[Qgis-user] Correlate xy points to heatmap bands

[Alex Mandel]

In the point sampling tool there's an option to include IDs. Go to the
Fields tab and make sure to include the original unique ID form the
point layer. Then use this ID to join the tables back together. Joining
by location is computationally expensive and error prone for points.

Course non of that should be necessary if you put all the raster layers
into the same Point Sampling run.

Thanks,
Alex

On 04/02/2014 02:08 PM, Thomas Endres wrote:
> The Point Sampling tool was the ticket - thank you.
> For the archives - found a good link here:
> <http://www.digital-geography.com/qgis-plugins-point-sampling-tool/>
> 
> My only issue now is when performing a 'Join attributes by location' to put
> it all together I consistently crash QGIS hard.
> But that is another thread....
> 
> Thanks again.
> 
> -tommy
> 
> 
> On Mon, Mar 31, 2014 at 10:58 AM, Alex Mandel <tech_dev at wildintellect.com>wrote:
> 
>> On 03/31/2014 08:38 AM, Thomas Endres wrote:
>>> Hi Everybody,
>>> I have a 5 band heatmap (a GeoTIFF created by the Heapmap plugin) for an
>>> area and a couple hundred xy points. I would like to correlate each of
>>> these points with 1 of the 5 band values in the heatmap - but am confused
>>> with how this works with a raster.
>>> Pointers appreciated!
>>>
>>> Thank You
>>> -tommy
>>
>>
>> Point Sampling tool in the Vector menu.
>>
>> By Correlate I assume you mean to put the raster values in the point
>> attribute table.
>>
>> -Alex
>>