I ran your data, it worked fine for me. Yes initially it all looks 1
color. After going into the Properties. choosing to use Custom Min/Max
values, Selecting to Load from Actual, and stretching min/max. I can see
the data no problem.
I can see why sampling randomly with the info tool won't work, since you
need to click info exactly where a river line occurs.
http://www.pasteall.org/pic/52841
Thanks,
Alex
On 06/04/2013 01:37 PM, Alex Mandel wrote:
Ok, now we're getting somewhere. There error is specifically with the
GDAL rasterize tool (has no direct link to a euclidean distance tool).
Can you please post the GDAL command from the bottom box of that tool?
Thanks,
Alex
On 06/04/2013 01:14 PM, Falk Huettmann wrote:
thanks, re. Euclidean Distance problem,
we use the following point layer (shapefile attached) and with the GDAL
plugin.
We click on Raster, Rasterize (but get a grey canvas; all values in the
legend show the same. Using line data has the same effect).
We cannot proceed from that.
From there we wanted to get a Euclidean Distance and using Raster,
Analyse,
Distance.
We got stuck in this for over 3 weeks now (paper on Open Source GIS) and
wonder how to proceed next and for good
progress.
Thanks so much for any insights.
Very best from Alaska
F.
On Mon, Jun 3, 2013 at 9:21 PM, Alex Mandel
<tech_...@wildintellect.com>wrote:
On 06/03/2013 10:02 PM, Falk Huettmann wrote:
Dear all,
greetings;
we are still stuck with creating a Euclidean Distance grid in QGIS
based on point data (shapefile, projected in lat lon and with an ID
of 1).
I am aware of the steps shown online, but these create us just a grey
canvas.
(we tried different pixel and extent settings too)
We are grateful for any input (if not resolved, we will probably
move to
R
then and other options).
Thanks indeed for any input; more later
Falk Huettmann
Grey pixels do not mean no data. Did you check the values of random
pixels
with the Info tool?
Normally in the raster properties you have ask QGIS to calculate the
range
of values, and stretch min/max in order to actually see what you
expect, or
put in a custom color ramp.
Also what tutorial did you follow and which tool did you use to
calculate
the distance grid.
Thanks,
Alex
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