Hi Nick,
> Thanks for the code, it's exactly what I need and I have my program working.
> I was just
> wondering when I'll be able to get my hands on the ZonalStatistics class
> through the geotools
> distribution? At the moment I have copied Simone's ZonalStatistics class
> source code
> verba
On 10 May 2011, at 23:04, Jody Garnett wrote:
> gt-coverage contains the idea; the implementation for different formats is
> handled as a plugins; so gt-geotiff contribtues the geotiff format.
> gt-arcgrid contribtues the arcgrid format.
>
> Details here:
> - http://docs.geotools.org/latest/us
gt-coverage contains the idea; the implementation for different formats is
handled as a plugins; so gt-geotiff contribtues the geotiff format. gt-arcgrid
contribtues the arcgrid format.
Details here:
- http://docs.geotools.org/latest/userguide/welcome/geotools.html
--
Jody Garnett
On Wednesda
On Tue, May 10, 2011 at 4:04 PM, Nicolas Malleson
wrote:
> I assume that the arcgrid module is part of gt-coverage? Or do I need to add
> an additional module?
It's in gt-coverage
Cheers
Andrea
--
---
Ing. Andrea Aime
GeoSolutions S.A.S.
Tec
On 10 May 2011, at 13:52, Andrea Aime wrote:
> On Tue, May 10, 2011 at 11:54 AM, Nicolas Malleson
> wrote:
>> Can I just check, if you do "GridFormatFinder.getAvailableFormats()" do you
>> also get an empty list?
>
> If I run that code from within the arcgrid module I get this:
>
> [org.geoto
On Tue, May 10, 2011 at 11:54 AM, Nicolas Malleson
wrote:
> Can I just check, if you do "GridFormatFinder.getAvailableFormats()" do you
> also get an empty list?
If I run that code from within the arcgrid module I get this:
[org.geotools.gce.arcgrid.ArcGridFormatFactory@1386000]
If instead I r
Hi Simone,
On 10 May 2011, at 10:23, Simone Giannecchini wrote:
> -1- makre sure this points to a fil that actually exists: File ascFile
> = new File("data/leeds_dtm/raster.asc.gz");
Don't worry, I checked that first :-)
> -2- make sure to provie a valid prj if your data is not in wgs84
The da
Ciao Nick,
two things:
-1- makre sure this points to a fil that actually exists: File ascFile
= new File("data/leeds_dtm/raster.asc.gz");
-2- make sure to provie a valid prj if your data is not in wgs84
Regards,
Simone Giannecchini
---
Ing. Simo
Hi Simone,
That's what I was doing originally (only tried zipping it because it was in
Jody's example) but the behaviour was the same.
Kind regards,
Nick
On 10 May 2011, at 09:56, Simone Giannecchini wrote:
> I would unzip the file before using it.
> Performances would be horrible anyway.
>
>
I would unzip the file before using it.
Performances would be horrible anyway.
Regards,
Simone Giannecchini
---
Ing. Simone Giannecchini
GeoSolutions S.A.S.
Founder
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fa
Thanks for all the help with the zonal statistics, I was amazed to wake up this
morning with 5 replies! I'll have a look at the jai tools that Michael and
Simone have recommended this afternoon, but in the meantime I'd just like to
ask about the behaviour of the GridFormatFinder (the behaviour o
Ciao A tutti,
aside from what jody just said for reading an asci grid, I just
committed these days the zonalstats operation wrapper from jai-tools
inside geotools.
This means that you should be able to get the relevant jars for
reading the ascigrid, and then computing statistics using the zonal
st
Hello Nick,
I see that Jody has already given some advice about reading the data
source and Andy has chipped in with some good points about vector /
raster issues.
GeoTools includes an unsupported module, gt-jai-tools, which wraps the
ZonalStats image operation from the JAI-tools project:
http:/
I did a quick test with the normal GridFormatFinder and it works to read
ArcGrid ASCII:
final File f = TestData.file(this, "ArcGrid.asc"); // Reading the coverage
through a file AbstractGridFormat format = GridFormatFinder.findFormat( f );
AbstractGridCoverage2DReader reader = format.getReader
There was a commit yesterday about ZonalStats; I would start with looking at
the test cases for it.
The ArcGrid plugin reads some kind of ascii format?
http://docs.geotools.org/latest/userguide/library/coverage/arcgrid.html
I have not hunted down an example yet; need to look in test cases; here
t any GeoTools implementations of this, but I'm
interested.
Cheers,
Andy
From: Nick Malleson [n.malleso...@leeds.ac.uk]
Sent: 09 May 2011 19:37
To: geotools-gt2-users@lists.sourceforge.net
Subject: [Geotools-gt2-users] Calculating zonal statistics for a grid
Hi,
I was wondering if anyone has some advice about calculating zonal statistics
from a raster file. Basically I have a raster DTM and a polygon shapefile
and I want to calculate, for each area in the shapefile, the average height
values of all pixels within that area. (Exactly the same thing that
17 matches
Mail list logo
