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Hi,<br>
I am not sure what you mean about the second part of your question.
Can you add a screen shot with more details? (You may have to add a
nodata value to the raster to reset the scale.)<br>
<br>
As for the first part, if you use and interpolation method with, for
example a 3 meter search radius, then you will most likely finish
with a raster that is 3m. wider on all sides. If your area is a
square or a rectangle, then you can select an x min, x max, y min,
ymax (Raster/ Interporlation Plugin). If you are using Gdall_Grid
(Raster/analysis/Grid) you can manually add the same bounding box
extant (<a class="moz-txt-link-freetext" href="http://www.gdal.org/gdal_grid.html" target="_top" rel="nofollow" link="external">http://www.gdal.org/gdal_grid.html</a>) with the -txe and -tye
configurations. Click on the yellow pen and on the Help button for
more information. You can also use the Clipper tool
(raster/extraction/clipper).<br>
<br>
If your area boundary is not square, you can manually cut back the
raster by using the following method.<br>
1: Creating a mask:<br>
- Create a new polygon vector file with a new field that will
receive 1 and 0. You will have to create a polygon with the area
you what to keep (1) and for areas you need to cut (0)<br>
- Can use tools like "vector/research tools/polygon from layer
extent" to help out.<br>
- convert the vector to a raster (same size and resolution as your
interpolated result) "raster/conversion/vector to raster"<br>
<br>
2: Use the Clipper tool or simple raster math to clip the extant by
multiplying both rasters. Area with "0" will be set to "0" and Area
with "1" will keep there values. You may have to add no value data
to make it work "right click on layer/ save raster layer as/ No data
values..."<br>
<br>
Hope this helps.<br>
Nicolas <br>
<br>
<br>
<br>
<div class="moz-cite-prefix">Le 2015-04-29 03:50, Suvendu Roy [via
OSGeo.org] a écrit :<br>
</div>
<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em'
cite="mid:CAD_6Gu63pijgCEMwUpjk7j-apTHyyqUGB+bTCkvCnBN6L06bdg@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_default"
style="font-family:verdana,sans-serif">Respected User of
Q-GIS,</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif">I have an question on
image clipping of an interpolation map.</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif">After prepare an
interpolation map using point vector, the extension of
interpolated result cross the study area boundary, even
though, the sample points are within the study area. </div>
<div class="gmail_default"
style="font-family:verdana,sans-serif">Please help me to guide
to prepare an interpolation map, which should be restricted
within the study area only, not fill the outside also.</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif">In the same map, when i
use IDW interpolation method, in the legend the range value of
the original attribute also changes (become low), how can i
solve all these problem? </div>
</div>
<div class="gmail_extra"><br clear="all">
<div>
<div class="gmail_signature">
<div dir="ltr"><i><font color="#3366ff"><b><span
style="font-family:georgia,serif">Suvendu Roy</span></b><br>
Junior Research Fellow-UGC, </font></i>
<div><i><font color="#3366ff">Department of Geography,
University of Kalyani, </font></i></div>
<div><i><font color="#3366ff">Kalyani, Nadia-741235</font></i></div>
<div><i><font color="#3366ff">Alternative Mail Id: <a
moz-do-not-send="true"
href="/user/SendEmail.jtp?type=node&node=5203411&i=0"
target="_top" rel="nofollow" link="external">[hidden
email]</a><br>
Mob. +91 9153128612</font></i><br>
</div>
</div>
</div>
</div>
<br>
<div class="gmail_quote">On Tue, Mar 31, 2015 at 4:02 PM,
Suvendu Roy <span dir="ltr"><<a moz-do-not-send="true"
href="/user/SendEmail.jtp?type=node&node=5203411&i=1"
target="_top" rel="nofollow" link="external">[hidden
email]</a>></span> wrote:<br>
<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' style="border-left:2px solid #CCCCCC;padding:0
1em" class="gmail_quote"><span class="">
<div dir="ltr"><span style="font-size:12.8000001907349px">Respected
User,</span>
<div style="font-size:12.8000001907349px">Is the full
version of HEC-GeoRAS can be patched with the Qgis,
present, Q-RAS help to get cross-section data, but it
can't export the modeled data to the GIS for
floodplain mapping.</div>
</div>
</span>
<div class="gmail_extra"><br clear="all">
<span class="">
<div>
<div>
<div dir="ltr"><i><font color="#3366ff"><b><span
style="font-family:georgia,serif">Suvendu
Roy</span></b><br>
Junior Research Fellow-UGC, </font></i>
<div><i><font color="#3366ff">Department of
Geography, University of Kalyani, </font></i></div>
<div><i><font color="#3366ff">Kalyani,
Nadia-741235</font></i></div>
<div><i><font color="#3366ff">Alternative Mail Id:
<a moz-do-not-send="true"
href="/user/SendEmail.jtp?type=node&node=5203411&i=2"
target="_top" rel="nofollow" link="external">[hidden email]</a><br>
Mob. +91 9153128612</font></i><br>
</div>
</div>
</div>
</div>
<br>
</span>
<div>
<div class="h5">
<div class="gmail_quote">On Tue, Mar 10, 2015 at 3:51
PM, Suvendu Roy <span dir="ltr"><<a
moz-do-not-send="true"
href="/user/SendEmail.jtp?type=node&node=5203411&i=3"
target="_top" rel="nofollow" link="external">[hidden
email]</a>></span> wrote:<br>
<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' style="border-left:2px solid
#CCCCCC;padding:0 1em" class="gmail_quote">
<div dir="ltr"><span
style="color:rgb(74,74,75);font-family:'Segoe
UI',Arial,Verdana,Helvetica,sans-serif;font-size:13px;line-height:18px;white-space:pre-wrap">Dear
Q-GIS users,
I want to work on "image to image"
geo-referencing e.g. ASTER to Topographical
Sheet) for my research work, but </span><span
style="color:rgb(74,74,75);font-family:'Segoe
UI',Arial,Verdana,Helvetica,sans-serif;font-size:13px;line-height:18px;white-space:pre-wrap">I</span><span
style="color:rgb(74,74,75);font-family:'Segoe
UI',Arial,Verdana,Helvetica,sans-serif;font-size:13px;line-height:18px;white-space:pre-wrap">
cant's get the option for it.
Actually, I have an ASTER DEM image and </span><span
style="color:rgb(74,74,75);font-family:'Segoe
UI',Arial,Verdana,Helvetica,sans-serif;font-size:13px;line-height:18px;white-space:pre-wrap">I</span><span
style="color:rgb(74,74,75);font-family:'Segoe
UI',Arial,Verdana,Helvetica,sans-serif;font-size:13px;line-height:18px;white-space:pre-wrap">
want to register it </span><span
style="color:rgb(74,74,75);font-family:'Segoe
UI',Arial,Verdana,Helvetica,sans-serif;font-size:13px;line-height:18px;white-space:pre-wrap">according
to my</span><span
style="color:rgb(74,74,75);font-family:'Segoe
UI',Arial,Verdana,Helvetica,sans-serif;font-size:13px;line-height:18px;white-space:pre-wrap">
base map. Please guide me for it.
Thank You in advanced.</span><span><font
color="#888888"><br clear="all">
<div>
<div>
<div dir="ltr"><i><font color="#3366ff"><b><span
style="font-family:georgia,serif">Suvendu Roy</span></b><br>
Junior Research Fellow-UGC, </font></i>
<div><i><font color="#3366ff">Department
of Geography, University of
Kalyani, </font></i></div>
<div><i><font color="#3366ff">Kalyani,
Nadia-741235</font></i></div>
<div><i><font color="#3366ff">Alternative
Mail Id: <a
moz-do-not-send="true"
href="/user/SendEmail.jtp?type=node&node=5203411&i=4"
target="_top" rel="nofollow" link="external">[hidden email]</a><br>
Mob. +91 9153128612</font></i><br>
</div>
</div>
</div>
</div>
</font></span></div>
</blockquote>
</div>
<br>
</div>
</div>
</div>
</blockquote>
</div>
<br>
</div>
<br>
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