the val_repl.py sample to convert a image to a numpy array(s)
> http://svn.osgeo.org/gdal/trunk/gdal/swig/python/samples/val_repl.py
>
> Numpy Stuff:
>
> http://www.scipy.org/Numpy_Example_List#head-7eb5ca476fca411db1db64bc024b7c0c94e42143
>
> Regards
>
>
> On 20
Hi All,
Is there any casting (for lack of a better word) needed when using
gdal_calc to take, e.g. a series of 16-bit images and perform float
functions against them?
Best,
Steve
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>
> Steve, there are more things I do not understand either. What is
> 'psData->scale'? Is it the grid cell size?
> So, if 'pafLocalMin' is on one of the 4 corners the distance is not cell
> size (let's call it DX) but instead sqrt(DX*DX + DX*DX).
> And what if data is in geogs? Than DX is clearly
Hmm. I don't follow? The revision would be this:
float GDALSlopeHydroAlg (float* afWin, float fDstNoDataValue, void* pData)
{
// Hydrologic Slope is the max
// local slope btw center cell and adjacent cells
const double radiansToDegrees = 180.0 / M_PI;
GDALSlopeAlgData* psData
Here's what I've settled on. Let me know your thoughts. The algorithm now
correctly calculates angle to lowest nearby point. If it's a local minima,
it instead calculates angle to the nearest high point, which will be a
negative number, so if the user wants to nullify these or use them in
additi
hould calculate the
> slope in the direction of hydrologic flow; i.e. the slope from the
> center cell to surrounding cell with the *minimum* elevation.
>
>
> - matt
>
> On Thu, Dec 15, 2011 at 10:29 AM, Stephen Mather
> wrote:
> > I already see a flaw-- the
Apologies for the flurry, one more change:
float GDALSlopeHydroAlg (float* afWin, float fDstNoDataValue, void* pData)
{
// Hydrologic Slope is the max
// local slope btw center cell and adjacent cells
const double radiansToDegrees = 180.0 / M_PI;
GDALSlopeAlgData* psData = (GDALS
;
}
On Thu, Dec 15, 2011 at 11:49 AM, Stephen Mather
wrote:
> Hi All,
> A colleague tipped me off to an article in Forestry Source entitled
> "When GIS Slope Isn't What You Think" showing differences between field
> measured slope values and GIS results. The di
9; k++)
{
if (afWin[k] > pafLocalMax)
{
pafLocalMax=afWin[k];
}
}
return pafLocalMax - afWin[4];
}
Any critques? Reasons to not add?
Best,
Steve
Stephen Mather
GIS Manager
Cleveland Metroparks
4101 Fulton Pkwy
Cleveland, OH
44144
___
I thought I'd tried that and it failed, but it looks to be just a problem of
stale statistics. Thanks Marius.
Steve
On Wed, Jul 27, 2011 at 10:16 PM, Marius Jigmond
wrote:
> On 07/27/2011 04:16 PM, Stephen Mather wrote:
>
> Hi All,
> I'm using gdal_translate (v
Hi All,
I'm using gdal_translate (version 1.6.3 on Ubuntu) with a scale factor
to stretch float values to 16-bit integer values. It works fine with tif
output, but with PNG it stretches the values to 8-bit:
gdal_translate -of PNG -scale 0 1550 0 65535 N2140615.txt N2140615.png
Is this a kno
>
> Hi all,
> I have a folder with a gdal2tiles output: 6 levels of zoom (and folders),
> with subfolders and the .png tiles.
>
> Is there a gdal tool to merge in a single geotiff file these .png tiles?
>
>
Hi Andrea,
Probably the simplest way to handle this is with a virtual dataset.
Rather
Seems large enough for me.
Stephen Mather
On Jan 1, 2011, at 5:47 AM, Even Rouault wrote:
>>
>> What's the new ceiling on image size for overview calculation?
>
> The same as before hopefully. I'm not sure what the limit is. From a quick
> look
> a
Seems to have done the trick, thanks Even.
What's the new ceiling on image size for overview calculation?
Steve
On Fri, Dec 31, 2010 at 11:38 AM, Even Rouault wrote:
> Stephen,
>
> this should be fixed now in SVN.
>
> This was indeed something wrong in a recent optimization in overview
> com
Hi All,
Testing out gdal 1.8; really excited by
http://www.gdal.org/gdallocationinfo.html. Below is a comparison of doing
the same process in 1.7.3 and then 1.8dev, released 2010/01/19
$ gdaladdo --version
GDAL 1.7.3, released 2010/11/10
$ gdalbuildvrt LEAP_Tree_Height_low_res_test.vrt *.png
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