Anssim, Petteri and others,
Thanks for you great feedback on this topic.
Cheers,
Derek
On 6/20/2012 5:26 AM, anssi wrote:
If you first rasterize your shapefile to the extent of your raster,
you can compute some basic stats and/or full histogram for your
polygons using Open Foris Geospatial Too
Dear Even,
many thanks for your prompt reply and the link. I found them both very helpful!
Cheers,
anssi
On Wed, Jun 20, 2012 at 4:00 PM, Even Rouault
wrote:
> Selon anssi :
>
>> Dear Joaquim,
>>
>> thanks for pointing that out.
>>
>> There´s absolutely no intention to abuse any of the great
Selon anssi :
> Dear Joaquim,
>
> thanks for pointing that out.
>
> There´s absolutely no intention to abuse any of the great work of the
> gdal/ogr developers. Rather the opposite.
>
> The license is being discussed as we speak and we're considering
> various options. What would you suggest? Sho
Hi,
On 19 June 2012 17:37, jdmorgan wrote:
> Is there a way to do something along the lines of zonal statistics with
> gdal. Basically, I have a county shape file and a classified raster
> dataset. I would like to count the number of raster pixels/county (FIPS).
> Is this possible with GDAL/O
No problem at all,
you had a good point.
Anyone here who knows these issues thoroughly and could provide some
recommendations?
Cheers,
Anssi
On Wed, Jun 20, 2012 at 3:20 PM, Joaquim Luis wrote:
> Anssi,
>
> OK, may I overreact a bit. It's just that I don't like GPL much, specially
> when it
Ciao,
keeping on the issues of the Subject:"zonal statistics with gdal", one month
ego i put on the web page
http://www.spatial-ecology.net/doku.php?id=wiki:geo_tools
a python script that calculate zonal statistics between two raster.
Is not so fast as the Anssi's OpenForis but i could coded by my
Anssi,
OK, may I overreact a bit. It's just that I don't like GPL much,
specially when it used on codes that rely on non GPLed codes. But this
thing of licensing issue is delicate (and boring), so you'll excuse me
if I don't give you one opinion on what you should. The most I can say
is that
Dear Joaquim,
thanks for pointing that out.
There´s absolutely no intention to abuse any of the great work of the
gdal/ogr developers. Rather the opposite.
The license is being discussed as we speak and we're considering
various options. What would you suggest? Should it be MIT or would ,
for ex
One other thing called my attention. If, as we can read on the wiki page
of OFGT
"... Most of the stand-alone programs use GDAL libraries and many of the
scripts rely heavily on GDAL command-line utilities."
than why the OFGT's licence is GPL?
I know MIT's license allows it, but it clearly l
Distributing software via dropbox is a rather unusual practice, you
might consider hosting it elsewhere...
Etienne
On Wed, Jun 20, 2012 at 6:53 AM, chenliang wang wrote:
> Hi, Anssi
>
> Cool ! Open Foris Geospatial Toolkit is a great geospatial library .
> Unfortunately, I can't download it from
Hi, Anssi
Cool ! Open Foris Geospatial Toolkit is a great geospatial library .
Unfortunately, I can't download it from dropbox site because ofInternet
censorship of China. Can u upload it to other site or send it for me? Thanks a
lot. I are a Linux and MINGW user .
Chen-Liang Wang
于 2012-6-
If you first rasterize your shapefile to the extent of your raster,
you can compute some basic stats and/or full histogram for your
polygons using Open Foris Geospatial Toolkit :
http://km.fao.org/OFwiki/index.php/Open_Foris_Toolkit
Installation instructions are under the "How to get it?" link.
Hi,
though be prepared that converting large images into shape is quite
slow. I would go opposite way: convert a shape to a raster [0, 1];
extract band from the image as another raster [2]; and then extract
statistics using Numpy [e.g. 3].
[0] http://stackoverflow.com/questions/2220749/raste
Derek,
Look at the http://starspan.projects.atlas.ca.gov project.
Petteri
On Tue, 19 Jun 2012, jdmorgan wrote:
Hello,
Is there a way to do something along the lines of zonal statistics with
gdal.Basically, I have a county shape file and a classified raster dataset.I
would like to count the
Hi,
you can use GDAL Python bindigs for this [0, 1]. The process may look
as open shape and raster, then convert pixel coordinates into map (shape)
coordinates and process only pixels inside your polygon.
[0] http://gdal.org/gdal_tutorial.html
[1] http://gdal.org/ogr/ogr_apitut.html
2012/6/19 jd
Hello,
Is there a way to do something along the lines of zonal statistics with
gdal.Basically, I have a county shape file and a classified raster
dataset.I would like to count the number of raster pixels/county
(FIPS).Is this possible with GDAL/OGR?If so can someone point me in the
right dire
That's interesting. This may explain why the --fid switch has no
effect. I wonder what the --fid switch is for, then.
Brent Fraser wrote:
Is the FID
supposed to be in the .dbf file that accompanies the .shp file?
I have examined this file, and I don't see an FID column (col
Is the FID
> supposed to be in the .dbf file that accompanies the .shp file?
> I have examined this file, and I don't see an FID column (column
> names are in the first row). In particular, since starspan2
> reports an FID of 0 for Zemmour, Mauritania, I would expect to
> see a column with t
Great question. I should have mentioned that I did so, and didn't see
anything weird. I zoomed way in, and it just looks like an unbroken
line. I did this with the Tiris Zemmour polygon selected, and again
with the Adrar polygon selected, hoping something would pop out. But,
it looks fine.
a) Is there some way to get a dump of FIDs with their corresponding
country/province names?
You could use dbfdump. I think it is delivered with FWTools.
Is the FID supposed to be in the .dbf file that accompanies the .shp
file? I have examined this file, and I don't s
> Hi,
>
> I performed the OpenJump procedure. But, I still get:
>
> Macintosh-4:starspan_tests gregederer$ starspan2 --progress --RID none
> --vector afadmn2n.shp --fid 3 --raster rfe_2006_04_pct.tif --stats
> results.txt avg --out-prefix bar --out-type table
> Number of features: 550
> starspan_
Hi,
I performed the OpenJump procedure. But, I still get:
Macintosh-4:starspan_tests gregederer$ starspan2 --progress --RID none
--vector afadmn2n.shp --fid 3 --raster rfe_2006_04_pct.tif --stats
results.txt avg --out-prefix bar --out-type table
Number of features: 550
starspan_csv: 1: E
Thanks, Brent. I'll give this a whirl.
Cheers,
Greg
Brent Fraser wrote:
Greg,
OpenJump is a good topology/geometry fixing tool. Load your
shapefile and do Tools->Generate->Buffer, set the Buffer distance to 0
to clean up the polygon vertices. I seem to recall it may have a
problem pres
Greg,
OpenJump is a good topology/geometry fixing tool. Load your shapefile and do
Tools->Generate->Buffer, set the Buffer distance to 0 to clean up the polygon
vertices. I seem to recall it may have a problem preserving attributes when the
results are saved as a shapefile, but you may be a
Brent,
My Google search didn't turn up much of use (most of the results were
PostGIS-specific). Do you know of a tool that would tell me which
feature(s) have problems? Do you know of a tool that might be able to
fix these polygons?
Thanks!
Greg
Brent Fraser wrote:
Greg,
It means the
Greg,
It means the GEOS topology library is having problems with geometry of your input
shapefile. Most likely related to duplicate vertices (or near-duplicate) in a polygon.
Do a Google for "side location conflict". It would be nice if it spat out the
FID of the offending polygon...
Bre
Hi Brent,
Thanks for the example. Here's what I got:
Macintosh-4:starspan_tests gregederer$ starspan2 --progress --RID none
--vector
/Users/gregederer/servers/geoserver_data/data/shapefiles/Admin/afadmn2n.shp
--raster rfe_2006_04_pct.tif --stats results.txt avg
starspan: --out-prefix: ?
T
Greg,
I've used StarSpan to do similar things; in my case I wanted "mode" not "avg".
Using v1.2.01 (I don't think I made major mods to the source):
starspan2.exe --progress --RID none --vector boundaries.shp --raster
big.tif --stats results.txt mode
I edited the resulting results.
Hello all,
I'm a GDAL newbie. I have a shape file containing subnational
boundaries for Africa. I have a raster containing rainfall for Africa.
I need to pull out the spatial average of rainfall for each of the
subnational units.
I think that I might be able to pull this off using StarSpa
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