On 25 May 2010 19:11, Simone Giannecchini wrote:
>
> I would not mix up reprojection with resampling. I would do what follows:
>
> - if you are upsampling, first reproject than upsample
> - if you are downsampling, first downsample then reproject.
>
Hi Simone,
Since the operator allows users to r
performance
---
Ing. Simone Giannecchini
GeoSolutions S.A.S.
Founder - Software Engineer
Via Carignoni 51
55041 Camaiore (LU)
Italy
phone: +39 0584983027
fax: +39 0584983027
mob:+39 333 8128928
http://www.geo-solutions.it
http://geo-s
hey simone,
thanks for your super fast answer.
>- if you are upsampling, first reproject than upsample
>- if you are downsampling, first downsample then reproject.
what are the reasons for that different orders? can you tell me?
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Ciao Adnila,
please read below
---
Ing. Simone Giannecchini
GeoSolutions S.A.S.
Founder - Software Engineer
Via Carignoni 51
55041 Camaiore (LU)
Italy
phone: +39 0584983027
fax: +39 0584983027
mob:+39 333 8128928
http://www.geo-so
hey guys,
can somebody give a tipp concerning resampling and reprojecting in one
process? ^^
The coordinate reference system in combination with resampling is not
working?
Whats wrong?
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hey guys,
I still have some problems, can you help?
> GridEnvelope2D newGEnv = new GridEnvelope2D(0, 0, xDim, yDim);
why is it zero? and not curGridEnv.x/curGridEnv.y?
I have the following code snippet now:
// initialize new processor and parameters
crs = new CoordReferSyst();
Hi Jon, Linda,
Yep, it sounds like you're both on the road to grid coverage happiness now :)
Linda: for any desired cell width you can easily calculate the bits
you need for the new GridGeometry2D object to pass to the Resample
op...
double cellSize = ...
GridGeometry2D gg = cov.getGridGeometry
I suppose you just find the ratio between the current cell size and the cell
size you require, then use that for the scale factor. Or something like that
anyway...
Jon
On 20 May 2010 17:30, Adnila wrote:
>
> hey guys,
>
> @Michael: thanks for the code. It was very helpful. You're the best ;-)
>
hey guys,
@Michael: thanks for the code. It was very helpful. You're the best ;-)
sry, when I caused some confusions. But I meant the cell width with
resolution. This was not correct, sry. I need to set the cell width fixed.
The user can chose the cell width in meters and than the new grid cover
Hi Michael,
This certainly answers my question, now I can do things the GeoTools way!
Again, if you want a fixed resolution (say 800 x 600), since we're using
scaling factors then the following should do the trick:
// create new GridGeometry with half as many cells
GridEnvelope2D newGridEnv = ne
Hi Linda, Jon,
Sorry - didn't realize you were still stuck ! I hadn't been following
the last few messages on this thread.
If what you want to do is retain the coverage's world bounds but alter
its resolution (ie. its grid bounds) you can do as in the code snippet
below. Note that I'm not reproj
Are you saying you want to make an image a given resolution, as in 800 x
600? For this I use the following method:
public static RenderedImage rescale(RenderedImage image, int width,
int height) {
float xScale = (float) width / (float) image.getWidth();
float yScale = (float) height / (float) im
hey guys,
I still do not get it. can anybody help me please?
here is my original post:
Hey all,
now I am trying to use a fixed resolution for a rescaling of a
gridcoverage2D.
The user should be able to choose a resolution from a GUI.
What am I supposed to do if I want the rescaling with a fixed
Can you go through the ImageLab example? It should allow you to display
something on the screen?
You can use the same approach to make a MapContext that displays the image at
the scale/resolution you desire.
You can save the resulting image out.
This is not recommended; the idea of resampling to
I do not get what you mean.
Can you explain it a little bit more. I am not such an expert with
programming. That is why I am overwhelmed by your answer.
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Can you try cheating; setting up a rendering pipeline to render the coverage
out at the requested scale; and then sample the resulting image?
Jody
On 06/05/2010, at 9:00 PM, Simone Giannecchini wrote:
> Ciao Linda,
>
> if you want to change the resolution of a gridcoverage you need to
> impose
hey guys,
I really do need some help.
Is there anybody for helping me with this stupid rescale problem of
gridcoverages?
I do not get it fixed!
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Sent from
hey, what about the original topic? It seems that there is a strayed topic in
here.
does anybody have any idea how to solve the problem with rescaling a
gridcoverage2D.
thanks in advance.
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hey,
unfortunately it is not working. The result looks like this: (the given
resolution was 100m)
0.0, 0.0, 0.0
100.0, 0.0, 0.0
200.0, 0.0, 0.0
300.0, 0.0, 0.0
400.0, 0.0, 0.0
before the resampling it looked like this:
4610500.0, 5675000.0, -5.2
4611500.0, 5675000.0, -5.3
4612500.0, 5675000.0
Ciao Linda,
if you want to change the resolution of a gridcoverage you need to
impose it using the resample operation..
On geotools trunk, I have put together this snippet:
final double scaleX = 500;
final double scaleY = 1000;
final AffineTransform at =
AffineTransform.
hey,
yes I saw this operation. But I do not really get how to manipulate the
parameters to change resolution. It is always a little bit difficult to put
everything together without some code snippets. Is there any example of
changing resolution? I have to use real world units for the resolution f
Hi Linda,
Have you seen the Resample operation ? You can control the resolution
and the CRS...
http://geotools.org/javadocs/org/geotools/coverage/processing/operation/Resample.html
Michael
--
__
hey,
> When you say rescale do you mean that you want to resample an existing
> grid coverage at a new resolution or simply change the stated
> resolution of the coverage without modifying its data ?
I meant the first case: I want to resample an existing grid coverage at a
new resolution with a n
Hi Linda,
When you say rescale do you mean that you want to resample an existing
grid coverage at a new resolution or simply change the stated
resolution of the coverage without modifying its data ?
Michael
On 5 May 2010 23:29, Adnila wrote:
>
> Hey all,
> now I am trying to use a fixed resolu
Hey all,
now I am trying to use a fixed resolution for a rescaling of a
gridcoverage2D.
The user should be able to choose a resolution from a GUI.
What am I supposed to do if I want the rescaling with a fixed resolution for
example from 500m to 1000m. I need a generic solution.
At the moment I
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