save figures as the steps for the solution procedure of doubt using the ILWIS;

2) Step:
Putting the figures of the steps in Word

3) Step:
Save these steps that are in Word PDF (Facilitates opening File)

I suggest that, using this methodology due to be me and be facilitating and stimulating the use of the program!

hug
Felipe
Undergraduation in Geology
University of Vale do Rio dos Sinos


2013/5/28 <[hidden email]>
Send Ilwis mailing list submissions to
        [hidden email]

To subscribe or unsubscribe via the World Wide Web, visit
        http://list.52north.org/mailman/listinfo/ilwis
or, via email, send a message with subject or body 'help' to
        [hidden email]

You can reach the person managing the list at
        [hidden email]

When replying, please edit your Subject line so it is more specific
than "Re: Contents of Ilwis digest..."


Today's Topics:

   1. IMAGE CLASSIFICATION (mavis chisha)
   2. Re: IMAGE CLASSIFICATION (Bas Retsios)
   3. Re: IMAGE CLASSIFICATION (Bas Retsios)


----------------------------------------------------------------------

Message: 1
Date: Mon, 27 May 2013 12:10:04 +0100 (BST)
From: mavis chisha <[hidden email]>
To: [hidden email]
Subject: [Ilwis] IMAGE CLASSIFICATION
Message-ID:
        <[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"

Thank you very much for your reply.
?
However, i think the problem is on the import type.? I am importing the images using GEO TIFF but when it comes to creating a sample set,? it is not bringing the image domain for selection in order to create the classess.? When you comand the create button,? it tells you that "not a valid domain.? only image domain allowed".? Unfortunately even when selecting from the available domains,? the image domain is not appearing.?
?
I believe there could be another way of creating this image domain that the process will?recognise.
?
I need help on this.
?
Kind regards
?
Mavis
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.52north.org/pipermail/ilwis/attachments/20130527/14dca365/attachment-0001.html>

------------------------------

Message: 2
Date: Mon, 27 May 2013 15:06:31 +0200
From: Bas Retsios <[hidden email]>
To: mavis chisha <[hidden email]>
Cc: [hidden email]
Subject: Re: [Ilwis] IMAGE CLASSIFICATION
Message-ID: <[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"

Hello,

If you happen to have a "value" map and simply need to convert it to an
"image" map, just to make one of the ILWIS applications happy, let ILWIS
make a copy of the map with the correct domain.
Assumption: your map's filename is mymap.mpr, and its domain is "value"
or similar (thus not "class" or "id" or "bool").
1. In the ILWIS command-line, type the formula output_map := mymap
2. The "Raster Map Definition" form will pop-up. In this form, focus on
the Domain option. By default it is the same as the source-map. Change
this to IMAGE. Note that the value-range and the precision changes.
3. Click OK. The map "output_map.mpr" now has the values of mymap.mpr,
and Domain "image".
If you need some scaling/offsetting, e.g. to maximize the limited
precision of the IMAGE domain, or to scale the map to match the value
range of other maps, take care of that in the formula at (1).
E.g. if the values of mymap.mpr are between 0 and 1, and you would want
to maximize the precision of domain IMAGE, multiply the map by 255:
output_map := 255 * mymap

Cheers,

Bas.


On 5/27/2013 13:10, mavis chisha wrote:
> Thank you very much for your reply.
> However, i think the problem is on the import type. I am importing the
> images using GEO TIFF but when it comes to creating a sample set,  it
> is not bringing the image domain for selection in order to create the
> classess.  When you comand the create button,  it tells you that "not
> a valid domain.  only image domain allowed".  Unfortunately even when
> selecting from the available domains,  the image domain is not appearing.
> I believe there could be another way of creating this image domain
> that the process will recognise.
> I need help on this.
> Kind regards
> Mavis
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.52north.org/pipermail/ilwis/attachments/20130527/98b7fb3c/attachment-0001.html>

------------------------------

Message: 3
Date: Mon, 27 May 2013 16:25:58 +0200
From: Bas Retsios <[hidden email]>
To: mavis chisha <[hidden email]>, "[hidden email]"
        <[hidden email]>
Subject: Re: [Ilwis] IMAGE CLASSIFICATION
Message-ID: <[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"

Hello,

Yes, the ILWIS command-line formula for generating new maps has two options:

1. a Definition symbol =
2. an Assignment symbol :=

 From the ILWIS Help:

############################
By using the defintion symbol =, a dependent output map or a dependent
output column will be created.

By using the assignment symbol :=, an editable map or column will be
created. Dependency links are immediately broken after the output map or
the output column has been calculated.

A dependent map or a dependent column has the following advantageous
characteristics:
the formula/expression by which the map or column was created is stored
(this is also called the definition of a map or column),
the formula/expression by which the output map or column was created can
be changed/edited,
a series of dependent maps or columns can be recalculated/made
up-to-date, when a single definition or a single input map or column has
changed.
############################

In the example, I have used the assignment symbol := because then the
result is "editable", thus you could e.g. change its georeference if
needed .. also in many other cases the result it is simpler to use (e.g.
copying it to another folder).

Cheers,

Bas.


On 5/27/2013 16:00, mavis chisha wrote:
> Dear Bas Retsios,
>
> Thank you very much for this valuable information. I will try it right
> away.
>
> However,  i notice that you are adding full colons (:) when typing the
> command expressions.  Are they part of the expressions as well?
>
> Kind regards,
>
> Mavis
>
> --- On *Mon, 27/5/13, Bas Retsios /<[hidden email]>/* wrote:
>
>
>     From: Bas Retsios <[hidden email]>
>     Subject: Re: [Ilwis] IMAGE CLASSIFICATION
>     To: "mavis chisha" <[hidden email]>
>     Cc: [hidden email]
>     Date: Monday, 27 May, 2013, 16:06
>
>     Hello,
>
>     If you happen to have a "value" map and simply need to convert it
>     to an "image" map, just to make one of the ILWIS applications
>     happy, let ILWIS make a copy of the map with the correct domain.
>     Assumption: your map's filename is mymap.mpr, and its domain is
>     "value" or similar (thus not "class" or "id" or "bool").
>     1. In the ILWIS command-line, type the formula output_map := mymap
>     2. The "Raster Map Definition" form will pop-up. In this form,
>     focus on the Domain option. By default it is the same as the
>     source-map. Change this to IMAGE. Note that the value-range and
>     the precision changes.
>     3. Click OK. The map "output_map.mpr" now has the values of
>     mymap.mpr, and Domain "image".
>     If you need some scaling/offsetting, e.g. to maximize the limited
>     precision of the IMAGE domain, or to scale the map to match the
>     value range of other maps, take care of that in the formula at (1).
>     E.g. if the values of mymap.mpr are between 0 and 1, and you would
>     want to maximize the precision of domain IMAGE, multiply the map
>     by 255:
>     output_map := 255 * mymap
>
>     Cheers,
>
>     Bas.
>
>
>     On 5/27/2013 13:10, mavis chisha wrote:
>>     Thank you very much for your reply.
>>     However, i think the problem is on the import type.  I am
>>     importing the images using GEO TIFF but when it comes to creating
>>     a sample set,  it is not bringing the image domain for selection
>>     in order to create the classess.  When you comand the create
>>     button,  it tells you that "not a valid domain.  only image
>>     domain allowed".  Unfortunately even when selecting from the
>>     available domains,  the image domain is not appearing.
>>     I believe there could be another way of creating this image
>>     domain that the process will recognise.
>>     I need help on this.
>>     Kind regards
>>     Mavis
>>
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.52north.org/pipermail/ilwis/attachments/20130527/cf58f167/attachment-0001.html>

------------------------------

_______________________________________________
Ilwis mailing list
[hidden email]
http://list.52north.org/mailman/listinfo/ilwis


End of Ilwis Digest, Vol 71, Issue 6
************************************


_______________________________________________
Ilwis mailing list
[hidden email]
http://list.52north.org/mailman/listinfo/ilwis
http://ilwis.forum.52north.org