[Qgis-user] Vector to Raster Conversion, was :[Euclidean Distance grid creation problem]

[Alex Mandel]

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_dev at 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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